API 16A RAM BOP Blowout Preventers Selection Guide
RAM BOP Blowout Preventers are critical pressure control equipment for drilling, workover, well testing, well servicing and well intervention operations. When abnormal pressure, gas influx or uncontrolled flow risk appears, the rig crew needs a dependable barrier that can close the wellbore quickly and safely.
This guide explains how a ram type blowout preventer works, how different ram types compare, and how buyers can choose a suitable API 16A RAM BOP for land rigs, offshore drilling units, workover packages, wellhead upgrades and BOP stack replacement projects.
A surface BOP stack, workover BOP package or well intervention pressure control system must protect personnel, rigs, wellheads, production assets and nearby facilities. Therefore, the selected ram preventer must match the well program, pipe size, pressure rating, connection standard, control system and field conditions.
A ram type BOP uses two opposite ram blocks. These blocks move horizontally toward the center of the bore. When they close, they seal around drill pipe, tubing or casing. With the correct ram configuration, the equipment can also close an open bore or shear approved tubulars during emergency well control operations.
Because of this direct closing method, ram blowout preventers remain important safety barriers in oilfield well control systems. They support land drilling rigs, offshore drilling units, workover rigs, well servicing units, well testing packages, wellhead upgrade projects and BOP stack replacement programs.
SGPE supplies RAM BOP Blowout Preventers and related well control equipment for drilling contractors, oilfield service companies, workover operators and equipment replacement projects. Available support can include ram type selection, bore and pressure rating review, API 16A documentation, spare parts planning and quotation preparation based on project requirements.
What Is a RAM BOP?
A RAM BOP is a ram type blowout preventer that uses hydraulic ram blocks to close the wellbore. Each ram block carries sealing elements and moves from the side body toward the bore centerline. When the ram faces meet, the equipment creates a pressure barrier for well control.
An annular BOP uses a large circular packing element to close around different tubular sizes. A ram preventer works differently. It uses dedicated ram assemblies for specific functions, such as pipe sealing, variable bore sealing, blind sealing or shearing.
A complete surface BOP stack often combines annular BOPs and ram type blowout preventers. The annular preventer handles flexible closure around different tubulars, while the ram preventer provides defined barriers for pipe sealing, open-bore closure, emergency shut-in and shear ram well control.
Together, these components create a safer and more complete oilfield well control system.
Why Ram Type Blowout Preventers Matter
Oil and gas wells may encounter high-pressure formation fluids, gas kicks, lost circulation, shallow gas, wellbore instability or unexpected pressure changes. When the well starts to flow without control, the BOP stack becomes the primary surface pressure barrier.
A ram type blowout preventer helps the rig crew close the well around drill pipe, tubing or casing. It can also seal the bore when no pipe remains in the hole. In addition, it supports controlled circulation through the choke manifold and gives backup protection when other pressure control equipment cannot handle the condition.
The ram preventer works as part of a complete system. It connects with the wellhead, casing head, drilling spool, choke manifold, kill manifold, BOP control unit, hydraulic hoses, accumulator unit, test equipment and control panels.
However, the ram preventer itself still forms a key mechanical barrier. If it cannot close, lock or seal correctly, the complete well control system loses an important protection layer.
A reliable selection process should review bore size, working pressure, ram type, material class, temperature range, connection standard, hydraulic control volume, sealing parts, inspection records and spare parts support.
RAM BOP Buying Guide: Key Points Before Selection
A useful RAM BOP buying guide starts with the actual well control requirement, not only the product name. The same bore size may need different ram configurations, side outlets, locking systems or documentation levels.
Start with the wellhead and stack connection. The BOP must match the flange size, pressure rating, gasket type, bolt pattern and stack layout.
Then review the working pressure. A 5,000 psi unit cannot replace a 10,000 psi requirement unless the approved well control plan allows it.
The pipe program is another key factor. The supplier needs drill pipe, tubing or casing OD, wall thickness, grade and tool joint details, especially when the project requires blind shear rams.
Ram configuration should match the operation. A drilling rig may need pipe rams and blind shear rams. A workover unit may need tubing rams, variable bore rams and blind rams.
The document package also matters. Many oilfield buyers request API 16A documentation, test reports, material records, NDE reports, drawings, manuals and spare parts lists.
A clear buying process helps avoid wrong ram blocks, missing documents, control volume mismatch and installation problems at the rig site.
Main Types of RAM BOP Blowout Preventers
Different oilfield operations require different ram functions. Before choosing a ram type BOP, it helps to understand the main ram types and their applications.
Pipe Ram BOP
A pipe ram closes around a specific pipe outside diameter. It seals the annular space between the pipe and the BOP bore.
For example, a pipe ram may match 2-7/8 inch tubing, 3-1/2 inch drill pipe, 5 inch drill pipe or another oilfield tubular size.
Pipe rams work well when the pipe size remains stable during the operation. They provide reliable sealing because the ram profile matches the pipe body. However, they cannot seal correctly around the wrong pipe size.
For this reason, the exact drill pipe, tubing or casing OD must be confirmed before pipe rams are selected. A pipe ram BOP often appears in drilling, workover, tubing, well servicing and surface well control packages.
Variable Bore Ram BOP
A variable bore ram, also called a VBR, can seal around an approved pipe size range. This design gives the field crew more flexibility when the operation involves different tubular sizes.
For example, a variable bore ram may cover several drill pipe sizes or tubing sizes within its rated range. It can reduce ram changes during drilling, workover or intervention operations.
Every VBR has limits. The approved sealing range must be confirmed before use.
Variable bore ram BOPs suit land drilling rigs, offshore drilling units, workover packages, rental BOP fleets and oilfield service companies that handle multiple tubular programs.
Blind Ram BOP
A blind ram closes and seals the wellbore when no pipe remains in the hole. The two ram faces meet in the center of the bore and form a pressure-tight seal.
Blind rams do not cut drill pipe, tubing or casing. The crew should use them only when the bore is clear. If a tubular remains across the bore, a blind ram may suffer damage or fail to seal.
Blind ram BOPs often support tripping, pressure testing, wellhead work, workover operations and other procedures where open-bore closure may become necessary.
Blind Shear Ram BOP
A blind shear ram can cut approved tubulars and then help seal the bore. It combines shearing and blind sealing functions in one ram assembly.
When the crew activates the function under approved conditions, the shear blades cut the tubular. Then the ram faces continue closing to help seal the well.
Blind shear rams play an important role in emergency well control. However, their actual shearing capacity depends on pipe OD, wall thickness, pipe grade, tool joint position, well pressure, hydraulic pressure, blade design and equipment condition.
One blind shear ram cannot cut every drill pipe under every condition. The final selection must confirm the actual shearing requirement.
Casing Shear Ram
A casing shear ram cuts heavier oilfield tubulars, such as casing or large pipe, under specified conditions. It usually focuses on cutting rather than sealing.
Many high-specification BOP stack designs use a separate sealing ram together with the casing shear ram.
Casing shear rams appear more often in advanced drilling systems, offshore well control packages and high-risk well programs.
Special Rams
Some oilfield operations require special rams for stripping, hang-off, snubbing, coiled tubing, wireline tools or other intervention equipment.
These rams need careful engineering review. Their sealing surface, load capacity, operating method and service limits may differ from standard pipe rams.
When special rams are required, the RFQ should include tool OD, tubular data, connection details, pressure rating, operation mode and expected load conditions.
RAM BOP Selection Guide by Ram Type
The right ram type depends on the pipe program and the well control function. The table below gives a practical starting point for RAM BOP selection.
| Ram Type | Main Function | Typical Application | Key Selection Data |
|---|---|---|---|
| Pipe Ram | Seals around one fixed pipe OD | Drilling, workover, tubing operations | Pipe OD, pipe body size, ram cavity |
| Variable Bore Ram | Seals around an approved pipe OD range | Rigs with different drill pipe or tubing sizes | Approved OD range, pressure rating, seal type |
| Blind Ram | Seals open bore when no pipe is present | Tripping, pressure testing, wellhead work | Bore size, working pressure, open-bore seal |
| Blind Shear Ram | Cuts approved tubulars and helps seal the well | Emergency well control and critical BOP stacks | Pipe OD, wall thickness, grade, hydraulic pressure |
| Casing Shear Ram | Cuts heavier tubulars under specified conditions | High-specification drilling and offshore packages | Casing OD, wall thickness, grade, shear force |
| Special Ram | Supports special tools or intervention operations | Snubbing, coiled tubing, wireline, stripping or hang-off | Tool OD, load condition, service procedure |
This table does not replace engineering review. The final ram selection should match the BOP stack design, well pressure, pipe size, pipe grade, operating procedure and control system capacity.
Single Ram BOP and Double Ram BOP
Ram type blowout preventers are commonly supplied as single ram BOPs or double ram BOPs.
A double ram BOP has two ram cavities in one body. Each cavity can carry a different ram function. For example, the upper cavity may use pipe rams, while the lower cavity may use blind rams or blind shear rams.
Some BOP stacks also use multiple ram preventers. The final arrangement depends on well pressure, pipe program, drilling contractor standards, operator requirements and field safety rules.
| Configuration | Typical Ram Cavities | Common Use | Main Advantage |
| Single Ram BOP | 1 cavity | Workover, compact well servicing packages, simple stack designs | Compact structure and lower stack height |
| Double Ram BOP | 2 cavities | Land drilling rigs, offshore stacks, critical well control packages | More ram functions in one body |
| Multiple Ram Stack | 2 or more ram preventers | High-pressure drilling, complex well programs, replacement stacks | More barriers and flexible ram arrangement |
Common RAM BOP Sizes and Pressure Ratings
RAM BOP selection starts with bore size and working pressure. The bore size must match the wellhead, casing program and complete BOP stack design. The pressure rating must match the maximum expected surface pressure and the approved well control plan.
Common bore sizes include 7-1/16 inch, 9 inch, 11 inch, 13-5/8 inch, 16-3/4 inch, 18-3/4 inch, 20-3/4 inch and 21-1/4 inch.
Common working pressure ratings include 2,000 psi, 3,000 psi, 5,000 psi, 10,000 psi, 15,000 psi and special high-pressure configurations.
The following table gives general selection references. Final values depend on the approved technical data sheet, BOP stack design and project requirements.
| Common Bore Size | Common Pressure Rating | Typical Application Reference |
| 7-1/16 in. | 2,000 psi / 3,000 psi / 5,000 psi | Workover, well servicing, compact pressure control packages |
| 9 in. | 3,000 psi / 5,000 psi | Workover and medium-duty surface well control |
| 11 in. | 3,000 psi / 5,000 psi / 10,000 psi | Land drilling, workover, surface BOP stack replacement |
| 13-5/8 in. | 5,000 psi / 10,000 psi / 15,000 psi | Land drilling rigs, high-pressure drilling, BOP stack upgrades |
| 16-3/4 in. | 5,000 psi / 10,000 psi | Large bore surface stack and selected offshore applications |
| 18-3/4 in. | 10,000 psi / 15,000 psi | Offshore drilling units and high-specification well control systems |
| 20-3/4 in. | 3,000 psi / 5,000 psi | Large surface wellhead systems and special stack layouts |
| 21-1/4 in. | 2,000 psi / 3,000 psi | Large bore low-pressure drilling or workover applications |
A 7-1/16 inch RAM BOP may suit compact well servicing or workover operations. An 11 inch ram preventer often appears in land drilling and workover packages. A 13-5/8 inch 5M RAM BOP can serve many standard land drilling wells. A 13-5/8 inch 10M RAM BOP suits higher-pressure drilling programs.
Larger 18-3/4 inch and 20-3/4 inch ram preventers often support offshore drilling, high-specification surface stacks and large wellhead systems.
Bore size and pressure rating should not be selected from a general list only. The final review should include the wellhead connection, casing head, drilling spool, annular BOP, choke and kill outlets, stack layout, rig floor space and hydraulic closing capacity.
Common RAM BOP Models Buyers Often Request
Many buyers search for RAM BOP Blowout Preventers by size, pressure rating or ram configuration. These inquiry descriptions usually show stronger purchase intent than broad keywords such as “blowout preventer.”
Typical requests include 7-1/16 inch RAM BOP, 9 inch RAM BOP, 11 inch RAM BOP, 13-5/8 inch RAM BOP, 13-5/8 inch 5M RAM BOP, 13-5/8 inch 10M RAM BOP, 16-3/4 inch RAM BOP, 18-3/4 inch RAM BOP, 18-3/4 inch 10K RAM BOP, 18-3/4 inch 15K RAM BOP, 20-3/4 inch RAM BOP and 21-1/4 inch RAM BOP.
Buyers may also describe the equipment by function, such as single ram BOP for workover rig, double ram BOP for drilling rig, API 16A RAM BOP, hydraulic ram BOP, blind shear ram BOP for well control, variable bore ram BOP for drill pipe, pipe ram BOP for drilling rig, RAM BOP spare parts, RAM BOP replacement parts or surface BOP stack ram preventer.
A buyer using these terms often already knows the required equipment type and may need a quotation, drawing, technical data sheet or spare parts list.
For this reason, a strong product page should mention bore size, working pressure, ram configuration, connection type, ram size range, documentation and replacement compatibility.
Reference Technical Parameters for RAM BOP Selection
The following reference parameters help buyers prepare a clearer RFQ. Final technical values must follow the approved data sheet, manufacturer design and project specification.
| Parameter | Common Reference Options | Selection Notes |
| Bore Size | 7-1/16 in. to 21-1/4 in. | Match wellhead, casing program and BOP stack design |
| Working Pressure | 2,000 psi to 15,000 psi, special higher ratings by design | Match maximum expected surface pressure and well control plan |
| Ram Configuration | Pipe ram, VBR, blind ram, blind shear ram, casing shear ram | Select according to pipe program and emergency functions |
| End Connection | API flange, hub connection or project-specific interface | Match wellhead, drilling spool and existing stack |
| Side Outlets | Commonly arranged for choke and kill connections | Confirm size, pressure rating and orientation |
| Locking System | Manual lock, hydraulic lock or design-specific lock | Confirm operating philosophy and site requirement |
| Operating Medium | Hydraulic fluid from BOP control unit | Confirm operating pressure and control volume |
| Service Environment | Standard, offshore, low-temperature or sour service | Confirm material class, elastomer and NACE requirement |
| Documentation | COC, MTC, hydro test, NDE, GA drawing, manual, ITP | Confirm project document list before order |
| Spare Parts | Ram packers, top seals, side seals, bonnet seals, ram assemblies | Prepare according to operating frequency and maintenance plan |
API 16A RAM BOP Requirements
Many oilfield buyers request API 16A RAM BOP equipment because API 16A applies to drill-through well control equipment, including blowout preventers, drilling spools and related pressure control equipment.
For ram type blowout preventers, API 16A-related requirements may involve design, materials, pressure testing, quality control, documentation, marking and traceability.
In real procurement work, clients may also request PSL level, PR level, material class, temperature class, NACE sour service compatibility and third-party inspection.
| Document / Record | Purpose |
| Certificate of Conformity | Confirms product supply scope and conformity statement |
| Mill Test Certificate | Shows material heat number, chemical composition and mechanical properties |
| Hydrostatic Test Report | Confirms pressure test result according to approved procedure |
| Dimensional Inspection Report | Confirms main interface dimensions and critical tolerances |
| NDE Report | Records UT, MT, PT or other non-destructive examination results |
| Assembly Test Record | Confirms assembly and functional test results |
| General Arrangement Drawing | Shows main dimensions, connections, side outlets and stack interface |
| Operation and Maintenance Manual | Guides installation, operation, maintenance and storage |
| Spare Parts List | Helps buyer prepare maintenance and emergency replacement parts |
| ITP or Quality Plan | Defines inspection stages, hold points and witness requirements |
Some projects also require witness inspection, functional testing, low-temperature material review, offshore coating, customer-specific ITP documents or customized documentation packages.
For BOP replacement projects, buyers need to confirm whether the new ram preventer must match an existing stack. Interface dimensions, flange connection, side outlet position, hydraulic port location and ram operating volume all matter.
Key Components of a Ram Type Blowout Preventer
A ram blowout preventer contains several critical parts. Each part affects sealing performance, closing reliability and service life in oilfield conditions.
| Component | Function | Selection or Maintenance Note |
| Body | Carries pressure and supports ram cavities | Match pressure rating, bore size and material requirement |
| Bonnet | Provides access to ram assemblies | Check bonnet seals, bolts and opening method |
| Ram Assembly | Performs pipe sealing, blind sealing or shearing | Match ram type, pipe size and service condition |
| Ram Shaft | Transfers piston force to ram blocks | Inspect sealing surface and movement condition |
| Piston | Drives ram movement through hydraulic pressure | Confirm operating pressure and seal condition |
| Ram Packer | Provides primary sealing around pipe or bore | Select elastomer according to mud, gas and temperature |
| Top Seal / Side Seal | Helps complete the pressure seal | Replace according to inspection and maintenance schedule |
| Locking System | Holds rams closed after activation | Confirm manual or hydraulic lock requirement |
| Side Outlets | Connect choke and kill lines when required | Confirm outlet size, orientation and pressure rating |
The body carries wellbore pressure and supports the ram cavities. Material selection depends on pressure rating, temperature class, well fluid condition and service environment.
The bonnet provides access to the ram assembly. Field crews open it for ram replacement, seal inspection and maintenance. Some designs use manual locks, hydraulic locks or other locking systems according to project requirements.
The ram assembly performs the actual pipe sealing, blind sealing or shearing function. It includes the ram block and elastomeric sealing elements. These parts must match the oilfield operation and tubular size.
Sealing parts include ram packers, top seals, side seals, bonnet seals and other elastomeric components. Their material must suit drilling mud, completion fluid, crude oil, gas, H2S, CO2, temperature and pressure conditions.
How a RAM BOP Works During Well Control
During normal drilling, workover or well servicing, the RAM BOP remains open. Drill pipe, tubing, casing or service tools can pass through the bore.
The BOP control unit keeps hydraulic pressure ready in the accumulator system. When the rig crew needs to close the ram preventer, they activate the correct function from the control panel.
Hydraulic pressure flows through control lines to the closing chamber. The pistons move first. Then the ram shafts push the ram blocks inward. Finally, the sealing surfaces close around pipe or across the bore.
If the equipment closes around pipe, the pipe ram or variable bore ram seals the annular space. The crew can then circulate through the choke manifold, monitor pressure and follow the approved well control procedure.
If no pipe remains in the hole, blind rams can seal the open bore.
If an emergency requires shearing, the blind shear ram may cut the approved tubular and seal the well. This result depends on confirmed shearing capacity and actual field conditions.
After the well returns to a safe condition, the crew can open the rams by applying hydraulic pressure to the opening chamber. The pistons retract, and the ram blocks move back into the body.
Regular function tests, pressure tests, seal inspections and control system checks help keep the equipment ready for field use.
Oilfield Applications of RAM BOP Blowout Preventers
RAM BOP Blowout Preventers support many pressure control applications in the oil and gas industry. Each application has different technical requirements.
| Application | Common RAM BOP Requirement | Buyer Focus |
| Land Drilling Rig | 11 in. or 13-5/8 in. ram preventer, 5M or 10M rating | Pressure rating, ram size, delivery and stack compatibility |
| Offshore Drilling Unit | Large bore, high-pressure ram BOP with complete records | Documentation, inspection, coating and spare parts |
| Workover Rig | Compact single ram or double ram BOP | Tubing size, fast ram change and maintenance |
| Well Servicing | 7-1/16 in. or 9 in. compact ram preventer | Simple operation and reliable sealing |
| Well Testing / Flowback | Ram BOP with wellhead and flowline equipment | Pressure isolation and flow control |
| Snubbing / Coiled Tubing | Special ram arrangement | Tool OD, live well pressure and intervention procedure |
| BOP Replacement | Interchangeable ram preventer | Stack height, flange, side outlet and hydraulic port position |
| Wellhead Upgrade | Higher pressure ram BOP package | Complete pressure path and system compatibility |
Land drilling rigs commonly use ram preventers in surface BOP stacks. These stacks may include annular BOPs, single ram BOPs, double ram BOPs, drilling spools, choke line valves and kill line valves.
Offshore drilling requires high reliability, complete documentation and strict inspection. Offshore BOP systems may need advanced ram functions, higher pressure ratings, larger bore sizes and more complete test records.
Workover rigs use ram blowout preventers to control wells during repair, stimulation, tubing replacement, recompletion and intervention work. These applications often involve tubing rams, variable bore rams and compact BOP stack designs.
For BOP stack replacement projects, dimensional compatibility becomes as important as pressure rating. The new equipment must match the current stack height, flange type, bolt pattern, side outlet orientation and hydraulic connection layout.
How to Choose the Right RAM BOP
Choosing the right ram preventer requires a clear technical review. A good selection process helps avoid installation problems, wrong ram blocks, seal failures and project delays.
Confirm the Wellhead and Stack Interface
Start with the wellhead size, flange standard, pressure rating and connection type. The ram BOP must connect safely to the wellhead, drilling spool or other stack components.
For replacement projects, existing drawings are helpful. If drawings are not available, clear photos and key dimensions can still support compatibility review.
Define the Bore Size
The bore size must allow the planned tools and tubulars to pass through. It must also match the wellhead and other BOP stack components.
Confirm Working Pressure
The working pressure must meet the well program and maximum expected surface pressure. A 5,000 psi ram BOP cannot replace a 10,000 psi requirement unless the approved well control plan allows it.
Select the Ram Types
The pipe program determines the ram arrangement. The RFQ should list every pipe size and operation mode, so the supplier can review pipe rams, variable bore rams, blind rams, blind shear rams or special rams.
For shear rams, pipe OD, wall thickness, grade, tool joint information and expected shearing conditions are essential.
Review Temperature and Service Conditions
High temperature, low temperature, sour gas, drilling mud chemistry and offshore exposure can affect seal material and metallic material selection.
If the well contains H2S or CO2, the RFQ should clearly state sour service and NACE requirements.
Check the Control System
The BOP control unit must provide enough hydraulic pressure and fluid volume to close and open the ram preventer.
Closing volume, opening volume and operating pressure should match the accumulator unit and control panel.
Confirm Documentation
Oilfield projects often require certificates, test reports, inspection records and drawings. Document requirements should be listed before order confirmation.
Plan Spare Parts
A ram BOP needs spare ram packers, top seals, bonnet seals, seal kits, ram blocks, hydraulic seals and maintenance tools.
A suitable spare parts plan reduces downtime during drilling, workover and well servicing operations.
RAM BOP Selection Guide for Different Projects
Different projects need different selection priorities. The following guide helps buyers prepare a more accurate RFQ.
For Land Drilling Rigs
Focus on bore size, working pressure, pipe ram size, blind shear ram requirement, side outlet arrangement, stack height and compatibility with the existing wellhead.
Common project requests include 11 inch RAM BOP, 13-5/8 inch 5M RAM BOP, 13-5/8 inch 10M RAM BOP, double ram BOP for drilling rig and API 16A RAM BOP for land rig well control.
For Workover Rigs
Focus on compact stack design, tubing size, fast ram change, easy maintenance and spare parts availability.
Common configurations include tubing rams, variable bore rams, blind rams and compact single ram or double ram BOP packages.
For Offshore Drilling Units
Focus on API 16A documentation, inspection records, coating system, stack weight, stack height, hydraulic control response and long-term spare parts support.
Offshore projects may also need higher pressure ratings, larger bore sizes and stricter documentation packages.
For BOP Replacement Projects
Focus on interchangeability. The RFQ should include the existing BOP brand, model, nameplate photo, flange size, pressure rating, overall height, side outlet position and hydraulic port details.
A replacement BOP must match the current stack, not only the pressure rating.
For Wellhead Upgrade Projects
Focus on the complete pressure path. The ram preventer must match the upgraded wellhead, drilling spool, valves, choke manifold, kill manifold, studs, ring gaskets, control unit and test equipment.
If the project upgrades from 5,000 psi to 10,000 psi, every pressure-containing part needs review.
Common Mistakes When Buying RAM BOP Blowout Preventers
Many purchasing problems come from incomplete technical information. The product name alone does not define the correct equipment.
One common mistake involves ram size. Some RFQs request a ram BOP without listing the pipe sizes. As a result, the supplier cannot select the correct pipe rams or variable bore rams.
Another mistake involves shearing capacity. A blind shear ram request should include pipe grade, wall thickness and tool joint data. Without this information, the supplier cannot confirm whether the shear ram can cut the required tubular.
Connection compatibility also matters. The pressure rating may match, but the flange standard, side outlet orientation or stack height may not fit the existing oilfield equipment.
Control volume is another common issue. If the BOP control unit cannot supply enough hydraulic volume, the ram preventer may not close as expected.
Documentation should be discussed early. Projects that need third-party inspection, customer ITP, NACE records or special test reports may require longer preparation time.
A complete RFQ package helps reduce these risks before order confirmation.
Maintenance and Inspection Tips for RAM BOPs
A ram BOP must remain ready for emergency oilfield use. Regular maintenance keeps the equipment reliable and extends service life.
Operators should inspect sealing parts after each operation or according to the maintenance schedule. Ram packers, top seals and side seals need special attention because cuts, hardening, swelling or deformation can affect pressure sealing.
The crew should also check bonnet seals, hydraulic seals, ram shafts and locking mechanisms. If the ram movement becomes slow, uneven or abnormal, the team should investigate before the next operation.
Function testing confirms that the equipment opens and closes correctly. Pressure testing confirms that it can hold the required pressure.
Both tests should follow the approved site procedure and applicable oilfield standards.
Storage also matters. Rubber parts should stay away from direct sunlight, high heat, oil contamination and ozone exposure. Metal parts should receive corrosion protection during long storage.
For harsh oilfield environments, such as offshore platforms, desert drilling sites or cold-region well sites, the maintenance plan should consider salt spray, sand, dust, low temperature and humidity.
Good maintenance improves safety, reduces non-productive time and supports customer confidence during audits or inspections.
RAM BOP Spare Parts Buyers Should Consider
When purchasing RAM BOP Blowout Preventers, spare parts should be reviewed at the same time.
A low-cost BOP without available spare parts can create serious downtime in oilfield operations.
Common spare parts include pipe ram assemblies, variable bore ram assemblies, blind ram assemblies, blind shear ram assemblies, casing shear ram assemblies, ram packers, top seals, side seals, bonnet seals, piston seals, hydraulic seal kits, lock screw parts, ram shaft components, bonnet bolts and nuts, operating tools and test tools.
| Spare Part | Main Function | Suggested Preparation |
| Pipe Ram Assembly | Seals around fixed pipe OD | Prepare according to pipe program |
| Variable Bore Ram Assembly | Seals around approved OD range | Prepare for mixed pipe programs |
| Blind Ram Assembly | Seals open bore | Prepare for pressure testing and emergency closure |
| Blind Shear Ram Assembly | Cuts approved tubulars and helps seal | Confirm pipe size, grade and shear requirement |
| Ram Packer | Provides main ram sealing | Keep routine replacement stock |
| Top Seal / Side Seal | Completes pressure sealing | Replace during inspection or overhaul |
| Bonnet Seal | Seals bonnet connection | Prepare for maintenance opening |
| Hydraulic Seal Kit | Supports piston and hydraulic operation | Prepare for scheduled maintenance |
| Lock Screw Parts | Support manual locking function | Prepare for manual lock designs |
| Test Tools | Support pressure and function testing | Select according to test procedure |
For long-term field operation, buyers may request a one-year or two-year recommended spare parts package.
Drilling contractors, workover companies and oilfield service companies may also keep ram blocks for different pipe sizes in stock.
If the ram BOP replaces an existing unit, old spare parts may not fit the new equipment. Similar names and similar sizes do not always mean full interchangeability.
RAM BOP vs Annular BOP
A ram BOP and an annular BOP both help control oilfield well pressure, but they work differently.
A ram BOP uses specific ram blocks. It provides stronger function-based sealing for pipe, open bore or shearing applications.
| Item | RAM BOP | Annular BOP |
| Main Sealing Method | Ram blocks | Annular packing element |
| Pipe Size Flexibility | Depends on ram type | Higher flexibility |
| Common Functions | Pipe sealing, blind sealing, shearing | Flexible closure around pipe or tools |
| Typical Position in Stack | Below annular BOP in many surface stacks | Often above ram preventers |
| Main Advantage | Strong function-specific barrier | Flexible closure for different tubulars |
In many surface BOP stacks, the annular preventer sits above the ram preventers. The annular BOP handles flexible closure, while the ram type preventer provides defined pressure barriers and emergency functions.
The best oilfield BOP stack design does not choose one instead of the other. It combines both according to the well control plan.
RAM BOP Selection Checklist for RFQ
To receive an accurate quotation, buyers should provide clear information.
| RFQ Item | Information to Provide |
| Product Type | Single ram BOP, double ram BOP or complete BOP stack |
| Bore Size | 7-1/16 in., 11 in., 13-5/8 in., 18-3/4 in. or other size |
| Working Pressure | 3,000 psi, 5,000 psi, 10,000 psi, 15,000 psi or project requirement |
| Connection Standard | API flange, hub connection or special interface |
| Ram Type | Pipe ram, VBR, blind ram, blind shear ram, casing shear ram or special ram |
| Pipe Data | Drill pipe, tubing or casing OD, wall thickness and grade |
| Temperature Range | Ambient and operating temperature |
| Service Environment | Standard, offshore, low-temperature or sour service |
| Material Requirement | Material class, NACE requirement or special material |
| Control System | Hydraulic operating pressure, closing volume and control interface |
| Side Outlets | Size, pressure rating and orientation |
| Locking System | Manual lock, hydraulic lock or project-specific design |
| Documents | Certificates, test reports, drawings, ITP, MTC and manuals |
| Spare Parts | Ram assemblies, ram packers, seals and hydraulic kits |
| Quantity and Delivery | Required units, shipping destination and delivery schedule |
With this information, the supplier can review technical compatibility, select suitable ram assemblies and prepare a more accurate offer.
How SGPE Supports RAM BOP Projects
SGPE supports RAM BOP Blowout Preventer projects from early technical review to quotation preparation. For new drilling packages, the review usually starts with bore size, working pressure, ram type, connection standard and BOP stack layout.
For replacement projects, SGPE can review existing nameplate photos, flange dimensions, stack height, side outlet orientation and hydraulic port details. This helps reduce the risk of receiving a ram preventer that meets the pressure rating but does not fit the existing stack.
For workover and well servicing packages, SGPE can help match tubing rams, variable bore rams, blind rams and compact ram BOP configurations according to the operation program.
For drilling rig and offshore projects, SGPE can support document requirements such as certificates, material records, hydrostatic test reports, dimensional inspection records, NDE reports, general arrangement drawings, operation manuals and recommended spare parts lists.
SGPE can also supply RAM BOP spare parts, including ram assemblies, ram packers, top seals, side seals, bonnet seals, hydraulic seal kits and related maintenance parts according to the selected equipment configuration.
Why Buyers Need a Reliable RAM BOP Supplier
A ram BOP is safety-critical well control equipment, not a simple oilfield commodity item.
A reliable supplier should understand pressure control, API 16A equipment, BOP stack layout, ram selection, spare parts and project documentation.
A strong RAM BOP supplier can help buyers review whether the selected equipment matches the wellhead, whether the ram type suits the pipe program, whether the control unit can operate the BOP and whether the side outlets match the choke and kill system.
The supplier should also confirm whether the documentation package meets project requirements and whether spare parts can support long-term operation.
For international oilfield buyers, communication also matters. The supplier should respond clearly, confirm technical details, provide drawings when appropriate and explain limitations before production.
This approach helps reduce misunderstanding and avoids the common problem of receiving equipment that looks correct but cannot fit the rig.
Safety and Performance Depend on the Complete System
A ram BOP can only perform well when the complete well control system supports it.
Even a high-quality BOP may fail to deliver the expected result if the control unit lacks hydraulic capacity, the ram type does not match the pipe or the seals cannot handle the service condition.
Therefore, engineers should review the full pressure path from the wellhead to the BOP stack and from the BOP stack to the choke manifold.
They should also confirm the closing sequence, hydraulic control logic, testing procedure and emergency response plan.
Good equipment selection, proper installation, trained crews and regular testing work together.
No single product can replace a complete oilfield well control strategy.
Frequently Asked Questions About API 16A RAM BOP Blowout Preventers
1. What is a RAM BOP used for in oilfield well control?
A RAM BOP closes the wellbore during oilfield drilling, workover, well testing, well servicing and well intervention operations. It helps the rig crew control abnormal pressure, gas influx, formation fluid flow and other well control risks.
Depending on the ram configuration, the equipment can seal around drill pipe, tubing or casing. It can also close an open bore when no pipe remains in the hole. In emergency conditions, a blind shear ram BOP can cut approved tubulars and help seal the well.
Oilfield operators usually install these blowout preventers in surface BOP stacks, workover BOP packages, well testing pressure control systems and BOP replacement projects.
2. How does a RAM BOP work?
A RAM BOP uses hydraulic pressure to move two opposite ram blocks toward the center of the bore. When the rams close, they create a pressure barrier around the pipe or across the open bore.
The BOP control unit sends hydraulic fluid to the closing chamber. Then the pistons push the ram shafts and ram blocks inward. Pipe rams or variable bore rams seal around tubulars. Blind rams close the empty bore. Blind shear rams cut approved pipe before helping seal the well.
After the well returns to a safe condition, the crew can open the ram preventer through the control system. Regular function tests, pressure tests and seal inspections help keep this process reliable.
3. What is the difference between a RAM BOP and an annular BOP?
A RAM BOP uses ram blocks to perform specific well control functions, such as pipe sealing, variable bore sealing, blind sealing and shearing.
Most surface BOP stacks use both types together. The annular BOP usually provides flexible closure, while the ram preventer provides defined barriers for pipe rams, blind rams, blind shear rams and other emergency well control functions.
4. What are the main types of RAM BOP rams?
The main ram types include pipe rams, variable bore rams, blind rams, blind shear rams, casing shear rams and special rams.
Pipe rams close around one specific pipe OD. Variable bore rams seal around an approved pipe size range. Blind rams close the bore when no pipe remains in the hole. Blind shear rams cut approved tubulars and then help seal the well. Casing shear rams cut heavier tubulars under specified conditions.
Special rams may support snubbing, coiled tubing, wireline, stripping, hang-off or other well intervention applications.
5. How do I choose between pipe rams and variable bore rams?
Choose pipe rams when the operation uses one fixed drill pipe, tubing or casing size. A pipe ram matches a specific pipe OD, so it can provide reliable sealing when the tubular size remains stable.
Choose variable bore rams when the operation may involve different pipe sizes. A variable bore ram, also called a VBR, can seal around an approved OD range. This feature helps drilling rigs, workover units, rental BOP fleets and service companies handle different tubular programs.
Before selecting either option, confirm the pipe OD, wall thickness, connection type, operating pressure and approved ram size range.
6. What is the difference between blind rams and blind shear rams?
Blind rams close and seal the bore only when no pipe remains in the hole. They do not cut drill pipe, tubing or casing.
Blind shear rams can cut approved tubulars and then help seal the wellbore. They support emergency well control when pipe remains across the BOP and the crew needs to shut in the well.
The two ram types serve different purposes. A blind shear ram requirement should not be replaced with a standard blind ram.
7. Can a blind shear ram cut all drill pipe?
No. A blind shear ram cannot cut every drill pipe under every condition. Its shearing capacity depends on pipe OD, wall thickness, pipe grade, tool joint position, well pressure, hydraulic pressure, blade design and equipment condition.
A shear ram that can cut one drill pipe size may not cut a heavier grade or thicker wall pipe. It may also fail if the tool joint sits in the shear area.
Before ordering a blind shear ram BOP, provide the drill pipe size, pipe grade, wall thickness, tool joint details and maximum expected well pressure.
8. What RAM BOP sizes and pressure ratings do buyers commonly request?
Common bore sizes include 7-1/16 inch, 9 inch, 11 inch, 13-5/8 inch, 16-3/4 inch, 18-3/4 inch, 20-3/4 inch and 21-1/4 inch.
Common working pressure ratings include 2,000 psi, 3,000 psi, 5,000 psi, 10,000 psi and 15,000 psi. Some high-pressure well control systems may require special pressure configurations.
Many buyers request 7-1/16 inch RAM BOP for workover service, 11 inch RAM BOP for land drilling packages, 13-5/8 inch 5M RAM BOP for standard drilling wells, 13-5/8 inch 10M RAM BOP for higher-pressure applications and 18-3/4 inch RAM BOP for offshore or high-specification surface BOP stacks.
9. What does API 16A mean for a RAM BOP?
API 16A covers drill-through well control equipment, including blowout preventers and drilling spools. When buyers request an API 16A RAM BOP, they usually expect the equipment to meet recognized oilfield requirements for design, materials, pressure testing, quality control, marking and documentation.
In procurement work, buyers may also specify PSL level, PR level, material class, temperature class, NACE sour service, third-party inspection and project-specific ITP documents.
A typical API 16A document package may include certificate of conformity, mill test certificate, hydrostatic test report, dimensional inspection report, NDE report, material traceability record, operation manual, general arrangement drawing and spare parts list.
10. Can SGPE support RAM BOP replacement projects?
Yes. SGPE can review replacement RAM BOP requirements based on the existing BOP model, nameplate photo, flange size, pressure rating, stack height, side outlet position and hydraulic port details.
For replacement projects, dimensional compatibility is as important as pressure rating. A new ram preventer should match the existing wellhead, drilling spool, control system and stack layout.
Clear photos, drawings or previous technical data sheets help SGPE review the replacement scope and prepare a more suitable quotation.
11. What spare parts should buyers prepare for RAM BOP maintenance?
Buyers should prepare spare parts according to ram type, operating frequency, well condition and maintenance plan. Common spare parts include pipe ram assemblies, variable bore ram assemblies, blind ram assemblies, blind shear ram assemblies, casing shear ram assemblies, ram packers, top seals, side seals, bonnet seals, piston seals, hydraulic seal kits, lock screw parts and ram shaft components.
For drilling contractors, workover companies and rental BOP fleets, a one-year or two-year spare parts package can reduce downtime and support scheduled maintenance.
If the project involves a BOP replacement, old spare parts should not be assumed to fit the new equipment.
12. What information should buyers provide for a RAM BOP quotation?
A complete RAM BOP RFQ should include product type, bore size, working pressure, connection standard, ram configuration, pipe size, pipe grade, service environment, temperature range, side outlet requirements, hydraulic control details, documentation requirements, spare parts requirements and quantity.
For example, one buyer may request a 13-5/8 inch 10M double ram BOP with pipe rams and blind shear rams for a drilling rig. Another buyer may need a 7-1/16 inch RAM BOP for workover operations with tubing rams and blind rams.
For replacement projects, send the existing BOP brand, model, photos, drawings or main dimensions. Clear technical information helps SGPE select the correct RAM BOP Blowout Preventer, confirm ram compatibility and prepare a more accurate quotation.
Request a RAM BOP Blowout Preventer Quotation
SGPE supplies RAM BOP Blowout Preventers for oilfield drilling, workover, well testing, well servicing and well intervention applications.
Available options include single ram BOPs, double ram BOPs, pipe ram BOPs, variable bore ram BOPs, blind ram BOPs, blind shear ram BOPs, casing shear ram BOPs, special rams and ram BOP spare parts.
SGPE can support common inquiry requirements such as 7-1/16 inch ram BOP, 9 inch ram BOP, 11 inch ram BOP, 13-5/8 inch 5M ram BOP, 13-5/8 inch 10M ram BOP, 18-3/4 inch ram BOP, API 16A ram BOP, double ram BOP and blind shear ram BOP packages.
For replacement projects, please provide photos of the existing BOP nameplate, stack layout, flange connection, side outlets and hydraulic ports. If available, send drawings or previous technical data sheets. A clear RFQ helps shorten the selection process, reduce technical risk and support a safer oilfield well control system.
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