Ram Bops

Ram type BOPs are the most common type of blow out preventers. This section looks at three common types in use: Shaffer 'SL', Cameron 'U' and Hydril 'V'.

1.2.1 Closing Times

  • API RP53 requirements state that surface rams must close within 30 seconds.
  • Subsea rams must close within 45 seconds.

CAMERON 'U' BOP

The Cameron 'U' BOP is a ram type preventer designed for both land and subsea operations.

Cameron Preventer

U' Blowout Preventer

Features:

  • U BOP rams are pressure energising. Wellbore pressure acts on the ram to increase the sealing force and to maintain the seal in the event of hydraulic pressure loss.
  • The Ram bonnets are opened and closed using hydraulic pressure.
  • Large bore shear bonnets are available for U type BOPs. These effectively increase the closing area by 35%.
  • A large manual locking screw facilitates locking and closing of the BOP if required.
  • Wedgelock system available for subsea operations. Theses require a separate function to be deployed in order to lock the rams.

U BOP - OPERATION

The 'U' BOP is operated using a typical accumulator system with 1500 psi. Hydraulic fluid is directed through open and close lines which connect to the body of the BOP. As hydraulic fluid is displaced into the closing chamber of the BOP the piston moves inward pushing the ram into the well bore.

Ram Change-out

The Ram closing pressure also opens the bonnets for ram change. When the bonnet bolts are unscrewed and closing pressure is applied, pressure pushes the ram inward and at the same time moves the bonnet away from the preventer body. An eyebolt on each end of the preventer body can be screwed into the top of each ram for lifting. Ram opening pressure also closes the bonnets. Hydraulic control pressure draws the bonnets tightly against the preventer body; bonnet bolts hold the bonnets closed. An important feature of the hydraulic system is that the rams are pulled back close to the bonnets before the bonnets begin moving toward the preventer body.

Hydraulic Position Control System

Hydraulic Control System of 'U' Preventers

Ram closing and Bonnet opening pressure (Red) Ram opening and Bonnet closing pressure (Blue)

'U' BOP COMPONENTS

Hydraulic Pressure Seals

SECONDARY SEAL

All ram type blow out preventers mentioned in this section incorporate a weephole and secondary sealing mechanism between the operating chamber and the interior of the BOP. The function of the weephole is to isolate wellbore pressure from the pressure in the operating cylinder. Should leakage occur in either the wellbore or operating chamber the weephole will provide a vent to atmosphere. If mud is observed coming from the weephole this would suggest that the piston rod mud seal requires replacing. If hydraulic fluid is observed leaking from the weephole this would imply that the seal between the bonnet and piston rod is leaking. Both situations would require drilling operations to be stopped and the leaking or damaged seals to be replaced. However, if leakage occurs during a well control operation, a secondary seal can be energised by pumping high pressure plastic packing through the check valve provided. Some BOPs provide an initial plug of plastic packing in the chamber for this situation. A secondary seal is only useful while the ram shaft remains in the same position. When the well control operation is complete, the BOP should be stripped and the leaks repaired.

Bop Top Ram Seal AssemblyCameron Fixed Ram Hang Off Position
Figure 8 - Cameron Ram Preventer - Type 'U': Type 'U' Secondary Seal

As shown above, the secondary seal on the connecting rod differs from that on the 'QRC' preventer. On the type 'U', plastic packing is forced into an exterior groove around a doughnut-shaped plastic packing ring. As more plastic is forced into this groove by screwing the piston in, the force is transmitted to the bottom of the groove which effects a seal around the connecting rod, and to the sides of the groove which creates a seal against the body of the preventer.

There is no relief mechanism to maintain the correct plastic packing pressure. For this reason, care should be taken to screw the piston in just far enough to stop the leakage. If the piston is screwed in too far, excessive hydraulic pressure will be necessary to operate the preventer, and rod damage can result.

As with the 'QRC', the secondary seal should not be activated during normal operations.

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  • U' BOP SHEARING OPTIONS

Large bore shear bonnets are designed to increase the available shearing force required to shear high strength and high quality pipe. In order to achieve this the large bore shear bonnet design increases the available closing area by 35% or more. Additionally a BOP fitted with tandem boosters can deliver increased shearing force while not increasing the wear and tear on the packers. Tandem boosters approximately double the force available to shear pipe. Since the tailrod has the same stroke as the BOP operating piston, the standard shear locking mechanism can be installed on the outside end of the booster.

Cameron Qrc Bop

Operating Data and Fluid Requirements

U BOP OPERATING DATA AND FLUID REQUIREMENTS

Bore Size & Working Pressure

71/16" All WP

11" Except 15,000 psi

11" 15,000 psi

13 5/8" Except 15,000 psi

13 5/8" 15,000 psi Model B

16 y"

3,000 & 5,000 psi Model B

16 y"

10,000 psi

3,000 psi & 21 /" 2,000 psi

21 /" 5,000 psi

3,000 psi

Gallons To Open Pipe Rams (1 Set)

1.3

3.4

6.1

5.4

10.4

9.8

11.6

21.2

7.9

27.2

24.5

10.1

Gallons To Close Pipe Rams (1 Set)

1.3

3.5

6.2

5.8

10.6

10.6

12.4

23.1

8.4

29.9

26.9

10.8

Locking Screw Turns (Each End)

18

27

32

32

45

38

45

54

46

54

51

58

Closing Ratio

6.9:1

7.3:1

9.8:1

7.0:1

10.6:1

6.8:1

6.8:1

7.4:1

7.0:1

6.2:1

7.2:1

7.0:1

Op ening Ratio

2.2:1

2.5:1

2.2:1

2.3:1

3.6:1

2.3:1

2.3:1

3.7:1

1.3:1

4.0:1

4.0:1

1.0:1

LARGE BORE SHEAR BONNET OPERATING DATA AND FLUID REQUIREMENTS

Bore Size & Working Pressure

71/16" All WP

11" Except 15,000 psi

11" 15,000 psi

13 5/8" Except 15,000 psi

13 5/8" 15,000 psi Model B

16 y"

3,000 & 5,000 psi Model B

10,000 psi

3,000 psi & 21 /" 2,000 psi

21 /" 5,000 psi

3,000 psi

Gallons To Open Pipe Rams (1 Set)

-

7.4

8.9

10.5

16.0

18.1

18.2

-

14.3

-

-

-

Gallons To Close Pipe Rams (1 Set)

-

7.6

9.0

10.9

16.2

19.0

19.1

-

14.9

-

-

-

Locking Screw Turns (Each End)

-

27

32

32

45

38

45

-

46

-

-

-

Closing Ratio

-

12.0:1

15.2:1

10.8:1

16.2:1

10.4:1

10.4:1

-

10.8:1

-

-

-

Op ening Ratio

-

4.8:1

3.7:1

4.5:1

6.0:1

4.4:1

4.4:1

-

1.7:1

-

-

The U II BOP is designed primarily for subsea use. It features a short stroke bonnet which reduces the opening stroke by 30%, reducing the overall length of the preventer and thus reducing the weight supported by the ram change pistons. The U II preventer wedgelocks act directly on the operating piston tailrod. The operating system can be interlocked using sequence caps to ensure the wedgelock is opened before pressure is applied to open the preventer. Like the U BOP the bonnets of the U II BOP are opened and closed using hydraulic pressure. Wedgelocks require a separate control system.

When combined with the CAMRAM packer the U II BOP provides a blow out preventer system that meets the API 6A rating of 250OF service. Packers and top seals are available for high pressure and H2S service.

Screw Retracting H2s Ram Block
  • rillinq S Well Services Trai ning
  • U' BOP - PIPE RAMS

Cameron pipe rams are available for use in Cameron ram-type BOPs to fit all commonly used sizes of tubing, drill pipe, drill collars and casing. Sealing elements are pressure energised and self feeding, incorporating a large reservoir of feedable rubber.

Shear Blind Ram

SHEAR BLIND RAMS

Shearing blind rams shear the pipe in the hole, then bend the lower section of sheared pipe, allowing the rams to close and seal. They can be used as blind rams during normal operations. The operating pressure required to shear pipe is 3,000 psi and the maximum size of pipe that can be sheared is 5 V2" OD. Shearing blind rams will shear pipe numerous times without damage to the cutting edge. The ram incorporates a single piece body with an integrated cutting edge.

Shear Ram Hydrill

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VARIABLE RAMS

A set of variable bore rams in a preventer provides back-up for tapered strings. The standard VBR contains steel reinforcing segments similar to those in the Cameron 'D' annular. The inserts rotate inward when the rams are closed, the steel providing support for the rubber which seals the pipe.

The Flex-packer and Flex-packer —NR (narrow range) are a variation in design with stacks of metal inserts bonded to the elastomer. As the ram is energised the proper set of inserts is forced against the pipe extruding rubber to create a seal.

The Dual-bore Flex-packer is designed to seal on three different pipe sizes in two different packer bores.

Other Cameron rams include the inserted packer ram for stripping/ snubbing service. A block of polyethylene is inserted into the ram packer to increase wear resistance.

Ram packers are available in the CAMERON range providing service in temperatures up to 350OF.

Joint Bop Cameron

'U' BOP WEDGELOCK

The wedgelock is a hydraulic mechanism which allows the BOP to be locked in the closed position remotely. The wedgelock assembly is attached to the BOP in place of the normal lock screw housing. With the ram in the closed position, energising the wedgelocks causes the floating wedge to slide forward and wedge the tapered tail rod in the closed position. This effectively locks the Ram in position even if hydraulic closing pressure is lost or removed from the operating piston. In order to open the ram the wedgelocks must first be unlocked by applying unlock pressure which forces the wedge back into the wedgelock housing. The tail rod of the ram is then free to move back. The operating system can be interlocked using sequence caps to ensure the wedgelocks are opened before pressure is applied to open the preventer. In subsea applications, a pressure balance chamber is used in conjunction with the wedgelocks to eliminate the possibility of hydrostatic pressure unlocking the wedgelocks. Wedgelocks are normally only used during well control operations and in special instances such as when the lower marine riser package LMRP is disconnected on a floating rig.

Snubbing Riser

Tail Rod Tail Rod Extension

HYDRIL RAM PREVENTERS

The Hydril ram type preventer is similar in operation and performance to the other ram preventers detailed in this section.

Features:

  • Manual locking BOPs incorporate a heavy duty acme-thread to lock the rams in the closed position or to manually close the ram if the hydraulic system is inoperative.
  • Multiple-position locking uses a hydraulically actuated mechanical clutch mechanism to automatically lock the rams in the closed position.
  • A Field replaceable seal seat provides smooth sealing surfaces for the ram upper seal.
  • Guide rods align the ram with the bonnet compartment, preventing damage to the ram, piston rod or bonnets while retracting the rams.
Hydril Bonnet Load Hinge

HYDRIL RAM OPERATION

Hydraulic fluid is required to operate Hydril Ram BOPs. Hydraulic passages and fluid connectors are contained within the BOP body. Operating fluid enters the BOP through the opening and closing ports in the body and is ported from the body through the fluid hinge and on to the operating cylinder. Normal operating pressure is 1500 psi. The ram upper surface is recessed to prevent seal seat wear while opening and closing the rams and to prevent scoring of the seal seat from a damaged ram. Energising of the upper ram seal and the seal seat is produced during the final off portion of the ram stroke.

Cameron Ram Lock Sequence Operation
Figure 10 - Hydraulic Fluid Circuit
Poslock System Bop

Hydril Ram Types

Hydril produce pipe, blind, variable, shear and offset rams. Rams include a large volume of feedable rubber in reserve between extrusion plates. The Ram blocks are rebated to slide on guide rails within the ram bonnet compartments. Certain rams have hardened steel inserts for hanging off operations. Seals and front packers are simple to change out in the field.

Hydril 16th Ram Block

Hydril Variable Rarn Lower Shear Blade Upper Shear Blade

Figure 12 - Ram Types

Hydril Variable Rarn Lower Shear Blade Upper Shear Blade

Figure 12 - Ram Types

Ram Preventer Type Cameron
Figure 13 - Ram Components

Rubber Extrusion

The front packer has a large volume of feedable rubber bonded to heavy anti-extrusion plates. As the rams meet face to face the plates on the front packer cause pressure in the rubber to initiate seal off. A new front packer provides a large clearance between the ram block and the pipe. As wear increases the clearance reduces as the ram blocks move closer to the pipe. The useful life of the front packer is complete when the clearance between the pipe and the ram block is zero.

Hydril Mpl
COMPLETE WEAR

MPL — Multiple Position Locking System

In addition to manual locks, Hydril offer a Multiple Position Locking System for remote automatic locking of the BOP. MPL automatically locks and maintains the ram closed even in the event of loss of closing pressure. Front packer seal wear requires a different ram locking position with each closure to ensure an effective seal off and the lock is only engaged when the ram reaches this position. A mechanical lock is automatically set each time the ram is closed.

Bop Parts Well Control
Figure 14 - Hydril 18 %" 10,000 psi Ram Fitted with MPL System
Psi Hydraulics
Figure 15 — MPL Clutch Assembly Components

Locking and unlocking of the MPL are controlled by a unidirectional clutch mechanism and a lock nut. Motion of the piston and tail rod during closing and opening of the rams causes the lock nut to rotate freely until the ram has come to a stop. The clutch assembly permits or prevents lock nut rotation. Once the rams are closed the clutch engages and opening pressure is then required to disengage the clutch in order to open the rams. Hydraulic opening pressure disengages the clutch plates to permit the lock nut to rotate freely as the ram opens. MPL is activated each time the rams are closed.

Mpl Hydril Clutch
Figure 16 — MPL in Locked Position

SHAFFER 'SL' RAM

The Shaffer 'SL' range is designed for large bore and high pressure subsea and deep land drilling, handling pressures from 15,000 psi down to 3,000 psi, with bore sizes 18%" to 71/16". The 'SL' BOP incorporates a mechanical locking system for use on surface stacks and has two types of automated locking systems for use subsea.

Shaffer Subsea Bop
11

Figure 17 - SHAFFER 'SL' (Triple) RAM

  • rillinq S Well Services Train in g
  • SL' RAM FEATURES
  • Ram bodies are available in single, double and treble models.
  • Rams can be changed out easily without breaking or remaking connections, even with pipe in the hole.
  • Single piston hydraulic operators have a minimum number of working parts, assuring reliability and low maintenance.
  • Available in flanged, hubbed or studded connections.
  • Full environmental H2S trim, conforming to API and NACE requirements.
  • Rams are available which will support a 600,000 pound drill string when a tool joint is lowered onto the closed rams.

PARTS DESCRIPTION

Bop Shear Ram

SHAFFER 'SL' - OPERATION

Hydraulic power is required to operate the 'SL' BOP. Any standard oil field accumulator with an operating pressure of 1500 psi can be used. 3000 psi can be used but this will accelerate wear of the piston seals and the ram rubbers. A 5000 psi test is applied to all Model 'SL' cylinders at the factory, however this pressure is not recommended for field use. The hydraulic operating fluid should be water soluble and have a viscosity of between 200-300 SSU at 100 F. Fuel oil of any kind should not be used as it causes rubber components to swell and deteriorate.

Sttipping Well Control
Ram Closing Circuit Ram Opening Circuit

Hydraulic Circuit

Hydraulic passages drilled through the body eliminate the need for external manifolds and piping. Each set of rams requires only one opening and one closing line. These are clearly marked on the side of the BOP and facilitate the accumulator hoses. Once an accumulator unit is hooked up to the BOP, hydraulic pressure is used to operate the piston into the open/closed positions. On surface stacks where the operating system is closed ended, the fluid in the opening chamber is re-directed through the open lines to the accumulator when the BOP is closed. Similarly when the BOP is opened, the closing fluid is displaced back to the accumulator unit through the closing line.

□ rillinq S Well Services Trai rung

MANUAL LOCKING SYSTEM 'SL' BOP

'SL' Rams are outfitted with manual locks when used on land and platform applications. During well control operations it is essential to lock the rams in the event that hydraulic pressure is lost.

Manual lock pistons move inward and when closing pressure is applied. If desired, the rams can be manually locked in the closed position by turning the locking shaft to the right until it shoulders against the cylinder head. Should hydraulic pressure fail, the rams can be manually closed and locked. They cannot be manually reopened.

The manual locking shafts are visible from outside and provide a convenient ram position indicator.

Rams are opened by first turning both locking shafts to their unlocked position, then applying opening hydraulic pressure top the pistons, which move outward and pull the rams out of the well bore.

The manual locking shafts are visible from outside and provide a convenient ram position indicator.

Shaffer Poslock

POSLOCK SYSTEM 'SL' BOP

'SL' preventers equipped with poslock pistons are locked automatically in the closed position each time they are closed. The preventers remain in the closed position even if closing pressure is removed. Opening pressure is required to open the pistons.

The hydraulics required to operate the Poslocks are provided through the normal opening and closing ports. No additional functions are required to operate the locking system.

When closing pressure is applied, the complete piston assembly moves inward and pushes the ram into the wellbore. As the piston reaches the fully closed position, the locking segment slides toward the piston OD, over the locking shoulder while the locking cone is forced inward by the closing pressure.

Multiple Position Lock Hydril

The locking cone holds the locking segment in position and is prevented by a spring from vibrating outward if the hydraulic closing pressure is removed. The locking cone is basically a second piston inside the main piston. It is forced inward by closing pressure and outward by opening hydraulic pressure. When opening pressure is applied, the locking cone moves outward and the locking segment slides towards the piston ID along the tapered locking shoulder. The piston is then free to move outwards and open the rams. Poslock pistons are adjusted in the factory and normally do not require adjustment in the field except when changing between pipe rams and shear rams.

ULTRALOCK SYSTEM 'SL' BOP

The UltraLock system has been designed to increase the capability of Shaffer BOPs, by providing maintenance free and adjustment free locking system. The ultralock operator is easily distinguished from the poslock by the large hex nut located in the centre of the cylinder head.

The locking system is a mechanical lock which consists of spring loaded segments that are engaged against restrained locking rods. Four rods are utilised with four mating segments; however; the load is carried on two rods and segments alternately. This allows a greater number of locked positions.

Nov Cylinder Ram Shaft
Locking Rod PlateI Locking Red \ Locking Load UltraLock Rom Retaning Screw I \ Dog Spring Piston Shaft

Locking Rod Plate Locking Dog

Retainer

As closing pressure is applied, the entire piston moves inward and pushes the ram into the wellbore. When a restriction is encountered by the ram assembly, the secondary piston continues to move, allowing the locking segments to spring radially outward until they engage their respective locking rods. The rams will continue to be held in a locked position even in the event that hydraulic pressure is lost or removed. The lock is achieved by a tooth profile that is machined into both the locking rod and the locking surface of the segment. The design is such that forces trying to open the preventer are resisted: the system allows for the locks to move into subsequent locking positions should further hydraulic pressure be applied.

As opening pressure is applied to the preventer, the secondary piston responds and, due to the main piston being restrained by the locks, pulls the locking segments radially inward. This then allows the main piston to move and open the preventer.

SHAFFER PIPE RAMS

Shaffer pipe rams are available in a variety of fixed bore sizes. The rams assembly consists of three major pieces- the ram block, ram rubber and the ram holder. The ram rubber is placed on the ram block, then the block and rubber are anchored to the ram holder to make the complete ram assembly. In most rams, two retracting (shoulder) screws secure the ram holder to the ram block but permit the block to move slightly in the holder to ensure positive alignment of the rubber faces as sealing contact occurs. Self-centring of pipe is accomplished by angular guides protruding alternately on top and bottom of ram blocks designed to close around a single string of pipe.

Retaining Screw Trunnion Nut /

Shear Rams Type Hydril

□ rillinq S Well Services Trai n in g

SHAFFER MULTI-RAMS

The Shaffer Multi-Ram is essentially a variable ram in that it can be close around different sizes of pipe. One set of Multi-rams will close and seal on pipe sizes ranging from 3 V2" to 5" OD. Multi-rams use the same holder and retracting screws as the other ram assemblies. The only new parts are the ram block, top seal and the special packing assembly. When the Multi-rams close on the drill string, there are steel segments moulded into the ram rubbers which move radially inward, decreasing the bore size.

Pipe Rams Blind Rams Pipe Top Rams

SHAFFER SHEAR RAMS - TYPE 72

Shaffer type 72 shear rams shear pipe and seal the wellbore in one operation. They also function as blind or complete shut-off rams during normal operations. 14" pistons are standard in all BOPs rated at 10,000 psi and higher. On most lower pressure preventers, optional 14" pistons can be supplied instead of the standard 10" pistons. 3000 psi closing pressure should be used to shear pipe.

Upper Rubber

Upper Rubber

Shaffer Shear Rams
Figure 18 - Shear Ram Components

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TYPE 72 SHEAR RAMS - SHEARING ACTION

When shearing, the lower blade passes below the sharp lower edge of the upper ram block and shears the pipe. Closing motion of the rams continues until the ram block ends meet. Continued closing of the holders squeezes the semi-circular seal upward and into sealing contact with the seat in the BOP body and energises the horizontal seal. The closing motion of the upper holder pushes the horizontal seal forward and downward on top of the lower blade, resulting in a tight sealing contact. The horizontal seal has a moulded in support which holds it in place when the rams are open.

Casing Shear Ram

Ram Opening and Closing Ratios

SIZE

WP (psi)

CAMERON 'U'

SHAFFER 'SL'

HYDRIL RAM

OPEN

CLOSE

OPEN

CLOSE

OPEN

CLOSE

7 1/16"

3,000

2.3

6.9

1.5

5.4

5,000

2.3

6.9

1.5

5.4

10,000

2.3

6.9

1.7

8.2

15,000

2.3

6.9

3.37

7.11

6.6

7.6

9"

2,000 3,000 5,000 10,000

2.6 2.6

5.3 5.3

11"

2,000

2.5

7.3

3,000

2.5

7.3

2.0

6.8

5,000

2.5

7.3

2.0

6.8

10,000

2.5

7.3

7.62

7.11

2.4

7.6

15,000

2.2

9.9

2.8

7.11

3.24

7.6

13 5/8"

3,000

2.3

7.0

3.00

5.54

2.1

5.2

5,000

2.3

7.0

3.00

5.54

2.1

5.2

10,000

2.3

7.0

4.29

7.11

3.8

10.6

15,000

5.6

8.4

2.14

7.11

3.56

7.74

16 3/4"

2,000 3,000

2.3

6.8

5,000

2.3

6.8

2.03

5.54

10,000

2.3

6.8

2.06

7.11

2.41

10.6

3 4"

10,000

3.6

7.4

1.83

7.11

1.9

10.6

15,000

4.1

9.7

1.68

10.85

2.15

7.27

21 1/4"

2,000

1.3

7.0

0.98

5.2

3,000

1.3

7.0

0.98

5.2

5,000

5.1

6.2

1.9

10.6

10,000

4.1

7.2

1.63

7.11

26 3/4"

2,000 3,000

1.0

7.0

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Responses

  • j,kahoe
    with the hydraulic lines distroyed can the ram shear be opened on a BOP through a mechanical method [email protected]
    9 years ago
  • gilly
    How to change seal in hydraulic ram?
    9 years ago
  • filibert
    Is variable rams is different for 10000 psi and 15000 psi?
    8 years ago
  • tuuli uotila
    What is the weight of a 18 3/4 bop ram block?
    8 years ago
  • Selamawit
    Is there a cameron packer for 71/16" "u" x 11/4"?
    8 years ago
  • Sheshy
    What is Shaffer BOP Poslock?
    8 years ago
  • Rodrigo
    How to tight 13 5/8"cameron BOP bonnet bolts?
    8 years ago
  • Kristian
    How to remove piston of of shaffer annular bop 13 5/8" 5m?
    8 years ago
  • Saradoc
    What is Blind Ram Preventer?
    8 years ago
  • Elias
    What are booster cylinder in shaffer bops?
    8 years ago
  • ORAN
    Where is the vent on a Cameron Utype BOP?
    8 years ago
  • Tristan
    What is procedure for shutting blind rams?
    7 years ago
  • Beverly
    How does poslock ram bop work?
    7 years ago
  • simon
    What are flex bore rams?
    7 years ago
  • fred
    Where are the hydril bop weep holes on double rams?
    7 years ago
  • Sebastian
    How to calculate closing ratio for BOP rams?
    7 years ago
  • Senait
    Is the 3 1/2 5 7/8 shaffer multi ram a modification?
    7 years ago
  • roxanne
    Why u in cmaeron u bop?
    7 years ago
  • carolyn
    Are VBR preventers designed to be wellbore assisted?
    7 years ago
  • pasqualina
    How to calculate BOP pressure rating for a?
    7 years ago
  • gorbulas greenhand
    Why are ram locks used in bops?
    7 years ago
  • Mya
    Can we use hydril rams in cameron bop?
    7 years ago
  • mary wright
    What is the difference between a grip shear ram and a shear seal ram?
    7 years ago
  • pandora
    What is the distance between rams on a 18 3/4" cameron U double BOP?
    7 years ago
  • iolanda
    When closing rams they receive full accumulator pressure of 3000psi?
    7 years ago
  • Helena
    How does a dual pcp ram bop work?
    7 years ago
  • brogan
    What is BOP locking feature?
    7 years ago
  • grant
    What is 11" 5,000 psi Control Flow Double BOP Type U?
    7 years ago
  • Massawa
    How piston in moved in ram bop?
    7 years ago
  • Hana
    What is api's requirement for ram preventers?
    7 years ago
  • sofia
    What is the positive lock on a blind shear ram?
    7 years ago
  • dawit
    How do bop booster bonnets work?
    7 years ago
  • anacleto
    What is bop shear boost?
    7 years ago
  • stephanie
    Can you shear pipe with shaffer manual lock bop?
    7 years ago
  • calleigh
    How to Calculate Closing Ratio cameron shaft?
    7 years ago
  • sebhat
    Is there a proper breakin procedure for 4" 7 " VBR bop rams?
    7 years ago
  • faramir
    Can cameron blind/shear rams hold pressure from top and bottom?
    7 years ago
  • LETE
    How bop shear rams work?
    7 years ago
  • christina
    What type of elastomer are use on snubbing rams?
    6 years ago
  • victor easter
    What is API for length of ram preventer lock screw wrench?
    6 years ago
  • Celedor Tunnelly
    Are there bonnets on bops?
    5 years ago
  • Orlando
    When to open and close the rams on a bop?
    5 years ago
  • JESSE
    Where to place the ram block?
    5 years ago
  • Uwe
    What is ram to ram on snubbing "u it"?
    5 years ago
  • Aziza
    How does a BOP shear boost system work?
    5 years ago
  • JOHN
    Can Flex packers seal on inbetween sizes?
    5 years ago
  • jean harrison
    Can cameron 18 3/4 bop shear 4130 production tubing?
    5 years ago
  • isto weckman
    What is the purpose of ram boosters on bop?
    5 years ago
  • ella
    What is the function of wheep hole on pipe ram?
    5 years ago
  • Nicole
    HOW TO CHANGE RAMS IN 13 5/8" 10 M BOP.?
    4 years ago
  • NIKLAS
    How do tubing rams work on a bop?
    4 years ago
  • TERO
    What ram locking device does not allow self feeding of ram packers to allow packer wear?
    4 years ago
  • Margie Miller
    How to change seals on a cameron typr U BOP?
    4 years ago
  • luca wright
    What is the different between variable ram and fixed ram type bop?
    4 years ago
  • GRIMALDA
    What is the difference between variable ram type and fixed rem type of a BOP?
    4 years ago
  • peony goodchild
    What is the purpose of a weephole on a ram type bop?
    4 years ago
  • april
    What is function of bop weep hole?
    4 years ago
  • enza
    Why front packers of pipe ram preventers closed between steel plates?
    4 years ago
  • Moro
    When are shearing rams used on land wells?
    4 years ago
  • mulu
    HOW PIPE RAM SEAL THE WELL?
    4 years ago
  • alfredino iadanza
    How to measure a type 70 bop ram blocks?
    4 years ago
  • Antti
    What is the recommended action if weep hole has leak in bop?
    4 years ago
  • iris
    Do variable rams hold on manual locks?
    4 years ago
  • RAHEL ABRHA
    How does the bop hydraulic clutch work?
    4 years ago
  • UTE
    How much pressure to open a bop pipe ram?
    4 years ago
  • Fiori Aman
    What do blind shear ram boosters do?
    4 years ago
  • Vilho
    How to open bop pipe rams?
    4 years ago
  • MAXIMA
    How are bop rams activated?
    4 years ago
  • SILKE COLE
    Why is a shear ram on the bottom and a seal ram on top?
    4 years ago
  • marcus chubb
    How can you tell if bonnet seal on ram preventer is leaking?
    4 years ago
  • ROBERT
    Do you have o change out the blind rams on the bops if you shear pipe?
    3 years ago
  • casimiro
    What is the Opening ratio of ram bop?
    3 years ago
  • morgan
    What is Opening ratio of ram preventer?
    3 years ago
  • Hamilcar
    How to double rams easily?
    3 years ago
  • Anna
    How do i calculate bop opening ratio?
    3 years ago
  • sakari
    How do you recoat hydraulic rams?
    3 years ago
  • fioretta lori
    Do new ram type preventers have weep holes?
    3 years ago
  • eve
    How to determine the BOP knowing the mud weight?
    3 years ago
  • jani
    Why we use the tandem boosters on bop?
    3 years ago
  • belladonna
    How does a variable bore BOP work?
    3 years ago
  • AZZURRA
    What does ST stand for in ST lock on Cameron BOP?
    3 years ago
  • patricia
    What type of fluid is used to close and Open BOP.. ?
    3 years ago
  • christina
    How does a blowout preventer booster work?
    3 years ago
  • romano
    How bop tandem boosters work?
    3 years ago
  • giusy fallaci
    What is the weep hole for on a set of ram preventers?
    3 years ago
  • poppy gordon
    What is opening ratio in blowout preventer bop?
    2 years ago
  • Salomone
    What do i do in BOP if weep hole leaking?
    2 years ago
  • luwam medhane
    How much pressure to shear drill pipe?
    2 years ago
  • Ermenegilda
    How much weight can a 7 1/16 cameron type u rams support?
    2 years ago
  • Valentin
    What is opening ratio in blow out preventer drilling formula?
    2 years ago
  • juan meier
    How to lock shaffer ram type bop?
    2 years ago
  • YEMANE NEFTALEM
    Can you interchange the bonnets on a cameron bop?
    2 years ago
  • daria
    How much time it should take to close or open a pipe ram of a BOP?
    2 years ago
  • diane
    How to teii if cameron 15k upper master is open?
    2 years ago
  • amaranto
    How many times can you function bops?
    2 years ago
  • codi
    How much hydralic fluid does a shaffer annular take?
    2 years ago
  • PALMIRA
    What pressure is required to close the blind ram of BOP?
    2 years ago
  • Shukornia
    What is weep hole in bop stack?
    2 years ago
  • fiorenza
    How to remove front seal in bop variable ram?
    2 years ago
  • Barbara
    How bop tandem booster works?
    2 years ago
  • Michelle
    HOW MUCH HYDRAULIC OIL DOES 11'' ANNULAR HOLD?
    1 year ago
  • belba galbassi
    How to differentiate between fixed and variable bop rams?
    1 year ago
  • Nicola
    How much pressure is required to seal against rubber seal?
    1 year ago
  • tauno
    How to lock a schaffer blind ram?
    1 year ago
  • yolanda
    What is the maximum pipe size that can be sheared by 13 5/8" ram?
    1 year ago
  • jari
    How much does hydril sl annular weight?
    11 months ago
  • Kirstin
    Can blind / shear rams be tested from above ?
    10 months ago
  • belladonna
    What is tandem shear ram?
    9 months ago
  • ELLIOTT
    How long does it take for bop rams to close?
    9 months ago
  • sandy burns
    How to calculate the closing ratio for a blowout preventer?
    9 months ago
  • David
    How ram bops control well?
    9 months ago
  • tiffany
    Can you close flex rams on open hole?
    8 months ago
  • steffen blau
    Can you close pipe rams on 7" tubing?
    6 months ago
  • Rosanna
    Can we hang off the drill string on closed variable rams?
    5 months ago
  • annemari
    How large of pipe will shear rams on a 3M BOP shear?
    5 months ago
  • Teemu
    How to open bonnets on cameron u type bop?
    5 months ago
  • Terenzio
    Why enclosed front packer bop ram?
    4 months ago
  • julia hood
    Do the bonnets have pressure when Cameron 13 5/8 type U ram closed?
    3 months ago
  • marco
    When dealing with blow out preventers when do you want the blind rams over the pipe rams?
    3 months ago
  • alessandro
    HOW MANY GALLONS OF HYDRAULIC FLUID DOESMIT TAKE TO CLOSE 135M SHAFFER LWS?
    3 months ago
  • almaz
    Can a blind ram bop close around pipe?
    3 months ago
  • Wolfgang
    Are pipe rams wellbore assist?
    3 months ago
  • laurence
    How ram is useful in bop?
    2 months ago
  • leon ebersbacher
    How to align large bore pipe in the field?
    2 months ago
  • Demsas
    What is a secondary sealing surface?
    1 month ago

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