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®. 18-3/4” 15,000 psi Conventional Ram Blowout Preventer. Blowout Preventer (BOP).

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slide1

®

18-3/4” 15,000 psiConventional RamBlowout Preventer

blowout preventer bop
Blowout Preventer (BOP)

The equipment (or valve) installed at the wellhead to contain wellbore pressure either in the annular space between the casing and the tubulars or in an open hole during drilling, completion, testing,or workover operations.

Ram Blowout Preventer

A valve that uses metal blocks with integral elastomer seals to seal off pressure on a wellbore with or without tubulars in the bore.

18 3 4 15 000 ram bop
18-3/4 - 15,000 Ram BOP
  • Field replaceable seal seat for long service life and easy field repair
  • Multiple position locking (MPL) automatically locks rams in a seal-off position
  • BOP can be equippedwith blind shear,variable, pipe or casingrams for ultimate wellcontrol flexibility
  • Cylinder liners field replaceable
  • Hinged bonnets for ease of ram access
  • Fluid hinges removable for rapid simple seal replacement
  • One piece piston rod for strength and durability
18 3 4 15 000 ram bop1
18-3/4 15,000 Ram BOP
  • Bonnet bolts sized and arranged for reliable bonnet seal operation and proper bonnet stress distribution
  • Side outlets
  • Availablepressureenergized bonnetseal conversion
  • Stainless steel linedring grooves forcorrosion resistance
  • Piston seals pressure energizedlip seal for reliable seal operation
operation hydraulic circuit
OperationHydraulic Circuit
  • Application of hydraulic pressure to the operating cylinders pushes the pistons inward or outward to close or open the rams
  • The multiple position lock is an automaticlock, locking the rams in place after theyare closed hydraulically
  • Operating chambers are ratedfor 3000 psi continuousoperation and have beentested to 4500 psi
  • Hydraulic closing pressuresfrom 100 psi to 300 psi indicate satisfactory operation
operation hydraulic circuit continued
OperationHydraulic Circuit (continued)
  • Hydraulic pressure applied to closing port initiates fluid flow in drilled passages in the BOP body
  • Fluid flows from the body through the fluid hinge to the bonnet hinge
  • Fluid then flows from the bonnet hinge through a drilled passage in the bonnet and exits between the cylinder and cylinder liner
operation hydraulic circuit continued1
OperationHydraulic Circuit (continued)
  • Fluid then acts on the backside of the rams closing them
  • Fluid from the opening sides is pushedout the porting in the bonnet
  • Fluid flows through a drilledpassage in bonnet and intothe bonnet hinge
  • Fluid then passes throughthe seal sub in the fluidhinge, through the drilled passage in the preventer body and out through the opening chamber port
multiple position lock mpl
Multiple Position Lock (MPL)
  • Opening and closing controlled byuni-directional clutch mechanism,lock (overhauling) nut andlock (overhauling) screw
  • The clutch mechanismmaintains nut and ram inlocked position
  • The clutch is disengagedby hydraulic pressureto open the ram
multiple position lock mpl continued
Multiple Position Lock (MPL)(continued)

How the MPL Works

  • Tail rod contains two types of threads
    • One end - standard LH Acme thread
    • Other end - fast lead 6-path helical thread
  • Mating nut fitted to the tail rod
  • Nut contained by two thrust bearingspermitting rotation but preventing linear travel
  • Linear motion of the tail rod during closingor opening causes nut to rotate
  • Fast lead, 6-path helical thread rotates thenut three turns per foot of travel
multiple position lock mpl continued1
Multiple Position Lock (MPL)(continued)

How the MPL Works

  • Rear clutch plate and front clutch
  • Contact of rear clutch plate to front clutch platemaintained by spring force
  • Rotation in the opening direction prevented byinterlocking teeth
  • Sloped angle of teeth permits rotation in closing direction
  • Hydraulic opening pressure acts on the cylinderliner to release locking mechanism
  • Cylinder liner moves back against transfer ring
  • Transfer ring bears on the rear clutch platedisengaging it from the front clutch plate
  • Opening pressure on the piston moves the ramto the open position as the lock nut and front clutch plate rotate freely
multiple position lock mpl continued2
Multiple Position Lock (MPL)(continued)

How the MPL Works

  • The front clutch plate is bolted to the lock(overhauling) nut.
  • Four rectangular keys in the rear clutch plateengage slots in the retainer plate
  • Allows linear motion and prevents rotational motionof the rear clutch plate
  • Springs are captured between rear clutch plate and retainer plate
  • Opening forces on the piston rod held in check by thelock nut
  • Opening force creates torque in the lock nut
  • Torque is transmitted through the engaged teeth of front and rear clutch plates
  • The rear clutch plate is keyed to the retainer plate
  • The retainer plate is pinned to the cylinder head thus preventing rotation and locking the assembly
multiple position lock mpl continued3
Multiple Position Lock (MPL)(continued)

How the MPL Works

  • Application of hydraulicopening pressure permitsrams to open
  • Hydraulic pressure acting onthe cylinder liner moves it backto disengage the clutch
  • Continued application ofopening pressure maintainsthe clutch unlocked and opensthe rams
multiple position lock mpl continued4
Multiple Position Lock (MPL)(continued)

How the MPL Works

  • Provision for testing MPL
  • Two lockout devices
  • Prevent cylinder liner from disengaging clutch
  • Opening pressure simulates opening forces applied to the ram
  • Visual indication of position of lockouts provided
engineering data continued1
Engineering Data (continued)

+ Using Hydril BOP Thread Lubricant

* using light machine oil

engineering data continued2
Engineering Data (continued)

18-3/4 - 15,000 Hydril Clamp

Pressure-Tension-Bending Capability

  • Hydril clamp designed in accordance with procedures described in “Summary of Design Equations for Clamp Type Connectors” (1978 Rev.)
engineering data continued3
Engineering Data (continued)

18-3/4 - 15,000 PSI API Flange

Pressure-Tension-Bending

  • API flange capability calculated by a modified formula given in Appendix H of API Spec. for Wellhead Equipment 6A, Mar. 1983.
packers and seals fixed bore pipe rams
Packers and SealsFixed Bore Pipe Rams
  • Separate front packer and top seal
  • Top seal feedable rubber energized duringfinal seal off portion of the ram stroke
  • Front packer has large volume of feedable rubber bonded to heavy anti-extrusion plates for repeated closures and pressure cycles
  • Hy-temp front packers and top seals available
  • Hy-temp seals require the ram block be modified for their use
  • Hy-temp front packers are secured to the ram block by bolts
packers seals continued
Packers & Seals (continued)

Ram Change Procedures

1. Open (retract) the rams by applying opening pressure

2. Disengage all bonnet bolts

3. Manually swing both bonnets open and clear of BOP stack. Application of closing pressure to force open bonnet will damage piston rod(If the blowout preventer is not flanged to a wellhead or test stump, unbolt and open only one bonnet at a time to prevent blowout preventer from tipping over.)

4. Extend the rams by applying closing pressure

5. Remove the ram assembly by attaching an eyebolt in the hole provided and lift straight up

6. Replace with new rams and remove lifting eye

7. Retract ram back into bonnet compartment by applying opening pressure

8. Inspect bonnet seal and seal area, lube with a light weight oil

9. Clean and lubricate bonnet bolts with Hydril BOP thread lubricant

10. Manually swing bonnets closed and insert bolts

11. Hand tighten bolts starting with number one bolt, snugging bonnet to body. Then torque all bolts to 8500 ft-lbs*.Torque bolts beginning with the middle bolt on the off-hinge side, then the middle bolt on the hinge side. All other bolts may be torqued in any sequence.

* Other lubricants require different torque values.

packers seals continued1
Packers & Seals (continued)

Fixed Bore Pipe Rams

Front Packer & Top Seal Change-out

Standard Front Packers & Top Seals

1. Insert screwdriver between upper seal and frontpacker and pry up to remove upper seal fromits groove

2. Insert two screwdrivers, one on either side of thefront packer and work the packer out

Hy-Temp Front Packers and Top Seal

1. Remove top seal by inserting screw drive betweenupper seal and front packer

2. Remove two cotter pins from back of ram

3. Remove screws from packer

4. Remove packer

packers seals continued2
Packers & Seals (continued)

Fixed Bore Pipe Rams

Front Packer & Top Seal Change-out

(continued)

Regular Packers & Top Seal

1. Insert packer into ram until seated

2. Fit top seal in groove pins down

Hy-Temp Packers & Top Seal

1. Insert packer into ram until seated

2. Bolt packer in with two bolts

3. Insert cotter pins

4. Fit top seal in its groove

packers seals continued3
Packers & Seals (continued)

Shear Rams

  • Designed to shear drill pipe and seal off the wellbore
  • May be used as blind ramsto seal off the open hole
  • Shear blade design minimizesrequired shearing load
  • Dual V arrangementconcentrates deformingforces so drill pipe is crimpedon the shearing plane
  • Sharp rake angles imposeadditional tensile load to aid in pipe separation
  • After shearing lateral T-seal seals on the horizontal sealing surface of the lower blade carrier
packers seals continued4
Packers & Seals (continued)

Shear Ram Assembly

Lower Blade Shear Ram

1. Remove lower blade top seal

2. Remove the two lower blade cap screws and the lower blade

3. Remove the two anti-extrusion blocks

Upper Blade Shear Ram

1. Remove the two alignment pin setscrews

2. Remove the two alignment pinswith a common screw driver

3. Remove the three upper blade setscrews from the top of the block

4. Remove the four upper blade capscrews retaining the upper blade

5. Remove the upper blade

6. Remove the lateral T-Seal

7. Remove the upper blade top seal

8. Inspect all parts for wear and replace as required

packers seals continued5
Packers & Seals (continued)

Shear Ram Assembly

Lower Blade Shear Ram

1. Prior to assembly, visually inspect all parts, apply a coating of non-petroleum based oil such as castor oil to all seals and seal grooves, and lubricate all threads with Hydril thread lubricant

2. Install the lower blade on the ram block with the lowerblade cap screws

3. Install the two anti-extrusion blocks into the groovesof the ram block

4. Install the lower blade top seal in the upper sealgroove of the ram block

Upper Blade Shear Ram

1. Prior to assembly, visually inspect all parts, apply acoating of non-petroleum based oil such as castoroil to all seals and seal grooves, and lubricate allthreads with Hydril thread lubricant

2. Install the upper blade top seal into the upper sealgroove of the ram block

3. Install the lateral T-seal. Insure that the lower T-sectionof the seal is properly fitted within its groove

4. Install the upper blade with the four upper blade capscrews hand tight. Insure that the lateral T-seal isproperly fitted between the upper blade and the ram block. Torque the cap screws.

5. Install the three upper blade set screws into the top of the ram block. Torque the set screws

6. Install the two alignment pins and hand tighten snug with a common screw driver

7. Install the two alignment pin set screws and tighten snug

packers seals continued6
Packers & Seals (continued)

Hydril Variable Rams (HVR)

  • Designed to seal on a range of pipediameters3-1/2” - 5-1/2”- 31168334-1/2” - 7” - 3118844
  • Interlocking I-beam inserts molded intothe rubber
  • They confine the rubber within the packerand against the pipe to preventextrusion of the sealing element
  • Top seal has large volume of feedablerubber for long and dependable service life
  • Interchangeable with fixed rams or casing rams
packers seals continued7
Packers & Seals (continued)

Hydril Variable Ram

Disassembly

1. Remove top seal

2. Remove two cotter pins

3. Remove two bolts

4. Remove front packer

Assembly

1. Insert front packer

2. Screw in bolts

3. Insert cotter pins

4. Insert top seal

packers seals continued8
Packers & Seals (continued)

Replaceable Upper Seal Seat

Replaceable Metal Seat

  • Provides seal surfacefor the ram top seal
  • Lock ring energized by16 specially coatedsocket head set screwsto retain the seat
  • Contains one seal and backup ring
packers seals continued9
Packers & Seals (continued)

Bonnet Seals

  • Bonnet hinge seal
  • Bonnet sealMay be converted tolow-torque bonnetseal configuration
  • Piston rod mud seal
  • Bonnet to pistonrod seal
packers seals continued10
Packers & Seals (continued)

Cylinder Seals

  • Cylinder liner to bonnet seal - O-ring
  • Cylinder to bonnet seal O-ring
  • Piston seal - 3-piece bi-directional seal
  • Cylinder head seal
  • Cylinder head dirt seal
  • Lockout stem seal
packers seals continued11
Packers & Seals (continued)

Hinge Pin Seals

  • Hinge pin seal -O-ring
  • Hinge pin threadseal - O-ring
  • Hinge pin bearing seal -O-ring
packers seals continued12
Packers & Seals (continued)

Fluid Hinge Seals

  • Fluid hinge to bonnethinge seals O-ring
  • Fluid hinge tobody sealsO-rings
  • Sub to bonnet hingeseals O-rings
  • Sub to energizerseals O-rings
  • Energizer to fluidhinge seals -O-rings withbackup rings
maintenance
Maintenance
  • Visually inspect the body and ring grooves
  • Check all bolting
  • Check ring gaskets
  • Visually inspect
    • Bonnet seal areas
    • Bonnet seal grooves
    • Ram bores
    • Seal seats
    • Piston rods
  • Visually inspect
    • Ram blocks
    • Front packers
    • Top seals
    • Bonnet seals
maintenance continued
Maintenance (continued)
  • Once a year inspect
    • MPL bearings
    • BOP seal seat torails (ram cavity floor)
    • Minimum ram height
    • Maximum ramcompartment height
testing
Testing
  • Hydraulically test with clear water
  • Inspect all hydraulic connections
  • Set appropriate size test tool in test stump
  • Close pipe rams on appropriate size pipe. Check for hydraulic leaks
  • Increase wellbore pressureto test pressure required
    • Low pressure
    • High pressure
  • Check for leaks
  • Continue test until rams are tested
  • Unless you intend to ruin your testmandrel, DO NOT test shear ramswith pipe in the hole
testing continued
Testing (continued)
  • Lockout devices are manually operated and require either a 3/8” square drive or a 5/16” 12-point socket wrench
  • Close rams, visually check for leaks and reduce closing pressure to 100 psi
  • Check freedom of movement of lockout devices by alternately turning them clockwise then counter-clockwise about seven turns
  • Engage lockout devices. Rotate stem seven turns clockwise until snug
  • Bleed closing pressure to 0 psi
  • Apply opening pressure to 1500 psi in 500 psi increments, hold for three minutes. Check for leaks Visually observe rams for movement.
testing continued1
Testing (continued)

MPL Lockout Test

  • Reduce opening pressure to 0 psi
  • Apply 100 psi closing pressure
  • Disengage lockout devices by rotating stems counter clockwise about seven turns until snug
  • Gradually increase opening pressure from 0 until rams open
disassembly
Disassembly

MPL Cylinder Disassembly

  • Standard mechanics toolsrequired
  • Remove rams
  • Close bonnets and snugup to the two center bolts
  • Apply opening pressure
  • Install 1” lifting eye incylinder head (154) andsupport with a hoist
  • Remove ten cylinderhead cap screws (156)and remove cylinder head
  • The cylinder head seal (155), dirt seal (152), and rear lock nut bearing are now accessible
disassembly continued
Disassembly (continued)

MPL Cylinder Disassembly (continued)

  • Remove lock nut clutchassembly by rotating thelocating pin (158)counterclockwise.Identify it with itsrespective lockscrew (144)
  • Place clutch assemblyon a work bench
  • Remove eight screws(147) holding the frontclutch plate (146) to lock nut (143). As the screws are removed, the rear clutch plate (148) will be pushed toward the front clutch plate (146) by the springs (150).
disassembly continued1
Disassembly (continued)

MPL Cylinder Disassembly (continued)

  • Remove the frontclutch plate (146), therear clutch plate (148),its keys (151) and keykeeper (167) from locknut (143)
  • Remove the retainerplate (145) from thelock nut (143)
  • The front lock nutbearing (149) may beremoved from thelock nut
disassembly continued2
Disassembly (continued)

MPL Cylinder Disassembly (continued)

  • Support the cylinder (137) using a choker sling between the flange and the MPL lockout devices. Remove the twelve cylinder nuts (142) and slide the cylinder back over the piston and cylinder liner
  • The cylinder seal (133) andbackup ring (166) are now exposed
  • The transfer ring (164) shouldbe removed from inside the cylinder
  • Remove both lockout glands(160) from the cylinder byrotating counterclockwise
  • Separate the lockout segments(161) from the lockout stems (159)by rotating the stems clockwise (left handed threads) with the MPLlockout wrench (3/8” square drive)
  • The lockout stem seals (162) and backup rings (163) are now exposed
disassembly continued3

25

10

12

29

28

31

30

40

11

39

35

36

24

22

32

37

38

27

21

23

Disassembly (continued)

Fluid Hinge Disassembly

  • The fluid hinge and bonnet hingescontain all of the seals concernedwith the transfer of hydraulic fluidfrom the body to the bonnet andthe bonnet to the body
  • Reduce all operating pressuresto zero
  • Remove the two hex head capscrews (36) by counterclockwiserotation
  • Slip the fluid hinge (24) assemblyfrom between the bonnet hinges.As the fluid hinge assemblycomes away from the body watchfor the two fluid hinge to bodyO-rings (35)to preventlosing them
  • The seal sub assemblies contained in the fluid hinge are spring loaded.
  • Separate the seal sub (25) and seal sub energizer (27) by pulling them apart
disassembly continued4

52

54

59

58

55

56

57

53

75

74

63

60

141

62

61

Disassembly (continued)

Bonnet Removal

  • Insert two eyebolts in the toptwo holes of the bonnetNOTE: These holes are forlifting the bonnet assemblyonly and not the entire BOP.
  • Attach a chain sling tosupport the bonnet weight,disengage all bonnet bolts,and remove the two hingepins (61) by rotating fromthe load hinges. The hingepin thread and bearingseals (62 and 63) are nowexposed.
  • Remove the four bonnet hinge cap screws (73) from each bonnet hinge. Slide the bonnet out off the location pins (75). The bonnet hinge O-ring (74) is now exposed.
disassembly continued5

25

10

12

29

28

31

30

40

11

39

35

36

24

22

32

37

38

27

21

23

Disassembly (continued)

Bonnet Disassembly

  • The load hinge thrust (38) andradial (37) bearings are removed byunscrewing the four load hingecap screws.
  • The hydraulic connections (10) areremoved by unscrewing the fourcap screws (12). The hydraulicconnection O-ring is now exposed.
disassembly continued6
Disassembly (continued)

Upper Seal Seat Removal

  • Open both bonnets
  • Remove sixteen socket head set screws(5/16” hex key)
  • Seat should be free to be lowered fromits pocket
  • Caution! Have the seat blocked from belowto prevent injury should the seat drop
assembly continued

25

10

12

29

28

31

30

40

11

39

35

36

24

22

32

37

38

27

21

23

Assembly (continued)

Load Hinge Installation

  • The upper load hinge (21) is installedwith the hinge pin bearing seat up.It is fitted over the two locatingpins (22) pressed in the body.
  • The lower load hinge (2) is installedover two locater pins (22) with thehinge pin bearing seat down.
  • Install the four load hinge capscrews (23) on each hinge andtighten by clockwise rotation
  • Install the hinge pin thrustbearing (38)
  • Install the hinge pin radialbearing (37)
assembly continued1

Lock Ring 5

6

7

9

Seal Seat 4

Assembly (continued)

Upper Seal Seat Installation

  • Fit the lower seat to body O-ring (6) andbackup ring (7) to the seal seat (4)
  • Fit the lock ring (5) over the barrel of the sealseat (4) and seat it in its groove
  • Screw in sixteen set screws (9) until they just touch the lock ring (5)
  • Fit the seat into the body, blocking it up inplace
  • Engage the sixteen set screws (9) startingwith one adjacent to the split in the lock (5),then work around the seat (4) expandingthe lock ring into its groove in the body
assembly continued2

52

74

73

72

71

Assembly (continued)
  • Check machine finishes on bonnet (52) and bonnet hinge (71) or 72) for smooth surfaces
  • Install O-ring (74) to finish machine side of bonnet hinge (71 or 72) (Lubricate O-ring)
  • Attach bonnet hinge (71 or 72) to end of bonnet (52) with four bonnet hinge cap screws (73)
assembly continued3
Assembly (continued)

Bonnet Assembly Installation

  • Install two lift eyes in bonnet
  • Install lift sling
  • Install bonnet onto BOP aligning thebonnet hinge with the load hinges
  • Install the upper and lower hinge pins
  • Position the bonnet vertically by hingepin adjustment
    • Raise by loosening the lower hinge pinand tightening the upper hinge pin
    • Lower by loosening the upper hinge pinand tightening the lower hinge pin
    • Over-tightening may bind thrust washers
  • Bonnet position is correct when the guide pin on the bonnet enters the hole in the body smoothly
  • Install bonnet bolts and seals
assembly continued4
Assembly (continued)

Fluid Hinge Installation

  • Insert the seal sub into thesub-energizer
  • Insert springs into fluid hinge
  • Insert Seal sub/subenergizersinto fluid hinge
  • Install fluid hinge to bodyO-rings
  • Fit fluid hinge between bonnethinges
  • Fit washers over hex head cap screws and insert cap screws into fluid hinge
  • Torque cap screws to 250 ft-lbs
assembly continued5

Piston Seal 136

Piston Wear Ring

Piston Wear Ring

165

Piston 135

Assembly (continued)

MPL Cylinder Assembly

  • Inspect all machine surfaces to ensure all parts are clean and free from burrs
  • Install the piston seal (136) and piston wear rings (165) on the piston (135) as shown. The piston seal is composed of three separate parts. They may be immersed in hot water to increase their flexibility. The wear rings are split for ease of assembly and should be installed after the piston seal is in place.
assembly continued6
Assembly (continued)

MPL Cylinder Assembly (continued)

  • Place cylinder liner O-ring(140) and two backup rings(153) on the cylinder liner (139)
  • Install cylinder liner (139) overpiston (135) with the pistonstanding vertically on theT-slot end. Slide the cylinderliner partway onto the pistonsuch that the piston isapproximately 3” from therear end of the cylinder liner.
  • Install piston and cylinder liner assembly into bonnet
assembly continued7
Assembly (continued)
  • Install O-rings (162) and back-up rings (163) on lockout stems (159)
  • Install lockout segments (161), stems (159) and gland nuts (160) into cylinder (137). Retract segments fully by turning lockout stems approximately 7 turns counter-clockwise
  • Place cylinder to bonnet O-ring (138) and backup ring (166) on cylinder
  • Install cylinder into recess of bonnet. Install nuts (142) and torque to specification 1280 ft-lbs
assembly continued8
Assembly (continued)

MPL Assembly (continued)

  • Place the rear clutch plate (148) on a piece of cardboard or wood on a smooth table, clutch teeth down.
  • Slip the key retainer (167) through the hole in each of the four clutch keys (151)
  • Gently expand the key retainer andslip over the rear clutch plateoutside diameter. Position eachkey in its recess on the clutch plateand allow the key retainer to contract into its groove on the outsidediameter of the rear clutch plate
  • Insert the clutch springs (150) inthe rear clutch plate
  • Position the retainer plate (145),locating pin (158) upward, over theclutch plate/springs/clutch keys/key retainer sub-assembly. Lower the retainer plate onto the sub-assembly insuring that each of the clutch keys engage their respective slots in the retainer plate
  • Place the lock nut (143), large outside diameter end down, on a piece of card board or wood on a smooth table
assembly continued9
Assembly (continued)

MPL Assembly (continued)

  • Place one lock nut bearing (149) on the lock nut
  • Hold together the retainer plate, and rear clutch plate sub-assembly and turn them over as a unit such that the rear clutch plate’s teeth face upward. Slide this assembly onto the lock nut and bearing. Position the assembly such that the locatingpin on the retainer plate is over theedge of the table. This will allowthe retainer plate to rest squarelyon the lock nut bearing.
  • Place the front clutch plate (146),teeth downward, on the lock nutassembly
  • Thread two of the cap screws (147),180° apart, through the front clutchplate and into the lock nut
  • Alternate turning the two cap screwsuntil the front clutch plate is snug against the lock nut.
  • Install the remaining cap screws (147) and tighten to full torque value. The assembly will have to be held with a strap wrench to do this.
assembly continued10
Assembly (continued)

MPL Assembly (continued)

  • Install lock nut/clutch assembly onto lock screw such that timing marks match. Timing mark isindicated by a “T” stamped on the end of the lockscrew and on the end of the lock nut
  • Rotate the lock nut/clutch assembly clockwise until itshoulders in the cylinder. Mark the top (12 o-clockposition). Rotate the lock nut/clutch assemblycounterclockwise until it is located on the end of thelock screw. Disengage the clutch mechanism bydepressing the rear clutch plate with two “C” clampsplaced at points shown by the arrows. Align themarks on the lock nut and the locating pin onthe retainer plate by rotating the retainer plate/rearclutch plate sub-assembly. Release the “C” clampsand rotate the lock nut/clutch assembly clockwiseuntil it shoulders in the cylinder. The locating pinhole in cylinder head will now align with the locating pin in the retainer plate
assembly continued11
Assembly (continued)
  • Place the cylinder head O-ring (155) and the dirt seal (152) on the cylinder head (154)
  • Install rear lock nut bearing (149) into the cylinder head
  • Install cylinder head. Install cylinder head cap screws (156) and torque to specifications
  • Apply closing hydraulic pressure to extend piston rods
assembly continued12
Assembly (continued)
  • Extend the rams by applying closing pressure
  • Remove the ram assembly by attaching an eyebolt in the hole provided and lift straight up
  • Replace with new rams and remove lifting eye
  • Retract ram back in to bonnet compartment by applying opening pressure
  • Inspect bonnet seal and seal area, lube with a light weight oil
  • Clean and lubricate bonnet bolts with Hydril BOP thread lubricant
  • Manually swing bonnets closed and insert bolts
  • Hand tighten bolts starting with number one bolt, snugging bonnet to body. Then torque all bolts to 8500 ft-lbs.* Bolts denoted “N” may be torqued in any sequence

*Other lubricants require different torque values