A. Part Preparation Prior to Assembly
The work area should be clean and well lighted.
1. Remove all dirt, grit, oil, and contaminates from the ram bore, ram change
piston holes, bonnet stud holes, all fluid passageways in the body, and inter-
mediate flange. Clean water and detergent should be used for cleaning.
High pressure air may also be used if it is dry air.
2. Clean all internal surfaces of bonnets using clean water and detergent. Lubri-
cate internal sealing surfaces.
3. Clean pistons, cylinders, and intermediate flanges, using clean water and de-
tergent. Lubricate areas that will come in contact with other parts.
4. Lubricate sealing surfaces behind the threads in the bonnet stud holes in the
BOP body after cleaning this area.
5. Sealed elastomer containers should not be opened until they are required for
assembly. This is to prevent contamination and damage to the seal.
B. Bonnet Assembly
Reference page 10.
1. Place each bonnet (3) on stands or pallets with the bore side up.
2. Install the tail rod lip seal (27) and the wiping O-ring (28) into the bonnet (3).
3. Place the operating cylinder O-rings (24) on the operating cylinder (6). These
O-rings are for standard bonnets only. The large bore shear bonnets do not
have a separate operating cylinder.
4. Insert the operating cylinder (6) into the standard bonnet bore.
5. Install the ram change cylinders (11) into the bonnet.
6. Place ram change piston O-rings (33) and the ram change piston to body
O-rings (29) on the both ram change pistons.
7. Insert the assembled ram change pistons (9) and (10) into the bonnet so that
the pistons with side holes are on the OPEN side, and the pistons with center
holes are on the CLOSE side.
Caution: Ensure that the threaded end of the ram change piston does not contact the
8. Place the operating piston wear ring (42) and the seal ring (26) onto the op-
erating piston (5).
9. Position the assembled operating piston into the bonnet.
10. Place the intermediate flange (2) on the assembly table with the threaded
holes for the guide pins (23) in the bottom position.
11. Place the operating piston rod O-ring (25) in the central bore.
12. Install the plastic packing ring (18) and energizing ring (19).
13. Install the connecting rod lip seal (20), lip seal retainer (40), the back-up ring
(21), and spirolox retaining ring (41).
14. Install the O-ring (30) onto the intermediate flange.
15. Install the cylinder O-rings (31) and (32) onto the ram change cylinder.
16. Apply a light coat of oil on the O-rings and inside the corresponding seal
bores in the bonnet (3) and the intermediate flange (2).
17. Install the assembled intermediate flange onto the assembled bonnet.
18. Install the cap screws (35) from the bottom side of the intermediate flange
and tighten them securely. Be sure that the plastic packing port on the inter-
mediate flange is on the same side of the assembly as the lifting eye hole on
the bonnet.
Caution: a. Ensure the the tail rod seals are not damaged.
b. Ensure that the seals are not damaged during the bonnet seating process.
Important: The threaded holes for the lifting eyes in both the bonnet and the intermedi-
ate flange must be on the same side of the connecting rod.
19. Tighten the cap screws in a crisscross pattern so that the intermediate flange
pulls down straight and level with respect to the face of the bonnet. Torque
the cap screws between 3350 and 3670 ft-lb (4542 and 4976 N•m).
20. Screw the ram guide pins (23) into the intermediate flange. Tighten the
guide pins with a pipe wrench to a maximum of 500 ft-lb (678 N•m).
21. Install the lifting eye (38) into the intermediate flange or into the bonnet.
22. Position the bonnet assembly next to the body and thread the ram change
pistons onto the body.
23. Tighten the rods securely against the body, using a crescent wrench on the
flats provided.
Warning: Make sure that the open and close pistons are in the appropriate location with
respect to the body.
24. Insert the bonnet bolts (12) through the bonnet and intermediate flange.
25. Push the bonnet bolt O-rings (34) over the bonnet bolt threads onto the un-
dercut.
26. Screw the plastic packing check valve (15) all the way into the preparation in
the intermediate flange.
27. Insert one stick of plastic packing (39) above the check valve and install the
plastic packing screw (16). Do not apply any torque to the plastic packing
screw.
28. Install a 1” NPT pipe plug (17) to close the hole.
29. Install the bleeder gland (36) with the plug (37) into the bonnet.
30. Install the double ended locking screw studs (13) into the bonnet. The short
threaded ends screw into the bonnet. These studs can be tightened with a
small pipe wrench used close to the bonnet.
31. Install the locking screw (8) into the locking screw housing (7).
32. Install the locking screw housing over the studs with the flats on the housing
flange vertical. Install and tighten the locking screw housing nuts (14).
Note: All hydraulic lines must be in place. Install the seal carrier before the rams are in-
stalled.
33. Lubricate the seal bores for the bonnet seal in both the BOP body (1) and the
intermediate flange (2).
34. Install the bonnet seal (22) that will reside in the seal bore of the intermedi-
ate flange.
35. Lubricate the seal with ram lubricant.
36. Close the bonnet asembly with 200 to 500 psi (13.8 to 34.5 Bars) operating
presure, trapping the seal carrier.
Caution: Keep hands out of the way during this operation.
37. Lubricate the seal with ram lubricant.
38. Once the bonnet seals are securely installed, connect the hydraulic lines to
the OPEN and CLOSE ports on the sides of the preventer body.
39. With the bleed gland (36) loose, on the top of the bonnets, apply 200-300 psi
(13.8 - 20.7 Bars) OPEN and CLOSE operating pressure alternately to expel air
from the operating system.
40. After the air is bled from the system, tighten the bleed plugs (37).
41. Install the appropriate ram assemblies (4) onto the operating piston rod.
42. After assembling both bonnets, apply 1500 psi (103 Bars) hydraulic pressure
to the rams OPEN connection to close the bonnets.
43. Apply thread lubricant to the threads and below the head of the bolt.
44. Screw in and torque the bonnet bolts to according to the charts on page 54
and 55.
In document
Cameron Type U BOP
(Page 45-48)