R – 11.968"
4.4 BOP Modifications
4.4.1 Piston Indicator Hole Modification
Older Model BOPs without piston indicator holes may be modified as shown in Figure 4-4 below.
.719 DRILL 1/2"-14NPT TAP .339" DIA.
DRILL THROUGH
PISTON INDICATOR BOP
CL CL
Figure 4-4:
Field modification for addition of Piston Indicator Hole to older model BOPs.The procedure* for adding the piston indicator hole is as follows:
1. Drill one .339" diameter hole through the BOP head at a point located on R=11.968" radius from the centerline ( ) of the BOP Head.
2. Counterbore with .719 " diameter drill. x 1 3/8" deep.
3. Tap the .719" diameter hole with a 1/2"-14 NPT tap.
4. Insert a 1/2"-14NPT pipe plug and torque to 50 lb-ft.
* A drill press should be used.
CL
OPERATORS MANUAL
GK
®11”-5000 psi
Annular Blowout Preventer
May 2001
4-5
4.4.2. Bolted Body Sleeve Modification
To maintain original integrity without welding, older model BOPs having a welded body sleeve may be repaired through conversion to a bolted sleeve. This conversion is accomplished by using the Field Replacement Sleeve Kit, part number 1006100.
The Field Replacement Sleeve Kit contains the follow-ing:
1. 1—Drill Template 2. 1—27/64" Dia. Pilot Drill 3. 1—19/32" Dia. Counterbore Drill 4 1—1/2"-13UNC Tap
5. 1—Bolted Body Sleeve
6. 12—1/2"-13UNC X 1 1/4" Lg. Hex Head Cap Screws The procedure for converting the BOP from a slotted body sleeve to a bolted sleeve is as follows:
1. Remove old body sleeve.
2. Grind out all weld from the counterbore and the 20o
bevel that would interfere with the new sleeve (see Figure 4-5).
3. Insert drill template as shown in Figure 4-6.
4. Drill one 27/64" diameter hole, 1 1/4" deep, through one of the 27/64" diameter holes in the template.
NOTE: Template has eleven 27/64" diameter holes and one 9/16" diameter hole.
5. Remove the template and counterbore hole with 19/32"
diameter drill (see Figure 4-7).
6. Tap the hole with 1/2"-13UNC tap, 1" deep.
7. Re-insert the template and bolt to the BOP through the 9/16" hole in the template.
8. Drill a 27/64" diameter hole, 1 1/4" deep, in the 11 remaining places.
9. Remove the template and counterbore 19/32" diameter in 11 places.
10. Tap 11 holes with 1/2"-13UNC tap.
11. Install new sleeve and bolt down tight (see Figure 4-8).
Grind All Weld From
Counterbore And 20o Bevel 27/64" Dia. Drill Drill Template
13 1/8 +/– 1/16" To Top Of Body 19/32" Dia. Counterbore Drill
With 27/64" Dia. Pilot
Bolted Body Sleeve
Figure 4-5 Figure 4-6
Figure 4-7
QUICK REF.
1-1
R
OPERATORS MANUAL
GK
®11”-5000 psi
Annular Blowout Preventer
OPERATORS MANUAL
5.1.1 HEAD REMOVAL (ITEM 1)
Close and open the packing unit to break loose any accumulation of drilling fluid or debris which may be re-stricting full downward travel of the piston.
Vent opening and closing chambers to atmosphere ensuring that no trapped pressure exists which will cause personnel and/or equipment damage. Open valves in con-trol system to have an exhaust and/or loosen hydraulic connections to allow leakage.
Release head by removing the head lock screw (item 19). Install two (1 1/4"-7NC) eyebolts in the top of the head in the holes provided. Use a piece of strong pipe or rod (3"
-4" pipe) 10 to 12 feet long as a lever against the eyebolts to apply counterclockwise torque (left hand) on the head.
Rotate head (approximately 10 turns) to release, then lift clear of BOP. A vertical lift may be applied to the eyebolts to take the weight of the head off of the threads while applying torque to the head. This lift will reduce the required opening torque. If the head was improperly installed at the last reassembly, it may be necessary to apply considerably more torque on the head by the use of a winch or catline while alternately applying and releasing pressure to the opening chamber (1500 psi maximum).
DO NOT attempt to loosen the head by applying heat on the thread area.
5.1.2 PACKING UNIT REMOVAL (ITEM 2)
Install two (5/8"-11UNC) eyebolts into packing unit. Lift packing unit out of piston. Use a sling of adequate length to prevent side loading of eyebolts.
5.1.3 PISTON REMOVAL (ITEM 3)
Install two (5/8"-11UNC) eyebolts in top of piston. Place a wooden spacer block (approximately 1/2" thick) between each eyebolt and the piston wall to protect the piston sealing surface.
Gently lift piston vertically to free from preventer body. If a vertical lift is unfeasible or if the piston does not freely lift out, slowly apply low (50 psi) hydraulic pressure to the closing chamber-DO NOT USE AIR OR GAS!
5.1.4 SLOTTED BODY SLEEVE REMOVAL (ITEM 4) Remove the six slotted body sleeve bolts (item 18) from around the slotted body sleeve. Lift out slotted body sleeve with a sling and hooks under the slots. Some model BOPs have a welded body sleeve which is not removable.
Figure 5-1:
Exploded View GK® 11"-5000 psi
1
NOTE: Seal Rings MUST BE installed in position shown by cross-section.
R
OPERATORS MANUAL
Exploded View GK® 11-5000 psi
1
NOTE: Seal Rings MUST BE installed in position shown by cross-section.
5.2 Assembly
5.2.1 CLEAN AND INSPECT ALL PARTS BEFORE ASSEMBLY
Inspect all seals and replace any damaged seals or seals in use over one year.
Seal rings MUST BE installed in positions shown by cross section! Lubricate all seal rings prior to installation.
(Silicon grease or castor oil is best).
5.2.2 SLOTTED BODY SLEEVE INSTALLATION (ITEM 4)
Install slotted body sleeve (item 4) into inside bottom of blowout preventer body. Install six slotted body sleeve bolts (item 13) and torque to 70-90 lb-ft. Some model BOPs have a welded body sleeve which is not removable.
5.2.3 PISTON INSTALLATION (ITEM 3)
Lubricate and install lower U-seals (item 10) in seal grooves in lower segment of piston.
Lubricate and install middle U-seals (item 9) in seal grooves in middle segment of piston.
Install two (5/8"-11UNC) eyebolts in top of piston with wooden spacer blocks between eyebolt and piston wall.
Lubricate all mating surfaces before lowering piston into body. Install piston into preventer body. Ensure that vertical alignment between piston and body is achieved prior to lowering piston. After proper alignment is obtained, the weight of the piston alone will take the piston its full normal stroke to the bottom of the preventer body. Be careful to prevent seal damage during assembly.
Remove eyebolts and spacer blocks.
5.2.4 PACKING UNIT INSTALLATION (ITEM 2) Lubricate piston bowl.
Lift packing unit with two (5/8"-11UNC) eyebolts and set into piston bowl, already installed in preventer.
5.2.5 HEAD INSTALLATION (ITEM 1)
Lubricate and install upper U-seals (item 8) in seal grooves on inside of head.
Lubricate and install head gasket (item 6) on outside of head just above screw threads. Clean threads of foreign matter and check threads for burrs or rough edges. Apply a generous coating of zinc base (lead-free) tool joint lubricant to the threads of head and body. This lubrication will ensure easy head removal at the next disassembly.
Locate and mark hole in body for the head lock screw (item 19).
Lift head using the two (1 1/4" -7NC) eyebolts and chain sling assembly.
Align the lead thread of the head with the lead thread in the body.
Screw head clockwise (right hand) into body until it shoulders against top of body. Line up lock screw hole in head with hole in body and install head lock screw (item 19).
Remove eyebolts from head. Preventer is ready for use/
testing.
OPERATORS MANUAL
GK
®11”-5000 psi
Annular Blowout Preventer
May 2001
5-3
Pipe Plug (17)
BOP Head – Screwed (1)
Wear Plate Capscrew (30) Head Gasket (6)
Wear Plate (29)
U-Seal, Upper (8) Packing Unit (2)
Piston (3)
U-Seal, Middle (9)
Body (5)
Slotted Body Sleeve (4)
U-Seal, Lower (10)
Slotted Body Sleeve Capscrew (18)