Figure Figure

Oil Well Drilling FlangeImages Well Control Seals
10,000 lb Working Pressure (Inches)

Size

WP

A

B

C

D

E

Wt

No of Turns to Open

1 13/16"

10,000

1 13/16

18 1/4

5 11/16

18 5/8

8

206

12 1/2

2 V

10,000

2 1/16

20 1/2

5 11/16

9

218

13 1/2

2 9/16"

10,000

2 9/16

22 1/4

9

292

16

Flange specifications conform to API standard 6A

Flange specifications conform to API standard 6A

National Gate Valves are available with flanged ends in standard API bore sizes and working pressures. Special trims are available for sour gas and oil service on request. National Gate Valves are also readily available to accept most pneumatic or hydraulic operators. National Gate Valves meet the applicable standards set forth by the American Petroleum Institute. When ordering, be sure to specify quantity, size, working pressure, end connection, body and trim materials, and service conditions (such as temperature, pressure, and composition of flow material).

SECTION 6 : WELL CONTROL EQUIPMENT

Figure 6.4.11 - Components 113/16" thru 21/16" 15,000 psi

  • Bonnet Cap
  • Grease Seal

Stem Bearing

Figure 6.4.11 - Components 113/16" thru 21/16" 15,000 psi

Cameron Choke Manifolds

Handwheel

Shoulder Split Ring

Packing Gland r%--Hex Nut

Stud Bolt

Bonnet

Bonnet Gasket

Handwheel

Shoulder Split Ring

Packing Gland r%--Hex Nut

Stud Bolt

Bonnet

Bonnet Gasket

SECTION 6 : WELL CONTROL EQUIPMENT

Figure 6.5.12 - Type 'HCR' pressure operated gate valve

Figure 6.5.12 - Type 'HCR' pressure operated gate valve

Stud Bolt Calculations

The type 'HCR' pressure operated gate valves is a flow line valve requiring relatively low operating pressures. This is a single ram, hydraulic gate valve packed with elements similar to the old 'QRC' ram assembly. The closing ratio of well pressure to hydraulic operating pressure is approximately 8 to 1. Available sizes are 4-inch 3000 to 5000 psi working pressure, and 6-inch 3000 and 5000 psi working pressure with standard API flanges.

section 6 : WELL CONTROL EQUIPMENT

Figure 6.5.13 Figure 6.5.14

Figure 6.5.13 Figure 6.5.14

Choke Line Hcr Valve

HYDRAULIC OPERATED FAIL-SAFE VALVE

typf "f" gatf valvf

HYDRAULIC OPERATED FAIL-SAFE VALVE

typf "f" gatf valvf

Cameron type "F" Gate Valve

The Cameron type "F" gate valve is a commonly used valve on BOP system lines. The valve is conduit type with no pockets for solids to deposit and hardened rotating seats which distribute wear. Gates and seats may be replaced without disconnecting the valves. These valves may be equipped with either hydraulic or pneumatic operators. Control pressure is lower, especially at high operating pressures. Sizes from 1-13/16 to 6-6/8 inch are available in ratings of 2,000 to 10,000 working pressure.

Fail-safe type "F" valves are opened and held open by control pressure in the operating cylinder. Line pressure tends to close the valve because the gate and stem move outward in closing. Closing force is supplied by valve body pressure acting on the stem area, plus the action of a coiled spring. Since operating pressure is low so that closing ratio is not a problem, "fail-safe" models close automatically upon loss of pressure and are ideally suited for subsea use.

SECTION 6 : WELL CONTROL EQUIPMENT

Fail Safe Valves

High pressure choke and kill lines run from the stack to the choke manifold on the rig floor. To shut these lines off when not required, each is equipped with two fail safe valves. These can be opened hydraulically from the surface but when the opening pressure is released spring action automatically forces the gate closed. The valves are always rated at the same pressure as the stack and choke and kill lines.

Due to space limitations the first valve out from the stack (the inner valve) is a 90 degree type with a target to avoid sand cutting. The outer valve is straight through and must be able to hold pressure from on top as well as below when the choke and kill lines are tested.

In the Cameron type AF fail safe valve (fig 6.5.15) flow line pressure acting against the lower end of the balancing stem assists in closing the valve. A port in the operator housing allows the hydrostatic pressure due to water depth to balance the hydrostatic head of the operating fluid. A resilient sleeve transmits the sea water pressure to an oil chamber on the spring side of the operating piston. Without this feature the hydrostatic head of the operating fluid acting on top of the piston would tend to open the valve itself, especially in deep water.

Liquid lock between the two valves in each line is eliminated by porting the fluid exhausted from the pressure chamber when opening the valve, away from the neighbouring valve.

SECTION 6 : WELL CONTROL EQUIPMENT

Figure 6.5.15

Woodruff key Locking ring Sea water hydrostatic pressure

Sea water hydrostatic pressure equalizing port

Clamp Ring

"J" Packing Vent "O" ring

"J" Packing Junk ring Retainer ring Pin

Pipe plug Bonnet gasket

Adaptor stem

Balancing stem "O" ring

"J" packing "O" ring

"O" ring "J" packing

"O" ring Gland

Pipe plug

Operator fluid inlet Retainer ring Piston Set screw "O" Ring

Spring cartridge assembly

Resilient sleeve

Ring Pipe plug

Anti-extrusion ring

Figure 6.5.15

Operator fluid inlet Retainer ring Piston Set screw "O" Ring

Spring cartridge assembly

Resilient sleeve

Woodruff key Locking ring Sea water hydrostatic pressure

Sea water hydrostatic pressure equalizing port

Clamp Ring

"J" Packing Vent "O" ring

"J" Packing Junk ring Retainer ring Pin

Bop Failsafe Valve

Ring Pipe plug

Anti-extrusion ring

Gate and seat assembly Body

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Responses

  • leena
    What is the working pressure for 5000 api flange?
    8 years ago
  • john
    How work choke manifold?
    8 years ago
  • franziska eisenhauer
    How to assemble choke manifold components?
    7 years ago
  • fausto
    What is hcr gate valve rated for hydraulically?
    7 years ago

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