API 16C API 6A Choke manifold well control equipment

API 16C API 6A Choke manifold well control equipment ApplicationChoke manifold is a necessary equipment to control the well kick successfully and execute the pressure control technology on oil &

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API 16C API 6A Choke manifold well control equipment



Choke manifold is a necessary equipment to control the well kick successfully and execute the pressure control technology on oil  & gas well in the course of drilling, as it is, the equipment is adopted to execute new drilling well’s technique of balance pressure, which can prevent the pollution of oil-layer, improve the speed of drilling and control blowout effectively. One end of the device connects with the side flange of BOP spool. When BOP closes, it can control the finite pressure from casing by adjusting the choke valve’s opening, so balanced drilling can work under minimum pressure-difference.


Assembly & structure

Choke manifold consists of choke valve, gate valve, pipeline, fittings and pressure gauge etc.

Working Principle

When the pressure rising in well, fluid in well can be released in utilization of the choke valve opening/closing in choke manifold to control casing pressure, which can directly blow out through gate valve when the casing pressure is quite high.


Pressure level is divided into five levels, 2000psi, 3000psi, 5000psi, 10000psi, 15000psi; it can be designed according to the requirement of client.

Choke manifold is according to the requirement of API Spec 16C.

Working Pressure: 20000psi~15000psi

Nominal Bore Size: 2 1/16’’~4 1/16’’


Operation Requirement

All the working pressures of parts in choke manifold should be matched with the working pressure of the BOP stack used;

Choke manifold should be installed at the place where operator approach it conveniently, pressure test should be executed as installation, while the sealing test pressure should be equal to the rated working pressure;

Pipeline should be as smooth and straight as possible, the corner of the pipeline should be made of 120 shaped forged steel bent pipe, which should have adequately large bore;

The working pressure gauge should be installed;

In winter, the choke manifold should be able to work under a low temperature condition.


Choke manifold





Main and side outlet bore
in (mm)

31/8×21/16(80×52)  41/16×29/16(103×65)  41/16×31/16(103×78)

Nominal pressure
psi (Mpa)

3000 (21), 5000 (35)

3000 (21), 10000 (70)

Working temperature

LU  -46℃ ~ +121℃ (-50°F ~ 250°F)

Working medium

Drilling fluid, mud, oil (sour oil)

Controlling form

Dual-Wing manual choke valve

Dual-Wing fluid manual choke valve

Tri-Wing fluid manual choke valve