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API 16C Choke Manifold

The API 16C choke manifold is designed and manufactured to the API specification 6A and 16C standards. This is a crucial well management device specially made for injecting heavy mud, water, or fire extinguishing agents during drilling.

As the pressure inside the wellhead increases, a drain manifold can pump heavy drilling fluid into the well to even out the pressure at the bottom of the well and avoid well strikes and ejections. The main parts of the API 16C kill and choke manifold include choke valves, gate valves, pressure gauges, and line pipes.

What is the API 16C specification for the choke and kill manifold?

API 16C specification specifies the performance, design, materials, testing, inspection, welding, marking, handling, storage, shipping, and purchasing requirements for the oil and gas industry’s surface and underwater choke manifold.

These requirements provide safe, functionally replaceable water and underwater choke and kill system equipment. In addition, this specification does not apply to choke and kill device repairs, except for manufacturing-related welding repairs.


API 16C Choke Manifold are the devices needed to successfully control well kick and implement oil/gas pressure control techniques during the drilling process. Many industries use this device to implement a new borehole technology that balances pressure. This prevents oil reservoir contamination, improves drilling speed, and effectively controls blowout. By adjusting the opening of the kill and choke valve, the finite pressure coming out of the casing can be controlled, and balanced drilling works with minimal pressure difference.

Assembly and structure

API 16C manifold consists of operating principles such as choke valves, gate valves, pipelines, fittings, and pressure gauges.

When the pressure inside the well rises, the fluid in the well can be discharged by controlling the pressure in the casing using the open/close valve of the stopcock choke valve. It can be blown through quickly, but the case pressure is so high that it has a gate valve.

Operational requirements

  • All components in the stopcock must match the working pressure of the BOP stack used.
  • Install the stopcock in a place that is easily accessible to the operator. The pressure test must be performed as equipment, but the seal test pressure must correspond to the rated working pressure.
  • The pipeline should be as smooth and straight as possible, the corners of the pipeline should be 120 ° bent forged steel pipes, and holes of sufficient size are required.
  • Install a working pressure gauge.
  • In winter, stopcocks work at low temperatures.

Bottom Line

The choke and kill manifolds comply with API 6A, 16C, and 53 standards. The manifold can be used with operating pressures up to 15,000 PSI.

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