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Code for custom gate valve?

Code for custom gate valve?

Code for custom gate valve?


First time in this sub-forum, hopefully it's the right place for my question. I searched around, but couldn't find any direct answers.

I work at a pressure vessel fabrication shop, and we have a job where we will be receiving and installing a custom gate valve (purchased by our customer). The gate valve supplier will not be supplying the valve with any code stamping of any sort, and our customer is asking for help ensuring the equipment is properly certified.

For custom valves, what is the North American standard for design and fabrication (B16.34?)?

How are custom valves certified, and what stamping (if any) is required?

For reference, some of the design conditions are:
  • Valve style: Gate valve
  • Location of installation: United States (not sure which state yet)
  • Design pressure: 1900psi
  • Design temperature: 300°F
  • Materials: 316ss
Thank you,

RE: Code for custom gate valve?

The valve is probably designed to API 6A or 6D specifications and in considered an non-monogramable item due to the specified design temperature and pressure. If your client had specified 2000 psi and 350F it would likely me monogramed according to API specifications.

Your client the system designer should be able to tell you which standards they expect the valve to meet. They should also have information about which piping code the system they are installing the valve into is expected to meet as well as having all of the required information for a unlisted component that this custom valve would require to said piping code. if not they may have a hard time getting a local authority to sign off on this valve, or is your client expecting you to certify and stamp another manufactures product?

RE: Code for custom gate valve?

Seen from a European point of view it is always the end user (your customers customer) that is responsible for specifying the quality and certification standards of all orders. (You get what you have ordered). Order description is regrettably often not done properly by qualified engineers, and significant details will be missing, even if you ask directly for clarification as a first step.

One way out of this both for you and your customer(used with success!)

To end user in writing: On basis of your request and specification (cross ref.) regarding (valve) we will supply as follows (without certification/tested to/tested by etc. etc.) We need your confirmation or specified requirement within xxx, or production might be delayed.

The trick here, and also the correct way, is not to take responsibility to assume or guess in what surroundings and to what restrictions and regulations the end product assembly is foreseen to operate.

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