API 6D vs ASME B16.10 face to face dimension

[Rovshan]

Good day, all.

As you know API6D has its valve face-to-face dimension table also ASME B16.10 also has.
Question:

When we should refer to these standards to identify the face-to-face dimension?
Can we use API 6D with ASME B16.10 dimension?
Please share your notes

Regards

 

[PeterIgg]

IMO an API 6D compliant valve will have a face to face per API 6D. The exception would be where there is no prescribed face to face dimension for that size/class. In that instance it is up to negotiation between manufacturer and end user. It does occasionally occur that a valve was made when there was no face to face dimension in API 6D for a specific size/class but there is now and a replacement is needed where the end dimensions are different to those specified in 6D, but the same as the original valve. In that instance I suggest that the valve would still be API 6D compliant but whether it complies to B16.10 is doubtful!

 

[Rovshan]

Thanks for answer

 

[LittleInch]

"Can we use API 6D with ASME B16.10 dimension?" Yes, but this will now be a special valve and will cost you 10 or 20 times what a valve with dimensions that match the main design code would cost.

But ask a vendor. Anything is possible but cost might be rather high....

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