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ASME B16.5 RTJ Flanges

ASME B16.5 RTJ Flanges

ASME B16.5 RTJ Flanges

(OP)
How are the approximate distances between RTJ flanges determined in ASME B16.5?

RE: ASME B16.5 RTJ Flanges

My understanding is that RTJ flanges are sealed using self energising rings rather than gaskets. The RTJ flange has a larger face diameter than standard raised face flanges to accommodate a groove for the seal.

The approximate distance that will be gained between the flange faces is dependant on the elastamer used for the ring.

Each elastomer will compress differently to a given load and so the distance between flange faces will differ.

Additionally, it is generally considered that flange moment fulcrums occur at the mean diameter of the seal, the flange face will then deflect at the outer diameter so the final seperation is load dependant.

As a final note, read the specification thoroughly. Through hub dimensions for classes 150 and 300 are to the flange face, all others are to the base of the flange ring and do not include the face step. Furthermore, RTJ face dimensions are given seperately from all other forms and in many instances these are greater in depth than normal raised face flanges.

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