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The X Dimension - Mandatory or Not?

The X Dimension - Mandatory or Not?. The back face ID (“X”) dimension on 6B flanges carries a note: Reference dimension. It does not meet the usual definition of reference dimensions, which are dimensions that can be calculated from other dimensions of the part.

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The X Dimension - Mandatory or Not?

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  1. The X Dimension - Mandatory or Not? • The back face ID (“X”) dimension on 6B flanges carries a note: Reference dimension. It does not meet the usual definition of reference dimensions, which are dimensions that can be calculated from other dimensions of the part. • In the source document for the design of Type 6B flanges, ASME Specification B16.5, the X dimension is clearly mandatory. • The author believes it should be a mandatory dimension.

  2. SC6 Resource Group on Trees and Wellhead • Issue 1: Flange neck diameter for 6B flanges (2000 – 5000 psi) is not specified. (shown as a reference dimension but not defined elsewhere or by other dimensions) • Proposed change: Revise Tables 49, 50, 51, B49, B50, B51 to remove footnote ‘a’ (“a Reference dimension”) • Proposed action: Ballot and publish as errata.

  3. SC6 Resource Group on Trees and Wellhead • Issue 2:6A clause 10.16.6.1b) requires hydrostatic testing of electric actuators. • Proposed change: Change title of 10.16.6.1: from “b) pneumatic, hydraulic or electric actuators” to “b) pneumatic or hydraulic actuators.” (Note: Would then be consistent with 10.16.6.2 a) ) • Proposed action: Publish as erratum.

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