RE: PIping Trivia

From: <SARE>
Date: Sat Oct 13 2001 - 12:52:00 EDT

> I cannot agree that it is a question of size whether to use a fig 8 or
> paddle, although the bulkiness of a fig 8 is a constraint as stated.
>
>

         "Engineering Standard" of some of the major refiners and petrochem have already adopted this practice (size varies between 10 and 14 NPS). This has helped maintenance a lot. The weight that ive mentioned is based on rated blanks and spacers.. Its not mandated in the API nor in the ASME.

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> My feeling is that a piper will need to include the dimension of the fig 8
> into his initial design because on high pressure lines the thickness of
> the
> paddle would cause severe stress on the bolted up flanges when this is
> removed.
>

  actually no. Designer uses a prepared table (showing dia, thickness, weight, rating etc) for both blanks and spectacles (with the excell its relatively easy) to spec out the mat'l

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> Furthermore the "visually" of whether the line downstream is isolated or
> not is an immense asset.
>

         During commissioning or major turnaround, the EPC or Operation will normally prepare a blind list to ensure that blinds are removed or are in proper postion not counting the signal your going to get from the control room . There's always a signoff .

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> Finally., with a fig 8, the rigger has no problem attatching his slings
> (the
> "bridge" provides a non slip area)
>

its not that simple. actually for a large blanks you will normally weld a handle instead of a paddle ( i know since part of a the work package we're issuing somtimes involved a lifting procedure - i dont know why its part of our job description) Received on Sat Oct 13 12:52:00 2001