Nozzle design for lethal service 2

jtseng123 · Sep 4, 2013

Dear all,

I searched several places and did not find nozzle has to be integrally reinforced nor radiagraphable design for category D joint per code for lethal service. Only full penetration weld is needed. Do I miss something ?

SnTMan · Sep 4, 2013

jtseng123, I don't think so, but I would prefer integral reinforcement of nozzles to permit future inspection.

Regards,

Mike

doct9960 · Sep 4, 2013

jtseng123,

You are correct in saying that only full penetration weld is required by the Code. Integral reinforcement or radiographable nozzles (i.e. lip type or Q-type nozzles) are just preferences.

The following ASME interpretations indicate that nozzles with separate reinforcement plates are allowed.

Interpretation: VIII-1-98-23
Subject: Section VIII, Division 1 (1995 Edition, 1996 Addenda); Fig. UW-16.1
Date Issued: March 18, 1998
File: BC97-522
Question: May the attachment details shown in Fig. UW-16.1 sketch (a) or (c) be used on a vessel intended for use in lethal service?
Reply: Yes.

Interpretation: VIII-1-98-113
Subject: Section VIII, Division 1 (1998 Edition, 1999 Addenda); UW-2(a)(1)(d)
Date Issued: March 22, 2000
File: BC00-100
Question (1): May reinforced pads attached with fillet welds as shown in Fig. UW-16.1 sketches (a-2) or (h) of Section VIII, Division 1, be used on vessels designed for lethal service per UW-2(a)(1)(d)?
Reply (1): Yes.

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Nozzle design for lethal service 2

jtseng123

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