Thank you a lot for your answer. Now Everything is clear.
суббота, 19 апреля 2014 г., 20:50:39 UTC+5 пользователь pgoswami написал:
Hi Murat,Already there had been many correspondences on this issue. To clarify your query as per API-650, thermal stress relief and PWHT is the same (please see below the appropriate clause.).Firewater piping and associated components must meet NFPA guidelines. As plastic is a low melting materials, the use must be done with caution. Use the attachment with with highlights.Hope this would be of help.Thanks.Pradip Goswami, P.Eng,IWEWelding & Metallurgical SpecialistOntario, Canada5.7.3 Spacing of Welds around Connections
See Figure 5-6 for spacing requirements listed in 5.7.3.1 through 5.7.3.4.
Note 1: Additional weld spacing requirements exist in this Standard. Other paragraphs and tables dealing with nozzles and manholes may
increase the minimum spacing.
Note 2: Whenever stress relief or thermal stress relief is used in this Standard, it shall mean post-weld heat treatment.
From: material...@googlegroups.com [mailto:material...@googlegroups.com ] On Behalf Of Marat Nurbekov
Sent: Wednesday, April 16, 2014 8:09 AM
To: material...@googlegroups.com
Subject: [MW:20597] WPS as per API 650--HI Dear Members,
Could you help me? I work in project for Crude Oil Tank. The tank shall be constructed as per API650 and now I have some following doubts:
1) As you know WPS for API 650 has to be qualified as per ASME IX CODE and as per this code PWHT is essential variable but what about Thermal Stress Relief which is required as per API 650?
Shall I qualify WPS with Thermal Stress Relief or Thermal Stress Relief shall be performed when it is required as per API 650
2) For Crude Oil Tank shall be constructed Fire water pipe system and Drainage system. Company is going to use a plastic pipe material but there are not any notes regarding plastic materials in ASME IX and API 650.
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