Prior to 2014, ASME B31.3 required carbon steel welds be post weld heat treated (PWHT). However, with recent amendments of this Code allowing exemptions when weld thickness exceeds certain limits, post weld heat treatment becomes optional in certain instances. This paper will analyze the arguments used to justify exemptions, showing many to be invalid or …

Loe edasi “Comparison of ASME B31 3 PWHT Requirements”

The B31.3 Code defines rules for piping systems used in oil refineries, chemical, paper & pulp, semiconductor manufacturing facilities, power generation stations and similar processing plants. This document specifies requirements for designing, fabricating, assembly erection examination inspection & testing of process piping. An EPRI report (Ref 1) has recommended that the PWHT temperature for 1-1/4 …

Loe edasi “B31.3 PWHT Table”

Post-weld heat treatment (PWHT), commonly referred to as stress relief, involves heating and cooling welds to alleviate residual stresses that could otherwise lead to cracking and fractured welds. PWHT involves specific rates, tolerances and times at temperature that Wisconsin Oven furnaces offer for maximum stress-relief. Annealing, normalizing and stress relieving are just some of its …

Loe edasi “A Qualified PWHT Company Is Essential For Your Project”

Since 2014’s edition of ASME B31.3, thick carbon steel pipe has been exempted from post weld heat treatment (PWHT) requirements with only multi-pass welding required and no preheat requirement necessary. There have been concerns raised that such exemptions may be unsafe. This paper, sponsored by EPRI and written by RRAC team members, is intended to …

Loe edasi “ASME B31.3 Post Weld Heat Treatment Requirements For Carbon Steel Pipe”

This week marked the debut of the Professional Women’s Hockey League season and its rules will differ significantly from those seen in the National Hockey League (NHL). While teams in NHL receive two points for winning an overtime or shootout game, while in PWHL they only get credit if their victory came during regulation time. …

Loe edasi “The Shootout and Jailbreak Goal in PWHL Hockey”

ASME Section VIII, Division 1 is an important engineering standard that provides clear guidelines for creating, inspecting, and certifying pressure vessels. This contributes to standard engineering practices while improving safety and efficiencies across different industries. Post weld heat treatment (PWHT) is a controlled process designed to eliminate residual stresses in welded materials and is defined …

Loe edasi “Post Weld Heat Treatment (PWHT) Requirements As Per ASME Section VIII, Division 1”

ASME VIII jagu sisaldab põhjalikke nõudeid selliste põletatavate või põletamata surveanumate projekteerimisele, valmistamisele, kontrollile, katsetamisele ja sertifitseerimisele, mille sisemine või väline töörõhk ületab 15 psig. Lisaks sellele on käesolevas standardis esitatud kohustuslikud ja mittekohustuslikud lisad, milles kirjeldatakse üksikasjalikult täiendavaid projekteerimiskriteeriume, mittepurustava kontrolli standardeid ja kohaldatavaid vastuvõtustandardeid. Osa 1 Nagu selle ...

Loe edasi “ASME Section VIII Div 2 PWHT Requirements”