Skip to main content

Re: [MW:35372] ASME B31.3 2012 vs 2022 different in pwht

By Materials & Welding
The ASME B31.3 code underwent significant updates from 2012 to the 2022 edition regarding 
preheating and PWHT.

1. 2012 edition mandated preheating to 10 deg. C before welding while the 2022 edition emphasizes 
    more stringent requirements based on material and thickness, chemical composition, and service 
    conditions allowing for tailored preheat strategies depending on specific welding scenarios in 
    preventing weld hydrogen induced cracking. a minimum of 120 to 150 deg. C is typically required 
    for high strength steels, depending upon thickness.
        
2. In the 2012 version, PWHT a]was required for certain materials based on thickness. The 2022 
    edition introduces more flexibility, permitting exemptions under specific conditions, provided 
    that adequate preheat is applied and service experience supports such decisions. The PWHT is 
    mandatory particularly for CS and Low Alloy Steels along with defined procedures for conducting
    PWHT, such as temperature control during heating and cooling phases. These changes aim to enhance
    safety and reliability in process piping systems.
    C Sridhar
--------------------------------------------------------------------------------------------------------------------------------




On Mon, 23 Dec 2024 at 19:48, vignesh Dhamoderan <vikkismithsmith@gmail.com> wrote:
Hii, 

Any one explain what is difference in ASME B31.3 2012 vs 2022 different in pre heating and PWHt 


Thanks 
Vignesh 

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/materials-welding/CAFm2zHv8F-UEKK45vHOVj8qgdHTffm%2Bg_O_Y-1pmpBi2udKnHw%40mail.gmail.com.

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/materials-welding/CAHo%3DYigSKDq24US9CkjBw7MEXRUw%3D%2B%3DQ_GhwDfmB4owG6Lc_FA%40mail.gmail.com.

Comments

Post a Comment

Popular posts from this blog

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more

Re: [MW:10788] ON PLOT PIPING & OFF PLOT PIPING

By Materials & Welding
Piping systems involved for the flow lines and gathering lines from the well head isolation valve to the production facility or processing plant isolation valve are determined as OFF PLOT. ON PLOT defines piping system in the processing plant and production platform. ANSI/ASME B31.4 applies for off plot piping system. B31.4 allows the use of either API 1104 or ASME section IX (as appropriate). However, occasionally, a very small system such as piping within 500 feet of a processing plant (some client also said 400 feet) may be declared B31.3 rather than B31.4. When B31.3 is invoked, only ASME Section IX is used. before you decide which code to use for welding procedure and/or welder qualification for pipe welding, you have to know the design and construction code applicable to the system. Please read far enough into scope and diagram illustrating the application of either B31.3 and B31.4 hope this helps rgds 2011/4/21 pradip kumar sil < pradipsil@gmail.com > Dear all, ...
Post a Comment
Read more