Skip to main content

Re: [MW:25449] PWHT on non PWHT vessel

By Materials & Welding
These vessels are designed to ASME Sec VIII Div 1, but not code stamped. 

Regards,

Vinod Bhatt

Sent from my iPhone

On 25-Sep-2016, at 10:16 PM, vnbhatt@gmail.com wrote:

Dear Sir,

I stated that, the vessels are mix of stainless steel - SS316 and carbon steel - SA 516 Gr 70, handling compressed natural gas. 

We require to add small gussets, to stiffen small bore (below 50 mm) nozzles for drain & vent, as some of these failed due to vibration. 

Regards,

Vinod Bhatt

Sent from my iPhone

On 25-Sep-2016, at 9:34 PM, Raghuram Bathula <raghurambathula@gmail.com> wrote:

what is MOC, code of construction, type of repair, service?  pl provide detailed info...
temper bead might be an alternative

On 24 September 2016 at 23:49, <vnbhatt@gmail.com> wrote:
Respected members,

One of site has non PWHT carbon steel and stainless steel pressure vessels. As they are undergoing some repair, overseas engineer suggested PWHT on repaired portion for relieving the stress and to deal with HAZ.
Doing local PWHT imposed a question that during manufacturing the WPS PQR and the welding electrode employed was okay for non PWHT job. Doing the local PWHT would necessitate revised WPS PQR and the electrode  this can't be done as circ. seam is covering portion of repair. Thus we are in dilemma as to what is the way out.
Being week off I request welding and code expert to suggest their opinion.

Thank you all.

Kind Regards,

Vinod Bhatt

--
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
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 post to this group, send email to materials-welding@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CADxVub%3Dp-Ui%2BXdfNjkxdn8V9dkHdDWSSAgVbxmodoRq8-bHjZw%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

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