Skip to main content

[MW:576] Re: Heat treatment of a jacketed vessel

By Materials & Welding
Also, in order to reduce / eliminate thermal stresses - control the rate of heating and cooling. The maximum temperature between the thickest and thinnest parts undergoing PWHT should be kept to within 50C
 
regards,
 
Jayesh




From: pshrikant@mis.ae
To: materials-welding@googlegroups.com
Subject: [MW:569] Re: Heat treatment of a jacketed vessel
Date: Wed, 13 Feb 2008 07:51:53 +0500

It will be better if the vessel is supported on vessel supports (integral vessel supports) during PWHT.
 
At PWHT temperature, if the vessel is supported on other temporary supports (on jacket), the jacket may buckle in due to heavy vessel weight.
 
Thanks,
 
Shrikant
 
----- Original Message -----
Sent: Tuesday, February 12, 2008 16:30
Subject: [MW:568] Re: Heat treatment of a jacketed vessel

During PWHT keep open inlet and out let of jackets. Ensure that air pressure inside jacket is atmospheric.
As you mentioned shell thickness 80mm and jacket with 12/14mm.
Take care and support the equipment properly.

On Jan 31, 2008 9:37 PM, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:
In a worst case scenario what will happen when a large vessel with jacket subjected to PWHT? (core thickness of up to 80mm and jacket thickness of 12/14mm, both are made of SA516)
 
What are the precautionary measures?  Please share your views interms of distortion, bulging, vaccum, entrapment etc.
 
<BR

Maritime Industrial Services Co. Ltd. Inc. (MIS)
Corporate Office: Oilfields Supply Center, JAFZA, P.O.Box 11791, Dubai, UAE. Tel: +971-4-883-7040, Fax: +971-4-883-6484
Sharjah Operation: P.O. Box 4596, Sharjah, UAE, Tel: +971-6-528-5345 Fax: +971-6-528-5820 Website: www.miscoltd.com

The content of this e-mail together with any attachments, statements and opinions expressed herein contain information that may be private and confidential, and are intended for the named recipient/s of the mail only.


--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
-~----------~----~----~----~------~----~------~--~---

Comments

Post a Comment

Popular posts from this blog

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

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