Materials & Welding

Hi Israr,   Regarding the heat treatment for lined vessel you can refer ASME SEC. VIII Div. 1 section UCL 34 and for examination of stainless lining refer UCL 36.     From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ali Asghari Sent: December 30, 2008 1:54 PM To: materials-welding@googlegroups.com Subject: [MW:1430] Re: PWHT Requirement for clad plate vessel   Hi please reply these question. how much the thickness of lining? what is the material of shell?   From: israr <ahmedisrar.nm@gmail.com> To: Materials & Welding <materials-welding@googlegroups.com> Sent: Thursday, December 25, 2008 1:44:00 PM Subject: [MW:1422] PWHT Requirement for clad plate vessel Dear Friend, i have a vessel of 70 mm thick with internal lining of ss 316L plate. I am not getting how to carryout heat treatment after welding of internal lining, I hav...

Hi please reply these question. how much the thickness of lining? what is the material of shell? From: israr <ahmedisrar.nm@gmail.com> To: Materials & Welding <materials-welding@googlegroups.com> Sent: Thursday, December 25, 2008 1:44:00 PM Subject: [MW:1422] PWHT Requirement for clad plate vessel Dear Friend, i have a vessel of 70 mm thick with internal lining of ss 316L plate. I am not getting how to carryout heat treatment after welding of internal lining, I have suggested to use clad plate but there may chances to open clad during heat treatment. please help. Regards Israr Ahmed Sr. Engineer QA/QC --~--~---------~--~----~------------~-------~--~----~ 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/ The views expressed/exchnaged in this group a...

Gap should be given before fit up so that during welding there is shrinkage or expansion of the pipe and also RT should be performed in order to check wether there are any defects or cracks caused during  welding on the weld.If it is a pressure part it is compulsory to perform RT.       with regards Durrga Prasad From: tong tong <tong2je@gmail.com> To: materials-welding@googlegroups.com Sent: Friday, December 26, 2008 7:05:31 PM Subject: [MW:1428] Re: ASME B31.3-2006 Ed. Fig. 328.5.2.c Purpose of the gap is to allow the expansion of piping and fitting during welding. If there are no gap between piping and fitting may be can cause distortion. For my opinion, RT is not suitable for fillet weld but may be your client just want to ensure whether the gap is there or not. Regards, SBS On Thu, Dec 25, 2008 at 5:34 PM, Jivan Dhamane < jivanadhamane@yahoo.co.in > wrote: Dear Friends   As per ASME 3.31.3 gap is given at the time of fit-u...

Purpose of the gap is to allow the expansion of piping and fitting during welding. If there are no gap between piping and fitting may be can cause distortion. For my opinion, RT is not suitable for fillet weld but may be your client just want to ensure whether the gap is there or not. Regards, SBS On Thu, Dec 25, 2008 at 5:34 PM, Jivan Dhamane < jivanadhamane@yahoo.co.in > wrote: Dear Friends   As per ASME 3.31.3 gap is given at the time of fit-up and offcurse after weding that gap will be less than 1.5 mm because of  shrinkage due to welding heat. the meaning of RT is nothing but radiography test and i think your client might have asked you to perfom Rt to check whether 1.5mm gap has been provided or not not rejected. Regards,   Jivan Dhamane --- On Wed, 24/12/08, T. Rizal H. < aatkho@gmail.com > wrote: From: T. Rizal H. < aatkho@gmail.com > Subject: [MW:1419] Re: ASME B31.3-2006 Ed. Fig. 328.5.2.c To: materials-welding@googlegroups....

Dear All,                   I have tank with shell course thickness of 23.4mm.Shell course above and below this is greater than 10mm.As per API 650 sect 6.1.2.2 if i cover 100% T joints RT with 10x24 film is it required to take spot RT as per section 6.1.2.2 a.Or this 100% T oints will cover the rquirements.   waiting for u r reply   regds  Nilesh Parsekar ,  QC CO-ORDINATOR (Dp Mech,API 510,API 570,AWS-CWI,NDT LEVEL2)  Belleli Energy  QATAR --~--~---------~--~----~------------~-------~--~----~ 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/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes o...

Source: HP Nov2008 --~--~---------~--~----~------------~-------~--~----~ 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/ 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. -~----------~----~----~----~------~----~------~--~---

Heat Treatment - What Is It ?         J.G. Gillissie October 1981    Category: Design/Fabrication   Summary: The following article is a part of National Board Classic Series and it was published in the National Board BULLETIN . (4 printed pages) A short time ago during a joint review of an ASME Certificate Holder, I found myself asking the question, "Do you use heat treatment?" The immediate answer was, "Oh yes." I have asked the same question many hundreds of times in a like number of fabricators' shops, knowing full well that my question was all-inclusive and covered a number of processes. Ninety-five times out of any hundred the answer I got was a straight "yes" or "no." Once in a blue moon the company representative would explain that he uses only stress relieving of weldments for those material P-numbers and material thicknesses as required by the Code sections to which...

Low Voltage Short Circuiting-GMA W         M.J. Houle January 1985   Category: Design/Fabrication   Summary: The following article is a part of National Board Classic Series and it was published in the National Board BULLETIN . (3 pages) The National Board has been frequently asked to give some guidance to gas metal arc welding (GMAW or commonly called MIG) when welding in the low voltage short circuiting (GMAW-S) mode. GMAW-S is normally a solid wire (ASME SFA-5.18) gas shielded welding type process which uses semiautomatic or automatic equipment. It is similar to the spray arc or globular arc transfer GMAW processes, the flux cored arc welding (FCAW) process, and is closely related to the submerged arc welding (SAW) process. Although, the GMAW-S has unique features. All of the related processes are very high energy processes which transfer weld metal across a continuous electric arc and generally carry a large m...

Failure Avoidance in Welded Fabricatio n         Alan W. Pense Professor, Associate Dean, College of Engineering and Applied Science Lehigh University, Bethlehem, PA Category: Design/Fabrication   Summary: The following article is a part of the National Board Technical Series. This article was originally published in the October 1988 National Board BULLETIN . (9 printed pages) Failure avoidance is the responsibility of designers, materials engineers, fabricators, inspectors, and owners all working together. Abstract In spite of well developed code and other failure avoidance procedures, failures of pressure vessels and other welded components sometimes occur. Experience with failure analysis shows that many problems could be avoided by better communication between engineers of different disciplines early in the production process. With a vessel failed in hydrostatic testing as an example, the interaction between engineers t...

Welding Symbols: A Useful System or Undecipherable Hieroglyphics ?         Bill Green Former National Board Consultant Retired Professor Emeritus in Welding Engineering, The Ohio State University Winter 1996   Category: Design/Fabrication   Summary: The following article is a part of National Board Classic Series and it was published in the National Board BULLETIN . (6 printed pages) Welding symbols, when properly applied to drawings and, as importantly, when correctly interpreted, offer a potentially convenient way of controlling the welding of a particular joint. The need for consistency in both the application of welding symbols to engineering drawings, and the accurate interpretation by personnel directly involved in manufacturing or construction, led to the development of a standard for these activities. The current American standard for welding symbols was originated by the American Welding Society and approv...