Skip to main content

Re: [MW:7794] Separation of joint

By Materials & Welding
Hi,
You should do radiograph at that joint.I think its a 'T' Joint.(All 'T' joint shall be radiogrphed,it maight be cover long or circum. when you do RT)
Thanks & Regards,
 
(Karthik)
Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282


--- On Mon, 10/25/10, Ahmed Husain <ahmraha@yahoo.com> wrote:

From: Ahmed Husain <ahmraha@yahoo.com>
Subject: Re: [MW:7781] Separation of joint
To: materials-welding@googlegroups.com
Date: Monday, October 25, 2010, 6:36 PM

Mr. Limesh,Thank you very much for your prompt reply. I had referred that paragraph. But it was to not clear to me if same para can be applied in present situation where longitudinal seams of two fusion welded pipe are  at same plane at circumferential joint. There is no separation between.So as per your interpretation, same paragraph is applicable. Correct me if I am wrong.
 
Ahmed Husain
Mob-0547170325


From: limesh M <limesh78@gmail.com>
To: materials-welding@googlegroups.com
Sent: Mon, October 25, 2010 6:47:27 AM
Subject: Re: [MW:7770] Separation of joint

Dear Mr.Ahmed,
 

As per Saudi Aramco Engineering Standard (SAES-W-011 Welding requirement for onplot piping) the following clauses are applicable.There is no such kind of criteria in ASME B31.3.

 

11.16   Weld encroachment and minimum distance between welds.

The requirements for minimum separation between adjacent welds are listed in 11.16.1 and 11.16.2.  The distances shall be measured between the edges of the adjacent cap passes.  These restrictions do not apply if one of the welds has been postweld heat treated prior to making the second weld or both welds have been postweld heat treated and inspected.

11.16.1   The minimum distance between parallel butt welds shall be 20 mm or three times the wall thickness of the joint, whichever is greater.

11.16.2   Pressure containing welds (structural components and reinforcing pads are exempt) shall be separated from other pressure containing welds by no less than 20 mm or three times the joint thickness, whichever is greater.  This requirement is intended specifically for nozzles and other attachments that are added onto or adjacent to an existing butt joint.  Hot tap split tee end welds which cross the pipe longitudinal seam are exempt.  Radiography of the butt welds is required for situations in which the minimum separation is not achieved.  For joints other than butt welds, other appropriate inspection methods shall be used, depending on the geometry and material.

 

 

Regards,

 

Limesh

 

On Sun, Oct 24, 2010 at 3:10 PM, Ahmed Husain <ahmraha@yahoo.com> wrote:
Dear All,
 
During fit-up of two spools of SS304, It was observed that logitudinal seams of pipe are coming face to face, means there is no separation between long seams of large dia pipe. Is there any criteria stated in asme B31.3  or Aramco standard in this regard.
 
Regards,
 
Ahmed H.
 

 

--
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.

--
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.

--
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.

--
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.

Comments

Post a Comment

Popular posts from this blog

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

By Materials & Welding
Hi,  You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this.  Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime.  Again, these simulated no. Of cycles shall be specified in MTC.  The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case).  One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example.  In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
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