Distance between welds

[manpreet]

Dear All

My case is:-

code of construction- ASME B31.3
LPG/LNG pipeline

For Pig signaller, we have to weld a barred tee in the pup piece attached with valve.

pup piece material- API 5L X60 PSL2
barred tee- ASTM A860 WPHY 60

length of pup piece is 125 mm. Kindly find the attached drawing for welding connection.

Acc. to Australian std distance between welds should be 6 times of thickness, in this case we r not able to weld.
PLS confirm looking at the drawing, can the welding be performed?

[sethurama lingam]

Dears,

As per Sec VIII ,UW-9(d)
(d) Except when the longitudinal joints are radiographed
4 in. (100 mm) each side of each circumferential welded
intersection, vessels made up of two or more courses shall
have the centers of the welded longitudinal joints of adjacent
courses staggered or separated by a distance of at
least five times the thickness of the thicker plate.

 

Code  given only the distance that shall be maintained between Long seams of adjacent shell sections. For Distance between Butt welds and fillet welds, refer to Customer/Client specifications.

Generally Used in Process Piping/power piping as 1.5 D or 6 times of thk as per the condition which one is higher ,there is no way take the 100% Radiography of both joints won,t not meet above condtion.

Regards,

 

Sethuramalingam.P

ACPCPL

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Regards

Sethu Ramalingam.p

[Jimmy Nielsen]

Hi

In our internal standards we have 30mm from HAZ to HAZ in special cases. 

You can make hardness test if you are in doubt, the hardness shall be lower then the hardness recorded in the PQR

good practice is 75 to 100 mm

Regards, jimmy

[B.Vaithiyanathan]

Hi

 this is for your info

One of my client specification allows the Minimum distance between(toe to toe) weld can be 5 times the wall thickness provided both joint can be radiographicaly acceptable.If in case of sour service Hardness check on weld ,HAZ & Base metal is required.

 

vaithiyanathan

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With Best Regards

B.Vaithiyanathan

[A D]

Hi,

         If we don't have any client specification, where can we get this type general detail. Is there any book for general engineering practice?

 

Louis

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From: B.Vaithiyanathan <pavai...@gmail.com>
To: material...@googlegroups.com
Sent: Sun, 13 June, 2010 11:48:55 PM
Subject: Re: [MW:5577] Distance between welds

[GPS Quality]

There seems to be few ambiguity in the information provided.

 

1. Given Design code is ASME B 31.3 & item is a part of LPG/LNG Pipeline scrapper/ signaller. Normally these are designed either as per ASME B 31.8/31.4 or Sec VIII div 1 or 2.

 

From the drawing, for 8"x 4" barred tee, for the branch connection (4" size), pup piece material is ASTM A 333 Gr 6 & I believe, the thickness is 13.59mm (considered minimum WT as shown in the drawing) & the length is 125mm. (whereas in you statement it is mentioned as API 5L X60 PSL2 created confusion).

 

If the client species the minimum distance required 6xWT, pup piece required is 13.59mm X 6 = 80.94mm < 125mm length is provided- Where is the problem?

 

If you are mentioning about the 8" pup piece attached the main (run pipe) with WT 15.9mm, the minimum distance required is 15.9x6= 95.4mm only < 125mm (actual provided in the drawing is 400mm, whereas you had mentioned 125mm created confusion).

 

 To me, the pup piece can be welded (to barred tee) with out any problem & within client specification.

 

Regards,

Sanjeevan

 

 

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[AGUSTIN JIMENEZ]

Dear colleagues, I have a query them.
 
For the inspection of tubular structures (section square or rectangular), which is the acceptance criteria for loss of thickness and standard that applies? . This structure is 12 years old, made in the open.
 
Many would know thank
 
Greetings,

Agustin

 

 

[john rodrigues]

Austin,
May I know what is application of structure?
Regards.
JohnR

On Wed, 16 Jun 2010 08:53:04 +0530 wrote

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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.
>

John Rodrigues

[AGUSTIN JIMENEZ]

Hello Jhon

 

Yes, we are doing inspection of a church structures and need know how many is the thickness loss that i can accept.

 

Agustin

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De: john rodrigues <johnrod...@rediffmail.com>
Para: material...@googlegroups.com
Enviado: mié, junio 16, 2010 4:19:52 AM
Asunto: Re: [MW:5613] structures acceptance criteria for loss of thickness

[ravishankar menon]

BS EN 10219-2-2006

 

Regards,

 

Ravimenon

 

 

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From: AGUSTIN JIMENEZ <agum...@yahoo.com>
To: material...@googlegroups.com
Cc: INSPECTORES DE EQUIPOS ESATICOS <inspectores_eq...@gruposyahoo.com>
Sent: Wed, 16 June, 2010 5:52:16 AM
Subject: [MW:5605] structures acceptance criteria for loss of thickness

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