[MW:7923] Re: [MW: 7921] MW: 7874- PWHT

Dear Pradip

Is there standard formula to calculate throat Thichness for sit-on / sit-in branch connections?

Thanks
With Best Regards

Ganesan
QA Engineer
Mobi - 1707
HP - 9189 6531

-----Original Message-----
From: "pgoswami" <pgoswami@quickclic.net>
To: materials-welding@googlegroups.com
Date: 29/10/2010 11:58
Subject: [MW:7921] MW: 7874- PWHT

Redouane,

In B-31.3 code,for branch connection PWHT criteria is as follows:-

331.1.3 Governing Thickness for Heat Treatment.When components are joined by welding, the thickness to be used in applying the heat treatment provisions of Table 331.1.1 shall be that of the thicker component measured at the joint, except as follows:

(a)In the case of branch connections, whether anintegral part of a branch fitting or attached as a reinforcingpad or saddle, heat treatment is required, as follows:-

( 1)Heat treatment is not required for P-No. 1 materials when weld throat thickness is 16 mm ( 5⁄8 in.) or less, regardless of base metal thickness.

(2)not required for P-No. 3, 4, 5, or 10A materials when weld throat thickness is 13 mm (1⁄2in.) or less, regardless of base metal thickness, provided that not less than the recommended preheat is applied, and the specified minimum tensile strength of the base metal is less than 490 MPa (71 ksi).

For weldolet, the weld joint would be a groove and fillet weld. Hence the throat thickness is important. Assuming the material of construction is Carbon Steel,if the throat thickness exceed the above , PWHT is necessary.

Thanks.

Pradip Goswami,P.Eng.
Welding & Metallurgical Specialist & Consultant
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net

-----Original Message-----
From: materials-welding@googlegroups.com [ mailto:materials-welding@googlegroups.com] On Behalf Of Brl Pp
Sent: Wednesday, October 27, 2010 7:04 AM
To: Materials & Welding
Subject: [MW:7874] PWHT

Good morning,

Please see below the data of piping line for erection:

- Diameter of pipe: 48"

- Produced: liquefied natural gas.

- Piping class: D41A

- Piping thickness: 38mm.

- Weldolet thickness : 15mm.

- Design code: ASME B31. 3. 2008 Edition.

- PWHT: By code.

According to your experience, for this case we use the PWHT?

If yes, please share your experience. Thanks in advance.

My best regards.

Redouane (Project engineer)
Algeria

--
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.

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

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...

Materails FAQs

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...

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

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...

Materials & Welding

Search This Blog