Re: [MW:8308] Possibility of hydotesting of the components of vessel

Hi,

When i look at the drawing,i think you dont need to do PWHT since it is a nozzle(2") to flange welding.I think your welding joint is fillet or groove with fillet.If it is so,and the throat thickness is not exceed 13mm,you dont need to do PWHT.

If it is of groove welds(butt joints),the nominal weld thickness exceeds 38mm need PWHT.

Anyhow,without joint type i can't conclude this now.

Please check your joint design and weld.If it is same as i stated then you dont need to go for PWHT.

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 Wed, 11/17/10, THAKSEN INGOLE <t_ingole@yahoo.co.in> wrote:

From: THAKSEN INGOLE <t_ingole@yahoo.co.in>
Subject: [MW:8302] Possibility of hydotesting of the components of vessel
To: "material welding" <materials-welding@googlegroups.com>
Date: Wednesday, November 17, 2010, 9:23 PM

Dear All

I would like to know if it is possible to do hydrotest of individual component of a vessel. A typical case is as below.(refer the attached sketch for quick reference)

we have vessel for Aramco filters, Designed as per ASME Sec VIII Div.1 and is U stamp. The filter has 12" Standard CAP welded at one end of the 12" pipe and a top body flange 12"WNRF 300# welded at the other end of the pipe, with a 12"BLRF 300# blind flange and a 2"vent nozzle (LWNRF 300#)on the top of the blind flange.
The 2"vent nozzle is welded with a "sent in" configuration to the blind flange. so this has generated the requirement of PWHT only for the blind welded along with vent nozzle , as the 12"BLRF 300# has a thickness of 50.8mm and for SA-105 material the PWHT becomes mandatory above 38mm. The vessel is stamped as PHT (partial heat treatment)

My problem.
We have forgot to do PWHT for the blind flange welded to the 2"vent nozzle and the hydrotest is already performed.

Now we will do the PWHT for the blind flange welded to the 2"vent nozzle and hydrotest only these parts seperately by providing a dummy vessel arrangement to support the hydrotest of the these components . we do not want to hydrotest the complete vessel as we would like to go for blasting and painting for these vessel because of large quantity.

Is the above meeting the code requirement.

Regards
Thaksen

--
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