Materials & Welding: October 2012

Wednesday, October 31, 2012

Re: [MW:15827] PWHT of Cladded Equipment

for pre and post heating of clad no other special equipment required.

What is base metal and what material is clad layer. if clad layer is of Inconel, no much worries. If clad layer is of SS again which grade ? if 321 or 347 than again no worries. if its L grade of SS, due to low range of carbon, carbaide formation is avoided at large extent. If it is normal SS grade, i.e. 304 or 316, then carbaide formation may take place.

Another way is to provide inert atmosphere (argon during heating, due to cost constraint Nitrogen can be used),

The best way is to qualify PQR with corrosion test with simulated pre / post Heating.

I am not sure Mr. Shashank want to know about just heating methods.

In case of PWHT of any clad its advisable to apply chalk paste to avoid discolorisation of clad material.

On 30 October 2012 09:45, Hemant Solanki <shm8324@gmail.com> wrote:

I have gone through PWHT procedure followed by Vendor in one of our Project for cladded equipment. even though SS cladding is there vendor has kept holding temperature upto 620°C (as per CS base material requirement). whether sensitization phenomenon should look into this or not. Because at this much temperature SS cladding may get sensitize and its property may get inferior.

As per UCL-34 cautionary note
Postweld heat treatment may be in the carbide-precipitation range for unstabilized austenitic chromium–nickel steels, as well as within the range where a sigma phase may form, and if used indiscriminately could result in material of inferior physical properties and inferior corrosion resistance, which ultimately could result in failure of the vessel.

Can any body tell how to take care in such situation ?

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C. K. Purohit

+968 92840112

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RE: [MW:15824] PIPE- THICKNESS VARIATIONS

Kindly refer Table 9 (Tolerances for wall thickness) in API 5L (2004).

Regards

Devang Majithia

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Nandesh Kumar
Sent: Wednesday, October 31, 2012 12:03 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:15820] PIPE- THICKNESS VARIATIONS

Biplab,

The thread/post is about API 5L. See the table J.4; foot note b

Respectfully,

Nandesh Kumar A

--- On Tue, 30/10/12, Biplab Pal <biplab.mech@googlemail.com> wrote:

From: Biplab Pal <biplab.mech@googlemail.com>
Subject: Re: [MW:15814] PIPE- THICKNESS VARIATIONS
To: materials-welding@googlegroups.com
Date: Tuesday, 30 October, 2012, 12:51 PM

Dear Mr. Devang,

Can you please specify, where in piping code indicate that the thickness variation should be between + or - 12.5%

On Tue, Oct 30, 2012 at 11:48 AM, Devang Majithia <dmmajithia@gnfc.in> wrote:

Code is allowing variation of (+)12.5% or (-) 12.5% of specified thickness. Similar kind of issue had occurred with our company. Piping was manufactured as per API 5L Gr. B. After referring API 5L specification we came to know that code is allowing variation of 12.5% on lower and upper side. For other ASME manufactured pipe variation is identical.

Hope info will be helpful to u

Regards

Devang Majithia

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of GOPU NAIR
Sent: Sunday, October 21, 2012 4:26 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:15729] PIPE- THICKNESS VARIATIONS

Dear Mr. Kumar

It is possible for either cold drawn or hot drawn pipe to have thickness variation due to process itself, hence the tolerance is stated in the Codes. Unless your customer specification is very clearly stating about the thickness requirement as 9.53 mm minimum, the pipes within Code tolerances can be accepted. If you so desire, please ask your design department to recalculate the minimum required thickness to support your decisition to accept the pipes.

Regards

Gopu

--- On Sat, 20/10/12, Kumar kerala <sk7920541@gmail.com> wrote:

From: Kumar kerala <sk7920541@gmail.com>
Subject: [MW:15723] PIPE- THICKNESS VARIATIONS
To: materials-welding@googlegroups.com
Date: Saturday, 20 October, 2012, 2:48 PM

Dear members,

We have inspected some pipes (sizes from 12", 16" & 24" all schedule standard (9.53mm))....but it was observed that the thickness upon measurement is from 9.26mm to 9.3mm. the material is API-5L, Gr.B (PSL-1). eventhough the thicknesses are within the API- mill manufacturing tolerences, these are not matching with the Schedule required by drawings/client specifiactions. normally the physical thicknesses on pipe seen as more like 9.6, 9.7mm etc or even up to 10mm....but if it falls below the thickness written on the pipe itself, how could we assess this issue? opinions from all corners are appreciated. also, this may be very common issue with others, kindly share.

Thanks in advance

Kumar.

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Thanks & Regards
Biplab Pal
Welding Inspector

E-mail: biplab.mech@gmail.com

Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. Myself accepts no liability for any damage caused by any virus transmitted by this email.

Re: [MW:15823] HST Pressure variation in two pressure gauges

Dear Dasari,

1. Yes there will be variation in pressure gauge reading when they are fitted at different heights because of the general static head difference, Generally for 10 meter static head difference the pressure difference will be 1 bar (14.5 psi).

2. Normally the first step can be 50% the test pressure and then pressure can be increased to the final test pressure by another 5 steps each compensating 10% totaling 100% by 6 steps.

3. I think socket weld is a circumferential weld as it makes a complete circumference.

On Wed, Oct 31, 2012 at 10:03 AM, srikanth dasari <dasarosyis@gmail.com> wrote:

Dear experts,

1.while performing a Hydro static test in a pipe line/spool at two different elevation for a continuous one line ,one pressure gauge has found one reading at one elevation and another pressure gauge has found another reading at another elevation how much can be the pressure variation in the Two pressure gauges as temperature is also a factor how much temp variation can be allowed as per code???

2.How much percentage of increase in testing pressure can be increased in testing a pipe line for HST for a specific Testing pressure given in the Drawings???

3.Please clarify whether Socket weld is Circumferential welding or not define types of circumferential joints???

DASARI SRIKANTH

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Thanks & Regards

Srirammadhan

Piping/painting inspector

Great drill Chaaya

Great Ship

Hamriyah Free zone, UAE

[MW:15822] Query for correct interpretation of Clause No.QW-407.2 of ASME Section IX

Dear Experts,

Please refer trail official interpretation of ASME Section IX.
Interpretation: IX-04-15

Subject: QW-407.2, Base Metal Thickness Qualification and QW-407.2, PWHT Temperature and Time Range
Date Issued: December 22, 2004
File No: 04-1595

Question (1): Will a procedure qualification test coupon on 1.5 in. thick P-No. 1, Gr. 2 material and post weld heat treated at 1100 deg. F. for 1.5 hours with supplementary essential variable requirements met, support a WPS with supplementary essential variable requirements for production welding on 8 in. thick P-No. 1, Gr. 2 material that is PWHT at 1100 deg. F. for 3.5 hours?

Reply (1): No.

Question (2): Based on the conditions stated in Question 1, could the PWHT time on the 8 in. thick weldment be increased to 4 hours and 10 minutes at 1100 deg. F. and still be in compliance with Code requirements?

Reply (2): No.

As per my opinion

Answer as 'NO' is correct because requirement of at least 80% soaking time on test coupon is not meeting in both the cases.

Case-1 : Soaking time on test coupon as 1.5 Hr is much less than 80% of 3.5 Hr soaking time given to production weld

Case-2 : Soaking time on test coupon as 1.5 Hr is much less than 80% of 4.0 Hr & 10 Min. soaking time given to production weld

I have also seen previous expert replies for same subject as mentioned below

Reply of a

Because the supplementary essential variables must be met, the proposed WPS is not allowed - i.e. in QW-407.2 there is a maximum limit on time at temperature. Specifically, "The procedure qualification test coupon . . . at least 80% of the aggregate time at temperature."

Thus the maximum time (Tmax) at temperature is : (Tqual/Tmax) X 100 = 80

Or Tmax = Tqual X ( 100/80) = 1.5 hr X (5/4) = 1.875 hours

So the PQR does not have a long enough hold time to support the proposed WPS's 3.5 hour hold time.

John A. Henning
Senior Welding & Materials Engineer

Please let me know out of following two interpretations, which interpretation is correct ?

1) QW-407.2 (including at least 80% of the aggregate times at temperature(s) ) is mean to specify minimum 80% of total aggregate time at temperatures for PWHT for established PQR

OR

2) QW-407.2 is mean to specify Maximum 1.25 time of total aggregate time at temperatures for PWHT for established PQR.

Kindly clarify.

[MW:15821] Re: service wise requirement for PWHT

Dear Friends,

How do you think about induction heater for PWHT.

We supply induction heater for PWHT. Pls check the pic.

1. Around the insulation blanket on the pipe.

2. Around the induction coil on the insulation blanket. (10 ~ 15 turns will be ok)

3. Connect the induction coil on the induction heater.

4. Connect the K type thermocouple on the induction heater. Setting the heating process. The machine will ok.

5. Start the induction heater then It will work well.

It has many advantage compare with resistence heater:

Quickly heating speed. It can reach 650 degree C within 30 minutes. It will save many times compare with resistence heater.
Electrical Power Saving: It can save more than 50% electrical power compare with resistence heater.
Stable for long time using: The equipment and induction coil are more stable compare with resistence heater
Easy to operate and move and so on.
The control system is touch PLC screen.

在 2009年7月4日星期六UTC+8下午10时47分39秒，sonu写道：

Hello to all of you.
Dear friends I have one query which I like to ask you
As per table 331.1.1 of ASME B31.3,it is mentioned here the
requirement of PWHT as per thickness and tensile strength for
mentioned materials.But how can I get information according to service
vise? This requirement is depend on project specification but i want
to know that, on which basis they calculate this requirement? Which
factors will consider during calculation? and how this factors affect
during service?
Regards
SADIQUE

Re: [MW:15820] PIPE- THICKNESS VARIATIONS

Biplab,

The thread/post is about API 5L. See the table J.4; foot note b

Respectfully,

Nandesh Kumar A

--- On Tue, 30/10/12, Biplab Pal <biplab.mech@googlemail.com> wrote:

From: Biplab Pal <biplab.mech@googlemail.com>
Subject: Re: [MW:15814] PIPE- THICKNESS VARIATIONS
To: materials-welding@googlegroups.com
Date: Tuesday, 30 October, 2012, 12:51 PM
Dear Mr. Devang,

Can you please specify, where in piping code indicate that the thickness variation should be between + or - 12.5%
On Tue, Oct 30, 2012 at 11:48 AM, Devang Majithia <dmmajithia@gnfc.in> wrote:
Code is allowing variation of (+)12.5% or (-) 12.5% of specified thickness. Similar kind of issue had occurred with our company. Piping was manufactured as per API 5L Gr. B. After referring API 5L specification we came to know that code is allowing variation of 12.5% on lower and upper side. For other ASME manufactured pipe variation is identical.

Hope info will be helpful to u

Regards

Devang Majithia

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of GOPU NAIR
Sent: Sunday, October 21, 2012 4:26 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:15729] PIPE- THICKNESS VARIATIONS

Dear Mr. Kumar

It is possible for either cold drawn or hot drawn pipe to have thickness variation due to process itself, hence the tolerance is stated in the Codes. Unless your customer specification is very clearly stating about the thickness requirement as 9.53 mm minimum, the pipes within Code tolerances can be accepted. If you so desire, please ask your design department to recalculate the minimum required thickness to support your decisition to accept the pipes.

Regards

Gopu

--- On Sat, 20/10/12, Kumar kerala <sk7920541@gmail.com> wrote:

From: Kumar kerala <sk7920541@gmail.com>
Subject: [MW:15723] PIPE- THICKNESS VARIATIONS
To: materials-welding@googlegroups.com
Date: Saturday, 20 October, 2012, 2:48 PM

Dear members,

We have inspected some pipes (sizes from 12", 16" & 24" all schedule standard (9.53mm))....but it was observed that the thickness upon measurement is from 9.26mm to 9.3mm. the material is API-5L, Gr.B (PSL-1). eventhough the thicknesses are within the API- mill manufacturing tolerences, these are not matching with the Schedule required by drawings/client specifiactions. normally the physical thicknesses on pipe seen as more like 9.6, 9.7mm etc or even up to 10mm....but if it falls below the thickness written on the pipe itself, how could we assess this issue? opinions from all corners are appreciated. also, this may be very common issue with others, kindly share.

Thanks in advance

Kumar.

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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Please don't print this e-mail unless you really need to. Save a tree if possible. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ########################################################################## # Legal Disclaimer : mail.gnfc.in # # ------------------------------------ # # This message may contain confidential and/or privileged information. # # If you are not the addressee or authorized to receive this for the # # addressee, you must not use, copy, disclose or take any action based # # on this message or any information herein. If you have received this # # message in error, please advise the sender immediately by reply e-mail # # and delete this message. # # # # Thank you for your cooperation # ##########################################################################
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Thanks & Regards
Biplab Pal
Welding Inspector

E-mail: biplab.mech@gmail.com

Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. Myself accepts no liability for any damage caused by any virus transmitted by this email.
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Re: [MW:15819] Can we measure the Ug

Ravi,

Following is the extraction of ASTM E94:

Clause 15.2 The radiographic image of an object or feature within
an object may be larger or smaller than the object or feature
itself, because the penumbra of the shadow is rarely visible in
a radiograph.

IMO, you can not measure Ug on a radiograph using a scale. as the Ug will always be very negligible in dimension, usually less than 0.5 mm (if proper techniques are followed)

You can measure the Ug (the penumbra), only if you are making a 'deliberate' setup like large Object to film distance, large source size than the discontinuity size whose Ug is to be measured etc.

And finally, if the Ug is measurable on the film, really it is a bad quality radiograph...!!!

Respectfully,

Nandesh Kumar A

--- On Tue, 30/10/12, Vajjiravelu Ravi <vajjiraveluravi3@gmail.com> wrote:

From: Vajjiravelu Ravi <vajjiraveluravi3@gmail.com>
Subject: Re: [MW:15815] Can we measure the Ug
To: materials-welding@googlegroups.com
Date: Tuesday, 30 October, 2012, 12:24 PM

the question is how it is possible to measure the Ug, anyhow thks for your kind response

On Tue, Oct 30, 2012 at 1:33 PM, cbe swamy <cbe_swamym@hotmail.com> wrote:

Dear all,

T-274.1 Geometric Unsharpness Determination.

Geometric unsharpness of the radiograph shall be determined in accordance with:

U
g = Fd/D

where,

U
g = geometric unsharpness

F =
source size: the maximum projected dimension of the radiating source (or effective focal spot) in the plane perpendicular to the distance D from the weld or object being
      radiographed

D =
distance from source of radiation to weld or object being radiographed d p distance from source side of weld or object being radiographed to the film D and d shall be determined
     at the approximate center of the area of interest.

Please refer Sec -V ASME for more details.

Thank & Best Regards,

M Veera SAMY- Bureau Veritas.

Coimbatore

Date: Tue, 30 Oct 2012 09:39:55 +0530
Subject: [MW:15801] Can we measure the Ug
From: nagarajanqc187@gmail.com
To: materials-welding@googlegroups.com

Dear Experts,



                        Can we measure the Ug in RT interpretitation ? If Yes , How to measure tell me

with regaeds

nagu

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Vajjiravelu Ravi

Welding,Painting,NDT & ISO 9001/2008

take all steps to save our health wealth & environment.

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[MW:15818] HST Pressure variation in two pressure gauges

Dear experts,

1.while performing a Hydro static test in a pipe line/spool at two different elevation for a continuous one line ,one pressure gauge has found one reading at one elevation and another pressure gauge has found another reading at another elevation how much can be the pressure variation in the Two pressure gauges as temperature is also a factor how much temp variation can be allowed as per code???

2.How much percentage of increase in testing pressure can be increased in testing a pipe line for HST for a specific Testing pressure given in the Drawings???

3.Please clarify whether Socket weld is Circumferential welding or not define types of circumferential joints???

DASARI SRIKANTH

Re: [MW:15817] Dissimilar welding CS to DUPLEX SS

Hi,

I would use E309 for this thickness, no preheating, maximum interpass temperature is 150 deg C

Regards,
Manpreet Singh

On Tue, 30 Oct 2012 14:17:45 +0530 wrote
>Dear Experts,

In our isometric drawing shows dissimilar welding carbon steel to

duplex stainless steel ( 31254 grade ) thk is 9.52 mm. Can anybody

give me guideline to make this WPS.

Regards

Pradip

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[MW:15809] RE: Dissimilar welding CS to DUPLEX SS

Hi Pradip,

UNS 31254 is a super austenitic stainless steel, popularly known as 254SMO.
See the attached document (highlighted texts) for instructions on welding ,
between similar base metals and dissimilar welds between C.S # UNS S31254.

For welds involving PWHT advisable would be to butter the C.S, perform PWHT
followed by welding to UNS S 31254.

Thanks

P.Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario, Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net

-----Original Message-----
From: pradip kumar sil [mailto:pradipsil@gmail.com]
Sent: Monday, October 29, 2012 3:40 AM
To: materials-welding
Cc: pgoswami
Subject: Dissimilar welding CS to DUPLEX SS

Dear Experts,
In our isometric drawing shows dissimilar welding carbon steel to duplex
stainless steel ( 31254 grade ) thk is 9.52 mm. Can anybody give me
guideline to make this WPS.
Regards
Pradip

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Tuesday, October 30, 2012

[MW:15808] RE: Hardness on NACE Material

Dear Pradip,

Is the service is for upstream (offshore oil and gas) or downstream (oil and gas refining) environments.

If the service is for upstream environments then MR-0175-ISO-15156-2 requirements as stated below will be applicable. Refer Annex-A of MR-0175 for this.

Welding consumables and procedures that produce a deposit containing more than 1 % mass fraction nickel are acceptable after successful weld SSC qualification by testing in accordance with Annex B. ER-70S-2 and E-7018 will not have problem with respect to this issue. However advise would be to get the " Confirmation from the consumable manufacturer", as welding consumables meet requirements of MR-0175/ISO-15156.

Thanks.

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

Maximum acceptable hardness values for carbon steel, carbon-manganese steel and low-alloy steel welds

-----Original Message-----
From: pradip kumar sil [mailto:pradipsil@gmail.com]
Sent: Monday, October 29, 2012 7:31 AM
To: materials-welding
Cc: pgoswami@quickclic.net
Subject: Hardness on NACE Material

Dear Experts,
We are going to fabricate carbon steel to carbon steel pipe ( A-106 To A 106 Gr. B/ A-105/ A234 GR. B ) with NACE Specification as per MR-175 without POST WELD HEAT TREATMENT.
In this case how much is maximum limit of hardness in BASE METAL/HAZ & WELD MENT & where it is specified.
Can we use normal ER-70S2 filler wire & E-7018 Electrode ( Without HICC & SSIC Certificate ) Regards Pradip

Re: [MW:15810] Duplex stainless steel PQR test/Consumable requiremnet as per EIL specification

Dear Patel,

Provide ur Duplex material UNS No. to get details; for further clarification refer Sec-no.-IX; QW/QB-422

With thanks,

Ratnakar.G

On Tue, Oct 30, 2012 at 1:59 PM, Ankit PAtel <ankit.patel@orientalindia.net> wrote:

Dear Experts
Kindly give me a guideline for Duplex stainless steel PQR test requirement & Consumable requirement as per EIL specification. Also send EIL specification No./specification.

Regards
Jatin Patel

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Fw: [MW:15811] Weld Defect Photos with Chinese Sub-Titles

Mr.Roy

Thanks a lot for your help.i also need the same for overlap and arcstrike.

Thanks

----- Forwarded Message -----
From: raj susi <rjsusi@yahoo.com.sg>
To: materials-welding@googlegroups.com
Sent: Monday, 29 October 2012, 18:06
Subject: Re: [MW:15793] Weld Defect Photos with Chinese Sub-Titles

Mr.Roy Thanks a lot for your help.i also need the same for overlap and arcstrike.Thanks------------------------------ On Mon, Oct 29, 2012 4:46 AM CST (China) Roy Liu wrote: >Hi, >FYI > > >ROY >BOHLER WELDING CHINA > > > >-----原始邮件----- From: raj susi >Sent: Sunday, October 28, 2012 10:34 AM >To: materials-welding@googlegroups.com >Subject: [MW:15787] Weld Defect Photos with Chinese Sub-Titles > > >Dear friends >In my company (in Singapore)we have a lot of chinese welders and its difficult for me to explain the welddefects in chinese because they don understand english well.i have these photos wit english titles,so if anyone has these photos with english and chinese titles please forward me so that I can display on our notice board and ask them to follow. >Thanks >Raj > >-- 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/ >http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm > >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/ >http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm > >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:15812] Weld Defect Photos with Chinese Sub-Titles

Dear Valeria

yes i have it in english.

From: Valeria Vargas <vvargas@infa.com.ar>
To: materials-welding@googlegroups.com
Sent: Monday, 29 October 2012, 19:52
Subject: Re: [MW:15799] Weld Defect Photos with Chinese Sub-Titles

Do you have it in english? Thank you. Valeria De: Roy Liu <standardliu@hotmail.com> Para: <materials-welding@googlegroups.com> Fecha: 28/10/2012 22:25 Asunto: Re: [MW:15793] Weld Defect Photos with Chinese Sub-Titles Enviado por: materials-welding@googlegroups.com

Hi, FYI ROY BOHLER WELDING CHINA -----原始邮件----- From: raj susi Sent: Sunday, October 28, 2012 10:34 AM To: materials-welding@googlegroups.com Subject: [MW:15787] Weld Defect Photos with Chinese Sub-Titles Dear friends In my company (in Singapore)we have a lot of chinese welders and its difficult for me to explain the welddefects in chinese because they don understand english well.i have these photos wit english titles,so if anyone has these photos with english and chinese titles please forward me so that I can display on our notice board and ask them to follow. Thanks Raj -- 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 athttp://materials-welding.blogspot.com/http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hmThe 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 athttp://materials-welding.blogspot.com/http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hmThe 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. [anexo Weld Defects & Preventing Methods.pdf eliminado por Valeria Vargas/PM/AFG]

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Re: [MW:15813] PWHT of Cladded Equipment

GENTS,
Which is the best PWHT unit available for pre and post heating? For jobs with cladding is there any special equipment with extra controls?
Best regards,
Shashank V

--- On Tue, 30/10/12, Hemant Solanki <shm8324@gmail.com> wrote:

From: Hemant Solanki <shm8324@gmail.com>
Subject: [MW:15806] PWHT of Cladded Equipment
To: materials-welding@googlegroups.com
Date: Tuesday, 30 October, 2012, 11:15 AM

I have gone through PWHT procedure followed by Vendor in one of our Project for cladded equipment. even though SS cladding is there vendor has kept holding temperature upto 620°C (as per CS base material requirement). whether sensitization phenomenon should look into this or not. Because at this much temperature SS cladding may get sensitize and its property may get inferior.

As per UCL-34 cautionary note
Postweld heat treatment may be in the carbide-precipitation range for unstabilized austenitic chromium–nickel steels, as well as within the range where a sigma phase may form, and if used indiscriminately could result in material of inferior physical properties and inferior corrosion resistance, which ultimately could result in failure of the vessel.

Can any body tell how to take care in such situation ?

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Re: [MW:15814] PIPE- THICKNESS VARIATIONS

Dear Mr. Devang,

Can you please specify, where in piping code indicate that the thickness variation should be between + or - 12.5%

On Tue, Oct 30, 2012 at 11:48 AM, Devang Majithia <dmmajithia@gnfc.in> wrote:

Code is allowing variation of (+)12.5% or (-) 12.5% of specified thickness. Similar kind of issue had occurred with our company. Piping was manufactured as per API 5L Gr. B. After referring API 5L specification we came to know that code is allowing variation of 12.5% on lower and upper side. For other ASME manufactured pipe variation is identical.

Hope info will be helpful to u

Regards

Devang Majithia

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of GOPU NAIR
Sent: Sunday, October 21, 2012 4:26 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:15729] PIPE- THICKNESS VARIATIONS

Dear Mr. Kumar

It is possible for either cold drawn or hot drawn pipe to have thickness variation due to process itself, hence the tolerance is stated in the Codes. Unless your customer specification is very clearly stating about the thickness requirement as 9.53 mm minimum, the pipes within Code tolerances can be accepted. If you so desire, please ask your design department to recalculate the minimum required thickness to support your decisition to accept the pipes.

Regards

Gopu

--- On Sat, 20/10/12, Kumar kerala <sk7920541@gmail.com> wrote:

From: Kumar kerala <sk7920541@gmail.com>
Subject: [MW:15723] PIPE- THICKNESS VARIATIONS
To: materials-welding@googlegroups.com
Date: Saturday, 20 October, 2012, 2:48 PM

Dear members,

We have inspected some pipes (sizes from 12", 16" & 24" all schedule standard (9.53mm))....but it was observed that the thickness upon measurement is from 9.26mm to 9.3mm. the material is API-5L, Gr.B (PSL-1). eventhough the thicknesses are within the API- mill manufacturing tolerences, these are not matching with the Schedule required by drawings/client specifiactions. normally the physical thicknesses on pipe seen as more like 9.6, 9.7mm etc or even up to 10mm....but if it falls below the thickness written on the pipe itself, how could we assess this issue? opinions from all corners are appreciated. also, this may be very common issue with others, kindly share.

Thanks in advance

Kumar.

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Thanks & Regards
Biplab Pal
Welding Inspector

Re: [MW:15815] Can we measure the Ug

the question is how it is possible to measure the Ug, anyhow thks for your kind response

On Tue, Oct 30, 2012 at 1:33 PM, cbe swamy <cbe_swamym@hotmail.com> wrote:

Dear all,

T-274.1 Geometric Unsharpness Determination.

Geometric unsharpness of the radiograph shall be determined in accordance with:

U
g = Fd/D

where,

U
g = geometric unsharpness

F =
source size: the maximum projected dimension of the radiating source (or effective focal spot) in the plane perpendicular to the distance D from the weld or object being
      radiographed

D =
distance from source of radiation to weld or object being radiographed d p distance from source side of weld or object being radiographed to the film D and d shall be determined
     at the approximate center of the area of interest.

Please refer Sec -V ASME for more details.

Thank & Best Regards,

M Veera SAMY- Bureau Veritas.

Coimbatore

Date: Tue, 30 Oct 2012 09:39:55 +0530
Subject: [MW:15801] Can we measure the Ug
From: nagarajanqc187@gmail.com
To: materials-welding@googlegroups.com

Dear Experts,



                        Can we measure the Ug in RT interpretitation ? If Yes , How to measure tell me

with regaeds

nagu

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Vajjiravelu Ravi

Welding,Painting,NDT & ISO 9001/2008

take all steps to save our health wealth & environment.

Materials & Welding

Wednesday, October 31, 2012

Re: [MW:15827] PWHT of Cladded Equipment

RE: [MW:15824] PIPE- THICKNESS VARIATIONS

Re: [MW:15823] HST Pressure variation in two pressure gauges

[MW:15822] Query for correct interpretation of Clause No.QW-407.2 of ASME Section IX

[MW:15821] Re: service wise requirement for PWHT

Re: [MW:15820] PIPE- THICKNESS VARIATIONS

Re: [MW:15819] Can we measure the Ug

[MW:15818] HST Pressure variation in two pressure gauges

Re: [MW:15817] Dissimilar welding CS to DUPLEX SS

[MW:15809] RE: Dissimilar welding CS to DUPLEX SS

Tuesday, October 30, 2012

[MW:15808] RE: Hardness on NACE Material

Re: [MW:15810] Duplex stainless steel PQR test/Consumable requiremnet as per EIL specification

Fw: [MW:15811] Weld Defect Photos with Chinese Sub-Titles

Re: [MW:15812] Weld Defect Photos with Chinese Sub-Titles

Re: [MW:15813] PWHT of Cladded Equipment

Re: [MW:15814] PIPE- THICKNESS VARIATIONS

Re: [MW:15815] Can we measure the Ug

[MW:35346] Cast-iron welding

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