Materials & Welding: August 2008

Saturday, August 30, 2008

[MW:1079] Re: Root under cut

Try using DCSP root, it should help you. Also, as Ramu has mentioned, please check the extent of magnetizm present

regards,

> Date: Thu, 31 Jul 2008 17:47:02 +0530
> From: orm24@yahoo.co.in
> Subject: [MW:986] Re: Root under cut
> To: materials-welding@googlegroups.com
>
>
> Dear Atul,
> If you are concerned more about to avoid root undercut, the only thing you need to do is to demagnetise the job near to wep and on wep with the help of demagnetising equipment and weld after demagnetising. You will get a smooth weld without any undercut.
> For one of our projects, we have over come the undercut problem by demagnetising and welding. This is for your information and for ferritic materials only.
>
> Regards
> Ramu
> +971-50-8249649-personal #
> +971-50-8181761-official #
>
>
> --- On Mon, 28/7/08, atul patil <atulpatil99@gmail.com> wrote:
>
> > From: atul patil <atulpatil99@gmail.com>
> > Subject: [MW:976] Re: Root under cut
> > To: materials-welding@googlegroups.com
> > Date: Monday, 28 July, 2008, 1:22 PM
> > to avoid root undercut
> > thanks in advance
> >
> >
> > On 7/27/08, Paresh Katvi <pkatvi@gmail.com> wrote:
> > >
> > > Dear Atul
> > >
> > > Ar you looking for information How to avoid root
> > undercut or NDT method to
> > > analisied under cut in most sensitive manner?
> > >
> > > please give further information.
> > >
> > > Regards
> > >
> > > Paresh Katvi
> > >
> > >
> > > On 7/22/08, atul patil <atulpatil99@gmail.com>
> > wrote:
> > >
> > >> Dear all
> > >> I am working with Gas export pieline in Kazakhstan
> > >> We are using 6010 electrode for root
> > >> & 8010 for fill cap
> > >>
> > >> we are facing the problem with root undercut
> > >>
> > >> Actually on the basis of radiography ( ISO 13847 )
> > doesnt ask to
> > >> cmpareason of density with parent metal It says
> > only about length
> > >>
> > >> Please guide
> > >> It is very difficult to prepare the calibration
> > block for UT ( Manual ) in
> > >> my city ( Atyrau )
> > >> Could you please guide
> > >> any suggestions welcome.
> > >> >>
> > >>
> >
> >
>
> Unlimited freedom, unlimited storage. Get it now, on http://help.yahoo.com/l/in/yahoo/mail/yahoomail/tools/tools-08.html/
>
> --~--~---------~--~----~------------~-------~--~----~
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[MW:1078] Re: 1047] thumb rule

Have you tried Ar CO2 mixed gases? What is the gas being used and what is the flow rate

regards,
jd

Subject: [MW:1050] RE: 1047] thumb rule
Date: Fri, 22 Aug 2008 10:59:59 +0530
From: R.Bathula@ticb.com
To: materials-welding@googlegroups.com

If ur using Globular you can switch to spray transfer method to reduce spatter,

V=20+0.4i is a thumb rule for SMAW, no idea about GMA.

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of mech
Sent: Thursday, August 21, 2008 7:49 PM
To: Materials & Welding
Subject: [MW:1047] thumb rule

hai friends

is there any thumb rule to find current and voltage in metal active

gas welding ... v r using semi automatic MAG machine.with 2.4 mm

filler wire dia .current in the rang of 570-670 amps and voltage

30-39 .and tell wat would b the best way to reduce spattesrs and blow

holes and cracks in this welding .

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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.
-~----------~----~----~----~------~----~------~--~---

Friday, August 29, 2008

[MW:1077] Re: [piping_valves] piping_valves

It is depend on the type on non-metal that you are using for seating material?

Plaese tell what is seating material?

On 8/29/08, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:

In general you may refer Table A323.4.3 of ASME B31.3

From: piping_valves@yahoogroups.com [mailto:piping_valves@yahoogroups.com] On Behalf Of swapnil gorantiwar
Sent: Friday, August 29, 2008 1:51 PM
To: piping_valves@yahoogroups.com
Subject: [piping_valves] piping_valves

i want to know the temperature range of non-metallic seat material for ball valves.

for which temperature range which non-metallic seat material is to be used in ball valves?

Regards,

Swapnil Gorantiwar

__._,_.___
--~--~---------~--~----~------------~-------~--~----~
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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.
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By BR - August 29, 2008 No comments:
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Interpretation of Radiographic images

Interpretation if radiographic images for discontinuities in the welds

Transverse crack

Logitudinal Crack

Internal concavity

Burn through

Logitudinal root crack

Tungsten Inclusions

Elongated Slag Lines

Lack of Side wall fusion

Offset or Mismatch

Offset or Mismatch with LOP

Interpass slag inclusions

Incomplete penetration or LOP

Interpass Cold Lap

Scattered porosity

External porosity

External concavity

Excessive penetration

Cluster porosity

Root pass aligned porosity

External undercut

Internal undercut

[MW:1076] RE: [piping_valves] piping_valves

In general you may refer Table A323.4.3 of ASME B31.3

From: piping_valves@yahoogroups.com [mailto:piping_valves@yahoogroups.com] On Behalf Of swapnil gorantiwar
Sent: Friday, August 29, 2008 1:51 PM
To: piping_valves@yahoogroups.com
Subject: [piping_valves] piping_valves

i want to know the temperature range of non-metallic seat material for ball valves.

for which temperature range which non-metallic seat material is to be used in ball valves?

Regards,

Swapnil Gorantiwar

__._,_.___

[MW:1075] Finex and Corex furnaces.

As in the past we found few questions on furnaces and felt to add this to those messages.

Just today I read an interesting second page article in newspaper on Finex furnace which are new generation furnaces without ovens able to operate using fine coal instead of the traditional coking coal which is a high pollutant. Using this furnace the energy cost and pollution is reduced. And yet it does produce the pig iron suitable for high grade steels.

Posco with Siemens, then VAI has developed this in the past 10 years spending heavily and Posco's new plant in India and Vietnam are planned to be build with these Finex furnaces. This is a modification of Corex furnaces as per the article.

They claim the cost is reduced by 10% in overall and as the current fine coal price and coking coal price gap is increasing, they hope it should be more profitable in the coming years.

Good for Nature and Environment and in having a competitive steel price.

Regards,
Kannan. --~--~---------~--~----~------------~-------~--~----~
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.
-~----------~----~----~----~------~----~------~--~---

[MW:1074] RE: 1073] The influence of flux TiO2, MnO and Al2O3 for weldingproperties

Acicular ferrite, is a new term to me, is it some thing related to
improving toughness? (Though' I didn't remember but I read it somewhere
on a article related to underwater welding)
I am end user of consumables (and most of us) doesn't bother about the
chemistry of coatings in to that depth
I am curious to know what made you to change coating for 60XX series
rather than going for 70XX series to get better mechanical properties?

From the textbook reading I can say Tio2 is an arc stabilser, where as
Mno&Al2O3 are added for slag forming.

Wish you Good luck, and hope you will share your findings with us soon

Probably you could find some info for your research in the book Welding
metallurgy by George E. Linnert
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of verry
Sent: Thursday, August 28, 2008 11:32 PM
To: Materials & Welding
Subject: [MW:1073] The influence of flux TiO2, MnO and Al2O3 for
weldingproperties

Dear Members

I have a problem with my reseach, i want to know the influence of
those flux ability to change the properties of weld metal. Know i was
found an advantage that flux TiO2 can increase the mechanical
properties of weld metal. from the AWS Standard they say that E6013
will have 430-460 MPa of minimum strength, but i had 508 MPa with
E6013 by adding flux TiO2 in electrode face.

My analysis now just from the mechanical test, i was find an acicular
ferrite structure in this research. But i don't know how the
accicular ferrite function for the mechanical properties of weld metal
and the theory of the influence of flux TiO2, MnO and Al2O3
accurately.

I need yours help for all members that want to partcipate.

thanks so much...

note : this research done in Mechanical Engineering Departmet,
University of Andalas, West Sumatra, Indonesia.

Thursday, August 28, 2008

[MW:1073] The influence of flux TiO2, MnO and Al2O3 for welding properties

Dear Members

I need yours help for all members that want to partcipate.

thanks so much...

note : this research done in Mechanical Engineering Departmet,
University of Andalas, West Sumatra, Indonesia.

[MW:1072] Re: 985] Re: HAZ

Dear Friends,
My answer was with respect to the question asked ie what are the differences between API 650 and API 620 Tanks.
I had highlighted only the major differences, Higher pressure what I meant with respect to code limitation between API 650 and API 620 and Double wall what I mentioned is with respect to low temperature servcies appendix Q which is not dealt by API 650.

If you are using API 650 OR API 620 ,You must read the code scope and limitations and API 650 Limitation is the design conditions ie max internal pressure not exceeding the wt of roof plates and tempt 90 degree centigrade or 2.5 psi (18kpa) max internal pressure as per APPENDIX F and Max tempt 260 degree centigrade in line with Appendix M requirement.

whereas API 620 Max Limit is internal pressure of 15psi and 250 degree F.Also refer appendix R & Q .

Limitation on lower pressure for API 620 Pl refer API 650 Appendix M Fig F 1 Design Decision Tree.

Best Regards,
Francis Lobo
----- Original Message -----
From: Rituraj Bose <boser2006@gmail.com>
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Tue, 26 Aug 2008 21:43:05 +0530 (IST)
Subject: [MW:1064] Re: 985] Re: HAZ

Hi,
I dont think the statement is correct for API 620. It is the code for
Large, welded, low pressure storage tanks and can be of single wall or
double wall construction.
Regards,
R. Bose

On Aug 25, 12:55 pm, francis.l...@indiatimes.com wrote:
> Dear Freinds,
> API 650 is a code for tankages for storage of liquid petroleum Products at atmospheric pressure or very low posetive pressure ( ref Annexure M) whereas API620 is a code for storage tanks for higher pressures and it is having primary shell and secondary shell and primary shell is for the storage of product like ethylene/propylene/ammonia etc with the gap between two shell is filled with insulating material to take care of cryogenic temperature and more stringent requirements are covered in API 620.
>
> Regarding HAZ , it is not measured by length ,we speak about width of HAZ and noramlly it is not more than 3to 5mm whcih normally you can see when you do a macrosection of weld coupon and this can be reduced by using preheat /temperbead welding or by having chemistry with low CE
>
> Best Regards,
> Francis lobo
>
>
>
> ----- Original Message -----
> From: prabhakar...@gmail.com
> To: Materials & Welding <materials-welding@googlegroups.com>
> Sent: Sat, 23 Aug 2008 16:16:48 +0530 (IST)
> Subject: [MW:1052] Re: 985] Re: HAZ
>
> Hi,
>
> I think API 620 is for Cryogenic product storage tanks like LNG etc.
>
> Regards
> Prabhakar. S
>
> On Jul 31, 3:50 pm, "Mahuri Snehkumar \(TIPO - QA/QC\)"
> <S.Mah...@panipat.ticb.com> wrote:
> > Dear Bose,
>
> > The difference what you have mentioned that I am also well aware of, but I require some other major difference.
>
> > Regards,
>
> > Snehkumar L. Mahuri
> > Lead - Welding / NDE
> > EPCC 2A, PANIPAT
> > 9215989508
>
> > -----Original Message-----
> > From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Rituraj Bose
> > Sent: Thursday, July 31, 2008 3:32 PM
> > To: Materials & Welding
> > Subject: [MW:985] Re: HAZ
>
> > Dear Mahuri,
>
> > Actually length of HAZ cannot be specified so easily. In any case you
> > can follow the link to have just an idea for it.
>
> >http://www.esabna.com/us/en/education/knowledge/qa/How-does-welding-a...
>
> > Regarding your 2nd question I can tell that the Code name itself
> > identifiy the difference.
> > API 650 is for the "Welded Steel Tanks for Oil Storage" and API 620 is
> > for the "Design and Construction of Large, Welded, Low-Pressure
> > Storage Tanks".
>
> > Regards,
>
> > R. Bose
>
> > On Jul 29, 7:11 am, "Mahuri Snehkumar \(TIPO - QA/QC\)"
> > <S.Mah...@panipat.ticb.com> wrote:
> > > Dear friends,
>
> > > Can someone tell me the exact length of HAZ area after the weld.
>
> > > Also what is the main difference between API 650 and API 620 codes.
>
> > > Regards,
>
> > > Snehkumar L. Mahuri
>
> > > Lead - Welding / NDE
>
> > > EPCC 2A, PANIPAT
>
> > > 9215989508
>
> > > image001.gif
> > > 92KViewDownload- Hide quoted text -
>
> > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

[MW:1071] Re: PWHT by Induction Heating Method

as far as i know it is true to some extent induction heating is used
for bending in the preffabrication shops, but i am not aware of any
for PWHT of welds at site by induction heating.

In particular how it will effect in higher thickness (>30mm) over
conventional method, what is the advantage?

On 28 Aug, 21:32, Kannan.Sunda...@Linde-LE.com wrote:
> I understand that in projects like Borouge, Ruwais the main construction
> contractor CCC is using and are prefering the induction heating. As per
> my conversation the same as you have highlighted of the prefabrication
> spooling had been found to be more efficient and less time consuming and
> very acurate control of temperature, in comparision.
>
> With regard to portability as per the contractor, they are using both
> portable and as well as fabrication shop stationed machine. It is
> available on lease by quite a no. of suppliers in the gulf region in
> particular. I havn't checked out the names of manufacturer nor the leasing
> agents, but can find out.
>
> CCC also does have its own facility in the region in catering to various
> project sites of them. So in that sense it could be more efficient and
> cheaper solution on the run though the initial investment is high.
>
> With regards,
> Kannan
>
> Raghuram Bathula <raghurambath...@gmail.com>
> Sent by: materials-welding@googlegroups.com
> 28/08/2008 16:51
> Please respond to
> materials-welding@googlegroups.com
>
> To
> "Materials & Welding" <materials-welding@googlegroups.com>
> cc
>
> Subject
> [MW:1069] PWHT by Induction Heating Method
>
> Dear members
>
> Please share your experience on the subject method for pipe welds
> (PWHT to be carried at site), one of our client insisting for
> Induction heating instead of PWHT by conventional resistance coil
> heating.
>
> tho' i have seen literature on this I need info on availability (first
> hand experience) of the equipment, portability etc..
>
> I understand it is faster but advantageous in mass production, and may
> not be easier for site activities. i don't see any reason for this
> method over resistance heating
--~--~---------~--~----~------------~-------~--~----~
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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.
-~----------~----~----~----~------~----~------~--~---

[MW:1070] Re: PWHT by Induction Heating Method

I understand that in projects like Borouge, Ruwais the main construction contractor CCC is using and are prefering the induction heating. As per my conversation the same as you have highlighted of the prefabrication spooling had been found to be more efficient and less time consuming and very acurate control of temperature, in comparision.

With regard to portability as per the contractor, they are using both portable and as well as fabrication shop stationed machine. It is available on lease by quite a no. of suppliers in the gulf region in particular. I havn't checked out the names of manufacturer nor the leasing agents, but can find out.

CCC also does have its own facility in the region in catering to various project sites of them. So in that sense it could be more efficient and cheaper solution on the run though the initial investment is high.

With regards,
Kannan

Raghuram Bathula <raghurambathula@gmail.com>
Sent by: materials-welding@googlegroups.com

28/08/2008 16:51

Please respond to
materials-welding@googlegroups.com

To	"Materials & Welding" <materials-welding@googlegroups.com>
cc
Subject	[MW:1069] PWHT by Induction Heating Method

Dear members Please share your experience on the subject method for pipe welds (PWHT to be carried at site), one of our client insisting for Induction heating instead of PWHT by conventional resistance coil heating. tho' i have seen literature on this I need info on availability (first hand experience) of the equipment, portability etc.. I understand it is faster but advantageous in mass production, and may not be easier for site activities. i don't see any reason for this method over resistance heating --~--~---------~--~----~------------~-------~--~----~
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.
-~----------~----~----~----~------~----~------~--~---

[MW:1069] PWHT by Induction Heating Method

Dear members

Please share your experience on the subject method for pipe welds
(PWHT to be carried at site), one of our client insisting for
Induction heating instead of PWHT by conventional resistance coil
heating.

tho' i have seen literature on this I need info on availability (first
hand experience) of the equipment, portability etc..

I understand it is faster but advantageous in mass production, and may
not be easier for site activities. i don't see any reason for this
method over resistance heating

[MW:1068] Re: flash butt welding

what code your are using and what is your material?

On 28 Aug, 19:41, mgk <mgkuma...@gmail.com> wrote:
> can any one tell what are the essential variables which we have to
> consider when we are welding plate thickness of 8 and 12 mm by flash
> butt welding
--~--~---------~--~----~------------~-------~--~----~
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.
-~----------~----~----~----~------~----~------~--~---

[MW:1067] flash butt welding

can any one tell what are the essential variables which we have to
consider when we are welding plate thickness of 8 and 12 mm by flash
butt welding

[MW:1066] FW: MARWEL 2008

For the benefit of Chennai friends, or who or available at Chennai during last week of September2008.

From: hasan [mailto:hasan@igcar.gov.in]
Sent: Wednesday, August 27, 2008 5:17 PM
To: Bathula Raghuram (Mumbai - PIPING)
Subject: MARWEL 2008

Dear Sir,

The Indian Indian Institute of Welding (IIW), Chennai Branch, is organising a two day COURSE ON METALLURGICAL ASPECTS RELATED TO WELDING (MARWEL-08) during 25 and 26 September, 2008, at Hotel Radha Park Inn, 171, Jawaharlal Nehru Salai, Chennai - 600106. This course is specifically designed for practicing welding engineers, technocrats and managers; designers; inspection and quality control engineers; fabrication engineers, research scholars, and academicians involved in teaching welding; but did not have any formal training in metallurgy. I am enclosing a brochure for your perusal.

Welding plays a key role in every manufacturing process in a wide range of industries Any welding engineer involved in design, fabrication or inspection of components for petrochemical, power, nuclear, and other industries would agree that a proper understanding of welding metallurgy is very important at all stages of fabrication for the successful execution of the job. Unfortunately, most of the welding or design engineers do not receive formal metallurgical education during their graduation. The knowledge gained from experience is often insufficient to make appropriate decision. It is not uncommon that wrong decisions taken without proper understanding of the welding metallurgy results in significant losses, delays or cost overrun both in execution of projects and during the operation of plant and equipments.

The subject content of MARWEL 2008 has been drawn up to address the above issues. Eminent speakers from the industries and research institutions will deliver lectures on 14 topics which include

v Physical metallurgy principles relevant to welding

v Welding metallurgy of different steels, cast iron, austenitic stainless steel, duplex stainless steel and Ni base alloys

v Welding metallurgy of Al and Ti alloys

v Metallurgical aspects of choosing welding consumables

v Metallurgy of Dissimilar Material Joining and Surfacing

v Metallurgy of weld cracking

v Metallurgical considerations in specification, procurement, inspection

v Metallurgy in codes and standards

v The science and technology of heat treatment

v Mechanical Testing of welded joints

v Corrosion of welded joints

v Fracture Mechanics and Fitness for purpose

v Metallurgical considerations in Non-destructive testing evaluation

I am writing this letter to request you to nominate delegates from your organisation in large numbers to MARWEL 2008. I am sure the delegates would benefit immensely by attending NECOR 2008. I also invite you to advertise in the Proceedings of MARWEL 2008 and/or be a sponsor of the Workshop.

I also request you to give wide publicity to this Workshop amongst your contacts.

Thanking you and with warm regards

Yours sincerely

(HASAN SHAIKH)

Chairman

The IIW, Chennai Branch

Wednesday, August 27, 2008

[MW:1065] Welding of Borated SS

Dear Friends, One of our jobs need welding of Borated SS plates (UNS
30464). Would anybody like to share his experience?

Tuesday, August 26, 2008

[MW:1064] Re: 985] Re: HAZ

Hi,
I dont think the statement is correct for API 620. It is the code for
Large, welded, low pressure storage tanks and can be of single wall or
double wall construction.
Regards,
R. Bose

[MW:1063] RE: 1060] Re: Impact testing at -29 deg c and warmer

Dear Mr. Aarpee
Can you pl give ref to the para where does this requirement (for high
Pressure Natural Gas applications.........) come from?

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of
francis.lobo@indiatimes.com
Sent: Monday, August 25, 2008 5:50 PM
To: materials-welding@googlegroups.com
Cc: ramprasad.chari@gmail.com
Subject: [MW:1060] Re: Impact testing at -29 deg c and warmer

Dear Friends,
SHELL material stanadard DEP 30.10.02.11.GEN, Thum Rule may be applied
for deriving the impact properties if you have tested at -46 degree
centigrade to derive at -20 or warmer temperatures, ( 1.5 JOULES PER
DEGREE CENTIGRADE , Eg : 18 joules at -51 degree centigrade may be
regarded as 27 joules at -45degree centigrade

Noramlly if it is tested at -46 degree centigrade there is no meaning
asking for -20 degree or warmer ,Normally for NGL servcie etc -20degree
or warmer impact is asked to take care of upset conditions such as
sudden stop or shut downs etc to ensure the impact properties where
material is not impact tested or not required by code.
For A333GR6 /A350 LF2 code calls for impact testing at -46 degree or
cooler temeperatures and in Europe all materials need to be tested for
+20 degree centigrade if ASME/API code does not specify.

Best Regards,
Francis Lobo
----- Original Message -----
From: Aarpee <ramprasad.chari@gmail.com>
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Mon, 25 Aug 2008 16:22:23 +0530 (IST)
Subject: [MW:1059] Impact testing at -29 deg c and warmer

Dear members,
As per PV code ASME SEC VIII Div 1,impact test is not mandatory for PV
materials for P 1 and Gr1 &2 materials upto thk of 1" for majority of
materials.However for high Pressure Natural Gas applications say 100
Bar design pressure,it is asked to do impact testing at -20 deg C for
materials like A333GR6/A350LF2CL1 materials.Inspite of having
satisfactory values at testing temperature of -45/-46 deg C,testing at
-20 deg C is insisted.Can anyone explain logic behind this?

Further,it may please be noted that as per:
UCS 66(c)-no impact testing is required for B16.5 flanges of ferritic
steel when used at MDMT not colder than -29deg C and;
UCS 66(d)-pipe size 4" and below(P NO 1),impact test exemption is
there as a function of Yield Stress for temp -104 Deg C and warmer
e.g. 20 ksi to 30 ksi-6.0mm thk.Which implies that for 6.0 mm thk pipe
of 4"NB and below,no impact test is mandatory for tempr upto -104 deg
C.
However for Natural Gas applications,for material like A106GR B/A105
materials,impact test at 0 deg C is insisted for sizes 2"NB and above.
Here again,can A106GR B/A105 materials be safely used without impact
testing upto -29 deg C?
Regards
Aarpee

[MW:1062] RE: [SPAM] [MW:1054] Re: AISI Grade 4130 Alloy

Thank you very much Parviz,

According to your direction I found it.

Can I have your email address and the permission of contacting you?

My email address is: ali@propipemanufacturing.com

Sincerely yours’

Ali

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of parviz farhadi
Sent: Saturday, August 23, 2008 6:28 AM
To: materials-welding@googlegroups.com
Subject: [SPAM] [MW:1054] Re: AISI Grade 4130 Alloy

I think for this pressure and temperature still u can use the ASME B31.3 just use the section K which is high pressure.

Regards,

On 8/22/08, ali <ali@propipemanufacturing.com> wrote:

Dear Friends,

I would appreciate if you be able to give your advice to me about the designing of a very high pressure line heater.

I am in process to design a line heater with the following information:

MAWP: 10000 PSI @ -40/ 250 F

Corrosion Allowance: 1/16"

RTJ Weld Neck: 3+1/16" 10K API

4130 Material

I realize that this does not fall under the normal construction codes ( B31.3 ). However I am unfamiliar with what direction to take. Your help in this matter is greatly appreciated.

Sincerely yours'

Alia

<br

Monday, August 25, 2008

[MW:1061] Re: PWHT Furnace

Dear Chetan and other friends,

Gas fired furnace is cost effective compare to Electrical one.
Gas fired furnace can be made of bigger sizes to accomodate bigger size of components. Electrical furnace is suitable for smaller size only where test coupans or test pieces are to be heat treated.

Even In gas fired, Natural Gas is better than LPG but offcourse depends upon availability and necessary infrastructure. I am not aware about UAE condition as far as availability of NG and LPG.

hope I answered your query.

Regards,

Rajesh B. Patel
Abu Dhabi

--- On Mon, 8/25/08, Chetan Parekh <cpp1506@gmail.com> wrote:

> From: Chetan Parekh <cpp1506@gmail.com>
> Subject: [MW:1056] PWHT Furnace
> To: materials-welding@googlegroups.com
> Date: Monday, August 25, 2008, 2:00 AM
> Hi Friends,
>
> I need comparision between gas fired furncae and electrical
> induction
> heating furnace. Basically I am looking for advantage and
> disadvantage
> between these two heating media.
>
> Regards,
>
> Chetan Parekh
> Abu Dhabi
>
>

[MW:1060] Re: Impact testing at -29 deg c and warmer

Dear Friends,
SHELL material stanadard DEP 30.10.02.11.GEN, Thum Rule may be applied for deriving the impact properties if you have tested at -46 degree centigrade to derive at -20 or warmer temperatures, ( 1.5 JOULES PER DEGREE CENTIGRADE , Eg : 18 joules at -51 degree centigrade may be regarded as 27 joules at -45degree centigrade

Noramlly if it is tested at -46 degree centigrade there is no meaning asking for -20 degree or warmer ,Normally for NGL servcie etc -20degree or warmer impact is asked to take care of upset conditions such as sudden stop or shut downs etc to ensure the impact properties where material is not impact tested or not required by code.
For A333GR6 /A350 LF2 code calls for impact testing at -46 degree or cooler temeperatures and in Europe all materials need to be tested for +20 degree centigrade if ASME/API code does not specify.

[MW:1058] Re: 985] Re: HAZ

Dear Freinds,
API 650 is a code for tankages for storage of liquid petroleum Products at atmospheric pressure or very low posetive pressure ( ref Annexure M) whereas API620 is a code for storage tanks for higher pressures and it is having primary shell and secondary shell and primary shell is for the storage of product like ethylene/propylene/ammonia etc with the gap between two shell is filled with insulating material to take care of cryogenic temperature and more stringent requirements are covered in API 620.

Regarding HAZ , it is not measured by length ,we speak about width of HAZ and noramlly it is not more than 3to 5mm whcih normally you can see when you do a macrosection of weld coupon and this can be reduced by using preheat /temperbead welding or by having chemistry with low CE

Best Regards,
Francis lobo

----- Original Message -----
From: prabhakars84@gmail.com
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Sat, 23 Aug 2008 16:16:48 +0530 (IST)
Subject: [MW:1052] Re: 985] Re: HAZ

Hi,

I think API 620 is for Cryogenic product storage tanks like LNG etc.

Regards
Prabhakar. S

On Jul 31, 3:50 pm, "Mahuri Snehkumar \(TIPO - QA/QC\)"
<S.Mah...@panipat.ticb.com> wrote:
> Dear Bose,
>
> The difference what you have mentioned that I am also well aware of, but I require some other major difference.
>
> Regards,
>
> Snehkumar L. Mahuri
> Lead - Welding / NDE
> EPCC 2A, PANIPAT
> 9215989508
>
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Rituraj Bose
> Sent: Thursday, July 31, 2008 3:32 PM
> To: Materials & Welding
> Subject: [MW:985] Re: HAZ
>
> Dear Mahuri,
>
> Actually length of HAZ cannot be specified so easily. In any case you
> can follow the link to have just an idea for it.
>
> http://www.esabna.com/us/en/education/knowledge/qa/How-does-welding-a...
>
> Regarding your 2nd question I can tell that the Code name itself
> identifiy the difference.
> API 650 is for the "Welded Steel Tanks for Oil Storage" and API 620 is
> for the "Design and Construction of Large, Welded, Low-Pressure
> Storage Tanks".
>
> Regards,
>
> R. Bose
>
> On Jul 29, 7:11 am, "Mahuri Snehkumar \(TIPO - QA/QC\)"
> <S.Mah...@panipat.ticb.com> wrote:
> > Dear friends,
>
> > Can someone tell me the exact length of HAZ area after the weld.
>
> > Also what is the main difference between API 650 and API 620 codes.
>
> > Regards,
>
> > Snehkumar L. Mahuri
>
> > Lead - Welding / NDE
>
> > EPCC 2A, PANIPAT
>
> > 9215989508
>
> > image001.gif
> > 92KViewDownload- Hide quoted text -
>
> - Show quoted text -

[MW:1059] Impact testing at -29 deg c and warmer

[MW:1057] RE: 1056] PWHT Furnace

Fuel-Fired Furnaces

Advantages:

· Lower energy cost

· Easy to adjust or alter connected input

· Faster heat-up times because inexpensive control factors can be added to accommodate the difference in fuel burned during heat-up

Disadvantages:

· Requires extensive ventilation systems

· Potential explosion or fire hazard

· Requires more manpower for start-up and shutdown

· Adjustment more difficult to maintain, resulting in excessive fuel use

· Only certain materials or types of products can be run in direct-fired furnaces due to the effect of high dew point and oxidizing flue gases on the part surface

Electrically Heated Furnaces

Advantages:

· Systems are clean and free of the pollution normally found with fuel-fired systems

· Quieter because of the absence of blowers and combustion noise

· More uniform heat pattern

· No exhaust system required; no make-up air system required

· Does not generally require purge or flame safety systems

· Electrical power available almost everywhere

Disadvantages:

· High initial equipment costs

· Higher operating costs

· Cool-down times are longer because no combustion air is available

Source: ASM

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Chetan Parekh
Sent: Monday, August 25, 2008 2:00 AM
To: materials-welding@googlegroups.com
Subject: [MW:1056] PWHT Furnace

Hi Friends,

I need comparision between gas fired furncae and electrical induction heating furnace. Basically I am looking for advantage and disadvantage between these two heating media.

Regards,

Chetan Parekh

Abu Dhabi

Materials & Welding

Saturday, August 30, 2008

[MW:1079] Re: Root under cut

[MW:1078] Re: 1047] thumb rule

Friday, August 29, 2008

[MW:1077] Re: [piping_valves] piping_valves

Interpretation of Radiographic images

[MW:1076] RE: [piping_valves] piping_valves

[MW:1075] Finex and Corex furnaces.

[MW:1074] RE: 1073] The influence of flux TiO2, MnO and Al2O3 for weldingproperties

Thursday, August 28, 2008

[MW:1073] The influence of flux TiO2, MnO and Al2O3 for welding properties

[MW:1072] Re: 985] Re: HAZ

[MW:1071] Re: PWHT by Induction Heating Method

[MW:1070] Re: PWHT by Induction Heating Method

[MW:1069] PWHT by Induction Heating Method

[MW:1068] Re: flash butt welding

[MW:1067] flash butt welding

[MW:1066] FW: MARWEL 2008

Wednesday, August 27, 2008

[MW:1065] Welding of Borated SS

Tuesday, August 26, 2008

[MW:1064] Re: 985] Re: HAZ

[MW:1063] RE: 1060] Re: Impact testing at -29 deg c and warmer

[MW:1062] RE: [SPAM] [MW:1054] Re: AISI Grade 4130 Alloy

Monday, August 25, 2008

[MW:1061] Re: PWHT Furnace

[MW:1060] Re: Impact testing at -29 deg c and warmer

[MW:1058] Re: 985] Re: HAZ

[MW:1059] Impact testing at -29 deg c and warmer

[MW:1057] RE: 1056] PWHT Furnace

[MW:35346] Cast-iron welding

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