type coated Bolts carbon steel bolts ( A193 Gr. B7 ) fo Stainless steel flanges

[Pisat, R. R(ahul)]

Hello all,

Please recommend me the type of coated carbon steel bolts ( A193 Gr. B7 ) to use with stainless steel flanges.
I am sure no to apply galvanised bolts with SS flanges.

Our construction team is worried about the rusted of the carbon steel bolts to be apply with stainless steel flanges.

Please reply your recommendation for type of coating for bolts ?

Kind regards

Rahul

[Vinayak Kale]

depending upon process requirement , you can choose either power or xylene coating , this will have cost implication or one more way , go for Hot Dip Galvanizing or electroplating , which ever is affordable  



Thanks & Best Regards,

Vinayak Kale
E & C  DIv. QA & I , OGSP
Larsen And Toubro Ltd
Powai , Mumbai
vinaya...@lntenc.com
Ph No.+91- 67053805/3685
Fax No. +91-67054789
(M) - + 91 9892743803
Disclaimer :This email and any files transmitted with it are intended solely for the use of the addressee(s) only and may contain confidential and/or privileged information. If you are not the addressee, then this message is not intended for you and be advised that you have received this email in error and that any use , dissemination , forwarding, printing or copying of this email is strictly prohibited. In such case please notify the sender and delete this email and any attachments with it from your system immediately.Receipt of this email by you shall not give rise to any liability on the part of Larsen & Toubro Limited

[gabrie...@akersolutions.com]

Most of the client's specs I've seen specify Hot Dip Galvanized bolts to ASTM A153. for both carbon and stainless steel.

 

Unless there is a restriction from a process fluid point of view (i.e. corrosive for galvanized coatings). In that case you may have to investigate other type of bolt materials (A193 B8 - Austenitic Stainless Steel) or other types of coatings.

 

Regards,

 

Gabriel

---

From: Pisat, R. R(ahul) [mailto:Rahul...@akzonobel.com]
Sent: 04 December 2009 09:04
To: material...@googlegroups.com
Subject: [MW:3787] type coated Bolts carbon steel bolts ( A193 Gr. B7 ) fo Stainless steel flanges

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[des...@toyoindia.com]

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Many Licensor's specification specifies A193 B7 / 2H bolts for stainless steel flamges.
Use of galvanised bolt not seen at all for SS flanges.

Also note, A193 B7/2H bolts are not CS bolts. These are alloy steel bolts.

I did not understand the stage of your project . If youare planning to buy new one than buy ss bolts or can go for B16 / 4 bolts also.


Thanks & Regards,
Dhwani Desai.
TOYO - PLANNING & PIPING DEPT.
91-22-2573 7681.

"Pisat, R. R(ahul)" <Rahul...@akzonobel.com> 12/04/2009 02:33 PM Please respond to material...@googlegroups.com

To <material...@googlegroups.com> cc Subject [MW:3787] type coated Bolts carbon steel bolts ( A193 Gr. B7 ) fo         Stainless steel flanges

Hello all,

Kind regards

Rahul

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[Kristian Lund Jepsen (KUJ)]

The best thing is to select super duplex SS bolts - if for offshore applications.

They have sufficient strength and will not be subject to galvanic corrosion.

 

regards

Kristian

---

From: Vinayak Kale [mailto:Vinaya...@lntenc.com]
Sent: 4. december 2009 10:27
To: material...@googlegroups.com
Subject: Re: [MW:3789] type coated Bolts carbon steel bolts ( A193 Gr. B7 ) fo Stainless steel flanges
Importance: High

--

[nilesh parsekar]

Dear Rahul,

 

               It is not advisable to use painted bolt on stainless steel flanges.During tightening of the bolt this paint will crack.So better use stainless steel bolt for ss flanges.

 

regds

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--
Nilesh Parsekar
Sr QC Co-ordinator
Exterran Belleli Energy
Fujairah - Sidem
Mobile - 0506561785

[ANANT ONKAR]

Dear Roul,
 
1)Pl. check what is design req.
 
2)If it is not specified in design check your budget if budget allowes go for S.S. or go for hot deep gal. forA193 B7/2H bolts.
 
Regards
Anant
Ocean Rubber Factory
Sharjah 
 

---

To: material...@googlegroups.com
CC: material...@googlegroups.com
Subject: Re: [MW:3795] type coated Bolts carbon steel bolts ( A193 Gr. B7 ) fo Stainless steel flanges
Date: Fri, 4 Dec 2009 16:48:06 +0530
From: des...@toyoindia.com

Kind regards

Rahul

---

http://windows.microsoft.com/shop Find the right PC for you.

[Ranasaria Shivanand Rajendra (NPCC)]

Please inform bolts are required for onshore or offshore environment.

 

In offshore environments,

For SS flanges, even SS304 /316 ( due to crevice corrosion problems in corrosive atmosphere ) Bolts are not preferred,

CS Galvanised bolts are any way not preferred due to galvanic corrosion problems ( I think )

 

We use

a. UNS 32760 Bolts or

b. CS/LTCS + Fluropolymer coated bolts (see attachment)

 

Regards,

Shivanand R Ranasaria

---

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The information contained in this communication is intended solely for the use of the individual or entity to whom it is addressed and others authorized to receive it. It may contain confidential or legally privileged information. If you are not the intended recipient you are hereby notified that any disclosure, copying, distribution or taking any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by responding to this email and then delete it from your system. NPCC is neither liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt.

[Chandra Bhusan Tripathi]

Hi Everyone,

SS bolts are very costly and not all coustomer advise to use in all lines, It depend how critical is your line is otherwise, galvanise bolts with insulation washer (kit) is a cheaper option instead of  SS bolts.

Regards

Chandra Bhusan Tripathi

On Sun, 06 Dec 2009 15:25:03 +0530 wrote
>

Please inform bolts are required for onshore or offshore environment.

In offshore environments,

For SS flanges, even SS304 /316 ( due to crevice corrosion problems in corrosive atmosphere ) Bolts are not preferred,

CS Galvanised bolts are any way not preferred due to galvanic corrosion problems ( I think )

We use

a. UNS 32760 Bolts or

b. CS/LTCS + Fluropolymer coated bolts (see attachment)

Regards,

Shivanand R Ranasaria

---

From: des...@toyoindia.com [mailto:des...@toyoindia.com]
>Sent: Friday, December 04, 2009 3:18 PM
>To: material...@googlegroups.com
>Cc: material...@googlegroups.com
>Subject: Re: [MW:3795] type coated Bolts carbon steel bolts ( A193 Gr. B7 ) fo Stainless steel flanges

>

>Many Licensor's specification specifies A193 B7 / 2H bolts for stainless steel flamges.
>Use of galvanised bolt not seen at all for SS flanges.
>
>Also note, A193 B7/2H bolts are not CS bolts. These are alloy steel bolts.
>
>I did not understand the stage of your project . If youare planning to buy new one than buy ss bolts or can go for B16 / 4 bolts also.
>
>
>Thanks & Regards,
>Dhwani Desai.
>TOYO - PLANNING & PIPING DEPT.
>91-22-2573 7681.
>
>

"Pisat, R. R(ahul)" 12/04/2009 02:33 PM Please respond to >material...@googlegroups.com

To cc

[Kristian Lund Jepsen (KUJ)]

Duplex SS bolts are costly. But on the other hand, at least in our region we do not wish to compromise the safety.

 

Insulation gaskets/kits need to be fire-safe if used in hydrocarbon service.

 

Unfortunately, now where asbestos is prohibited in most contries, standard insulation kits are with washers and sleeves made in PTFE (teflon).

They are not fire safe, during a fire they will become soft and eventually melt - and the flanged connection will open. This may release hydrocarbons to the fire.

 

Regards

Kristian

---

From: Chandra Bhusan Tripathi [mailto:c...@rediffmail.com]
Sent: 7. december 2009 13:16
To: ran...@npcc.ae
Cc: material...@googlegroups.com
Subject: Re: RE: [MW:3800] type coated Bolts carbon steel bolts ( A193 Gr. B7 ) fo Stainless steel flanges

[ukv...@iffco.nic.in]

Please inform your fluid and service conditions





Regards




U.K.Verma
Ch. Manager (Mechanical)
IFFCO,Kalol Unit,India
Phone Dir: +91-079-23282341
Phone: +91-2764-223256/223258/223272
Fax: +91-79-23286021
Mob. : 9427051953
website : www.iffco.nic.in


NOTE: Protect environment. Please do not print, unless really needed.




"Chandra Bhusan
Tripathi" To: <ran...@npcc.ae>
<cbt@rediffmail.c cc: <material...@googlegroups.com>
om> Subject: Re: RE: [MW:3800] type coated Bolts carbon steel bolts ( A193 Gr. B7 ) fo
Stainless steel flanges
12/07/2009 05:46
PM
Please respond to
materials-welding

Hi Everyone,

SS bolts are very costly and not all coustomer advise to use in all lines,
It depend how critical is your line is otherwise, galvanise bolts with
insulation washer (kit) is a cheaper option instead of SS bolts.

Regards

Chandra Bhusan Tripathi

On Sun, 06 Dec 2009 15:25:03 +0530 wrote
>


Please inform bolts are required for onshore or offshore environment.


In offshore environments,


For SS flanges, even SS304 /316 ( due to crevice corrosion problems in
corrosive atmosphere ) Bolts are not preferred,


CS Galvanised bolts are any way not preferred due to galvanic corrosion
problems ( I think )


We use


a. UNS 32760 Bolts or


b. CS/LTCS + Fluropolymer coated bolts (see attachment)


Regards,


Shivanand R Ranasaria

From: des...@toyoindia.com [mailto:des...@toyoindia.com]
>Sent: Friday, December 04, 2009 3:18 PM
>To: material...@googlegroups.com
>Cc: material...@googlegroups.com
>Subject: Re: [MW:3795] type coated Bolts carbon steel bolts ( A193 Gr. B7
) fo Stainless steel flanges



>
>Many Licensor's specification specifies A193 B7 / 2H bolts for stainless
steel flamges.
>Use of galvanised bolt not seen at all for SS flanges.
>
>Also note, A193 B7/2H bolts are not CS bolts. These are alloy steel bolts.
>
>I did not understand the stage of your project . If youare planning to buy
new one than buy ss bolts or can go for B16 / 4 bolts also.
>
>
>Thanks & Regards,
>Dhwani Desai.
>TOYO - PLANNING & PIPING DEPT.
>91-22-2573 7681.
>
>

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>Please consider the environment before printing this email
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>The information contained in this communication is intended solely for the
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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.
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