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: desaid@toyoindia.com [mailto:desaid@toyoindia.com]
>Sent: Friday, December 04, 2009 3:18 PM
>To: materials-welding@googlegroups.com
>Cc: materials-welding@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
|
|
>
>
>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
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