High temperature Exhaust Piping -Bolts and Gaskets
High temperature Exhaust Piping -Bolts and Gaskets
(OP)
Dear members
In one of our construction , we have 32 In Carbon steel line used in a exhaust line of a diesel engine.
Design temp: 460 Deg C, Design pr: 10 bar.
The following are our queries
1) In the dissimilar flange joint between Expansion bellow ( Material ASTM A 182 gr F 316L)and Pipe flange ( Material ASTM A 105) the supplied fasteners are of ASTM A 193 Gr B7 and A 194 Gr 2H material.
Since the CS fasteners will bein contact with SS flange,
we would like to know the types of isolation kits available in the market which can withstand the design temp of 460 Deg C or any other suitable methods to prevent galvanic corrosion because of SS to CS contacts.
2) Secondly we are looking for a suitable non asbestos gasket to be used at the dissimilar flange joint which can withstand the same design temperature of 460 Deg C
Any help or suggestions to the above queries from experts in this forum will be appreciated
Sree60





RE: High temperature Exhaust Piping -Bolts and Gaskets
RE: High temperature Exhaust Piping -Bolts and Gaskets
Penpiper
Can u give the link which u mentioned?
Thanks
sree60
RE: High temperature Exhaust Piping -Bolts and Gaskets
I'm not a corrosion expert but I thought you needed the presence of electrolytes for galvanic corrosion and I can't see that happening at 460 deg. C.
In any case CS to SS is common in piping with out isolation.
Hopefully your flange is not going to be insulated but if it is, I would recommend using B16 bolts and Gr. 4 nuts instead of the ones you mentioned.
Also, a reinforced graphite gasket will be suitable for your service. Get with a gasket manufacturer as there may be cheaper alternatives. I've pasted a couple of gasket links below.
http://www.lamonsgasket.com/
http://www.flexitallic.com/
NozzleTwister
Houston, Texas
RE: High temperature Exhaust Piping -Bolts and Gaskets
RE: High temperature Exhaust Piping -Bolts and Gaskets
Regards,
Mike
RE: High temperature Exhaust Piping -Bolts and Gaskets
Diesels half that size limit exhaust backpressure to five inches of water. You don't need heavy pipe or ANSI flanges to deal with that little pressure.
You won't have galvanic corrosion. You will need anti-seize on the bolts no matter what material they are.
Mike Halloran
Pembroke Pines, FL, USA
RE: High temperature Exhaust Piping -Bolts and Gaskets
The catalog that I have is dated January 1996
253 Darco Drive
Independence VA 24348
800-327-2610
540-773-2711
RE: High temperature Exhaust Piping -Bolts and Gaskets
http://www
RE: High temperature Exhaust Piping -Bolts and Gaskets
Dear members
Thanks to all for your valuable inputs
sree60
RE: High temperature Exhaust Piping -Bolts and Gaskets