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cold embrittlement protection

cold embrittlement protection

cold embrittlement protection

(OP)
hi all,
new in the business, and i m asked to design a cold embrittlement protection for carbon steel piping of a custumer downstream a LIN vaporisation facility .the custumer does not allow a GAN supply cut for his process (inerting and blanketting).Any suggestions ? All will be welcome

RE: cold embrittlement protection

There are 2 basic ways of doing this.
1. The most obvious is to put a thermocouple or other measuring device in the line and tie it into a valve that closes when a low temperature has been reached.  This works fine if you have power close by and a control panel to operate it.  But it's a bit overkill.
2. The all mechanical method uses a valve that is held open by gas pressure.  The gas pressure is connected to a bulb through a short hose that's immersed in the flow stream.  When the temperature drops, the gas in the bulb condenses and the valve loses the pressure and closes.  Kaye & MacDonald makes the valve and the entire assembly can be purchased from ACME Cryogenics.
http://www.acmecryo.com/index.cfm/fuseAction/Catalog.Product/productID/14.cfm?CFID=30177903&CFTOKEN=82912996

I'm sure there are other suppliers of such valves and other manufacturers that will sell you a manifold with one installed but I don't know who else does this.

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