MESC for butterfly valves. There's a lot of Shell designation numbers and documents that undergo this acronym. If you look for the Shell Specification for butterfly valves, may be you'll want to refer to Shell MESC SPE 77/134 (Revision: 27-09-2002) document... In any case, I suggest you to directly contact "Shell Global Solutions B.V." which is in charge of all this issues: see, for example, my post of August 5th, 2003 on the Thread408-64093 within this Forum, for the relevant website address. The only way to have them quickly is to pay the access to the Shell (SIPM) web site where you can download all data in few seconds.

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