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Monel should not be used in H2S service above 400°F (205°C) or Catacarb service.
For butterfly valves for water service, valve materials should be per AWWA C504 except as modified in the table below.
Buna-N rubber seat (full lining not required)
Monel; or Austenitic
Bronze; or Austenitic Stainless Steel
Monel; or Type 316
Bronze per ASTM B 584 Alloy C90500; or Type 316 Stainless Steel (2)
Monel; or Type 316 Stainless Steel (2)
(1) A valve is considered to be in throttling service when the disc is at an angle greater than 10 degrees from the full open position during normal operation.
(2) Type 316 stainless steel should not be used in services where the fluid (line) velocity, with the disc in its normal operating position, is less than 3 ft/sec (0.9 m/s) or where the disc is normally closed.
Austenitic stainless steel (Types 304, 316, 321, and 347), Monel, and nickel alloy valves should have trim, gland bolts and nuts, and yoke bolting of the same nominal chemistry as the body.
Cast Monel valve material should be specified per ASTM A 494/A 494M Grade M-35-1 or Grade M-30C. Cast Monel valve materials for hydrofluoric acid service should be Grade M-35-1 with additional requirements as specified by the client company.
Limitations on the use of copper, and copper based alloys, should be as given below for the following services:
Hydrocarbon service lighter than 68 deg API including vapor (non-lubricating service)
Steam, boiler feedwater and condensate
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