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Material requirements for gate, globe, and check valves selection?

Asked by ChemKB 5 years, 9 months ago | 3 Answers

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3 Answers

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cuchiang 5 years, 9 months ago

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.

 

Service (1)

Body Lining

Shaft

Disc

Fresh Water

Not Throttled

Buna-N rubber seat (full lining not required)

Monel; or Austenitic
Stainless Steel

Bronze; or Austenitic Stainless Steel

Throttled

Buna-N rubber

Brackish or
Salt Water

Not Throttled

Buna-N rubber

Monel; or Type 316
Stainless Steel

Bronze per ASTM B 584 Alloy C90500; or Type 316 Stainless Steel (2)

Throttled

Monel; or Type 316 Stainless Steel (2)

Notes:
(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.
0
Normandy 5 years, 9 months ago

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:

  • Ammonia:  Alloys with a copper content greater than 50 percent should not be used in ammonia service or in aqueous solutions containing ammonia where the pH exceeds 8.5.
  • Caustic and alkaline:  Alloys with a copper content less than 85 percent should not be used.
  • Acetylene:  Alloys with a copper content greater than 50 percent should not be used in services where acetylene in a wet environment is present.
0
Normandy 5 years, 9 months ago

Trim Requirements

Service Nominal Trim Material
(per API 600)
Hydrocarbon service 68 deg API (0.709 relative density) and heavier and other lubricating type service Trim #1 or #8
Caustic Trim #1 or #8
Water, air, or inert gas  Trim #1 or #8
Wet H2S Trim #2, #3, #5, #8 , #9, #10, #11, #12, #13 or #14

Hydrocarbon service lighter than 68 deg API including vapor (non-lubricating service)

  • Up to 900°F (480°C) maximum fluid design temperature
  • Over 900°F (480°C) maximum fluid design temperature

 

 

  • Trim #8
  • Trim #5

Steam, boiler feedwater and condensate 

  • Class 150 and 300
  • Class 600 and higher

 

  • Trim #8
  • Trim #5

 

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