API 607 Ball Valves

[SLud]

Code requirements for ball valves being used for fuels in Quebec dictate that they be either certified API607 valves, or ULC 842 certified with an additional requirement that they be rated to a 1000 deg F melting point. I am unable to find any information that states this requirement for melting point, all information just indicates a temperature/pressure relationship for these valves. Any idea where this 1000 deg F melting point originates from? Is this a requirement for API607 valves or ULC 842 testing procedures?

 

[bcd]

Not sure where it comes from, but it does not originate in API-607. API-607 test completely envelopes the valve in flames until it is heated to between 1400 to 1800 F for 30 minutes.

 

[HitokiriAoshi]

The concept of API 607 is to simulate a plant fire. so it concentrates on the surface temperature and discount the internal temperature.

The 1000 F melting point is a commonly used temperature in the standards writing community. I've often hear about it being addressed in term of stem nut or other stem retaining parts which usually melt at lower temperature. think bronze stem nut etc.