THREADED BALL VALVES COULD MEET API-6D?

[ALEXANDRAHARPER]

FLOATING THREADED BALL VALVES COULD MEET API-6D?

 

[JimCasey]

API 6D doesn't exclude threaded valves specifically but the text addresses flanged valves or weld-end valves without mentioning npt

The big loophole is on page 34 in paragraph 6.7.3 where the standard says:" Other end connections such as special flanges or mechanical joints may be specified by the purchaser"

 

[BigInch]

Hola,

Que si.

http://www.made-in-china.com/showro...na-Female-Threaded-Two-Pieces-Ball-Valve.html

Going the Big Inch!

http://virtualpipeline.spaces.msn.com

 

[JLSeagull]

Other mentions of "threaded" in API 6D include 6.9 pertaining to bypass, drain and vent connetions and plug entries to be drilled and threaded; and the associated table 7.

Note that 6.1 and 7.1 reference ASME B16.34 (or an equivalent standard by agrement).

ASME B16.34 excludes threaded and socket weld valves larger than NPS 2 1/2.

 

[ALEXANDRAHARPER]

are you sure that floating ball valves 1500/thd could meet API-6D?, A supplier of KF valves told me that only floating ball valves RF meet API-6D.

Im pretty confuse rightb now

 

[JLSeagull]

Avoid any confusion - don't specify threaded valves for process service as the first block. You can see that exceptions may exist in small sizes that accommodate vent and drain valves through 2 1/2 NPS.

In instrumentation we use threaded instrument valves downstream of a line class block valve. However, I only buy flanged line-class valves like shutdown valves and control valves for hydrocarbon applications. API 6D is a common requirement for oil and gas applications. ASME B16.34 is another widely used valve requirement. Obtain copies of these standards.