Triple offset butterfly valve vs double offset butterfly valves for throttling the flow of gas.
Triple offset butterfly valve vs double offset butterfly valves for throttling the flow of gas.
(OP)
Hello all,
For control / throttling the flow of gas, what is a better solution : triple or double offset butterfly valve (high performance) ? At the inlet low pressure, high flow, size 18'' - 24'' . What are your opinion?
Thanks a lot
Viki
For control / throttling the flow of gas, what is a better solution : triple or double offset butterfly valve (high performance) ? At the inlet low pressure, high flow, size 18'' - 24'' . What are your opinion?
Thanks a lot
Viki





RE: Triple offset butterfly valve vs double offset butterfly valves for throttling the flow of gas.
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RE: Triple offset butterfly valve vs double offset butterfly valves for throttling the flow of gas.
Agree with hsbcn: To specify valvetypes without having exact conditions is wasted time. At least the 'usual' conditions must be given: all fluid conditions (type of gas, temperature, pressure, pressure upstream, downstream, flow and at least, max, min, and medium flow, requirementts for leakage and tests etc. etc.)
Giving that this is throtteling valves, the valves geometry (ability to give laminar flow and smallest pressure lost under the given throtteling data, as opposed to turbulent or cavitation conditions and high pressure loss) will count far more than tripple or double construction.
First when you have one valve of each construction (almost) equally suitable, can you start discussing details such as triple or double construction.
RE: Triple offset butterfly valve vs double offset butterfly valves for throttling the flow of gas.
medium: nitrogen gas
flow range: min 10 000 normal from 20 000 to 32 000 max 52 000 Nm3/h (control flow).
pressure P1: 0,7 barg.
pressure P2: don't know (no pressure gauge), outlet to the atmosphere through the chimney.
at the normal working, temperature ca. 20 degC.
at the abnormal working of process / at the stop process, temperature ca. minus 90 degC.
at the stop process, butterfly valve closed - closes cold.
at the normal working of process butterfly valve control of flow / throttling of flow.
pipeline inlet / outlet DN600
failure: valve open.
air to actuator: 4-5 barg.
Viki
RE: Triple offset butterfly valve vs double offset butterfly valves for throttling the flow of gas.
Could you help me in this topic?
Viki
RE: Triple offset butterfly valve vs double offset butterfly valves for throttling the flow of gas.
I’d suggest to submit Your service condition data to some Manufacturers (of both types of valves).
As already mentioned in thread408-360754: Ball Valves Comparison with Triple Offset Butterfly Valves for Crude Oil Tank farm Area within this Forum, in the major Companies even the Sales Representatives should be able to run sizing calculations based on Your input and recommend the best solution (including economic considerations, of course)…
Regards,
’NGL