FUGITIVE EMISSIONS IN BALL VALVE 2

[EngGab]

Hello dear, I need your help.

Do you apply the fugitive emissions test for ball valves at 3/4" and 1/2"?

In this case, what is the corresponding standard?[highlight #729FCF][/highlight]

These valves are required for the installation of pressure and temperature indicators (PI and PIT) on a COMBUSTIBLE GAS line. The pressure ranges are 1100 psig at the inlet and after regulation 400 psig and 50PSIG. The client is requesting of fugitive emissions test API 624/ISO 15848 for these valves, so I am giving myself the task of checking if this is correct. So far it has been difficult to find a supplier that meets this requirement for this type of valve in these diameters.

In advance thank you for your support

 

[Danlap]

Hi,

Question 1: Yes. Most of refineries in (western) Europe are bound to this emission act.
Corresponding standard indeed ISO 15848. If you want to give yourself a check suggest to buy this standard.

Depending on the toxicity level, the total emission leakage from leakage path e.g. body to body connection, gland should be smaller than Class A, B or C.
Is it hard to achieve? I would say moderate challenge, since it would requires
Quote from ISO 15848:
The required minimum number of mechanical cycles for isolating valves shall be 205 cycles (full stroke) with two thermal cycles (a total of 50 cycles at RT, 50 cycles at test temperature, 50 cycles at RT, 50 cycles at test temperature and 5 cycles at RT).
Unquote....To be done at maximum allowable working pressure as stipulated in standard e.g. ASME B16.34
It is quite challenging since most ball valve this size use PTFE and or Viton sealing component, a few design use graphite (which add friction on operating torque). Please note that PTFE and O-ring may subject to thermal expansion, creep and or brittle. Therefore after several cycle the fugitive emission value normally will be bigger on standard design

Within all cycle, as minimum the measured value for these attributes must remain the same or at allowable tolerance: fugitive emission and torque value.
Also to add, some end user requires Notified Body to witness this process.

Go to known manufacturer that used to supply ball valve within this region, they should be able to supply as per your requirement. Asking any manufacturer to start this endeavour for sure will consume R&D cost, time and more. With possibility of failures at several first attempt. This cost cannot be justified by just supplying dozens of this let say 1/2"-300# valve for unit price of 200-300EUR.

Goodluck,
Regards,
MR

https://nosuchvalve.com

All valves will last for years, except the ones that were poorly manufactured; are still wrongly operated and or were wrongly selected

http://www.eng-tips.com/faqs.cfm?&rat1=2&fid=376

 

[EngGab]

Thanks Danlap,... and an apology for the delay in responding. I want you to know that your contribution helped me.

I'm still learning about these tests, but I'm still investigating.

Thank you.

 

[Compositepro]

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