Dear All,
I have modeled my case using real air valve data. At one place it's showing large vapor volume. Surge is under the permissible limit.
Can a air valve handle this volume or what should I do to reduce the vapor volume ?
Air valve spec details also attached.
Model has add one 50mm dia double acting air valve at the pump house and 100mm dia. Triple acting air valves at about 250-300m, 800-850m, 1150m distances.
Looking forward to hearing from you.
Thank You.
Ishanka Wimalaweera
Hello Ishanka,
Have you tried using the air-valves in the system? How much is the reduction in the vapor volume when air valves are used?
When using any surge protection equipment, the purpose of using it is to mitigate the transients produced in the system. Using the right equipment such as an air-valve or a surge tank depends on how effectively the transients are reduced in your system. Besides this, one should also consider the project cost of these equipment, available space and installation considering the project requirements.
The best way would be to try using several surge mitigation options such as using air-valves, surge tanks, hydropneumatic tanks etc. and check how each of these are effective in mitigating the transients produced.
Here are some informative articles which can help you;
Modeling Reference - Air Valves
Protective Equipment [FAQ]
Hope this helps.
Regards,
Yashodhan Joshi
Dear Joshi,
Thank you for the reply. I have used the air valves in the system as well, but significant reduction in the vapor volume was not noticed. We have used 5000L surge tank at the pump house (0m chainage). I will try combination of surge mitigation measures as suggested by you.
Best Regards,
Ishanka.