ChrisSam
Mechanical
- Feb 28, 2020
- 1
Hi Everyone.
I am a Mechanical Engineer working for a Fire & Safety company for the Oil and Gas.
I have been doing some foam proportioning tests, according to NFPA 11, and every time i do it, the foam proportion fails.
Synopsis of the Bladder tank:
1200 Horizontal bladder tank with 1 1/2" water inlet piping and 1 1/2" foam outlet piping to a 4" proportioner or ratio controller (RC) with 0.700 inches orifice size. There is a pressure reduction valve upstream of the bladder tank which takes 96 psi to the bladder system. The type of foam used is 3x6 AR AFFF foam.
Test:
I have used flow rates of 570 gpm and 950 gpm and both times these foam proportion have failed. I am using a conductivity meter and also refractive meter. Both show that the foam is proportioning at 5.2% and 6% as it should be. The tests are also conducted with the system water which has a pH level of 7.5.
Please lend some assistance.
Thank you.
I am a Mechanical Engineer working for a Fire & Safety company for the Oil and Gas.
I have been doing some foam proportioning tests, according to NFPA 11, and every time i do it, the foam proportion fails.
Synopsis of the Bladder tank:
1200 Horizontal bladder tank with 1 1/2" water inlet piping and 1 1/2" foam outlet piping to a 4" proportioner or ratio controller (RC) with 0.700 inches orifice size. There is a pressure reduction valve upstream of the bladder tank which takes 96 psi to the bladder system. The type of foam used is 3x6 AR AFFF foam.
Test:
I have used flow rates of 570 gpm and 950 gpm and both times these foam proportion have failed. I am using a conductivity meter and also refractive meter. Both show that the foam is proportioning at 5.2% and 6% as it should be. The tests are also conducted with the system water which has a pH level of 7.5.
Please lend some assistance.
Thank you.