Boilers and pressures
Boilers and pressures
(OP)
Can any body tell me how to lower the water pressure in a closed loop boiler system? This is a RAYPAK system, suction side of the pumps is sitting at 27 psi and discharge is at 70 psi and at the boiler inlet is at 27 psi and the out side is at 56 psi, and the blow off valves are rated for 60 psi so I am getting blow offs to frequently because the difference of 4 psi coming of the boiler I believe is to close.
Thanks.
Thanks.





RE: Boilers and pressures
This seems awfully high pressure drop for a boiler.
RE: Boilers and pressures
RE: Boilers and pressures
you should also be pumping away from the boilers
the expansion tank is connected to the suction side of the pump via the air separator (rolairtrol)
b&g has a program to calculate expansion tanks .... there is a formula in the code books
RE: Boilers and pressures
http://www.raypak.com/commframe.htm
RE: Boilers and pressures
you should also be pumping away from the boilers
snip
This is another piece of accepted wisdom that doesn't make any physical sense. If you pump through the boiler, you raise the pressure and hence the boiling point....the opposite is true if you pump away. You just have to recalculate the zero-pressure point to place the expansion tank, but that should be done anyway.
Bell and Gosset shows pumping away from the boiler and offers no explanation and it becomes law....poop on that
RE: Boilers and pressures