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Check the air vents on the radiators if one is missing that could screw with you. They regulate the rate of heat through the system. If you change them becareful the vents may look alike but are rated differently by rad size, floor level and loop length. If you have too much pressure like 15 lbs the safety relief valve should discharge on the floor.
 

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NICKTECH
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the p-trol (pressure control) is set to cut out at about 3 psi. the average normal boiler operates on average with less than 1 psi. normal steam pressure will vary from boiler to boiler but unless you like burnin fuel or need the pressure to travel further, then you'll see 1/4 to bout 1/2 psi on the guage
 

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the p-trol (pressure control) is set to cut out at about 3 psi. the average normal boiler operates on average with less than 1 psi. normal steam pressure will vary from boiler to boiler but unless you like burnin fuel or need the pressure to travel further, then you'll see 1/4 to bout 1/2 psi on the guage

As long as the vents are good and the pipes are insulated steam should travel just fine at 1psi.
 
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