05-03-2016, 01:12 PM
Very true Jeffrey! Hammering safety valves, terrifying. And we used to find many discharging inside in the early days, hate to think what would be the result of a blow off.
They used to be a source of leaks until the quality improved. The other common leak was the non return valve on the fill loop leaking back, and often not disconnected as it is supposed to be, leading to hose failure.
Obviously when we pressure tested at 5 bar, the boiler was isolated otherwise we would have lifted the safety and done the expansion vessel no good, it was just the pipework. valves and radiators we pressurised to ensure that there were no oozing unions or valves.
The biggest sealed system we installed had 98 radiators, 360,000 Btu's. in a seniors care home. All on push-fit plastic, no hot working allowed as the building was part occupied, and many reused radiators. The only leak we had was a 28mm elbow in a basement that had no "O" ring in one end!
Just as well because the floors were all sheeted and carpeted before we filled up!
They used to be a source of leaks until the quality improved. The other common leak was the non return valve on the fill loop leaking back, and often not disconnected as it is supposed to be, leading to hose failure.
Obviously when we pressure tested at 5 bar, the boiler was isolated otherwise we would have lifted the safety and done the expansion vessel no good, it was just the pipework. valves and radiators we pressurised to ensure that there were no oozing unions or valves.
The biggest sealed system we installed had 98 radiators, 360,000 Btu's. in a seniors care home. All on push-fit plastic, no hot working allowed as the building was part occupied, and many reused radiators. The only leak we had was a 28mm elbow in a basement that had no "O" ring in one end!
Just as well because the floors were all sheeted and carpeted before we filled up!
Boater Sam.
