LPG inlet pressure

[Jay_1981]

Very rarely work on LPG (and yes I do have LPG cert) was looking for someone with more experience on LPG, basically I have noticed on the past 3 LPG jobs inlet pressure at blr was low 28-33mb, ecv to house was approx 2-4m from blr and from the ecv was 22mm pipe, has anyone else come across similar problems. (oh and all the tanks did have a reasonable amount of gas left)

 

[Mike Jackson]

Was the upso opso on the tank or on the house wall?

 

[fatoftheland]

check the minimum inlet pressure on in the boiler manual. If the second stage regulator is at the tank it can lead to pressure drop at the other end. I have actually seen 10mm pipe fronm the tank to the outside wall of the house. This was fine when the second stage regulator was there but a ne wtank was fitted with all the pressure controls built in. This means that LPG at 37mbar was trying to squeeze through the 10mm pipe hence a massive pressure drop at the boiler inlet when firing. If you have low pressure without any appliances firing you have regulator problem.

 

[Jay_1981]

Problems were all when appliances firing at full rate 20-32KW and two of controls were on tank, the other was on calor bottles on other side of the wall that blr was mounted on. As I said, just looking for what some others have had experience with regarding inlet pressures. As I understand it the company supplying gas usually owns the tank, how are they usually when it comes to inspecting/replaceing govenors (as I said LPG qualified but rarely use it)

Thanks for all input

 

[fatoftheland]

Check on the regulators how much gas in Kw/h (probably) can throughput the pipework. Bigger tanks are used not solely for more storage but also so more Vapour can boil off the liquid gas during high demand

 

[Jay_1981]

nice tip, how much will a drop in temp affect the tank, these last few jobs occured during the cold snap with the outside temp ranging from -3 to +4/5deg C

 

[Mike Jackson]

Boiling point of commercial propane is -42.