Pressure drop across gas pipe

[Rtm]

Currently having an issue I can't figure out and could do with maybe some pointers from some of the more experienced members on here. Standing pressure at meter is 22.9 mbar and working pressure in 21.8mbar at inlet to boiler working pressure drops to 10mbar. It's a short pipe run so undersized pipework is definitely not the cause. All visible pipework appears undamaged as well. What could cause such a large pressure drop across say 5m of gas pipe? Property has been vacant for a few months and unused if that makes any difference. Any suggestions would be appreciated

 

[ShaunCorbs]

Get the networks out to check the regulator

 

[Rtm]

Get the networks out to check the regulator

Working pressure is fine at the meter though just by the time it gets to an old bbu it's dropped to 10mbar at the inlet to the gas valve

 

[Harvest Fields]

Get the networks out to check the regulator

Or a collapsed main. Had one earlier in the year when the old main had collapsed. Vaillant Ecotec plus I had fittedthe year before running on 8mb full load

 

[Rtm]

Would that not show up when I'm taking working pressure at the meter?

 

[Harvest Fields]

Would that not show up when I'm taking working pressure at the meter?[/QUOTE
Yes

 

[Harvest Fields]

Are you Gas safe registered?

 

[sammathias]

Have you not checked for a blockage.

 

[Scott_D]

What boiler?
Where you taking the inlet pressure?

 

[townfanjon]

Public forum!!!!

 

[Rtm]

It's an old baxi bermuda bbu. Taking inlet pressure off the inlet at gas valve and also off the gas fire in front of it. Yes I'm gas safe, newly qualified.

 

[townfanjon]

It's an old baxi bermuda bbu. Taking inlet pressure off the inlet at gas valve and also off the gas fire in front of it. Yes I'm gas safe, newly qualified.

See our leader pal @ShaunCorbs

 

[Mark K]

Working pressure is fine at the meter though just by the time it gets to an old bbu it's dropped to 10mbar at the inlet to the gas valve

You have to understand the difference and interaction between flow and pressure. If you have enough standing pressure, but it drops too much when wotking, you do not have enough flow. You have been given the probable answers above, faulty regulator or problem with the main. Think of it as, when the boiler fires, it uses gas, which must be replaced by the same amount of gas flowing in from the main to replace it, or there will be less gas in the pipe. Less gas = less pressure. Slow flowing gas will still build up pressure when it is not being used.

 

[ATPlumb]

I had the same issue once on an install of a replacement boiler. Contacted the gas supplier who changed the regulator and problem solved.

 

[sammathias]

If you got 21mb working pressure at meter but 10mb at appliance ...how is that a faulty regulator?

 

[sammathias]

Sorry public forum

 

[Mark K]

If you got 21mb working pressure at meter but 10mb at appliance ...how is that a faulty regulator?

Fair point re-reading it, I read that he only checked standing pressure at the meter.

 

[king of pipes]

Where are you measuring the 10mbar working pressure on the gas valve ? Rigbt or left test point . Kop

 

[Gofo]

hello all , i am also a newby but have 40 years in refrigeration and a/c . would it be safe to say , have you checked the pressure at the meter when app is running as well , and if it is acceptable then it is either the regulator , pipe damage/blockage ?

 

[tolly]

hello all , i am also a newby but have 40 years in refrigeration and a/c . would it be safe to say , have you checked the pressure at the meter when app is running as well , and if it is acceptable then it is either the regulator , pipe damage/blockage ?

Gofo, if he has 21mb working pressure at meter it cant be the regulator...the regulator is upstream of the meter test nipple.

Assuming hes not taking a burner pressure reading its either a blockage or GV to blame

 

[townfanjon]

PUBLIC FORUM , PUBLIC FORUM , PUBLIC FORUM