Implications with having two gas supplies in one building

[bacon_sandwich]

Just starting on a project that involves installing a new gas supply U40 2 inch job but the client already has a very old u16 supply which is piped from a remote meter box and underground steel pipe. The pipework cannot deal with the increase in demand required (quite frankly its not really up to the current demand) and as the existing pipework is basically scrap. I have a quote to put the new supply right up to the building considerably shortening the run at 21mbar.
However i may or may not de-commission the old pipework , client wants to keep the old set up as well as having a new one.
Anybody know the rules wrt multiple supplies to industrial buildings and how do we deal with isolation etc
thx

 

[ShaunCorbs]

Are you commercially bacon ?

 

[Last Plumber]

Just starting on a project that involves installing a new gas supply U40 2 inch job but the client already has a very old u16 supply which is piped from a remote meter box and underground steel pipe. The pipework cannot deal with the increase in demand required (quite frankly its not really up to the current demand) and as the existing pipework is basically scrap. I have a quote to put the new supply right up to the building considerably shortening the run at 21mbar.
However i may or may not de-commission the old pipework , client wants to keep the old set up as well as having a new one.
Anybody know the rules wrt multiple supplies to industrial buildings and how do we deal with isolation etc
thx

You can have more than one supply to a building.
I may be missing the point here Bacon!!
lots of Buildings have more than one supply.
They won't be linked will they?

 

[bacon_sandwich]

@Shaun - yep.
I was thinking along the lines of - client smells gas, he will have to isolate at two locations unless i put in some electric valves.
One supply existing feeds, 2 X combi, 1 X warm air heater, then extends to another building where it feeds 1 X warm air heater.
New supply is really for a new process boiler circa 250KW.
However the new boiler, combis and 1 X warm air heater are all in the same "space" i.e. an industrial unit.
Hope that makes sense

 

[ShaunCorbs]

So what's going to be fed from the old meter ?

 

[bacon_sandwich]

All existing, except the new process boiler. The new boiler will be in the same unit (space) as the existing combis and warm air heater.
wish i could draw it.

 

[bacon_sandwich]

Try and make it clearer:
Option 1 : Existing U16 supply currently feeds 2X combi, 1 X warm air heater in Unit 1 and 1X warm air heater in Unit 2. This stays as is and the new supply will be dedicated to the new process boiler.
Option 2: New supply supplies new boiler and i pipe to a suitable point where it can pick up the other appliances using the existing internal pipework. It is then capped as it goes out of the building and the rest back to the old meter is redundant. Pipe is decommission and old meter is taken away.

The reason for option 1 is to provide continuity whilst this is going on and he also has extra capacity for the unknown which he likes. However i keep picking up signals that providers dont like multiple supplies and wish to disconnect the old one once i have connected the pipework together, however i cannot find out why or whats the problem, hence coming here. If its to ensure there is one method to isolate i can do this will electric isolation valves.

 

[ShaunCorbs]

seems stupid paying standing charges on two meters

if it was me i would size the new supply and meter to cope with the whole install and plant

you could get away with a u40 (u65 better)

but hay hop yes you can have two supplies just need to list / label what meter the appliance is fed off also if they have a fire alarm link a solenoid valve into that

 

[bacon_sandwich]

I think option 1 now is, i contact supply and get a new quote for a U65, this will then assure client he has enough capacity for knowns and some extra for unknowns. I can then get a company in to weld up pipe to the new boiler, drop down to 2 inch i can take it from there.
Sound like a plan...

 

[ShaunCorbs]

I think option 1 now is, i contact supply and get a new quote for a U65, this will then assure client he has enough capacity for knowns and some extra for unknowns. I can then get a company in to weld up pipe to the new boiler, drop down to 2 inch i can take it from there.
Sound like a plan...

why not press it ?

 

[bacon_sandwich]

comfort zone, lol plus no equipment, i can screw pipes up to 2 inch

 

[ShaunCorbs]

You can hire all the gear

 

[bacon_sandwich]

Ok , will look into it. just sent email off to supplier for U65 see what happens to the price.

 

[Last Plumber]

Ok , will look into it. just sent email off to supplier for U65 see what happens to the price.

You need to calculate the amount needed and that tells you the meter size required.

 

[bacon_sandwich]

You need to calculate the amount needed and that tells you the meter size required.

Deeerrrrrrr, what you on about

 

[firemant]

When I did a stint with NGrid about 3 years ago, it was a definite no-no for 2 supplies to one premises. When encountered, we had to report them, an they were scheduled for street disconnection.

 

[Last Plumber]

Deeerrrrrrr, what you on about

Deeerrrrrr? The Cheek of it!
I'm going off Shaun saying:-

you could get away with a u40 (u65 better)

Along with you not seeming to know the answers yourself.
I have not seen any mention in this thread of the volume of Gas being used so it looks like a guess.

There is no Deeeerrrrr! required here Bacon. I was trying to help because the thread reads like you are new to Commercial.

 

[Last Plumber]

When I did a stint with NGrid about 3 years ago, it was a definite no-no for 2 supplies to one premises. When encountered, we had to report them, an they were scheduled for street disconnection.

I work in plenty of Buildings where there is more than one Meter installation. They have all been installed by Nat Grid.

 

[ShaunCorbs]

Deeerrrrrr? The Cheek of it!
I'm going off Shaun saying:-

Along with you not seeming to know the answers yourself.
I have not seen any mention in this thread of the volume of Gas being used so it looks like a guess.

There is no Deeeerrrrr! required here Bacon. I was trying to help because the thread reads like you are new to Commercial.

I took it from the kw of the new boiler off the new meter and added a bit I allowed 30m3/h when the new one I around 250kw

Post 4

 

[Last Plumber]

I took it from the kw of the new boiler off the new meter and added a bit I allowed 30m3/h when the new one I around 250kw

Post 4

The new 250 Kw would work off a U25. That's why I didn't get the U40?
Unless he is adding the other appliances that the existing supply feeds but then he does not say how big the 2 warm air units are or the combi boilers.
You know yourself, a warm air unit can be any size.
It's one thing to guess a combi but not that.

That's the only reason I posted about the Gas use. It did not deserve the deeerrrrrr!.
Why not calculate the requirements accurately?
Why try to apply for an oversized meter?
The process of application asks for the gas use anyway, you can't just apply for whatever meter size you fancy as you know.