Commercial Gas Meter
- Thread starter darkart
- Start date
270kw give or take.
That is 25 cu/metres per hour. It will give approx 258kW.
It does have an overload so it will do that.
H
Hot&Cold
Hard-work,you have experience of diaphragm operated volume measuring gas meters
which is interesting for some.. please can you confirm your calculations to provide some evidence of allowable overload on this itron u25 diaphragm operated natural gas measuring device.please also include all positive or negative reasons why overload is acceptable.it should not be hard-work
I think that translates to "haven't got a clue"
If only only you knew, which you do not. Stick to drains.
H
Hot&Cold
A very poor effort of an explanation,absolutely incorrect,misleading and a gas safety issue.
Hard-work,you have noticed the meter badge
. There are 2 clues which indicates your #4 reply is totally incorrect. Please refrain from issuing potentially dangerous information in this thread and others Have a nice day and consider going back to mumsnet to troll there
Nowt wrong with drains fella! Without them, you for one would be up to your ears in it, with all the **** you put out.
I fully agree with you. Those who do drains should stick to them, as they are essential, and not wander off into unknown territory messing things up.
Old&Cold, when I assessed metres it was a 100% overload. 
These days they say keep to the maximum rating. i.e., 6 cu/mtrs on a U6. The question was:
What is the Maximum KW boiler will a U25 gas meter feed?
I replied correctly, 258kW. But this is ballpark as kW depends on boiler efficiency. The gas consumption of the appliance must not exceed the meter rating. But you have to use common sense. If a boiler is rated above the max of the meter then it is fine as that is peak and the boiler will modulate down below the max of the meter. If it is a continuous gas drawing appliance, then no, it must be below max. The meter can cope with an overload for a short period, not continuous. The gas authorities say to installers do not go over the max of the rated meter, to cover themselves. They themselves may do something else.
When natural gas was proposed in the 1960s, a number of meter sizes were standardised on, U6 and U16. 6 cu/m hr (212 cu foot per hr) and 16 cu m/hr. A U6 was designed to cope with the vast majority of domestic homes. Previously they had many sizes, a 3 cu/m hr (3/4" connections) and 3.75 cu m/hr - 250 cu foot per hour, which was slightly smaller in size than a U6 and developed at the same time, but was dropped after a few years. There was 400 cu ft/hr and 880 cu/ft/hr for town gas.
When converting from town gas to NG the distribution system could cope as pressure doubled with pipes already large bore to cope with lower pressure and lower CV town gas. The home gas installation pipes were instantly oversized. The CV of the NG was higher, able to deliver twice as much heat into a home down the same service pipe. Each premises house was supposed to consume 6 cu/m hr if the need was there. They have cut back on this, skimping on mains distribution, taking an average for a district. A U6 can give approx 62kw of heat.
These days they say keep to the maximum rating. i.e., 6 cu/mtrs on a U6. The question was:What is the Maximum KW boiler will a U25 gas meter feed?
I replied correctly, 258kW. But this is ballpark as kW depends on boiler efficiency. The gas consumption of the appliance must not exceed the meter rating. But you have to use common sense. If a boiler is rated above the max of the meter then it is fine as that is peak and the boiler will modulate down below the max of the meter. If it is a continuous gas drawing appliance, then no, it must be below max. The meter can cope with an overload for a short period, not continuous. The gas authorities say to installers do not go over the max of the rated meter, to cover themselves. They themselves may do something else.
When natural gas was proposed in the 1960s, a number of meter sizes were standardised on, U6 and U16. 6 cu/m hr (212 cu foot per hr) and 16 cu m/hr. A U6 was designed to cope with the vast majority of domestic homes. Previously they had many sizes, a 3 cu/m hr (3/4" connections) and 3.75 cu m/hr - 250 cu foot per hour, which was slightly smaller in size than a U6 and developed at the same time, but was dropped after a few years. There was 400 cu ft/hr and 880 cu/ft/hr for town gas.
When converting from town gas to NG the distribution system could cope as pressure doubled with pipes already large bore to cope with lower pressure and lower CV town gas. The home gas installation pipes were instantly oversized. The CV of the NG was higher, able to deliver twice as much heat into a home down the same service pipe. Each premises house was supposed to consume 6 cu/m hr if the need was there. They have cut back on this, skimping on mains distribution, taking an average for a district. A U6 can give approx 62kw of heat.
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Just out of curiosity - what happens if it is is overloaded longterm? Does it wear out prematurely? It doesn't sound like thrashing an IC engine, or running an electric motor above rated load.
They do make a racket. Running a U6 just under 6 cu m/hr a makes a racket. They can obviously wear out quicker, but the makers say it is OK for many, many years and years. A meter serving a small hob and one running on max, well the latter will wear out quicker, but they have made wedge in money from gas sales, so they do not worry too much about replacing a meter.
A few years back, in a largish house with gas only for heating I recommended two 25kW Intergas Rapid combis. They consumed 3.02 cu metres/hr when full on. Two is 6.04 cu m/hr. A tad over, but it would only be drawing this volume when two showers are on full draw in winter. Both were aerated rainfall showers at 9 l/min. The space heating was turned down on both combis, so when both on full space heating they would be both well below the meter limit. The likelihood of full gas consumption, when two showers are on full, was very slight. In this case the rare slight overload is not a problem.
If my memory is right, the Intergas DHW can be tuned to be be just below 3 cu m/hr. Cue Intergas Plantpots.
A few years back, in a largish house with gas only for heating I recommended two 25kW Intergas Rapid combis. They consumed 3.02 cu metres/hr when full on. Two is 6.04 cu m/hr. A tad over, but it would only be drawing this volume when two showers are on full draw in winter. Both were aerated rainfall showers at 9 l/min. The space heating was turned down on both combis, so when both on full space heating they would be both well below the meter limit. The likelihood of full gas consumption, when two showers are on full, was very slight. In this case the rare slight overload is not a problem.
If my memory is right, the Intergas DHW can be tuned to be be just below 3 cu m/hr. Cue Intergas Plantpots.
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