Worcester Gas Rating

[billy_smith]

Hi all,

Anyone any idea if there is any tolereances with the gas rate on a Greenstar 37CDI?

M/I ask for 3.9,I've gas rated twice tonight so far and I'm getting 3.4

 

[bengasman]

Why not ask W-B?
In my experience they tend to be a bit more rather than less if anything.
What is inlet pressure when going full blast?

 

[billy_smith]

Working pressure at the boiler is 20mb,All other readings with the FGA are as per M/I specs,I was just curious too see if there was a tolerance with the gas rating,I know Valliant have a minimum and maximum on the gas rating.

Cheers

 

[holty]

about 5%+ or - of the original reading.

 

[holty]

thats on the input of the kw though. when gas rating are you doing it to work out the kw net. or m3/h.

 

[billy_smith]

m3/h mate

 

[holty]

id stick with the original gas rating formula if i were you.1st reading -2nd reading x30x38.79/3600=/1.11 thats acceptable to give you kw.then i think x 0.09 will give you m3/h

 

[woogas]

Easiest way
2nd reading - 1st reading = 0.081 m3 eg (over 2 mins)

x 30 to give m3/hr = 2.43 m3/hr eg

x 10.76 to give KW gross = 26.15 KW gross eg

/1.11 to give KW net

so 2nd - 1st x 30 x 10.76 /1.11 to give KW net


I usually use x 10.7 to give KW gross mj/m3 x 1000 / 3600