help needed working out gas flow rates

[Glenn042]

hi,i am about to take my CITB course in December,and have been looking into gas flow rates,i've decided to try to have a go at working them out before my course starts, and have been testing myself at home...i was wondering if the following flow rates are correct for the appliance KWs i have given myself to work on
Based on a CV of 38.5
10KW = 0.936 m3
7KW = 0.654 m3
8KW = 0.748 m3
9KW = 0.828 m3
15KW = 1.402 m3
I'm not sure if these figures are correct,so if anyone can help me,i would appreciate it!
i have had no previous experience with gas,so please go easy on me!...i have found that the gas industry seems a great and rewarding job to get into,so i want to give this 110%
thanks for your time

 

[thomas donovan]

i was taught to multiply the kw by 0.095 so 10 kw = 0.95m3 per hour. this is what is in my training manual.
good luck with the course

 

[kirkgas]

i was taught to multiply the kw by 0.095 so 10 kw = 0.95m3 per hour. this is what is in my training manual.
good luck with the course

i multiply kw by 0.094

 

[tamz]

I divide it by 10.65

 

[grahamgas]

I was taught to divide by 10.77!

 

[thomas donovan]

my way is the best
i done my course with logic and they said that the gods told them it was 0.095

 

[thomas donovan]

and that was last year. stop living in the past fellas

 

[fuzzy]

my way is the best
i done my course with logic and they said that the gods told them it was 0.095

thats rounded up and therefore a bit rough, it should be 0.0949

 

[Billy Bob Bob]

0.094,thats what i divide by

 

[kirkgas]

0.094,thats what i divide by

you would get a more accurate answer if you multiplied the HI by 0.094, rather than divided it

 

[Billy Bob Bob]

you would get a more accurate answer if you multiplied the HI by 0.094, rather than divided it

sorry mis print

 

[tamz]

To do it quite (still not totally) accurate you need the calorific value divided by 3.6.
In the OP's example,
using a calorific value of 38.5/3.6 = 10.694
10kw / 10.694 = 0.935

The calorific value of the gas is different in different parts of the country

So say in an area where the cv is 38.5, a 24kw boiler could be expected to need 2.244m3hr of gas.
Up here the cv is around 39.5 so 39.5/3.6=10.972. 24/10.972=2.187m3/hr
All pretty easy to remember

Just use whatever factor sticks in your head. It will never be 100% accurate without some serious calculations you don't need or particularly want to know

 

[madharris]

i was taught the to use 10.76 for the CV in my gas rate calcs ie, 3600 x m3 x CV.10.76 / secs in test

 

[metaldust9]

divide by 10.76 and if gross devide that by 1.11