gas rating boilers

[watsonderek]

how do i gas rate a potterton powermax he store

 

[andyg0507]

are you gsr??

 

[watsonderek]

no im not

 

[andyg0507]

what is you want to find out? the gas consumption of your boiler?

 

[sparra1100]

to hard to explain anyway its one of them you have to be shown ,do it 5 times and hope it sinks in takes a week to get it right and then consult the corgi book

 

[fuzzy]

if your not gsr why do you want to gas rate? just to work out how much gas your using?

 

[Deleted member 25704]

Allow heat store to cool, so maximum burn is measured.

For imperial meters, with rotating dial. Time one revolution of the meter dial when the boiler is on full burn, with thermostat on max. This will give you the number of seconds for one revolution.

Then using the constant 1064, divide this by the number of seconds for the revolution.

The number you get from this division is the KW rating of the appliance.

 

[fuzzy]

important to note that gas rate and heat input are different

 

[Barry98]

also be better posted in the right section

thanks



Sorted :yesnod:

 

[mcniven]

or use the handy new iphone app

' gas installer ' 😀 😀 😀

 

[southcoastboile]

this is the way i have been doing it, there are many different ways but these are the 2 i can remember, feel free to tell me if you think theres anything wrong with doing it this way, for imperial meters: boiler at max, count secs per rev on dial. then i do 3600x1040 divide by secs per rev then divide by 3412.
for metric meters, i take a reading, fire boiler on max, time for 2 mins, take 1 reading from the other, divide by 2, x60, x35.37, x1040, divide by 3412

 

[gasmarc]

not meaning to be a smart alex but I just press stop and start on the phone and the app works it out

 

[chelsea]

i was taught this way

metric 3600x(how many seconds over 2 minutes)x10.76
divided by 120 = total in kws

imperial 3600x1040 divide by example 50 seconds total in BTUs then divide 3412= kw gross

 

[keltoyboy]

this is the way i have been doing it, there are many different ways but these are the 2 i can remember, feel free to tell me if you think theres anything wrong with doing it this way, for imperial meters: boiler at max, count secs per rev on dial. then i do 3600x1040 divide by secs per rev then divide by 3412.
for metric meters, i take a reading, fire boiler on max, time for 2 mins, take 1 reading from the other, divide by 2, x60, x35.37, x1040, divide by 3412

hi south....seems a lot of maths to me and more chance to make a mistake......we both get same result but i was taught the simpler sum (due to my mental mathematics....ha ha!!)
fire boiler on max....take reading......time for 2 minutes......take reading.....subtract second reading from first.....multiply by 30......then multiply by c.v. 10.8 =

 

[gasmarc]

Thank God for the app I use to write the numbers down and run the appliance and subtract and look it up on the chart

 

[keltoyboy]

Thank God for the app I use to write the numbers down and run the appliance and subtract and look it up on the chart

must download the app.......how accurate is it marc??

 

[gasmarc]

it works fine I have never had any problem with it just press stop and go and it gives you the results net and gross, I prefer to do the burner pressure when doing gas land certs but sometimes just gas rate if access is a issue , opening a can of worms now lol

 

[keltoyboy]

it works fine I have never had any problem with it just press stop and go and it gives you the results net and gross, I prefer to do the burner pressure when doing gas land certs but sometimes just gas rate if access is a issue , opening a can of worms now lol

And you get how much from the landlords.......????? ha ha!!! (ok lets not open the can of worms)

 

[SimonJohns]

hi south....seems a lot of maths to me and more chance to make a mistake......we both get same result but i was taught the simpler sum (due to my mental mathematics....ha ha!!)
fire boiler on max....take reading......time for 2 minutes......take reading.....subtract second reading from first.....multiply by 30......then multiply by c.v. 10.8 =

Just multiply your reading for 2 mins by 323

 

[gasmarc]

Now that sounds simple subtract one from the other and multiply by 323
but where do you get 323 from please ?

 

[southcoastboile]

your way is definitly simpler, i got the metric way of doing it from the viper book and just always remembered the imperial from when i 1st did my acs, alot easyer to use the iphone ap but always handy to know how to work it out if you need to.

 

[SimonJohns]

Now that sounds simple subtract one from the other and multiply by 323
but where do you get 323 from please ?

Ok. Answer x30
X 10.76 (kw of gas per m3)
= answer

30x10.76= 323. The reason this calculation works is. Bacause my calorific value remains constant at 10.76.

It rules out all the other constants

 

[warrington]

important to note that gas rate and heat input are different

I agree to fuzzy, still same mistake, gas rate and heat input are different. Been with many engineer and they still calculate heat input and saying it is gas rate.

 

[keltoyboy]

Ok. Answer x30
X 10.76 (kw of gas per m3)
= answer

30x10.76= 323. The reason this calculation works is. Bacause my calorific value remains constant at 10.76.

It rules out all the other constants

Thats if your cv remains constant.......we are told to check the gas bill as the cv varies from region to region...from 10.8 to 11.4....

 

[GQuigley67]

imperial was 1 revolution/1098

and for metric multipy by 321 for me, i think its because its the easiest to remember, it will still be accurate enough to work within the tolerances allowed anyway, but i have to admit i just use my app now

 

[garythegas]

switch boiler on max,watch last 3 figures on meter for 37secs e.g. (.021 to.049)subtract 1st reading from second reading and your answer is in kw,e.g.28kw,easy.

 

[GQuigley67]

37 seconds ?? never heard that one, its not gas rating though thats heat input

 

[garythegas]

yes it is input,used it many times ,give it a try

 

[gasmarc]

I never stop learning in this game 😛unk:

 

[GQuigley67]

i have been told that we are not allowed to use the apps as they are not accurate, is this true ??

Also has anyone got a simple calculation for working out how many ft/hr your using ? I find the metric one easy but not the imperial one.

 

[southcoastboile]

i have been told that we are not allowed to use the apps as they are not accurate, is this true ??

Also has anyone got a simple calculation for working out how many ft/hr your using ? I find the metric one easy but not the imperial one.

When I had my inspection the inspector said he is a fan of making life simple and said if you have the iphone app then use it.

 

[GQuigley67]

not what i have been told and have seen people being dug up for using the app and asked to do the calcuations.

although i may add this is a gas board inspector

 

[ADM360]

I Have an android app that I'm starting to use, couple of clicks and you have your answer! but I still do a manual calc every now and again, keep the brain fresh and confirm app is working. I can't see any problem with use tools to make life easier, it's not a lot different to use a ventilation slide rule to cut out the math, but you still need to know how to do it all manually!!

Might have opened the other end of the can!!!

 

[southcoastboile]

not what i have been told and have seen people being dug up for using the app and asked to do the calcuations.

although i may add this is a gas board inspector

Thats what I was told and also a mate of mine used a gas rate ap on his inspection with a different inspector to the one I had. If i was offering advice to somone who was having an inspection I would say learn the gas rate calculations just incase.

 

[GQuigley67]

i used to use the app on my htc but its broke and i haven't claimed it on the insurance yet, using another phone at the moment so doing it manually now, the only problem i have is calculating ft/hr.

When working on imperial meters I times how long for one revolution then divide that by 1098, divide 1.11 to get heat input, anyone got a simple calcuation to convert kw to ft/hr ?