gas rates

[lordyjordy111]

hi

as I said in a previous post I had my acs today...

any way I had to gas rate a boiler and the data badge said at max burner pressure appliance should be 15.22kw NET input

my question is when you gas rate from a meter that figure must be gross (every time) ie given amount of gas gives a given amount of energy

but net figures you should divide by 1.11 to get net

is this true??

once again thanks

 

[diamondgas]

You divide gross by 1.11 to get net or multiply gas rate (m[SUP]3[/SUP]) by 34.7 then divide by 3.6 to get net! That wasn't from memory, by-the-way, as I carry a cheat list 🙂 taken from a book 🙂

 

[TBServices]

Haha, I remember my first gas safe inspection. Started doing the longhand sums for the gas rate and the gas safe bloke just said, "what you doing that for? Don't you have the books?"

Moral of the story. Don't panic! We're all human.


Sent from my iPad using Tapatalk HD

 

[REDSAW]

am i alone?

i am tosh? i can only remember metric to nett top of my head!!!!

 

[buckley plumb]

glow worm boiler data badges confuse me at times some dont say net or gross just "P" and "q"

ant

 

[REDSAW]

lol, had that today,

 

[Deleted member 32524]

Metric 2nd reading minus 1 st reading x 321. Imperial 1098 divided by time taken to do on revolution. divide by 1.11 to get net.

 

[galaxy_plumbing]

Duncan, where did you get that formula from? 😀 Never seen anything like it. Metric is ((2nd-1st)*3600*10.76)/time in gross so divide 1.11. Imperial (1040*3600)/3412/time, again divide 1.11. If its new boiler, badge will be in net.

It seems that everybody is doing it different way.

 

[REDSAW]

nothing sweeter than 'time x 321'
it the imperials that get me as i dont see that many.

 

[SimonJohns]

3600x 10.76/120 = 322.8

It's just a simplified version of the mathematics. I use 323 (Mazda 323) some people use 321

It's a quicker way of doin it and just as accurate

 

[galaxy_plumbing]

Yea, just forgot that time is not always 120 😛, if you wanna be accurate like NASA 😀

 

[SimonJohns]

Yea, just forgot that time is not always 120 😛, if you wanna be accurate like NASA 😀

You shouldnt be doing a gas rate less than 120 secs 😉

 

[galaxy_plumbing]

You could be doing gas rate on oven hob and wait ages to around 0,010 😀

 

[JAP&H]

Anyone using gas rate smart phone app, believe its the modern version of gascalc.

Any good, worth the money or gimmick?

 

[SimonJohns]

Jap&h

I'm a firm believer that you should be able to do this without technology

One day your iPhone will be flat and all you will have it a pen and paper. Learn the hard way. And do it proper

 

[JAP&H]

Jap&h

I'm a firm believer that you should be able to do this without technology

One day your iPhone will be flat and all you will have it a pen and paper. Learn the hard way. And do it proper

Don't get me wrong Simon, always use stopwatch notebook and pencil, just wondered whether the app was any good.

 

[SimonJohns]

Jap&h

Ok. But if you do have an iPhone. Wouldn't it be cheaper to use the calculator and 323 it than pay £0.60 for an app that does just that?

 

[lordyjordy111]

Hi everyone

thanks for your answers but that wasn't really my question....

what i was aking is that when you take a reading from a meter is that figure always a gross figure?

and btw I use mr combi's gas rate calc seems to be pretty goood... i'm too lazy to use the calculator😛hone:

 

[galaxy_plumbing]

yes, meter figure is gross 😉

 

[REDSAW]

now he tells us!!!!!!!!

 

[Deleted member 32524]

Duncan, where did you get that formula from? 😀 Never seen anything like it. Metric is ((2nd-1st)*3600*10.76)/time in gross so divide 1.11. Imperial (1040*3600)/3412/time, again divide 1.11. If its new boiler, badge will be in net.

It seems that everybody is doing it different way.

I got that formula when I was in College. They called them magic numbers. I also know the way you have showen. However, I find these easier to remember. 😀

 

[kirkgas]

Metric 2nd reading minus 1 st reading x 321. Imperial 1098 divided by time taken to do on revolution. divide by 1.11 to get net.

that gives HI not gas rate

 

[royston]

I use a corgi slide calculator. Not an app so no need to worry about battery's running out ! lol. Regarding calculation, i remember on my inspection i had pencil , paper, calculator. On starting to go through the calculation, he saw my slide rule in my paperwork and said why arent you using that instead. I replied i thought you would want to see me write the calc down. Always used this bit of cardboard technology since !