Trainee gas questions in this thread ONLY please

[bassmonster]

hey all,
I'm just ticking off the boxes in my completed tasks folder for my ACS and for some reason my mind has gone completely blank.

Ok, so in all my 12 jobs, i have to carry measure operating pressure on the appliance. correct me if i'm wrong, you cannot carry out operating pressure if the boiler has a zero governor ? is there any other way of measuring the operating pressure on a boiler with a zero governor like through some calculation with the meter?

 

[ShaunCorbs]

Hi can anyone tell me if i got this rite? I got 0.019704m3 ....cheers
View attachment 23548

show and double check your workings out its close

8m of 35mm @ 0.00084 pm
7m of 22mm @ 0.00032 pm
12m of 15mm @ 0.00014 pm

8 x 0.00084 = ?
7 x 0.00032 = ?
12 x 0.00014 = ?

total pipe work = ?

meter (u6) 0.008

total of meter and pipework = ?

+ 10% =

total instantiation = m3

 

[ShaunCorbs]

total installation = m3

sorry about that bloody auto correct

 

[acecharly]

are you including the meter in the 10%? as the tutor the other day said it was just on pipework and fittings then add the meter on

 

[ShaunCorbs]

are you including the meter in the 10%? as the tutor the other day said it was just on pipework and fittings then add the meter on

That's not how it's set out in the formula on the top of the page, and you still haven't supplied your workings out

 

[acecharly]

ive worked it out as you say and I get this, which tbf isn't goin to make much difference and is also going the rite way aslong is doesn't exceed the maximum permisable volume per hour.

8m of 35mm @ 0.00084 pm
7m of 22mm @ 0.00032 pm
12m of 15mm @ 0.00014 pm

8 x 0.00084 = 0.00672 m3
7 x 0.00032 = 0.00224 m3
12 x 0.00014 = 0.00168 m3

total pipe work = 0.1072 m3

meter (u6) 0.008 m3

total of meter and pipework = 0.01864 m3

+ 10% =0.001864 m3

total instantiation = 0.020504 m3

 

[ShaunCorbs]

ive worked it out as you say and I get this, which tbf isn't goin to make much difference and is also going the rite way aslong is doesn't exceed the maximum permisable volume per hour.

8m of 35mm @ 0.00084 pm
7m of 22mm @ 0.00032 pm
12m of 15mm @ 0.00014 pm

8 x 0.00084 = 0.00672 m3
7 x 0.00032 = 0.00224 m3
12 x 0.00014 = 0.00168 m3

total pipe work = 0.1072 m3

meter (u6) 0.008 m3

total of meter and pipework = 0.01864 m3

+ 10% =0.001864 m3

total instantiation = 0.020504 m3

Right

 

[acecharly]

cheers at least that's 1 mark then haha

 

[ShaunCorbs]

cheers at least that's 1 mark then haha

you got the viper book as yours is a bit off

 

[acecharly]

if a zero governor actually pulls the gas through could that not lead to problems with other appliances if it overpulled or even lock up the meter regulator?

 

[acecharly]

yeah I do have a viper im resitting so it is a few years out of date probably, the tightness test is a bit different to when I went through this last time il have a look in there see what it says

 

[ShaunCorbs]

if a zero governor actually pulls the gas through could that not lead to problems with other appliances if it overpulled or even lock up the meter regulator?

yes and no

if pipwork is sized correctly no as it will have the required amount of gas so wont pull from other appliances

yes if the pipework is too small / distance is too great for 15mm/22mm etc

 

[ShaunCorbs]

yeah I do have a viper im resitting so it is a few years out of date probably, the tightness test is a bit different to when I went through this last time il have a look in there see what it says

have a look at H6

 

[acecharly]

Yeah it doesnt include the meter in my book ...think that means its out of date on this?

 

[ShaunCorbs]

Yeah it doesnt include the meter in my book ...think that means its out of date on this?

View attachment 23555

no your right the formulas wrong in your first post should read

installation volume in cu meters = Vm + (Vp + Vf) = inst v

sorry about that will work it out again



same as mine but you have the fancy colour version

 

[acecharly]

one less thing to worry about cheers

 

[ShaunCorbs]

one less thing to worry about cheers

8m of 35mm @ 0.00084 pm
7m of 22mm @ 0.00032 pm
12m of 15mm @ 0.00014 pm

8 x 0.00084 = 0.00672
7 x 0.00032 = 0.00224
12 x 0.00014 = 0.00168

total pipe work volume = 0.01064 m3

+ 10% = 0.001064 m3

Pipework volume + 10% = 0.011704

meter (U6) 0.008 m3

total of meter and pipework volume = 0.019704 m3

total installation volume = 0.019704m3

 

[acecharly]

nice one that looks like what I got now....sorry to be a pain but do you have any advice on unsafe situations? I find it a nightmare distinguishing between AR ID and NCS? is there like a rule of thumb? as an example one mock question was ...You see a scorch mark on a carpet below a radiant gas fire how would you classify the situation? I put ID as at any time it could set the carpet alight but the tutor said its AR which surprised me.

 

[ShaunCorbs]

nice one that looks like what I got now....sorry to be a pain but do you have any advice on unsafe situations? I find it a nightmare distinguishing between AR ID and NCS? is there like a rule of thumb? as an example one mock question was ...You see a scorch mark on a carpet below a radiant gas fire how would you classify the situation? I put ID as at any time it could set the carpet alight but the tutor said its AR which surprised me.

the carpet is only at risk of going on fire,
your thinking of spilling thats id easy way anything to do with fluing or on old boilers case seals id

 

[acecharly]

Ive passed ...cheers for your help Shaun

 

[newcastle phill]

Well done

 

[acecharly]

Cheers Phil