Gas related question - is that still ok ?

[Old Account]

give us the full facts then cant work it out half arsed

do a drawing of the gas line elbows ts appliance etc

distances from meter to to the cooker t cooker t to boiler you get the drift

will work it out for you but need everything

 

[ShaunCorbs]

View attachment 29972

now your learning give us 5 mins

 

[Old Account]

flue gas analyser, did he do one?

Unfortunately I do not know the readings but if I asked my customer I could get a picture of the gas certificate.

 

[ShaunCorbs]

right since cooker and boiler are so close dont need to worrie about cooker just add it in with boiler

boiler 27kw + cooker 8 kw = 35 kw

aprrox 0.3m for a pulled bend and 0.5m for an elbow

so 6 pulled bends and 4 eblows

13.5m + 1.8 (pulled bends) 2m (elbows) so total = 17.3m

so you need 35 kw at 17.3m from the meter

its on the max drop of 22mm so i would recommend 28mm giving a drop of 0.40 mabr

(to work it out into m3/h)

kw / 10.65 = m3/h (35/10.65 = 3.28 so 3.30m3/h

so look at your table of m3/h that copper can carry and you will see 22mm will just but its maxing it out

 

[ShaunCorbs]

View attachment 29972

hows the copper going from the meter to the appliance in the floor? if so wooden ? etc

 

[Old Account]

now your learning give us 5 mins

hows the copper going from the meter to the appliance in the floor? if so wooden ? etc

The copper runs in the floor under floorboards.

I have got exactly similar counting as you.

Pulled bend of 22mm copper -> 0.30, elbow 0,60, 1x22mm T 1,80 which is reduced to 15mm copper pipe to the hob.

I've got a loss of 1,23mbar roughly.

So, I am right in upgrading the pipework to 28mm which will give me around 0,39 mbar drop.


Thanks for your massive help.

Much appreciate it. I wasn't that wrong with my calculation.

 

[ShaunCorbs]

The copper runs in the floor under floorboards.

I have got exactly similar counting as you.

Pulled bend of 22mm copper -> 0.30, elbow 0,60, 1x22mm T 1,80 which is reduced to 15mm copper pipe to the hob.

I've got a loss of 1,23mbar roughly.

So, I am right in upgrading the pipework to 28mm which will give me around 0,39 mbar drop.


Thanks for your massive help.

Much appreciate it. I wasn't that wrong with my calculation.

the question is what would you do

 

[Old Account]

the question is what would you do

I will speak to him tomorrow and will tell we will need to upgrade the pipework. I cannot do much more than that. But I also will proof him with my calculations that's running on maximum. What would you recommend ?

 

[ShaunCorbs]

I will speak to him tomorrow and will tell we will need to upgrade the pipework. I cannot do much more than that. But I also will proof him with my calculations that's running on maximum. What would you recommend ?

i would say you've worked the calcs out and what does he think (show him your workings)

two outcomes

1 he agrees with your calcs
2 he says it will be fine, after that he gets sacked / kicked off the job

 

[Old Account]

i would say you've worked the calcs out and what does he think (show him your workings)

two outcomes

1 he agrees with your calcs
2 he says it will be fine, after that he gets sacked / kicked off the job

Where did you get the 10.65 from?

 

[ShaunCorbs]

Where did you get the 10.65 from?

thats what you divide the kw by to get the m3/h some use something else but i cant remember something like 0.0095

 

[stani]

am just cautious as I am clearly running a business which means i cannot allow myself to have complaints from my customers.

You need to forget all about working pipes sizes out and be worried about the 2 unsafe situations you have left. I would be ringing another GSR right now to go and test the 2 boilers that your company have left untested.
Then I would find another GSR who does know what he's what he's doing before you take any more gas related work on.

 

[Old Account]

thats what you divide the kw by to get the m3/h some use something else but i cant remember something like 0.0095

Yes that's what I used for my calculations 0.0995

 

[ShaunCorbs]

Yes that's what I used for my calculations 0.0995

0.00995 thats the cookie

 

[Old Account]

am just cautious as I am clearly running a business which means i cannot allow myself to have complaints from my customers.

You need to forget all about working pipes sizes out and be worried about the 2 unsafe situations you have left. I would be ringing another GSR right now to go and test the 2 boilers that your company have left untested.
Then I would find another GSR who does know what he's what he's doing before you take any more gas related work on.

I definitely will sort that out now! Thanks for the advice.

 

[Old Account]

0.00995 thats the cookie

1 kw input requires 0.095 cubic meter / hr of gas

 

[ShaunCorbs]

1 kw input requires 0.095 cubic meter / hr of gas

think you missed an 09 off?

 

[Old Account]

think you missed an 09 off?

That's what's written in my logic book

 

[ShaunCorbs]

That's what's written in my logic book

work it out then i come up with 351 m3/h on a 35 kw boiler for 0.095 😀

for 0.00995 i get 3.51 m3/h which is about right

 

[Old Account]

work it out then i come up with 351 m3/h on a 35 kw boiler for 0.095 😀

for 0.00995 i get 3.51 m3/h which is about right

I don't want to discuss you may be right but that's what I have got in my logic book