gas pipe sizing

[Inverness]

revising for my gas, trying to understand pipe sizing.

I've got the spec college book and I'm trying to get my head round the gas pipe sizing from the books from class. we don't start it until march but I'm wanting to get a head start as theres lot to study and I'm a slow learner.

I'm struggling with understanding the maximum pressure loss from the meter at any point of use is 1mb. can someone explain this in a easier way if they can.

also from the diagram i have with meter A to the first tee B is pipe length 3 meters long and states it has two elbows? overall equivalent length is 4meters. as the elbows at as 0.5 x 2.

i can't work out where the 2 elbows are? cause from B - C is a fire.

i hope this isn't too much for some ones advice.

 

[Orlando5007]

Re: revising for my gas, trying to understand pipe sizing.

Maximum pressure loss from meter to each appliance is 1mbar

Lets say house Has a boiler
The maximum pressure loss from the meter to the boiler can only be 1mbar (the pressure is lost when the pipe is too small or theres too many bends)

 

[Orlando5007]

Re: revising for my gas, trying to understand pipe sizing.

Have you got a picture of the diagram?

 

[Inverness]

Re: revising for my gas, trying to understand pipe sizing.

a---------------b------------------d
|
|
|
c

 

[Inverness]

Re: revising for my gas, trying to understand pipe sizing.

if you can imagine below the b is the pipe work for c

 

[Orlando5007]

Re: revising for my gas, trying to understand pipe sizing.

Just send a picture

 

[Inverness]

Re: revising for my gas, trying to understand pipe sizing.

View attachment gas sizing example.pdf

 

[Inverness]

Re: revising for my gas, trying to understand pipe sizing.

 

[Inverness]

Re: revising for my gas, trying to understand pipe sizing.

a-b i don't understand why it says there is 2 elbows? i lost.

 

[Orlando5007]

Re: revising for my gas, trying to understand pipe sizing.

It basically wants you to imagine that between point b and c theres bends

 

[Inverness]

Re: revising for my gas, trying to understand pipe sizing.

what about the 1mb maximum drop from the meter?

 

[Orlando5007]

Re: revising for my gas, trying to understand pipe sizing.

Let me get home ill work it out for u tonight

 

[Inverness]

Re: revising for my gas, trying to understand pipe sizing.

thank you.

 

[Inverness]

Re: revising for my gas, trying to understand pipe sizing.

can you explain about the pressure loss. i can find out the amount of gas required from the table but where it becomes a struggle to understand is when it talks about the maximum pressure loss at 1mb

 

[Dotty]

Re: revising for my gas, trying to understand pipe sizing.

I've moved this to the arms because we don't discuss gas in open forum but at the same time we want to encourage and help you with your learning.

What the exercise is trying to do is get you to size each section of pipework so no section has a drop greater than 1mbar. I aim for 0.5 max but that's me.

The exercise shows you leg a-b, b-c and b-d with the appliance load on each leg. Because the diagram would be complicated by showing each bend and tee you're just told how many there are.

So, work out your size using m3/hr for leg b-c. Same again for b-d. Add your two loads together in m3/hr and work out your pipe size for a-b.

And then Bob's your aunt's live in lover.

 

[Inverness]

[MENTION][MENTION][MENTION]

[PHP][ATTACH]26787.vB[/ATTACH]

[/PHP][/MENTION][/MENTION][/MENTION]can someone find the answers for my pipe sizing

 

[Inverness]

View attachment 26788

 

[Inverness]

 

[Inverness]

 

[Inverness]

the table below is where I've got my answers from.

 

[ShaunCorbs]

what do you get ?

 

[Inverness]

 

[Inverness]

 

[Inverness]

its a rough table.

 

[Inverness]

hi shaun I've posted my answers. its quite rough.
thanks for your time.