Bungs and automatic vents

[GasmanxxxR1]

When you hve bunged the system and think you have closed all the AAVs you still need to release the system pressure before you go cutting into any pipe. You release system pressure by attaching a hose to drain valve and letting water out, if the system is successfully bunged the flow from the drain valve will gradually slow down and stop after about a minute, if not, air is getting in somehow and the system is draining.

Please feel free to ask any questions about bunging the system as it is something i do all the time

Sorry about the typos, just finished my first bottle of wine for the evening

 

[GrahamM]

As stoke mentioned your average well designed/installed open system should not have or need AAV's, but a few problem systems may have had them fitted to cope with the odd airlock. Just have a quick butchers round the pipework then fire away with your bungs. Sometimes the black caps have been completely removed. If I change an AAV I keep some of the old caps for times like this. Or you could just stick a bit of bluetack over the relief hole.

 

[nijjy]

morning gents. need to bung my F&E TANK. what type of bung do i buy . someone did say an expanding bung [comes with a wing nut?] is safes tto use. soemone else said a parsnip!!

 

[GasmanxxxR1]

I think monument do a kit with all different sizes mate

 

[nijjy]

thanks gasman

 

[Armo74]

Toolstation do a set of rubber bungs for £12.

 

[TerryH]

Gassmanxxr1,
Do you bung a system when you work alone? I've seen some posts that recommend having a bucket buddy on hand.
The tip about releasing the system pressure is a good one, too; makes a lot of sense, after all cutting into a pipe is a BIG commitment (-:
I've not tried it yet, I understand the theory well enough but it's that first time nerves that get me. It's like an aircraft flying, you can see it, but really it's just magic that keeps it up!
TerryH

 

[GasmanxxxR1]

Yep i work alone mate. The best thing to do first off is crack open a compression joint if poss, if you get a gusher then just tighten it up.

After you've tried doing it a few times and have confidence you will be glad about all the time saved and airlocks missed

 

[Howsie]

Plastic bag and a cable tie.

 

[jase158]

Yep i work alone mate. The best thing to do first off is crack open a compression joint if poss, if you get a gusher then just tighten it up.

After you've tried doing it a few times and have confidence you will be glad about all the time saved and airlocks missed

this is what I do, but remember on certain pipes you might have a little bit of water. if it is on a seperate drop with no drain valve for instance