Tightness Test - Low Pressure Gas Installation - Gas Training - Russell Holdsworth
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- Опубліковано 2 жов 2024
- #GasTraining Tightness testing. Viva Training Academy. And we're going to show you a tightness test. I've got an expert trainer today, Russ, the expert trainer, and he's going to show us how to do a tightness test on a U6 and a G4 gas meter, a low pressure system. So yeah, let's go and have a look.
GAS TRAINING. HOW TO DO A TIGHTNESS TEST.
Thank you, Allen, for that. My name's Russ from Viva Training Academy This morning we're hoping to take you through, well we're definitely going to take you through, tightness testing, the basics at least, and we'll build up from there. My experience is 40 plus years in gas industry, and the last 22 or 3 in training, specifically, mainly domestic, but also commercial.
Tightness Test - Low Pressure Gas Installation - Gas Training
Why do we tightness test? Obvious reasons really, to make sure we weren't leaking any gas, but also for other reasons, we're looking at pressures. We're looking at the installation in general, and we're also inspecting, has it been installed correctly before we even do a tightness test?
What we have here is a typical metre installation. Although there are a number of faults on it, and this is something you need to be looking for before you start even doing your tightness test. There is obvious things to a gas engineer that will become second nature to you as you go along. The main tap itself, is it secured correctly? Simple things. Does it fall to the off? What we mean by that is, should it be not, it would close not open by accident. There should be a label here saying which direction to move that lever in. All faults that should be rectified as you go along. Metre regulator, is it sealed? The metre itself, is it secure?
And when we move outwards from there onto the main pipework, there should be what we call, earth bonding. In other words, a connection to the main electrical circuit, should there be any stray current which would trip the safety devices. It should be visible. It may not be visible, but it should be visible for the gas engineer to be able to know it's there. If it's not, we'll come to it later. It's just paperwork exercise, what we need to cover here. It should ideally be before the first branch or first T on the pipe work. If there's only one pipe within the first 600 millimetres of the metre outlet.
Right, installing the U tube gauge, always difficult to find somewhere to secure it in this particular case, we're taking the pipe round the back but for ease of. You find somewhere to stand it up, hang it up, they do come with a stand quite often. There's various ways you can fasten that up. The screw on the metre, the test point on the metre. It shouldn't be tight, if it is tight, don't bring it so tight afterwards. They are only a small screen and they do snap off quite easily. The U tube gauge, we've always already checked to make sure the integrity of the gauge is good. You won't be the first engineer to spend a while looking for a leak that's on your old equipment. Always check your own equipment first. Putting the gauge onto the metre. And that's the basics. Already zero-ed the metre and the gauge, as I say, and that's ready to test.
So what we're going to do first is a let-by test.
Why do we do a let-by test? We're trying to prove the integrity of this valve. Why do we need to prove the integrity? We want to know, is the valve sound in itself? Is it passing any gas through it? If that valve is passing gas, it could mask a small leak on the system. If it's leaking as much as it's passing, you'd never know we had a gas leak. So we need to prove, first of all, is that valve gas tight. To do that, we pressurise the system to a smaller pressure, which allows us to be able to see any rising pressure if that valve is passing. In this particular case, we're going to raise it to approximately 10 millibars, the book says 10, 10.5, in fact the book says 7 to 10, but around that pressure will prove the point.
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Huge respect for allen. A true gentleman. Always there to help.
Thank You.
I had a gas engineer come round and check my system,
he did a let by test, a tightness test and a burn rate check......... all passed ok, no let by, no leaks and the burn rate was perfect.
however when I turn the gas off before it gets to the meter, my meter is still ticking up by a small amount!
Also I've received a bill from my energy supplier for £7000 worth of gas, for dates between November and July.
This is for a 2 up, 2 down, with gas only used for heating and hot water. I mostly use 2 wood burners for heating so I barely have the heating on.
The gas engineer said it wasn't possible to use that much gas as the boiler would have melted into the ground! He said there is no gas leak and if there was, for that amount of gas, the whole street would be able to smell it.
Any ideas?
If you take off the ECV and let by is confirmed. How do you fix it?
Call 0800 111 999 and Transco will come out and sort it.
He sounds like peter Kay , When peter is doing max and paddy 😂😂😂😂
Would you like us to do any other videos? Thanks.
thanks russel, great insight. proper teacher who broke it down and made the learning simple. thanks russel
Glad it was helpful!
I thought you had ldf the flexi and connections to the inlet side of the regulator incase it had locked up.thats what i was taught
I have always thought testing for let by first and then the test for soundness which requires two movements of the consumer control cock could show a tight CCC the first time but could in theory pass when you are testing for soundness . By checking for let by after a successful soundness test ie reducing the pressure in the system to 7/ 10 mbar would enable the let by to be achieved with only one movement of the CCC. I never would leave a 4m bar drop ,always thought this was very generous depending on the volume of the installation of course and cirtainly not 8 m bars for the newer meters.The internal volume of gas may be less for the meter but stays the same for the installation which could contain long pipe runs of pipework.LastlyI used to find meter test nipples could have hair line cracks in them where they had been tightened to excess.but turning the screw back a touch would close the crack up and it would not show . Easily missed.
Thanks for the comment.
second gas meter the one with no handle attached also missing handle open close direction label !!!! @14.25mins into video
Good video but I would like to address some differences in procedures from the gas utility I worked for. My experience comes from 35 years as a first responder / gas fitter for the gas utility in St Louis, Missouri. Your pressure test procedure with the water tube manometer is pretty close to ours except for the measurements here in the states would be in inches of water column. Differences would be #1 we would not put a service regulator back in use without knowing it's lock up and working pressures #2 Flex line connections are prohibited on the inside and outside meter sets ( we did use them at times years ago but found them to be problematic as they aged). All meter sets here are hard piped into place. #3 apparently you use the Pietro Fiorentini regulators with a vent limiter & we still use IMRV type Regulators that still need to be vented to the atmosphere.outside.#4 is your copper fuel runs in this video soft-soldered (?) or am I mistaken & that is a high temperature brazing alloy? Thanks for the video and please stay safe out there.
Why do we do the TT at 20-21mb? What is the main reason at this pressure? Thanks
Thanks Allen & Viva - great videos and facebook group. I’m a new trainee and these are so helpful!! Keep up the good work 👍🏻
Awesome! Thank you!
Really helpful video, can you cover safety devices in boiler and cookers and how to check them correctly.
Would you like us to do any other videos? Thanks.
Thank you so much for your kindness for sharing your knowledge.
My pleasure!
Good video thank you Allen appreciate it. 😀
Great work Russ .this vedio is very informative.
Thanks Alan I am always watching your videos very informative, help me lot , pls video on unvented system.
ua-cam.com/video/2ZQH-TgD7ao/v-deo.html
Before you do a gas test lift the cooker hood if there is one 👌
I have a numbers of coments as I was a trainee of Viva centre in Halifax but I will give my coments next week.Mr Ross and Mr Richard known me very well.
Look forward to your feedback. Thanks
This is excellent. Thanks for making these videos Allen you are helping alot of people myself included i'm going to be doing my ACS soon.
Would you like us to do any other videos? Thanks.
@@AllenHart999 Hi Allen.
I've got my ACS exam soon and your video information support help me so much!
Can you do video for local tightness test when we check safety rectification device. Appreciate it! Thanks!
topman allen, thanks as always
V Good.
How about a vid on what the regulator is for? On the old town gas there was none, as each appliance had its own regulator (called a governor).
Also emphasizing massive difference in pressure from 22 mb (gas) 2 bar (common on a mains water supply).
What pressure regulator should be set to, to know when to report it if out of range?
mention pressure in the gas mains pipe to after the regulator. This varies of course.
Maybe outside of topic, but high and medium pressures gas mains.
All meters have an overload, mention that.
I could go on. ;)
Not sure about that. See what we can do. Thanks so much.
Another great video Allen.
do they not teach to attach a temporary continuity bond across meter prior to touching anymore ?
Never have. You would only do that when removing a meter. Thanks.
After safe isolation checks. The 1st temporary bond clamp is placed upstream of the meter. Where the existing earth clamp would be. The 2nd would be place downstream of the the meter but NOT on the Anaconda ccst pipe itself . Then you would proceed removing the meter.
Great video
Thank you
You should take this video down. You teaching the tricks of the trade to everyone. Haven’t you got nothing else to teach.
Thank You for the feedback. There are loads of videos on this subject already. Thanks.
@@AllenHart999 sorry mate. I’ve just seen there other videos. Doesn’t make it right though. People are going to watch this and attemp to install their own gas boiler. 100%.
you can't beat experts, experience, and knowledge educating us, rather than some other videos, where they do not know what they are talking about, which can be dangerous for every one.
plus thanks for not having a load of unnecessary " noise " going on in the background, which a lot videos have, for some unknown reason.only to distract us.
thanks very much.
I'm on nvq blue card lvl 2 , thinking of going for that gas license , also my cscs expires in about 6 months , im 24 now 😯
Would you like us to do any other videos? Thanks.
Allen Hart anything will help , i'm still a long way until i get on it . Thank you too 💯
Can you do a vid on how you tightness test lpg systems please?
I will see what we can do. Thanks.
What about old installation appliances connected and there is let by .but isolate the appliances and the let by ok therefore us it id because the leak is on the pipe work .
Hi Alan, I watch your postings every night and they are absolutely brilliant, so easily explained and easy to understand. I have been considering a career change for the last few years and gas engineering always comes out on top! I am in my later years in of my working career at 48 and my only option would be the fast track option. The trouble I have is finding a gas engineer that would help with completing the portfolio, my labour of course would be free. So if you have any suggestions to help me I would be extremely grateful. Best regards Mick
Big up to Russ.. brilliant teacher..
You know this by now. 😂
Thanks guys very informative 👍
Would you like us to do any other videos? Thanks.
What's the reason we do a let by test at 7-10 mbar? I can't remember!!
Very good information 👍🏼👍🏼👍🏼
Would you like us to do any other videos? Thanks.
Great video Allen, a big thank you to yourself and Viva training, and the Facebook group is fantastic.🌟👊
Would you like us to do any other videos? Thanks.
Hi Allen, yes please, the video's yourself and Viva training are superb. Maybe the next one could be on gas pipe sizing? Hopefully you and Viva training will make series of course video's?😁🤞
@@davidoshea1536 Hopefully we will do loads of these videos. Thanks.
👍👍👍From me Al. We never stop learning young or old 😜😜😜
Would you like us to do any other videos? Thanks.
@@AllenHart999 yes please Al. Many thanks
Brilliant thanks for this Russ, keep them coming please
Would you like us to do any other videos? Thanks.
How to use gas analyser and interpret the information, same for multi meter specially for what gas engineers would use it for, also, more on wiring up boilers/ S plans etc thanks 😊
🙏 thank you. So useful
Glad it was helpful!
great video
Thank You.
great.....
Thanks.
LDF on the anaconda and ECV at the end of test ?
Thanks very much for your comment, please consider subscribing to support the channel 🙂
@@AllenHart999 already subscribed Allen love the videos I'm in commercial catering but still enjoy the core and domestic content 👍
@@marcb5328 Please send me some videos if you get chance, Would really love to see them. Thanks. WhatsApp 07725 692699
Brings back memories of the old days back in blighty, completely different regulations down under.. Keep up the good work Alan👏🏼👏🏼
Where are you? Thanks.
@@AllenHart999 Living in Western Australia for the last 13 years. And loving it.
@@craigbeardsworth1305 Did you live in the UK
@@craigbeardsworth1305 how old was you when you migrated lol
Allen Hart Yes, just over the Pennines Lancashire..
Nice video, well explained!
Thank You so much. Would you like us to cover anything else?
Gas pipe sizing
@@jgregory935 Sounds like a plan. Thanks.
Great video thanks What are the parameters for pressure drop test on a domestic propane system using a pair of 19kg bottles? The regulator is set to deliver 37 mbar.
Thank you any info much appreciated
Richard
If there is a let by, get In touch with the supplier to replace the emergency control valve.
Or have it greased.
@@johnburns4017 only the gas supplier can touch the ECV........Officially
@@philippayne6655
I never wrote otherwise. ;)
Thanks for the comment.