One of the best teachers explaining how to learn to size instillation . I have raised a complaint in LCL as they don’t supply sheets (form to fill all the details) it’s confusing and I noticed many trainees don’t understand at all. If sheet was there it would have opened they eyes faster:))). Thank you Derek I will share your videos with my group.

Very helpful, I’ve been in the industry for over 35 years, and this is the best paced explanation of Gas pipe sizing I’ve heard so far. Top job.

Derek sir you are an absolute gent. I was recently trying to remember how to estimate pipe sizing and always struggled with the bit about adding the pipe sections... From this tutorial it suddenly makes sense... 20 years after passing my first ACS...🤪 Thank you once again ..

Great video Derek, really well explained and easy to follow when doing pipe sizing, getting the correct pipe sizes is really important as it makes a big difference with the pressure drop. Doing this in class at tomkat it does pull your hair out but once you get your head down to it and get to understand the process it makes it enjoyable in sizing the pipes for the appliances. Excellent video Derek..👍👍😁😀

Pipe sizing made easy by Derek Brilliant video 👍👍

Well planned and delivered. The clarity is amazing. Tank you for this video on piping calculations. Thanks.

Brilliant explanation, I watched this one while doing a bit of revision and it helped massively. Top bloke :)

The Books are clearly only a guide Derek fills in the__Gaps__ & helps you to understand everything clearly & easily what a massive help these videos are to us Trainees 👍🏻

Great video sir, love all your tutorials, you are helping so much , thank you !

Thanks Mr D for this well illustrated video.

Long winded yes, but very useful. Of course you gave the worst case scenario but it included most typical examples. Very clear and great help, thanks.

mastered pipe sizing yet again, thanks.

Great video Derek thanks again for your training videos

This video is awesome! Really informative. Really helpful. Every step explained clearly. There is no chance I can go wrong if I carefully follow the steps you have outlined. (I should have watched this before attempting the homework 🤣) Thanks Derek. Top video. 👍🏻 Asian Jon. Training.

Cleared a few doubts I was having thanks

Perfect Derek. Great explanation. Thank you very much 😀👍

Great video as alway. Have my ACS in 3 weeks and this was a great refresher.

Thanks again Derek, another great informative video.

Proper handy video, understand it perfectly now👍🏻

Excellent vid. Your vids help me out daily.

As with all your other videos- very comprehensive. nice one thank you.

Good stuff Derek, making pipe sizing look easy as pie :)

A lot easier to follow many thanks derek

This video really helped with my revision. Legend. Mo😁

Absolutely amazing explanation! Thanks so much

You are the best Derek

Great Tom , it was very helpful for me training 👍. Well done 👏

Jon-Paul Ward. Thanks for another informative video Derek. Very easy to follow and understand.👍

Thanks Derek very well explained

Many thanks for the video very easy video to follow for a trainee like me

Absolutely brilliant mate. Thanks alot

Absolutely great video love it. Well done 👍

Brilliant video Derek 😊

Excellent tutorial many thanks Derek, HAPPY CHRISTMAS & NEW YEAR.

Wow very well explained very helpful thank you very much

Top lesson derek nice one

Thank you a lot Derek 😊

Thanks Derek great video

Thank u so much am grateful for ur time and effort beautifully explained

Great Video! Doing my gas right now and this video is Great! 👍

Great video Derek.....Thanks fella.

Many thanks mr Darek u helps me a lot

Amazing thats so easy to understand

Top vid again Derek. You make this look easy thow lol 😁 Can't wait to get back to training 👍

Another great video thanks, only thing I would mention is g4 u6 meters are unlikely to pass 70kw of gas , but great tutorial 👍

Great Video Derek. Very well explained all the requirements and calculations. Bilal M (billy) Tomkat trainee

Very good information thank you

Thanks for the video. Thank you.

Thank you, Very helpful

Thank you its very helpful video

this helped so much

Great video cheers Derrick. Jordan

Needed that 😊

Well done 👍

Class videos these 👍

very helpful

Thanks for the video Can you talk about the burner pressure (method statement )

fantastic

this Man is a god damn genius. I had almost given up the will to live until I saw this!!! Next gas course I will find a hotel to stop in Ashton under lyne

Great clip, could you also do a clip on flueing/chimney standards, would be very useful thanks again

Thank you

Excellent video Derek, Exactly what I did in my acs earlier this year an yes mind bending at first but once you have the hang of it it’s simple.. I agree some engineers say it’s take to much time up an wont do it.. basically they can’t do it But can you please confirm the 1mb from meter to appliance is per appliance or over all appliances running together .. as you drawings an appliances an pressure loss over4 appliances running together would be well over a 4mb drop. Saying that everything would have to be bigger pipe sized.. I’m only asking as I was told/taught that it’s over all appliances Thanks an great video 👍

Hi Derek, super helpful. THANK YOU!! Have you created a test one?!

Derek is it correct to include the tee at B in the first calculation Is the tee at B to be considered when doing B-D

Great Vid Derek thanks, I have a question. I was fitting a bathroom at a large building that's being converted to flats. I had to get some stuff from the outside store. I noticed all the gas meters are u6 with 22mm outlets going to 28mm track pipe then to what looks like 2.5" yellow in a floor chamber, then travels under block paving about 60 m into the building reducing to 28mm trac pipe to feed Combi boilers in each flat. My question would be & I raised this with the project manager. A) Is it normal to reduce up. B) Will the length of run have a load factor on the meter size. TIA

Hi Derek one question. Last section from A to H .should we include F to G in pressure loss

Hi Derek, I love your video’s and like many viewers I have found them so very interesting and useful to understand about all aspects of gas safety. This is where I am a little nervous, because I am going to question the way you are interpreting the equivalent length when it comes to the Tee fittings, specifically between the meter and the Boiler. The way I am reading it, is you only need account for a Tee Fitting, when the flow is either ‘entering’ or ‘exiting’ a Tee, not when the gas flow is going straight through it. In your diagram, where the Tee is located at point B, the Gas Flow is not entering or exiting a Tee branch, its going straight through it, so does that not suggest that when accounting for gas flowing to the boiler, the Tee connector at B should not be accounted for? Of course you would account for the Tee fitting at point B, when working out the Pipe size from B to D, because in that case the gas is exiting the branch, but if the gas is not flowing in or out of a Tee branch, isn’t that like having a straight piece of pipe from the Meter to the boiler with six 90 degree elbows (1 elbow from A to B and 5 elbows from B to C). If you could please clarify this point I would be much obliged. Regards Steve

my brain burst already Derek

I have a situation, my new firepit requires 240k and it is 60’ away from meter. The current pipe line is as follows-from gas meter 1” pipe size for 50’ distance and then branch out for 1/2” size for next 10’ distance to fire pit.Does this current pipe system would be good enough for 240k btu firepit?

do you sell the paperwork blank sheets you use in this tutorial. or where can it be bought. great videos .thx

Thanks

Can we use the same design methodology (including 1mbar pressure drop) for commercial gas kitchens and communal heating systems with multiple boilers?

If you use sweeping bends to that appliance c 22mm pipe would be plenty.

Thank you Sir. Brilliant stuff as always. just wondering, does reducers affect on pressure drop like other fittings or not? Thank you.

great example any chance you can guide me to where i can get the chart print offs lm just starting off to becoming a assessor and need all the help i can get ps love the videos and the way you explain everything so clearly

Hi Derek, can I double check the flow rate calculations with you. So a 30kw net boiler would have a flow rate of 3.094 m³ (30×1.11÷10.76). Where does a multiplication factor of 0.095 come from?

great video but how do you equate reducing fittings i,e tees and sockets into different pipe sizes or are the fittings chart the same flow rate no matter the tee ? eg. A-B is in 35mm teeing into B-C in 22mm and then B-D in 28mm. again great video learnt a lot

Hi, if we change a 15.5 kw integrated boiler (with hot Water tank inside it) in the airing cupboard, on the first floor, with 22mm copper pipe, from the meter, a branch to the gas hob, on the ground floor, with approximately 8 metres, for a 30 kw combi boiler in the loft, could I use the 22mm pipe, or extend with 35 mm pipe into the loft? Thanks.

Could you please upload a video on notching joists.

Excellent right in at the deep end with this. If you can do pipework sizing this big then the ACS exam should be easy.

10:09 you go for 28mm, is there any specific reason why for that? beside experience. Such as ''if total kw of the appliances more than 40kw'' or ''the total lenght of the pipeline is more than 20 meters'' etc?

Very good video. Where can I get a copy of the gas flow chart please? Have the viper book and second addition book and i cannot find it ??

Good evening, a comment. IGEM/UP/2 edition 3 guidance document states that gas pipework system should be designed from the gas meter to the appliance with a max drip drop of 1mbar. It later states that the appliance must also be safety set to work in accordance with the manufacturers minimum working pressure which does not mean that you must achieve the max 1mbar pressure drop it can infact be much higher.

can i just ask where the conversion figure 0.095 comes from and can this be used in any part of the uk or is this based on a certain calorific value? also when pipe sizing is this done in NET or GROSS?

I have a query, the branch of the tee at B supplies all appliances except the boiler but you appear to have used the branch exit as the boiler supply not the other appliances. Is my observation correct or am I missing something (hopefully not all my marbles)?

Make sure to check for installation volume after to! Sorry but the pipework you gave in metres and sizes. Are they within the 0.035 m3 (maximum installation volume) as per IGEM/UP/1B). Thank you

Hi Derek I have a question? - if the max flow rate in M3/h is 6.65m3/h - and it's a G4 meter - would that not exceed the max flow rate of 6m3/h or would allowance for all the appliances not being on at the same time be a factor? Thanks!

Hi TomKat Gas Training, I was wondering why a T fitting has been used for the A-B section, when the book says that 'no tee allowance is required for pipes running straight through'. Shouldn’t the Tee section be used for the branch section, B-D? Thank you.

Hi mate, great video. Was just wondering if a bigger meter would be required for this example e.g a U16, as 6.65 M3/hour is about the 6m3 flow rate of a g4? I'm currently doing a CCN1 course and we studied pipe sizing for the first time this week. Cheers

I should know this but becuase of brain fade tell me do these calcs assume that all appliances could be on full rate at the same time?

Hi Derek, first of all thanks for the video's. I have a question. So when calculating the gas rate of appliances eg (30Kw Boiler x 0.095 = 2.85) but when going through my book it was using Diversity Factor. So for example (30Kw Boiler x 1 DF = 30Kw) then using the calculation (30Kw x 3.6 = 108MJ) then (108MJ ÷ 38.76 = 2.78). So basically I'm wondering is it fine when working it out just to use the quicker and simpler method of x 0.095?

Hi Bro please make a video obout, where I get questions 35mm pipe 18 meter length and what is pressure flow rate

Hi Derek That’s a great video. Any chance you can share your template pleas?

Hiya, if a result is 0.517 or 0.016 for example what is the best size pipe? When looking at mock questions on pipe sizing it asks a pipe size for said length and given gas rate but the awnser could be one or the other 28mm or 35mm for example. Would you select the 35mm to allow for future adaptations to the system or select the 28mm cause it’s cheaper for the customer and is correct for the current installation?

If you bend the pipe and don't use a 90 fitting.. how does that affect the calculation? Help pls Derek.

Hi Derek..great video as normal but where can I download the paper charts from please..keep up the good work

Great video as usual sir. One question as a new learner in this industry, what formula do you use (regarding bs6891 ) to convert maximum heat input Kw net to maximum gas rate m3/h ? Thanks

Hi, a to b only has an elbow, the exiting t will be on b to d

I am a plumber and I started my gas course last year. I have a random question,, so the question is , would it be possible to find all that calculations without the charts and use a formula instead or do we always have to refer to the chart. Many Thanks

Hi Derek planing to open a cafe and don’t have a gas in the building and called the gas supplier and before they install it they want to know annual load kWh and peak instantaneous demand kWh as well. How do I calculate I asked some British gas guys while they are on the job and they don’t have no clue 😊 can you able to help what would be the similar cafe or restaurant if you can guide many thanks