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Disclaimer:

This video is for qualified and competent commercial gas safe registered engineers only.

Do not take it as advice, do your own due diligence before carrying out any work.

Please ensure that you are gas safe registered and follow the current regulations.

Carry out your safety checks. Your Flues, Air, Gas, Safety device checks/ 26.9 checks.

Do an overall risk assessment and wear PPE when necessary.

Safe Isolation Procedure & electric safety:
Identify the source(s) of supply. Test your digital multimeter / approved voltage indicator & volt stick to make sure that it is working properly. Isolate the supply, disconnecting the system from the mains. Place the voltage free wires into a terminal block/wago. Secure or “lock off” the isolation using your safety padlock, preventing any tampering. Put do not use signs up on the switch you have isolated/locked off. It is good practice to wear gloves, rubber sole boots, have an electrical safety mat underneath you whilst working on high voltage and use VDE tools. Ensure that you are qualified & / or competent to work on high voltage.

Refer to your manufacturer instructions.

These videos have been made in good faith to encourage working standards, mindsets and knowledge in the industry.
This video is no substitute for proper training!

For a volume calculation/service sheet as seen in the video kindly send me an email and I'll send one to you.


1.Purge volume of pipework = IVp + IVf x 1.5 = PVp

Calculations:
IVp (0.758) + IVf (0.0758) = 0.8338 x 1.5 = 1.2507


2. Meter Cyclic Volume = U65 meter 0.100 (see chart)


3. Purge Volume of Meter = Meter Cyclic Volume x 5 = PVm

Calculations:
0.100 x 5 = 0.5


4. Purge Volume of Equipment PVe =
For example purge hose is 20m of 25mm. 20 x 0.00064 x 1.5 = 0.0192


5. Total Purge Volume = PVp + PVm + PVe = PVt

Calculations:
(PVp) 1.2507+ (PVe) 0.0192 + (PVm) 0.5 = 1.7699

6. Minimum purge flow rate =
(see chart in book for largest pipe size in install)

125mm = 30.0m3/h


7. Maximum purge time = PVt x 3600 ÷ Flow rate

Calculations:
(PVt) 1.7699 x 3600 ÷ (flow rate) 30 = 212.3


Purge volume= 1.7699
Flow rate= 30.0m3/h
Seconds= 212.3



5 ways of getting to 10% for fittings

10% added
0.758 x 1.1=0.8338
0.758 +10%=0.8338

Calculate 10% of the value
0.758 x 0.1 =0.0758
0.758 x10% =0.0758
Or add a 0 after the decimal place.