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http://www.spiraxsarco.com/resources/steam-engineering-tutorials/the-boiler-house/boiler-efficiency-and-combustion.asp Have a look at the gas table on this website. It give caalorific values at NTP. Can anyone explain what NTP is for each gas propane ,butane and NG. is it 28,37,20 mBar or is...

There is a rotary nut type fitting on the hob piping but there is nothing for this to screw onto. Should there be an elbow type fitting with a female thread and washer in the box. I want to connect onto 10mm copper. Please advise . Thanks Mike

There is a rotary nut type of connection on most hobs. Is it ok to loosen this and realign to suit direction of pipe feed. If so would you need to put some gas seal paste on it to get a proper seal. I am qualified but just starting out. Thanks Mike

What range of fittings do i need to bring to install a hob. Will probably be using 10mm copper tube. I have heard there are different types connectiuon points to hobs. Please advise on whether fittings are male or female also. Thanks Michael

I recently started doing gas installations and am qualified. I have a bayonet hose, bayonet socket and a straight wall connector. The problem is the straight wall connector needs the copper pipe(15mm or 1/2") to be soldered into it. The wall connector has a 1/2 female iron socket on the other...