Gas volume

[adam84]

The 70kw size limit is a very misleading way of defining the scope of domestic/commercial work because boilers in the UK are manufactured to two seperate standards, BS6798 refers to domestic boilers and BS6644 refers to commercial boilers. This means that an engineer holding CCN1 and CEN1 could not install a 30kw boiler made to BS6644 but could install a 70kw boiler to BS6798, so to install the 30kw boiler he would need to acquire COCN1, ICPN1, TPCP1A and ICAE1/CIGA1, these cover commercial core safety, installation and first fix of commercial pipework, testing and purging of low pressure commercial pipe work not exceeding 1m2 and 21mbar operating pressure and first fix/ install commercial indirect fired appliances respectively.

 

[mike_s]

not doubting you but are you sure you need the commercial pipework and testing quals just because the boiler is commercial but what if the pipework and meter is not?

Exactly why I am doing just my codc1, comcat 1 and 3 in 2 weeks time as where I am working does not have commercial size meter or pipework and I've sought advice from gas safe on that

Regarding the commercial design boiler, sounds about right, I'll look out for that in the future. the 70kw boiler I've worked on, Buderus say they make it that so people can work on it with domestic tickets so I assume it is to bs6798 and not the commercial bs6644.

 

[bennygas]

Has anyone looked at the note in bold on p137 of EGS 5th Ed. Seems to advocate the sectioning principle mentioned.

 

[bennygas]

what's boyles law/ideal gas eqn got to do with anything? I'm guessing you're saying that the process is isothermic - but why're you testing at about 1/5th atmospheric pressure? what's this for? transpose the formulae to make either v1 or v2 the subject and the answer should drop out.