boiler test

[R.G.Y.]

The subject of brass v copper is out of hand, I suggest they read Model Boilers & Boilermaking  by K.N.Harris.
 My problem. I have designed a small boiler, which I presented to the club (Southern Federation affiliated) tester. Yes the calculation seam O.K. but he would not test it if I built it as it was not an approved design. I also have 2 published plans 1 by E. T. Westbury & 1 by W.Melville as on working pressure is stated on either they are not approved ether

[kno3]

Which are the "approved designs" and who makes that decision? And which country, by the way.

[R.G.Y.]

It seams it is up to the tester, if they don't feel qualified. Off course this is the U.K. where all rules apply. All I want is a certificate for insurance. Approved designs are published designs? but they must have a working pressure stated, or they must be recalculated. My design was for below 1.5 bar-liter now the Nov 2008 edition states only boilers over 3.0 bar-liter need regular test, below this rules do not apply. How ever an initial test is required by the club insurance, so I can opperate in a public area.

[kno3]

Thanks!