Dear Kevin
150 kW is pretty high but 1 bar working pressure to atmospheric is nothing. I felt 4 bars gauge was reasonable. Compressors have to be inspected and certified every year but hardly anyone does. They commonly work to 10 bars. But with steam, that is another kettle of..well, another kettle! Maybe the best use of low pressure steam is as a heat transport medium to run a heat hot air engine. Regards Crispin Dear Crispin Boiler Inspection regulations differ significantly from area to area. Here is the Standard for Nova Scotia.: http://www.gov.ns.ca/just/regulations/regs/tsboiler.htm#TOC2_4 Anyone considering steam installations should read through it, or the one in effect in their Jurisdictional Area, to appreciate the complexities of steam systems. A pressure of 4 bars is about 60 psia, or 45 psig. In Nova Scotia, steam vessels are exempt if their energy output is less than 150 kw, and the relief valve is set at 15 psig (2 bar). See Section 4 (1) (c). There is a lot of history embedded in such regulations. Our pressure limit may have been set as a result of an accident 100 years ago, when someone was killed when a 30 psig boiler blew up. That is one reason why regulations differ significantly from area to area. Best wishes, Kevin
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