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 ----- Original Message ----- From: Crispin Pemberton-Pigott To: 'Discussion of biomass cooking stoves' Sent: Wednesday, May 15, 2013 10:07 PM Subject: Re: [Stoves] Green Steam Engine I was actually referring to the pressure one can use without having to have annual inspections by a certified official. Planning to install a steam engine is no light matter. If annual inspections are required the operating cost rises dramatically once one goes over a certain limit. It is likely that in all once-British domains the pressure limit is 4 bars. Regards Crispin From: Stoves [mailto:[email protected]] On Behalf Of Kevin Sent: Thursday, May 16, 2013 8:48 AM To: Discussion of biomass cooking stoves Subject: Re: [Stoves] Green Steam Engine Dear Crispin ----- Original Message ----- From: Crispin Pemberton-Pigott To: 'Discussion of biomass cooking stoves' Sent: Wednesday, May 15, 2013 9:23 PM Subject: Re: [Stoves] Green Steam Engine It is often the case that a steam boiler is allowed to operate if the pressure does not rise above 4 bars. # Yes indeed. In some cases, it is allowable to go to about 100 psig, (114.5 psia = 7.9 bar), depending on the volume of water in the boiler, and on the boiler design. Small water tube boilers could be approved for such higher pressures. Again, it depends on the rules for the particular location. Best wishes, Kevin Regards Crispin From: Stoves [mailto:[email protected]] On Behalf Of Kevin Sent: Thursday, May 16, 2013 4:58 AM To: Discussion of biomass cooking stoves Subject: Re: [Stoves] Green Steam Engine Dear Bryce Certainly a "Closed Loop" or "condensing system" is more efficient than an non-condensing system. While the steam engine may not require Certification, boilers do, depending on the rules in a given Jurisdiction. While it is certainly possible to operate a steam boiler "in a back woods location that the Boiler Inspector doesn't know about", The Boiler Inspector will find out if there is an accident where someone is seriously injured or killed. Steam can kill. If anyone is considering a "Steam Application" they should check with their Boiler Inspector, to confirm that he would be able to approve the Proposed Project. Best wishes, Kevin ---------------------------------------------------------------------------- _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/ ------------------------------------------------------------------------------ _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
_______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
