Building Services Handbook, Third Edition by Fred Hall, Roger Greeno BA(Hons.) FCIOB FIPHE FRSA

By Fred Hall, Roger Greeno BA(Hons.) FCIOB FIPHE FRSA

Construction prone guide, 3rd version ПРОФЕССИИ И РЕМЕСЛА, ДОМ и СЕМЬЯ Автор: Fred corridor, Roger GreenoИздательство: Butterworth-HeinemannДата публикации: may possibly 20, 2005ISBN: 0750664606Язык: EnglishКоличество страниц: 544Формат:PDFРазмер: nine MBThe designated, hugely visible presentation of this instruction manual has made it the fundamental at-a-glance consultant to most sensible perform and development laws compliance for college kids and professionals.com0

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Example text

Drinking water is available at every draw-off point and maintenance valves should be fitted to isolate each section of pipework. With every outlet supplied from the main, the possibility of back siphonage must be considered. Back siphonage can occur when there is a high demand on the main. g. a rubber tube attached to a tap or a shower fitting without a check valve facility left lying in dirty bath water. Notes: (1) Servicing valves to be provided on supply pipes to storage and flushing cisterns.

The installation is much simpler and less costly than the previous two systems as there is less need for specialised items of equipment. Sizing of the pump and its delivery rating are critical, otherwise it could persistently overrun, or at the other extreme be inadequate. Modern pumps have variable settings allowing considerable scope around the design criteria. g. in an office block it may commence an hour before normal occupancy and run on for a couple of hours after. Water delivery should be just enough to meet demand.

Resin and fillers are mixed with a catalyst and after application to pipe threads, tightened joints will require time to set. PTFE tape † wound into threads prior to joint tightening. Chemical and temperature resistant with an element of flexibility. Suitable for water and gas pipe joints. Also available as a liquid, but relatively expensive. BS 7786: Specification for unsintered PTFE tape BS EN 751-3: Sealing materials for metallic threaded joints Solders and fluxes † the established method for economically jointing copper pipe and fittings.

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