By Fred Hall, Roger Greeno BA(Hons.) FCIOB FIPHE FRSA
Development companies instruction manual, 3rd variation ПРОФЕССИИ И РЕМЕСЛА, ДОМ и СЕМЬЯ Автор: Fred corridor, Roger GreenoИздательство: Butterworth-HeinemannДата публикации: may well 20, 2005ISBN: 0750664606Язык: EnglishКоличество страниц: 544Формат:PDFРазмер: nine MBThe distinctive, hugely visible presentation of this instruction manual has made it the fundamental at-a-glance advisor to most sensible perform and construction laws compliance for college kids and professionals.com0
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Extra info for Building Services Handbook, Third Edition
Hence the limitations of direct hot water systems (see page 37) where fresh water is continually introduced. Direct systems are only applicable where water hardness is less than 150 ppm and water temperatures do not exceed 65ƒC. The water temperature in modern hot water and heating systems exceeds 80ƒC, therefore direct systems are effectively obsolete in favour of indirect installations, (see page 38). Indirect systems have the same water circulating throughout the primary and heating pipework and it is only drained off during maintenance and repair.
Deposits internally are removed by flushing the system. 11 Water mains Water mains have been manufactured from a variety of materials. The material selected must be compatible with the water constituents, otherwise corrosion and decomposition of the pipes may occur. Contemporary materials which suit most waters are ductile cast iron to BS EN 545 and uPVC to BS EN 1452-2. The water undertaking or authority must be consulted prior to laying mains to determine suitable materials, laying techniques and pipe diameter.
It contains three pressure zones separated by differential obturators (two positively loaded check valves). Each pressure zone has a test point to verify that the valve is functioning correctly. Refs. The Water Supply (Water Fittings) Regulations. BS EN 1717: Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflow. 21 Cold Water Storage Cisterns Cisterns can be manufactured from galvanised mild steel (large nondomestic capacities), polypropylene or glass reinforced plastics.