1、ENGINEERING STANDARDS SECTION 5 PLUMBING ?InterContinental Hotels Group Asia Pacific 291 2005 Revision All Rights Reserved 5.2. WATER SOFTENING SYSTEM?.292 5.2.1. GENERAL?. 292 5.2.2. DESIGN CRITERIA?. 292 5.2.3. SPECIFICATION & APPLICATION GUIDE?. 292 5.2.4. ENVIRONMENT & ENERGY CONSERVATION?. 293
2、5.2.5. SPACE ALLOCATION! #$. 293 ENGINEERING STANDARDS SECTION 5 PLUMBING ?InterContinental Hotels Group Asia Pacific 292 2005 Revision All Rights Reserved 5.2. WATER SOFTENING SYSTEM ? 5.2.1. GENERAL %&%&%&%& Pressure type zeolite, duplex softeners should be provided where indicated by water analys
3、is and water supply requirements. ()+*,-./$?+0?12?34?5?126+798 5.2.2. DESIGN CRITERIA :?;=:?;=:?;=:?;?BA?/9CD-.?2/?$E9FGH9IJ?2KL9MNPORQ?ST?UVW?XYM+Z?2?C?_aM The extent to which water is softened should be based on softening requirements. 2BC#-.aL?bc-?.?7deXY8 The following hardness levels shall be a
4、chieved: 2BCfK?L?ghi?j?k?2?lm Boilers: 0 ppm no Kitchens: 0 ppm for dish/ glass washers, coffee machines. pq0 ppm rs?t/uv!w+xyv Laundry/Kitchens: 50 ppm. Hard water can be used for last two rinse cycles in laundry washing machines. s?zq?|pq50 ppm8?sz?v!C#?s?a9M#E?K2Y8 Cooling Towers: 120 ppm Hot wat
5、er systems: Depending on Langelier index which should be slightly positive on a scale 2 to +2, or index = 7 on a scale 0 to 14. 2?2?i ?i 8 Note: Dishwashers may need water desalinated by a dedicated Reverse Osmosis plant. stv67!C#2!M6?!CD+?G?H8 Softened water system requires non-return fixtures to p
6、revent backflow. -.2?7df/$BMFD#Y8 5.2.3. SPECIFICATION & APPLICATION GUIDE ? Equipment shall be as follows: ?j?km Type of Operation ? Automatic Number of Softening Units -. Two (minimum)M 2 Diameter Each Unit ? Based on maximum 5.4l/s per m, with two softener units on line Fl?5.4/?DMg2#-?.?YY8 ENGIN
7、EERING STANDARDS SECTION 5 PLUMBING ?InterContinental Hotels Group Asia Pacific 293 2005 Revision All Rights Reserved Type of Operation ? Automatic Design Pressure ?( 10% greater than maximum inlet (10% Main Operating Valve Motor operated multiport or hydraulic valve nest Q? Tank Construction 2? Fib
8、re glass ? Type Main Piping + CT or PVC | Size Main Piping Maximum velocity 2.5 m/s +2.5 / Meters (One Per Unit) 2#?Y Turbine type with auto reset head +)?MD+OQ+? Type Exchange Resin ?) High capacity polystyrene ? Cubic Feet Resin/Unit ?6BC? 760mm minimum depth ?L?760 Resin Exchange Capacity ?+( 700
9、,000gr/m 700,000/ Salt Z 100 kilos per m 100/ Regeneration ? 1 per day, each unit (maximum) ?!M?M?1? Shell Height ?L As required to hold resin with 25% free board above bed. 7d?M ?!?#?$Mf&%25%! 8 Brine Saturator Tank Z?2?( Fibre glass construction - size for one weeks salt. ?BM?!m)1*Z?&+#E Brine Mea
10、suring Tank Z?2V?( Fibre glass construction - size for one regeneration ?BM?!m),+EY8 Brine Piping Z?2 Brass - UPVC 5.2.4. ENVIRONMENT & ENERGY CONSERVATION .?/103214?5.?/103214?5.?/103214?5.?/103214?5 Softening of waters in hard water areas reduced the amount of precipitation and deposition of salts
11、 onto heating elements, etc. This reduced efficiency of heat transfer to systems, which increases energy consumption and costs. Limit softening to the absolute minimum. Generally, cold water does not have to be softened, unless extremely hard. ?K2?6M#2!C#-.?EF7?Z?8?9?:?;?=Y8?7BA#?BCC?DME?8FAD1GH?I?J
12、98g-?.&KTaL98?LM?N!M2?O?P-.Q,RTS?U?VWKY8 5.2.5. SPACE ALLOCATION XBY ZXBY ZXBY ZXBY Z Floor space is required for the following items: k?6+7!C#?B Item _ Approx Dimensions ?a1b?c?a1b?c?a1b?c?a1b?c Salt storage ZBC?d 6 pallets - 3 x 3 x 2m high 6?e?f-3 x 3 x 2? ENGINEERING STANDARDS SECTION 5 PLUMBING
13、 ?InterContinental Hotels Group Asia Pacific 294 2005 Revision All Rights Reserved Resin tank ?( 1 x 1 x 2.4m high 1 x 1 x 2.4? Brine tank Z?2?( 1 x 1 x 1.5m high 1 x 1 x 1.5? O/A softener dimensions O/A-.?g? 1.2 x 3.2 x 2.4m high 1.2 x 3.2 x 2.4? The above is based on a large size twin softener delivering 11.4m/hr however plant size does not reduce relative to demand. ;?7dh?i?j?k!C l-.?g?;CMU?D0?1nm?o1pC2BMvq?O!IfJ?qr?7dY8
