Nortec DRAABE Pure Water System - Manual (Page 27)

Created: 21.09.2006
Changed: 29.02.2008
Printed: 02.03.2009
page 27 of 59
The following requirements are placed on the incoming raw water (drinking water):
- The water must be free of suspended particles which are larger than 5µ.
- The water must be free of colloids and organic substances.
- Well water, rain water and fully desalinated water are not acceptable
- It must meet standards for drinking water (e.g. number of organic materials)
- The maximum germ content of 1000 germs/ml may not be exceeded.
- It must have no chemical substances/additives (e.g. chlorine, ozone, disinfectants).
- No additional devices (e.g. dosing facilities) which change the properties of the in-
coming raw water may be used.
- Water temperature in the range 6 – 20 °C (43-68 °F).
- Flow pressure 3 – 4 bar (44-58 psi).
If an osmosis product of some third party is used (i.e. not a DRAABE product), then the fol-
lowing values must be provided continuously by the operator:
- It must be three stage water preparation
- Water softening (<0.1 °dH at output)
- Filtering (aerosol removal filter 5u + activated charcoal filter)
- Demineralisation via reverse osmosis (inorganic membrane)
-
Water values at output of water preparation
 Water hardness < 0.1 °dH (< 17 ppm)
 Electric conductance 5-10 µS
 Water temperature 6-25 °C (43-77 °F)
 Flow pressure 2-3 bar (29-44 psi)
- No use may be made of water tanks with floating controls; rather, closed mem-
branes in stainless steel or plastic for interim storage of the product are to be used
(pressure control).
- Fittings and pipes must be made of materials which are allowed in the food industry
(plastic, stainless steel). Do not use copper pipes or brass.
- The pure water must be free of organic substances.