AWE SPD2H, Руководство пользователя

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G01
SPD Owner's Manual
1
DESCRIPTION
The Model SPD2 or SPD3 is a reverse osmosis (RO) type water purification system designed for on
line, or demand use, for applications such as the supply of hemodialysis machines.
Typically the RO is used with other equipment upstream, such as granular activated carbon filters and a
water softener.
The reverse osmosis system splits the incoming feed water into two streams: A) The product stream
which has been microfiltered by passage through the membrane and which contains less than four
percent of the feed salt concentration, and B) the reject stream which is concentrated in the matter
removed from the product stream. The ratio of the product water to the feed water is called the
recovery ratio. This ratio is approximately 50%.
IDENTIFICATION OF ITEMS IN SYSTEM
The major items in the SPD model are the prefilters, the submerged high pressure pump, and the spiral
wound reverse osmosis modules. The reverse osmosis modules are mounted vertically in the rear of
the system and are accessible from the back and right side by removing a screwed on cover. The other
items are identified in the photographs and minimally below.
Moving counterclockwise from the top left of Figure 1, Front Inside View, we identify the following items
:
The Filter Vent Valve is used after filter replacement to vent air to drain.
The Pump Vent Valve is used after start-up to vent air in the pump housing to drain.
The Annulus Drain Valve is opened during rinsing following disinfection to empty the otherwise dead
volumes in each module.
The Product Dump Solenoid Valve sends product water to drain when ionic quality is below limit or
when toggled by the mute switch.
The Reject Pressure Regulator controls the pump outlet pressure by relieving excess reject water to the
pump inlet stream.
The Product Return Check Valve returns unused product water from the distribution loop to the pump
inlet stream and prohibits flow in the reverse direction.
The Product to Tank Valve is opened during disinfection and returns product water to the disinfection
tank. Normally it is closed.
The Product Pressure Regulator maintains product water backpressure by dumping
excess product water into the pump inlet stream. There may be two regulators in parallel on the SPD3.
The Submerged Pump boosts the inlet water pressure to about 195 PSI before application to the RO
modules.