Alfa Laval ViscoLine - VLC 104, Инструкция по эксплуатации

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Rev January.2012
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4. MEDIA REQUIREMENTS
This section of the technical manual describes, in general terms, the recommended
quality criteria for the media services.
Steam supply for the ViscoLine™-VLC
General requirements for the steam supply
The steam supply to the Alfa Laval ViscoLine™-VLC heat exchanger plant must
conform to the following general requirements:
•
The steam supply must be of good quality and free from condensate and air.
•
The outside diameter of the steam supply lines must exceed that of the steam
piping within the Alfa Laval ViscoLine™ unit.
•
The steam supply line must be equipped with a pressure controller in order to
maintain a constant feed pressure.
•
Condensate traps must be provided in close proximity to the process line in order
to produce dry steam.
•
A master shut off valve must be installed in the steam supply line.
•
The steam pipes must be insulated.
•
Before connecting the steam supply to the process line, the steam pipes must be
blown clear with repeated blasts of steam for a period of 5 to 10 minutes.
Characteristics of the steam supply
Quality
dry saturated steam
Humidity maximum 5% condensate
PH 7.0 to 8.5
Chloride maximum 8 parts per million (ppm)
Solid particles none
Turbidity maximum 3 ppm KmnO4
Potassium and sodium maximum 0.01 mg/kg
Iron maximum 0.02 mg/kg
Copper maximum 0.003 mg/kg
Nitrogen dioxide maximum 0.02 ppm
Conductivity 0.3 µS
Organic matter none
Condensate (C)
The condensate system should be designed to the same capacity, pressure and
temperature demands as those given for a steam generating system.
Water
There are three different types of water supply used in a plant: namely drinking
water, product water and service water.
Drinking water
The drinking water supply should be used for cleaning and as product flush water
also. The quality of this water supply must comply with the guidelines of the World
Health Organization (WHO), or the Drinking Water Directive of the European
Economic Community (CEE). For more specific data contact Alfa Laval. The pipe
work of the drinking and cleaning water supply must be equipped with master shut off
valves. The supply must remain constant.