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1) The typeface on the label matches with the diameter of the pipes.
2) The label indicates the name and direction of the fluid.
3) The label is eye-catching and struck reliably.
5.5.2.9 Cleaning of Pipes
After the pressure test, the system should be rinsed one section by another with the
maximum allowed flow or the flow no less than 2m/s until leaving water is as clean and
transparent as entering water. For the heat pump system, it can be put into normal use until it
has been rinsed (leaving water is as clean and transparent as entering water.) and has taken a
trial run for about 2 hours.
5.5.2.10 Protection for the Finished Product
(1)Prefabricating, anti-corrosion treatment, setup, and pressure test procedures go closely
one by once. If interrupted, the open mouth of pipes should be closed to prevent foreign
matter entering.
(2)Installed pipes can’t be taken as the lifting center, and also can’t be stepped on.
(3)Pipe repair should be finished prior to external decoration and do not damage any wall
and floor finished product after external decoration.
(4)During external decoration, installed pipes, valves, gauges etc. should be guarded by ap-
pointed personnel to prevent them from being damaged in other construction procedure.
5.5.3 Installation of the Expansion Tank
An expansion water tank should be installed for the closed-circuit water system to buffer
water expansion and constriction as well as avoid effects on the water pipes caused by
makeup water.
A Series Modular-type Air-cooled (Heat Pump) Chiller
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