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Figure 4.
Assembly options for "C" model tanks
c. Hydrostatic Testing. Hydrostatic tests are
normally done on all piping systems. If a hydrostatic test
is specified before coolant is put in the system, the tanks
should not be part of this test and should be valved off.
This is because if pure water is pumped into the heat
exchanger it cannot be removed. After the successful
completion of the test, drain the system and add premixed
glycol to the system as described in Section IV.D.2.
If the specifications call for a complete hydrostatic
pressure test of the entire system, including tank heat
exchangers, completely fill system with glycol/water
solution and remove air. Then increase air pressure in the
expansion tank up to the hydrostatic test pressure
(maximum 150 Psi/1034 kPa). After 30 minutes close
off all valves on each tank and let sit for the
prescribed period of time. Monitor system pressure
as tank valves are sequentially opened.
Liquid level and/or pressure switches in the expansion
tank are recommended to alert operators of a shortage of
liquid in the system. Since these systems contain a
valuable heat transfer solution, steps should be taken to
prevent the loss of the liquid. The tank farm as a whole
should be capable of isolation by valves. A twostep alarm,
triggered by either low liquid level in the expansion tank or
low pressure at the high point of the building, should be
installed. The first level of alarm is to alert the operator of
routine requirements for the system's fluid. The second
IB-SVX186B-EN
level would be for extremely low level/pressure indicating
a major leak and should close automatic valves to isolate
the tanks and other parts of the system
Make-up systems using city water are not
recommended because adding water alone will
dilute the coolant. If an automatic coolant make-up
system is required, CALMAC® GMS liquid pressurization
system, which adds premixed solution is recommended.
Indoor installations should have floor drains in
accordance with local codes.
d. Recommended Filling Sequence.
i. Add Water to Tank. After the tanks are in final
position and plumbed, CALMAC® recommends that tanks
be initially filled with water to approximately 90% of final
fill height, or about 6 tubes below the top HX tube. At this
time the Biocide should be added to the water. See section
IV.D.4. After the tank heat exchangers are filled with
coolant, the water level would be brought to the final
correct height, just covering the top heat exchanger (HX)
tube, except for Model 1220, which is filled to the bottom
of the top HX tube. Partially or fully buried tanks
should be filled with water as soon as practically
possible to prevent tank flotation, should the burial
pit accumulate with water.
Introduction
7
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