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3. Water Flow Rates (Constant Volume Primary
Pumping Systems)
a. A constant volume primary pumping system
shall be sized so that the flow rate specified
in Table 24 can be maintained through each
boiler connected to the system.
Table 24: Water Flow Rates for Constant
Volume Primary Pumping
Arctic
Model
gpm
1000
95
1500
143
2000
190
2500
238
3000
285
3500
333
4000
380
4500
428
5000
475
5500
523
6000
570
4. Water Flow Rates for Glycol
a. For glycol systems the gpm in the flow rate
tables will increase as specified in Table 25.
Table 25: GPM Increase for Glycol System
Glycol Concentration
50%
30%
Thermal Solutions, 1175 Manheim Pike, Lancaster, PA 17601 Website: www.thermalsolutions.com
Phone: 717-239-7642 Fax: 877-501-5212 Email: sales@thermalsolutions.com
Maximum Flow Rate
High Fire Δ
Δ P (ft)
T (°F)
12.7
20
9.2
20
16.3
20
20
20
28.7
20
11.33
20
15.17
20
25.17
20
33.5
20
37.25
20
37.92
20
GPM Percent Increase
24%
14%
VI. Before Operation
A. Pre-Boil Out Flushing of System
Much of the dirt and contamination in a new hot
water system can be flushed out before the boil out
of the system. First, flush the system of waste with
clear water. The boiler and circulating pumps must be
isolated through the successive zones of the system
to waste, carrying metal shavings, dirt, pipe joint
compound, etc. with it. Follow with a chemical flush.
WARNING
WARNING
Be CERTAIN that the chemicals used to flush
and boil-out the boiler and system contain NO
CHLORIDES. The boiler is fabricated with austenitic
stainless steels that can be severely damaged when
exposed to chlorides.
The removal of pipe chips and other debris from the
system before opening the isolation valves to the
boiler and pumps will help to protect this equipment
from damage by such debris.
In combination with system contamination, bacteria
from ground water boiler water may produce
objectionable odors, sometimes resembling the
odorant used in natural gas. It is important to keep
these fumes from air intakes that would distribute
them throughout the building.
B. Boiler Out Procedure
WARNING
WARNING
The boil out procedure outlined must be performed
by, or under the direct supervision of, a qualified
technician. The chemicals used present a hazard of
burns and physical injury if mishandled. Always use
a suitable facemask, goggles, protective gloves, and
garments when handling caustic chemicals. Do not
permit the chemical to come into contact with skin
or clothing. Always follow the safety precautions
on the container's label. Add chemicals slowly and
in small amounts to prevent excessive heat and
agitation.
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