Form: 2435
Revision: 9
Free Flex Installation and Operation Manual
Date: 9-1-2017
Bryan Steam LLC, 783 N Chili Ave, Peru IN 46970
Web:
www.
bryanboilers
.com
Phone:
765-473-6651
Fax:
765-473-3074
Email:
27
3.5.4.3
Water Flow Rates (Constant
Volume Primary Pumping Systems)
A constant volume primary pumping system
shall be sized so that the flow rate specified in
Table 10 or Table 11 can be maintained
through each boiler connected to the system.
3.5.4.4
Water Flow Rates for Glycol
For glycol systems the gpm in Table 8, Table
9, Table 10, and Table 11 will increase as
specified in Table 12.
Glycol
Concentration
GPM Percent Increase
50%
24%
30%
14%
Table 12 GPM Increase for Glycol Systems
3.6
Before Placing Boiler In Operation
3.6.1
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
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.
3.6.2
Boil Out Procedure
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.
The boil out of the boiler and system is
neither difficult nor expensive. The chemicals
needed for cleaning are readily available. Tri-
sodium phosphate, and sodium hydroxide
(lye) are the most commonly used chemicals.
Be certain the chemicals used contain NO
CHLORIDES. Use only one type of solution
in the system. The amount of chemical
required will vary according to conditions, but
one pound per fifty gallons of water is
suggested.
