Install Instructions

111
IM-PR 566442 1114 (Design Manual)
0.1
1.0
10.0
100.0
0 0 0 1
10
Flow Rate (GPM)
Pressure Drop, 50% Propylene Glycol (FT OF HEAD PER FT OF TUBING)
0.5
5.0
50.0
3
2
4
5
6
8
0.4 0.5 0.6
0.8
0.3
0.2
0.2
0.1 0.08 0.05 0.04
0.03
0.06
0.002 0.003
0.004 0.006
0.01 0.001 0.008
Type M Copper Tubing
200.0
Table 5-14 Fifty percent propylene glycol pressure drop table for Type M copper tubing
5.6.3 Glycol expansion tank selection
Glycol solutions require larger expansion tanks
than 100% water solutions. Expansion tanks for
glycol solutions are typically at least 1.2x the size
of those required for 100% water solutions. To size
an expansion tank for a glycol solution, use the
same equation that you would to size a 100% water
solution. When using the following equation to size
an expansion tank for a glycol solution, be sure
to use the appropriate densities of the % glycol
solution based on the type of glycol (i.e., propylene
or ethylene), and the values provided in Table 5-15
and Table 5-16.
where
Vt = minimum tank volume (gal)
Vs = fluid volume in system (gal)
Dc = density of the fluid at its initial start
temperature (lbs/ft
3
), whether water or glycol mix
Dh = density of the fluid at its maximum operating
temperature (lbs/ft
3
), whether water or glycol mix
Pa = air side pressurization on the opposite side of
the bladder, typically set at 12 psi from factory (psi)
Prv = pressure relief valve setting in (psi)
V
t
= V
s
(
D
c
D
h
) (
P
rv
+ 9.7
P
rv
- P
a
- 5
)
•
•
-1
1½"
3½"
2½"
1¼"
¾"
½"
⅜"