Burnham Series 8H/8HE Boiler Manual De Propietario
46
c
ORRE
c
TION
fA
c
TOR
fOR
c
OMPRE
ss
ION T
AN
k
s
ELE
c
TION
To use this table: (1) Enter left hand column at initial pressure, (2) Move to the right to column headed with the allowable system pressure increase, (3) Read correction factor
. (4)
Multiply correction factor by the uncorrected tank size found from
figure 3-9 to obtain the
corrected compression tank size.
fIGURE 3-10
NET
EXP
ANSION F
ACT
ORS FOR W
ATER
To use this table: (1)
for the system water temperature, read the expansion factor
directly
. (2) Multiply the expansion factor by the system volume to find the acceptance
volume of the diaphragm type tank. (3) Proceed to
figure 3-12.
fIGURE 3-1
1
Initial Pressure On c
ompression T
ank
Allowable
system Pressure Increase*
6 psi
8 psi
10 psi
12 psi
14 psi
16 psi
20 psi
25 psi
30 psi
40 psi
50 psi
75 psi
4 psi
1.0
.8
.68
.62
.59
.55
.5
.49
.48
.48
.48
.48
8 psi
1.6
1.2
1.05
.92
.85
.8
.7
.65
.6
.5
.5
.5
12 psi
2.0
1.7
1.43
1.25
1.15
1.07
.95
.8
.75
.63
.55
.54
18 psi
3.0
2.55
2.2
1.94
1.75
1.6
1.35
1.15
.98
.8
.72
.7
24 psi
4.6
3.65
3.1
2.65
2.38
2.15
1.78
1.52
1.35
1.12
1.02
1.0
30 psi
---
5.0
4.2
3.6
3.1
2.7
2.3
1.9
1.8
1.43
1.25
1.1
38 psi
---
---
5.3
4.6
4.1
3.7
3.05
2.5
2.25
1.95
1.7
1.4
50 psi
---
---
---
---
---
---
4.7
3.9
3.1
2.6
2.3
2.0
60 psi
---
---
---
---
---
---
---
4.5
3.8
3.1
2.7
2.4
70 psi
---
---
---
---
---
---
---
---
5.2
3.9
3.5
3.1
* Relief V
alve setting minus initial pressure on Relief V
alve, pump on.
Net Expansion
factors for
w
ater
, b
ased on 40°
f
100° - .0060
130° - .01
12
160° - .0190
190° - .0313
220° - .0436
110° - .0075
140° - .0133
170° - .0231
200° - .0354
230° - .0477
120° - .0093
150° - .0157
180° - .0272
210° - .0395
240° - .0518