Burnham 8HE Series Application Instructions page 37

3
Water Piping
(continued)
Table 3-12: Expansion Tank Correction Factor
Initial
Pressure on
Compression
6 psi 8 psi 10 psi 12 psi 14 psi 16 psi 20 psi 25 psi
Tank
4 psi 1.0
8 psi 1.6
12 psi 2.0
18 psi 3.0 2.55
24 psi 4.6 3.65
30 psi --
38 psi --
50 psi --
60 psi --
70 psi --
* Relief valve setting minus initial pressure on relief valve, pump on.
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 Table 3-11 to obtain the
corrected compression tank size.
111924-01 - 2/23
Allowable System Pressure Increase*
.8 .68 .62 .59
1.2 1.05 .92 .85
1.7 1.43 1.25 1.15
2.2 1.94 1.75
3.1 2.65 2.38
5.0 4.2 3.6 3.1
-- 5.3 4.6 4.1
-- -- -- --
-- -- -- --
-- -- -- --
8HE Multiple Boiler Application Instructions
30 psi 40 psi 50 psi 75 psi
.55 .5 .49
.8 .7 .6
1.07 .95 .75
1.6 1.35 .98
2.15 1.78 1.35
2.7 2.3 1.8
3.7 3.05 2.25
-- 4.7 3.1
-- -- 3.8
-- -- 5.2
.48 .48 .48
.6 .5 .5
.75 .63 .55
.98 .8 .72
1.35 1.12 1.02
1.8 1.43 1.25
2.25 1.95 1.7
3.1 2.6 2.3
3.8 3.1 2.7
5.2 3.9 3.5
.48
.5
.54
.7
1.0
1.1
1.4
2.0
2.4
3.1
37