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APPENDIX A
3-1-2010 Page A-4
WATER CALCULATION PROCEDURE (Continued)
Table 2 – Pipe Pressure Loss (Water)
008515
STEP NO. 6 – DETERMINE TOTAL ATOMIZER
PRESSURE (TAP)
6a – Size Piping and Calculate Pipe Pressure Loss
(PPL) in Supply Line A:
Linear Length A1 through A5 + equivalent lengths of all
fittings in each pipe line x pressure loss (see Table 4) =
Pipe Pressure Loss (PPL).
Example:
3/4 in. Schedule 40 piping:
Length A1, 16.17 ft (4.929 m) + A2, 2 ft (0.610 m) + A3,
3.75 ft (1.143 m) + A4, 12 ft (3.658 m) + A5, 4 ft (1.219
m) = 37.92 ft (11.561 m)
Equivalent length of 3/4 in. tee = 2 ft (0.610 m) (see Table
1)
Note:
Because the full flow is going through one branch
of the tee, treat it the same as an elbow of the same size.
Equivalent length of 3/4 in. selector valve = 66.5 ft.
(20.3 m).
Equivalent length of 3/4 in. elbow = 2 ft (0.610 m) (see
Table 1)
Two elbows in Supply Line A = 2 x 2 ft (0.610 m) (equiva-
lent length per elbow) = 4 ft (1.219 m)
37.92 ft (11.561 m) + 2 ft (0.610 m) + 66.5 ft. (20.3 m) +
4 ft (1.219 m) = 110.42 ft (33.664 m) total equivalent
length of pipe
Select the correct pressure from Table 2 for the number of
atomizers flowing through this pipe section. Since there
are four atomizers, the pressure loss factor would be
0.10027 psi/ft (0.02267 bar/m) (see Table 2).
Pressure loss for Supply line A = 110.42 ft (33.664 m) of
3/4 in. pipe x 0.10027 psi/ft (0.02267 bar/m) = 11.07 psi
(0.763 bar).
6b – Size Piping and Calculate Pipe Pressure Loss
(PPL) in Branch Line B:
Linear length B1 and B2 + equivalent lengths of all fittings
in each pipe line x pressure loss (see Table 2) = Pipe
Pressure Loss (PPL).
Example: 1/2 in. Schedule 40 piping:
Length B1, 9.25 ft (2.819 m) + B2, 6.59 ft (2.009 m) =
15.84 ft (4.828 m)
Equivalent length of 1/2 in. elbow = 1 ft (0.30m) (see
Table 1)
One elbow in Branch Line B = 1 x 1 ft (0.30m) (equivalent
length per elbow) = 1 ft (0.30m)
Equivalent length of 1/2 in. tee = 3 ft (0.91 m) (see Table
1)
One tee in Branch Line B = 1 x 3 ft (0.91 m) (equivalent
length per side tee) = 3 ft (0.91 m)
Selector Valves
Pi
pe
Si
ze
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1/
2
0.
03
02
3
0.
10
91
2
3/
4
0.
00
76
9
0.
02
77
8
0.
05
88
6
0.
10
02
7
1
0.
00
23
8
0.
00
85
8
0.
01
81
8
0.
03
09
8
0.
04
68
3
0.
06
56
4
0.
08
73
3
0.
11
18
3
1
1/
4
0.
01
23
3
0.
01
72
8
0.
02
30
0
0.
02
94
5
0.
03
66
2
0.
04
45
2
0.
05
31
1
0.
06
24
0
0.
07
23
7
1
1/
2
0.
00
81
6
0.
01
08
6
0.
01
39
1
0.
01
73
0
0.
02
10
3
0.
02
50
9
0.
02
94
7
0.
03
41
8
0.
03
92
1
0.
04
45
6
2
0.
00
87
4
0.
01
01
4
0.
01
16
3
0.
01
32
1
Pi
pe
Si
ze
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1/
2
0.
00
68
3
0.
02
46
7
3/
4
0.
00
17
4
0.
00
62
8
0.
01
33
0
0.
02
26
7
1
0.
00
05
4
0.
00
19
4
0.
00
41
1
0.
00
70
0
0.
01
05
9
0.
01
48
4
0.
01
97
4
0.
02
52
8
1
1/
4
0.
00
27
9
0.
00
39
1
0.
00
52
0
0.
00
66
6
0.
00
82
8
0.
01
00
6
0.
01
20
1
0.
01
41
0
0.
01
63
6
1
1/
2
0.
00
18
5
0.
00
24
6
0.
00
31
4
0.
00
39
1
0.
00
47
5
0.
00
56
7
0.
00
66
6
0.
00
77
3
0.
00
88
6
0.
01
00
7
2
0.
00
19
8
0.
00
22
9
0.
00
26
3
0.
00
29
9
W
at
er
Pr
es
su
re
Lo
ss
ps
i/
fo
ot
of
Pi
pe
N
um
be
r
of
A
to
m
iz
er
s
W
at
er
Pr
es
su
re
Lo
ss
ba
r/
m
et
er
of
Pi
pe
N
um
be
r
of
A
to
m
iz
er
s