ZURN PEX® RESIDENTIAL FIRE PROTECTION SYSTEMS
INSTALLATION INSTRUCTIONS
11
FITTING
SIZE
1" XL BRASS 1" CR PLASTIC 1-1/4" XL BRASS 1-1/2" XL BRASS 2" XL BRASS
Tee Run 1.65 6.93 2.95 3.11 3.32
Tee Branch 10.76 24.55 13.12 15.74 21.14
Elbow 9.98 23.61 13.17 14.44 20.85
Coupling 1.45 6.79 1.90 2.09 2.29
FST - Run* 1.84 - - - -
FST - Branch* 20.23 - - - -
GPM
1" 1.25" 1.5" 2"
PRESSURE
DROP
VELOCITY
(FT/SEC)
PRESSURE
DROP
VELOCITY
(FT/SEC)
PRESSURE
DROP
VELOCITY
(FT/SEC)
PRESSURE
DROP
VELOCITY
(FT/SEC)
5 0.017 2.7 0.006 1.8 0.003 1.3 0.001 0.8
8 0.041 4.4 0.015 2.9 0.007 2.1 0.002 1.2
10 0.062 5.5 0.023 3.7 0.010 2.6 0.003 1.5
11 0.074 6.0 0.028 4.0 0.012 2.9 0.003 1.7
12 0.087 6.6 0.033 4.4 0.015 3.2 0.004 1.8
13 0.101 7.1 0.038 4.8 0.017 3.4 0.005 2.0
14 0.116 7.7 0.044 5.1 0.020 3.7 0.005 2.2
15 0.132 8.2 0.049 5.5 0.022 4.0 0.006 2.3
16 0.148 8.8 0.056 5.9 0.025 4.2 0.007 2.5
17 0.166 9.3 0.062 6.3 0.028 4.5 0.007 2.6
18 0.184 9.9 0.069 6.6 0.031 4.8 0.008 2.8
19 0.204 10.4 0.077 7.0 0.034 5.0 0.009 2.9
20 0.224 11.0 0.084 7.4 0.038 5.3 0.010 3.1
21 0.245 11.5 0.092 7.7 0.041 5.5 0.011 3.2
22 0.267 12.1 0.100 8.1 0.045 5.8 0.012 3.4
23 0.290 12.6 0.109 8.5 0.049 6.1 0.013 3.5
24 0.314 13.2 0.118 8.8 0.053 6.3 0.014 3.7
25 0.338 13.7 0.127 9.2 0.057 6.6 0.015 3.8
26 0.364 14.3 0.137 9.6 0.061 6.9 0.016 4.0
27 0.390 14.8 0.147 9.9 0.066 7.1 0.018 4.2
28 0.417 15.4 0.157 10.3 0.070 7.4 0.019 4.3
29 0.445 15.9 0.167 10.7 0.075 7.7 0.020 4.5
30 0.474 16.5 0.178 11.0 0.080 7.9 0.021 4.6
31 0.504 17.0 0.189 11.4 0.085 8.2 0.023 4.8
32 0.534 17.6 0.201 11.8 0.090 8.4 0.024 4.9
33 0.565 18.1 0.213 12.1 0.095 8.7 0.026 5.1
34 0.225 12.5 0.101 9.0 0.027 5.2
35 0.237 12.9 0.106 9.2 0.028 5.4
40 0.303 14.7 0.136 10.6 0.036 6.2
45 0.377 16.5 0.169 11.9 0.045 6.9
50 0.206 13.2 0.055 7.7
55 0.245 14.5 0.066 8.5
60 0.288 15.8 0.077 9.2
65 0.334 17.2 0.090 10.0
70 0.383 18.5 0.103 10.8
75 0.117 11.5
80 0.132 12.3
90 0.164 13.9
100 0.199 15.4
110 0.237 16.9
120 0.278 18.5
Appendix
TABLE 1: PRESSURE DROP FOR ZURN PEX TUBE - PSI/FOOT
TABLE 2: FITTING EQUIVALENT LENGTH - FEET OF TUBE
How Fitting Equivalent Length Is Calculated
Zurn PEX fire protection fittings are flow tested
according to the requirements laid out in UL
1821 and ANSI/ISA-S75.02 - 1996. Fitting and
tube samples were subjected to five dierent
flow velocities between 10 and 18 ft/second. The
measured pressure loss across each fitting was
divided by the pressure loss of 1 foot of tube
tested at the same flow velocity to calculate the
equivalent length. The equivalent lengths of the
five flow velocities were averaged to determine
the fitting equivalent length.
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