SECTION III
UL EX-4510 12-1-01 Page 3-4
General Information
SYSTEM LIMITATIONS (Continued)
Flow Calculation Limitations (Continued)
• Maximum elevation difference in pipe runs:
– Statement No. 1. If nozzles are only located above the
tank outlet, then the maximum elevation difference
between the tank outlet and the furthest horizontal
pipe run or discharge nozzle (whichever is furthest)
shall not exceed 100 ft. (30.5 m). See Figure 1.
– Statement No. 2. If nozzles are only located below the
container outlet, then the maximum elevation differ-
ence between the tank outlet and the furthest horizon-
tal pipe run or discharge nozzle (whichever is furthest)
shall not exceed 100 ft. (30.5 m). See Figure 1.
– Statement No. 3. If nozzles are located both above
and below the tank outlet, then the maximum eleva-
tion difference between the furthest horizontal pipe
runs or discharge nozzles (whichever is furthest) shall
not exceed 100 ft. (30.5 m). See Figure 1.
Note: If a system design violates these limits, contact Ansul
to determine what action has to be taken.
FIGURE 1
006050
TABLE OF MINIMUM AND MAXIMUM FLOW RATES
Minimum Flow Maximum Flow
Pipe Size Rate (SCFM) Rate (SCFM)
1/4 SCH 40 31 185
3/8 SCH 40 58 348
1/2 SCH 40 99 591
3/4 SCH 40 189 1136
1 SCH 40 331 1985
1 1/4 SCH 40 619 3712
1 1/2 SCH 40 877 5260
2 SCH 40 1536 9217
2 1/2 SCH 40 2285 13712
3 SCH 40 3712 22269
4 SCH 40 6820 40920
5 SCH 40 11354 68123
6 SCH 40 17248 103486
8 SCH 40 32487 194922
1/2 SCH 80 73 438
3/4 SCH 80 148 891
1 SCH 80 268 1607
1 1/4 SCH 80 520 3118
1 1/2 SCH 80 747 4484
2 SCH 80 1331 7988
2 1/2 SCH 80 1994 11967
3 SCH 80 3273 19637
4 SCH 80 6083 36498
5 SCH 80 10197 61184
6 SCH 80 15337 92021
8 SCH 80 29218 175311
1/2 SCH 160 51 307
3/4 SCH 160 95 570
1 SCH 160 185 1108
1 1/4 SCH 160 417 2500
1 1/2 SCH 160 577 3461
2 SCH 160 974 5843
2 1/2 SCH 160 1634 9806
3 SCH 160 2618 15708
4 SCH 160 4787 28724
5 SCH 160 7962 47773
6 SCH 160 12080 72482
8 SCH 160 22523 135139
100 FT.
(30.5 m)
100 FT.
(30.5 m)
50 FT.
(15.2 m)
50 FT.
(15.2 m)
100 FT.
(30.5 m)
100 FT.
(30.5 m)
100 FT.
(30.5 m)
STATEMENT NO. 1
STATEMENT NO. 2
STATEMENT NO. 3
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