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24
20
20
c2
c1
c
20
20
b2
b1
b
20
20
a2
a1
a
30 m 30 m 10 m10 m
80 m
60 m
M
B:
If, on the other hand, a green spray lance is selected = 33 l/min + a standard spray lance = 17
l/min the maximum load on the line b-c = 33 l/min.
PRESSURE
DROP
Use of 50 m ∅15 mm pipe will result in a pressure drop of: 9.3 bar
Maximum load on line a-b = 50 l/min.
Use of 40 m ∅22 mm pipe will result in a pressure drop of: 2.0 bar
Maximum load on line M-a = 50 l/min.
Use of 70 m ∅22 mm pipe will result in a pressure drop of: 3.2 bar
Total pressure drop 14.5 bar
The aggregate pressure drop on the three lines is less than 15 bar and the dimension require-
ments have therefore been met.
Example 2
Branched system
Selection of spray lance: 2 green spray lances each of 33 l/min
2 blue spray lances each of 17 l/min
PRESSURE
Maximum load in each branch is 33 l/min DROP
Use of∅15 mm pipe on e.g. the a-a2 line
(20m) will result in a pressure drop of: 4.0 bar
Maximum load on line b-c = 66 l/min
Use of 30 m ∅22 mm pipe will result in a pressure drop of: 2.5 bar
Maximum load on line a-b + M-a = 101 l/min
Use of 40 m ∅22 mm pipe will result in a pressure drop of: 7.5 bar
Total pressure drop 14.0 bar
The aggregate pressure drop on the three lines is less than 15 bar and the dimension require-
ments have therefore been met.