Mechanical Installation
21
Table 2-5 Maximum Allowable Difference
Parameters
Maximum Allowable
Value(m)
Maximum length of
pipeline
Maximum equivalent length of discharge pipe L1
70
Maximum equivalent length of liquid return pipe L2
130
Maximum equivalent length of suction pipe L3
60
Maximum equivalent length of branch liquid pipe L4
40
Maximum equivalent length of branch discharge pipe L5
40
Height difference
Height difference between main unit
and condenser H1
Condenser on top
20
Condenser at bottom
5
The height difference between terminal
and condenser H2
Condenser on top
40
Condenser at bottom
10
Height difference between terminal and
main unit H3
Main unit on top
20
Main unit at bottom
5
Height difference between terminals H4
15
Note: For the applications with larger piping lengths or height differences, consult Vertiv local representative.
Example
The calculation of the piping equivalent length are as follows:
For the discharge pipe L1, if the actual length is 30 m, then 90° elbows; two oil traps are used; and the pipe diameter is 25
mm, the equivalent length of the discharge pipe is: 30 + 0.5 x 10 + 3.4 x 2 = 41.8 (m)
Refer to
to confirm the local equivalent length according to the pipe diameter.
Table 2-6 Local Equivalent Length
Pipe Diameter
Local Equivalent Length (m)
(mm)
(inch)
90°elbow
45°elbow
“T” Shaped 3-way Connector Oil Trap
9.52
3/8
0.21
0.10
0.76
1.3
12.7
1/2
0.24
0.12
0.76
1.5
16
5/8
0.27
0.15
0.76
2.0
19
3/4
0.3
0.18
0.76
2.4
22
7/8
0.44
0.24
1.1
3.0
25
1
0.5
0.27
1.2
3.4
28
1-1/8
0.56
0.3
1.4
3.7
32
1-1/4
0.62
0.34
1.6
4.0
35
1-3/8
0.68
0.38
1.8
4.4
