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Lubricated Rotary Vane Laboratory Vacuum Systems
Table 2.3 Pipe Length for 90
Pipe Size (in.)
Effective Pipe Length (ft)
Example:
Select the pipe size for a Triplex 7.5 Hp with 130 feet of straight pipe and six elbows:
A)
Select the pipe size of 3" diameter for 130 feet of straight pipe.
B)
Determine the eff . pipe length for an elbow of 3" dia. (EPL= 7.9 ft / elbow).
C)
Calculate the SYSTEM PIPE LENGTH {SPL (3.0" D) = 130 + (6 x 7.9) = 177.4 ft}
D)
Check this SYSTEM PIPE LENGTH to see if it exceeds the minimum pipe size. In this case it does, select
the next larger pipe size from the table (D = 4").
E)
To double-check the pipe size, recalculate the SPL with the new diameter. SPL (D = 4") = 130 + (6 x 10.0)
= 190 ft. This is in the allowable range.
4107 9021 88.01
Elbow
o
Effective Pipe Length Equivalent to each 90 degree Elbow
1.00
1.25
1.50
3.0
3.4
4.0
2.00
2.50
3.00
3.50
4.9
6.4
7.9
9.4
2-6
4.00
5.00
6.00
8.00
10.0
11.9
13.2
14.5
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