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 e
ff
. 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.
Example:
E
ff
ective Pipe Length Equivalent to each 90 degree Elbow
Pipe Size (in.)
1.00
1.25
1.50
2.00
2.50
3.00
3.50
4.00
5.00
6.00
8.00
E
ff
ective Pipe Length (ft)
3.0
3.4
4.0
4.9
6.4
7.9
9.4
10.0
11.9
13.2
14.5
Table 2.3 Pipe Length for 90
o
Elbow
Lubricated Rotary Vane Laboratory Vacuum Systems
4107 9021 88.01
2-6
