Powerex MTSD0503 - Page 5

Scroll Medical & Laboratory Compressed Air Systems
Powerex • 150 Producon Drive • Harrison, OH 45030 • USA
P 1.888.769.7979 • F 513.367.3125 • www.powerexinc.com
IN907800AV • 08/2018
Page 5 of 40
The equivalent straight length is the length of all the pipe needed
from the ex connector to the origin point, plus a factor for each
elbow or T.
If system extends beyond 600 equivalent straight feet, use one size
larger pipe.
Pipe should be smooth ID, if rough pipe is used increase by one size.
Pipe Size
Equivalent length for 90°
elbow, cross, or tee
Equivalent length for
45° elbow
1.5 3.75 feet 1.8 feet
2.0 5.0 feet 2.5 feet
2.5 6.25 feet 3.1 feet
3.0 7.5 feet 3.8 feet
3.5 8.78 feet 4.4 feet
4.0 10.0 feet 5.0 feet
5.0 12.5 feet 6.25 feet
Size the piping for the maximum rated ow of the system. Medical
air systems have one pump in reserve per NFPA 99.
PIPE SIZE REQUIREMENTS
System CFM
Minimum
Pipe Size for
100 feet
Minimum
Pipe Size for
300 feet
Minimum
Pipe Size for
600 feet
15 1.25 1.5 1.5
20 1.25 1.5 1.5
25 1.25 1.5 2
30 1.25 1.5 2
35 1.5 2 2.5
40 1.5 2 2.5
45 1.5 2 2.5
50 1.5 2 2.5
60 2 2.5 2.5
65 2 2.5 3
75 2 2.5 3
70 2 2.5 3
85 2 2.5 3
90 2 2.5 3
100 2 3 3.5
110 2.5 3 3.5
115 2.5 3 3.5
125 2.5 3 3.5
150 2.5 3 3.5
170 2.5 3.5 4
190 3 3.5 4
210 3 3.5 4
230 3 3.5 4
250 3 3.5 4
260 3.5 4 5
300 3.5 4 5
350 3.5 4 5
375 3.5 4 5
500 4 5 6
If the system extends beyond 600 equivalent straight feet, use one size
larger pipe.
Type Pump intake CFM per HP
Various scroll and oilless reciprocang 3