Determine the diameter of a suitable air main

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Reference no: EM13879745

Using the nomogram and charts.

Types of fitting	Equivalent pipe length in m.
	Inner pipe diameter in mm.
	25	40	50	80	100	125	150
Seat valve	6-Mar	10-May	15-Jul	25-Oct	15-30	20-5C	25-60
Diaphragm valve	1.2	2	3	4.5	6	8	10
Gate valve	0.3	0.5	0.7	1	1.5	2	2.5
Elbow	1.5	2.5	3.5	5	7	10	15
Bend r=d	0.3	0.5	0.6	1	1.5	2	2.5
Bend r=2d	0.15	0.25	0.3	0.5	0.8	1	1.5
Hose connection T-piece	2	3	4	7	10	15	20
Reducer	0.5	0.7	1	2	2.5	3.5	4

Table of equivalent pipe lengths for valves and fittings as used on air distribution systems

Determine the diameter of a suitable air main for the distribution of 6 m³ min-1 FAD.

System pressure is 6 bar, the length of the pipe run is 175 metres, and a maximum pressure drop of 0.3 bar is allowed.

The distribution main must also include the following : . 4bends(r=2d) . 2 elbow fittings . 6 tee connectors . 2 diaphragm valves.

Reference no: EM13879745

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