Required Length Of Straight Pipe - E+E Elektronik EE771 Series Manual

3.4.

Required length of straight pipe

The flow meter should be installed as far as possible from disturbances of the flow. The causes for disturbance
of the flow are for instance, reducers, elbows, T-pieces, valves, gate valves, etc. The specified measurement
accuracy can be achieved only when the following straight inlet and outlet pipe lengths are installed:
•
The wall thickness of the inlet and outlet pipe should be 2,6 mm.
•
The stated values are as a minimum. If possible, allow for greater distances.
•
Valves or gate valves should be installed downstream of the flow meter.
•
With lighter gases the inlet straight pipe should be longer.
nominal pipe size (DN)
flow direction
straight inlet pipe
Type
Extension
Reduction
90° - elbow
Two 90° - elbows,
in one level
Two 90° - elbows,
in two levels, T-piece
Valve, gate valve
10
straight outlet pipe
(DN = Nominal Pipe Size)
Straight inlet pipe Straight outlet pipe
15 x DN
15 x DN
20 x DN
25 x DN
30 x DN
50 x DN
5 x DN
5 x DN
5 x DN
5 x DN
5 x DN
5 x DN