E+E Elektronik EE771 Series - 3. INSTALLATION; 3.4. Required length of straight pipe

10
Type
(DN = Nominal Pipe Size)
Straight inlet pipe Straight outlet pipe
Extension 15 x DN 5 x DN
Reduction 15 x DN 5 x DN
90° - elbow 20 x DN 5 x DN
Two 90° - elbows,
in one level
25 x DN 5 x DN
Two 90° - elbows,
in two levels, T-piece
30 x DN 5 x DN
Valve, gate valve 50 x DN 5 x DN
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.
owdirection
straight inlet pipe
nominal pipe size (DN)
straight outlet pipe