Sierra 241-VTP, 240-VTP instruction manual Unobstructed Flow Requirements

Chapter 2 Installation Series 24-HP Instruction Manual

Unobstructed Flow Requirements

Select an installation site that will minimize possible distortion in the flow profile. Valves, elbows, control valves and other piping components may cause flow disturbances. Check your specific piping condition against the examples shown below. In order to achieve accurate and re- peatable performance install the flow meter using the recommended number of straight run pipe diameters upstream and downstream of the sensor.

Note: For liquid applications in vertical pipes, avoid installing with flow in the downward direction because the pipe may not be full at all points. Choose to install the meter with flow in the upward direction if possible.

A

B

A

B

Flow meter

Example 1.

One 90°elbow before meter

C'	C	Flow meter
Example 4.	Flow conditioner
		(if used)
Reduction before meter

AB

C' C Flow meter

Flow conditioner (if used)

Example 2.

Two 90°elbows before meter in one plane

AB

C' C Flow meter

Example 5.	Flow conditioner
Expansion before meter	(if used)

AB

C' C Flow meter

Flow conditioner (if used)

Example 3.

Two 90°elbows before meter out of plane (if three 90°bends present, double recommended length)

A		B
C'	C	Flow meter

Flow conditioner (if used)

Example 6.

Regulator or valve partially closed before meter (If valve is always wide open, base length requirements on fitting directly preceding it)

		Minimum Required				Minimum Required
		Upstream Diameters				Downstream Diameters
		No Flow				No Flow	With Flow
		Conditioner	With Flow Conditioner			Conditioner	Conditioner
	Example	A	A	C	C´	B	B
	1	10 D	N/A	N/A	N/A	5 D	5 D
	2	15 D	10 D	5 D	5 D	5 D	5 D
	3	25 D	10 D	5 D	5 D	10 D	5 D
	4	10 D	10 D	5 D	5 D	5 D	5 D
	5	20 D	10 D	5 D	5 D	5 D	5 D
	6	25 D	10 D	5 D	5 D	10 D	5 D
		D = Internal diameter of channel. N/A = Not applicable
	Figure 2-1. Recommended Pipe Length Requirements for Installation, Series 240 and 241
2-2							IM-24-HP