FLOW
Flow Body
F1
F2
F3
F4
FLOW AND ENERGY MEASUREMENT
Upstream obstruction
Minimum straight run required upstream of flow meter process connection based
on the nature of the upstream obstruction
¾"
1"
1 ¼"
1 ½"
2"
2 ½"
3"
4"
6"
Single bend preceded by ≥ 9 diameters
of straight pipe OR Pipe size reduction in
straight pipe run
2.25"
3"
3.75"
4.5"
6"
7.5"
9"
12"
18"
Multiple bends in plane with < 9
diameters of straight pupe between them
OR Pipe size expansion in straight run
6.75"
9"
11.25"
13.5"
18"
22.5"
27"
36"
54"
Tees
7.5"
10"
12.5"
15"
20"
25"
30"
40"
60"
Multiple bends out of plane
7.5"
10"
12.5"
15"
20"
25"
30"
40"
60"
Modulating or regulating valves OR
Diaphram or roots type utility meters
9"
12"
15"
18"
24"
30"
36"
48"
72"
Minimum downstream straight run required after flow meter process connection
2.25"
3"
3.75"
4.5"
6"
7.5"
9"
12"
18"
i
Model F-5500
INST
ALL
A
TION
11451 Belcher Road South, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax +1 (727) 442-5699 • [email protected]
F-5500 Thermal Mass Flow Meter Manual 06/17 - 2030 / 107023
Page 27
Fig. 2.11: Straight Run Requirements for Upstream Obstructions - Inline
Upstream
Obstructions
Flow Body
Orientation
Inline Type
Inline Orientation
Install the flow body so that the flow indicator is pointing in the direction of flow.
Fig. 2.12: Orientation of an Inline Meter - Flow Direction Indicator
Installation: Inline Type
NOTE: ONICON does not supply gaskets for this product.
