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To obtain specified accuracy, straight run both for upstream and downstream is needed. The required straight run is depeding on the type of flowmeter.
The recommended straight run by type is shown below.
Type of Flowmeter |
Tokyo Keiso Model |
Required straight run | Remarks | ||
---|---|---|---|---|---|
Upstream | Downstream | ||||
Variable Area Flowmeter |
R-100 AC AM-1000 M A P etc. |
Not required |
Not required |
Turbulence in large size flowmeter may result unstable float movementr. | |
Magnetic Flowmeter |
MAGMAX Series | 5D* | 2D | Flow control valves are to be located downstream, if any. | |
Ultrasonic Flowmeter |
UCUF | Not required | Not required |
Flow control valves are to be located downstream, if any. | |
UL320 UL610P UL3030K |
10D | 5D | |||
DP type Flowmeter |
Orifice type | O-010 O-100 O-1000 O-180(780) |
20D | 10D | --- |
Pitot Tube type | HDT CFW-1000, 2000 CDT |
--- | |||
V Cone Flowmeter | VC,VD,VM | Not required | 3D | 2D upstream and 5D downstream is recommended in case that valve and other fittings than elbows are located. | |
Vortex Flowmeter |
VF-2000 VF-2200 VF-2300 VF-3000 VF-4000 VF-5000 KARUMAN ACE |
10D | 5D | Flow control valves are to be located downstream, if any. | |
Wheel type Flowmeter |
W-100 W-200 W-300 W-400 W-800 W-2000 W-3000 MU-1000 TW-070 TW-080 TW-090 TW-100 |
Not required | Not required |
The inner diameter of the process piping is to be larger than the flowmeter's diameter. | |
W-500 WX-2000 |
20D | 5D | Flow control valves are to be located downstream, if any. | ||
Corioli Force Mass flowmeter |
MASSMAX7000 MASSMAX7100 |
Not required | Not required |
--- | |
Thermal Mass flowmeter/ Conroller |
TF TC HM |
Not required | Not required |
5D both upstream and downstream for type TF-1150,A1250,A1251, A1551,A2251. 5D upstream 0D for downstream for TF-2421 to 2441. |
|
Thermal flowmeter |
TH | 20D* | 5D | 3D upstream 0D for downstream for TH-1600 and TH-1800 with flow strainer. |
D: Inside diameter of piping. (5D: 5 times of Inside diameter of piping)
* | Recommended straight run in the table is subject to the condition that one 90 deg elbow is located upstream. Double elbows, pumps and valves upstream may require further straight run. |
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