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On Flow Measurement F-0009

Required Straight Run to install flowmeters

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.