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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
Upstrea
m

Remarks

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.

10D

5D

20D

10D

UL320
UL610P
UL3030K
DP type
Flowmeter

Vortex
Flowmeter

Orifice type

O-010
O-100
O-1000
O-180(780)

Pitot
Tube type

HDT
CFW-1000,
2000
CDT

V Cone
Flowmete
r

VC,VD,VM

VF-2000
VF-2200
VF-2300
VF-3000
VF-4000

---

---

Not required

3D

2D upstream and 5D
downstream is recommended
in case that valve and other
fittings than elbows are
located.

10D

5D

Flow control valves are to be
located downstream, if any.

Thermal flowmeter TH 20D* 5D 3D upstream 0D for downstream for TH-1600 and TH-1800 with flow strainer. (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.A2251. pumps and valves upstream may require further straight run. D: Inside diameter of piping.A1251. 20D 5D Flow control valves are to be located downstream. A1551.A1250.VF-5000 KARUMAN ACE 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 W-500 WX-2000 Not required Not required The inner diameter of the process piping is to be larger than the flowmeter's diameter. Double elbows. if any. . 5D upstream 0D for downstream for TF-2421 to 2441. 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.