|
|
To obtain specified accuracy, straight run both for upstream and downstream
is needed. The required straight run is depding on the type of flowmeter.
The recommended straight run by types 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. |
UL600N
UL610P
UL500K |
10D |
5D |
|
DP type Flowmeter |
Orifice type |
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-1000
VF-2000
VF-2200
VF-3000
VF-4000
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 |
Not required |
Not required |
5D both upstream and downstream for type
TF-1150,A1250,A1251,A1551,A2251.
5D upstream 0D for downstream for
TF-2421~2441.
|
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 |
5D both upstream and downstream for type
TF-1150,A1250,A1251,A1551,A2251.
5D upstream 0D for downstream for
TF-2421~2441.
|
| 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-2421~2441.
|
|
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.
|
|
Copyright 1998-2003 TOKYO KEISO CO.,LTD. All rights reserved.
 |
