Rosemount 1495 - Recommended Straight Run Requirements; Iso 5167-2

Reference Manual
00809-0100-4792, Rev CA
August 2010
Rosemount 1495, 1496
www.rosemount.com
Appendix B Recommended Installation
Requirements
Recommended Straight Run Requirements . . . . . . . . . . . page B-1
Bolt Torque Recommendations . . . . . . . . . . . . . . . . . . . . . page B-12
RECOMMENDED
STRAIGHT RUN
REQUIREMENTS
ISO 5167-2 International Standard
First Edition
March 1, 2003
Measurement of fluid flow by means of pressure differential devices inserted
in circular-cross section conduits running full - Part 2: Orifice Plates
Table B-1. Required straight run lengths between orifice plates and fittings without flow conditioners.
Values expressed as multiples of internal diameter, D
Diameter
Ratio,
Upstream (inlet) side of orifice plate
Single 90°
bend
Two 90°
bends in
any plane
Two 90° bends
in the same
plane:
S-configuration
Two 90° bends
in the same
plane:
S-configuration
Two 90° bends
in perpendicular
planes
Two 90°
bends in
perpendicular
planes
Single 90° tee
with or without
an extension
Mitre 90° bend
Single 45° bend
Two 45° bends in
the same plane:
S-configuration
1 2 3 4 5 6 7 8
-- A
e
B
f
A
e
B
f
A
e
B
f
A
e
B
f
A
e
B
f
A
e
B
f
A
e
B
f
0.20 6 3 10
g
10
g
19 18 34 17 3 g 7
g
0.40 16 3 10
g
10
g
44 18 50 25 9 3 30 9
0.50 22 9 18 10 22 10 44 18 75 34 19 9 30 18
0.60 42 13 30 18 42 18 44 18 65 25 29 18 30 18
0.67 44 20 44 18 44 20 44 20 60 18 36 18 44 18
0.75 44 20 44 18 44 22 44 20 75 18 44 18 44 18

30D S 10D
a
10D S
a
5D S
ab
S2D
a
S30D
a