Model 951, Orifice plates concentric-segmental-eccentric, Orifice bore calculations – Meriam 951 Orifice Plate User Manual
Page 2: Orifice plates & accutubes, Orifice bore plus or minus tolerances, Orifice bore vent or drain holes “g, Meriam model “a” orifice plate o.d, Line pipe size
Orifice Plates & Accutubes
Model 951
Orifice Plates
Concentric-Segmental-Eccentric
85
Orifice Bore Calculations
The Meriam Engineering Department will
calculate orifice bore sizes utilizing an inhouse
computer.
Bore calculations are based on the LK. Spink
precision bore calculations.
Tabulate your flow data and send it to Meriam
with your order for precise bore sizing.
Orifice Bore
Plus or Minus
Tolerances
Less Than .250”
.0003
.250” to .499”
.0004
.500” to 1.999”
.0005
2.000” to 3.999”
.0010
4.000” to 9.999”
.0020
10.000” to 19.999”
.0050
20.000” & up
.0100
Orifice Bore
Vent or Drain
Holes “G”
Less than 1.000”
None
1.000 to 3.500”
3
/
32
”
3.501 to 4.125”
1
/
8
”
4.126 to 5.000”
5
/
32
”
5.001 to 6.000”
3
/
16
”
6.001 to 6.750”
7
/
32
”
6.751 to 7.500”
¼”
7.501 to 8.375”
9
/
32
”
8.376 to 9.250”
5
/
16
”
9.251 to 10.000”
11
/
32
”
10.001 to 10.875”
3
/
8
”
10.876 to 11.625”
13
/
32
”
11.626 to 12.500”
7
/
16
”
12.501 to 13.250”
15
/
32
”
13.251” & larger
½”
Line Pipe
Size
½”
¾”
1” 1¼” 1½” 2”
2½”
3”
4”
5”
6”
8”
10”
12”
14”
16”
18”
20”
22”
24”
Meriam
Model
“A” Orifice Plate O.D.
951C15
125-150#
Series
1
7
/
8
” 2¼” 2
5
/
8
” 3” 3
3
/
8
” 4
1
/
8
” 4
7
/
8
” 5
3
/
8
” 6
7
/
8
” 7¾” 8¾”
11” 13
3
/
8
” 16
1
/
8
” 17¾” 20¼” 21
5
/
8
” 23
7
/
8
” 26” 28¼”
951B30
250# Series
300# Series
—
2
1
/
8
”
2
7
/
8
”
2
5
/
8
” 2
7
/
8
” 3¼” 3¾” 4
3
/
8
” 5
1
/
8
” 5
7
/
8
” 7
1
/
8
” 8½” 9
7
/
8
” 12
1
/
8
” 14¼” 16
5
/
8
” 19
1
/
8
” 21¼” 23½” 25¾” 27¾” 30½”
951B40
400# Series
2
1
/
8
” 2
5
/
8
” 2
7
/
8
” 3¼” 3¾” 4
3
/
8
” 5
1
/
8
” 5
7
/
8
”
7”
8
3
/
8
” 9¾”
12” 14
1
/
8
” 16½”
19” 21
1
/
8
” 23
3
/
8
” 25½” 27
5
/
8
” 30¼”
951B60
600# Series
2
1
/
8
” 2
5
/
8
” 2
7
/
8
” 3¼” 3¾” 4
3
/
8
” 5
1
/
8
” 5
7
/
8
” 7
5
/
8
” 9½” 10½” 12
5
/
8
” 15¾”
18” 19
3
/
8
” 22¼” 24
1
/
8
” 26
7
/
8
” 28
7
/
8
” 31
1
/
8
”
951B90
900# Series
2½” 2¾” 3
1
/
8
” 3½” 3
7
/
8
” 5
5
/
8
” 6½” 6
5
/
8
” 8
1
/
8
” 9¾” 11
3
/
8
” 14
1
/
8
” 17
1
/
8
” 19
5
/
8
” 20½” 22
5
/
8
” 25
1
/
8
” 27½” —
33”
951B150
1500# Series 2½” 2¾” 3
1
/
8
” 3½” 3
7
/
8
” 5
5
/
8
” 6½” 6
7
/
8
” 8¼” 10” 11
1
/
8
” 13
7
/
8
” 17
1
/
8
” 20½” 22¾” 25¼” 27¾” 29¾” —
35½”
Plate Thickness
‘E’ Meriam
STD
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
¼”
¼”
¼”
¼”
¼”
¼”
‘E’ AGA STD
—
—
—
—
—
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
¼”
¼”
¼”
3
/
8
”
3
/
8
”
3
/
8
”
3
/
8
”
3
/
8
”
‘E’ ISA STD
—
—
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
¼”
¼”
¼”
¼”
¼”
ASME
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
1
/
8
”
¼”
¼”
¼”
¼”
¼”
¼”
¼”
¼”
¼”
¼”
Tolerances for
Orifice Bore
Vent/Drain
Hole Diameter
Dimensions Table
Ordering Information
To order Meriam’s Model 951 orifice plates
custom-made to your specifications, please
contact your Meriam sales representative
with the following information:
• Flange Rating
• Line Size
• Bore Dimensions, if available
(if unknown, consult factory)