Description
EMCO orifice plates are used as primary elements in flow measurement of liquid, gas and steam according to the differential pressure principle
|
|
|
|
Design and calculation standards
|
ISO 5167, ASME MFC-3M, ISA RP 3.2, Shell Flow Meter Engineering Handbook, L. K. Spink, AGA no. 3
|
|
Sizes
|
2" - 20" according to ANSI B 16.36, 50 mm < D < 1000 mm according to ISO 5167 and 50 mm < D < 900 mm according to ASME MFC-3M.
|
|
Pressure rating
|
600 - 2500 lbs RTJ
|
|
Plate thickness
|
3 - 9 mm
|
|
Holder width
|
27 mm; * 28.5, ** 30 mm, *** 32 mm
|
|
β (d/D)
|
Preferred range 0,5 < β < 0,7 for highest accuracy.
|
|
Vent or drain hole
|
On request
|
|
Material
|
AISI 316, other on request
|
|
Bore
|
d > 12,5 mm
|
|
Mounting style
|
Between RTJ flanges according to ANSI B16.36, API, other standards on request.
|
|
Connection
|
Oval type or octagonal type
|
|
Orifice plate shapes
|
Square edge concentric, conical, 1/4 circle, segment
|
|
Handle
|
With name plate in AISI 316 with the following inscription : TAG no., serial no., pressure rating, inner pipe dia., bore, material.
|
|
|
|
|
Accuracy
|
+/- 0,6 % for β < 0,6 and equal to β for β values above 0,6
|
|
Pressure loss
|
Depending on β, for β equal to 0,6 : ca. 60 % of the differential pressure measured
|
|
Limits for Reynolds No
|
Re > 1260 x β2 D according to ISO 5167 2000 < Re < 108 according to ASME MFC-3M
|
Size |
600 lbs |
900 lbs |
1500 lbs |
2500 lbs |
|---|---|---|---|---|
|
1"
|
R16
|
|
R16
|
R18
|
|
1½"
|
R20
|
|
R20
|
R23
|
|
2"
|
R23
|
|
R24
|
R26
|
|
2½"
|
R26
|
|
R27
|
R28**
|
|
3"
|
R31
|
R31
|
R35
|
R32**
|
|
4"
|
R37
|
R37
|
R39
|
|
|
6"
|
R45
|
R45
|
R46*
|
|
|
8"
|
R49
|
R49
|
|
|
|
10"
|
R53
|
R53
|
|
|
|
12"
|
R57
|
R57
|
|
|
|
14"
|
R61
|
|
|
|
|
16"
|
R65***
|
|
|
|
|
18"
|
R69***
|
|
|
|
|
20"
|
R73***
|
|
|
|
