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EMCO Orifice Plates Type ISB/2
with integrated Unit for RTJ Flanges

Principle:EMCO orifice plates are used as primary elements in flow measurement of liquid, gas and steam according to the differential pressure principle

Sizing of the product
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***

Images & drawings

Construction
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
1" - 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.
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.
Technical Data
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