Orifice flange assembly_F500

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Orifice flange assembly_F500

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Detailed Introduction


Orifice flange assembly is used in conjunction with orifice plate for flow measurement of smaller or medium size pipes at lower or medium pressure ranges. The flange connection is a RF type and the differential pressure tapping system is the flange taps.


Flange mounting type Welding neck Slip-on Socket-weld
Ring-joint welding neck
Nominal diameter 25 ~ 600 mm
1" ~ 24"
Flange ratings JIS 10, 20, 30, 40 and 63 K
ANSI (or JPI) 150, 300, 600 and 900 Lb RF
Flange material A105, A182-F304, A182-F316, A182-F11, A182-F22 and A350-LF2
Materials of bolts and nuts Stud blots : SNB7, A193-B7 and A194-B8
Nuts : S45C, A194-2H and A194-8 Jack bolts and nuts : S25C and A307
Gasket Thickness : 4.5 mm
Material : Spiral wound gaskets
Piping connection method ANSI 150 Lb : Insertion welding type (Slip-on type)
ANSI 300, 600 Lb : Butt welding type (Welding neck)
ANSI 900 Lb : Butt welding neck (Ring-joint WN)
Differential pressure piping connection Select referring to the model number construction table
Orifice bore type Concentric square edged orifice
Quadrant edged orifice
Eccentric orifice
Segmental orifice
Flow claculation standards ISO 5167-1 and 2 2003 AGA-3
ASME MFC-3M (R.W Miller)
L.K. Spink JIS Z 8762
Plate thickness 3,6,9 and 12 mm
Tab handle Welded to orifice plate
Plate material Standard : 304SS and 316L SS
Non-standard : Monel, Hastelloy B/C, Titanium etc.
Drain and vent hole Per ASME recommendations
Not drilled for orifice bores smaller than 25.4 mm
Markings Upstream side of tab handle stamped "Upstream" and with bore type and size, line size, tag number and flange rating
Special markings Special marking may be furnished to meet special requirement


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