FOWTECH make
ORIFICE FLANGE ASSEMBLIES are used for measuring
flow of various Liquids, Gases & Steam from
1 ½” to 24” line sizes. It gives an acceptable
level of uncertainties at lowest cost and long life without
regular maintenances. Orifice Plates are most commonly used
as primary element for flow measurement in pipelines based upon
the principle of measurement of ‘Differential Pressure’
created when an obstruction is placed in the fluid flow, due
to increase in fluid velocity.
DESIGN STANDARDS
DESIGN
Confirming
to ISA RP 3.2, DN 1952, BS 1042, ISO-5167
ORIFICE
BORE
Confirming to ISO
5167 / BS 1042 / RW Miller / L. K. SPINK / AGE –
3
ACCURACY
Within +/- 1 %
VENT / DRAIN
Vent OR Drain holes
are provided as per customer’s requirement. Not
drilled for Orifice Bore smaller than 25.4
mm.
ORIFICE FLANGE ASSEMBLY COMPONENTS
MAIN LINE ORIFICE
PLATE : -There are various
types of Orifice Plates.
(A)
SQUARE EDGED CONCENTRIC: -
(B)
ECCENTRIC: -
These are
commonly used for Flow Measurement. Its main features
are simple structure, high accuracy & ease of installation
& replacement. These are used for clean liquids, Gases
& Steam applications when the Reynolds number ranges
from 10,000 to 1, 00, 00,000.
These are commonly used
for Liquids containing solid particles that are likely
to sediment OR for vapors likely to deposit water condensate.
This Orifice Plate is used with its eccentric bore bottom
flush with the bottom of the piping inside surface so
that the sedimentation of such inclusions can be avoided.
Similarly for Gases OR vapors it may be installed with
its eccentric bore flush with the
(C)
SEGMENTAL: -
(D)
QUADRANT EDGE: -
These are commonly used for
measurements where solids are
entrained in a gas OR liquid flow stream
as the bore of this Orifice Plate is a
semicircle.
These are principally used for measuring
of low Reynolds number
(i.e. between 2,000 to 10,000) as the inlet edge of
the bore of this Orifice Plate is rounded to a quarter
circle.
(E)
CONICAL ENTRANCE :-
These are principally
used for measuring of viscous fluids where the Reynolds
number is very low (i.e. between 80 to 2,000)
PRESSURE
TAPPINGS : - There
are three types of Pressure Tappings are used.
CORNER TAPPING:
- These are mainly used for line sizes from 1 ½”
to 12”.
FLANGE TAPPING: - These are mainly used for line sizes
from 2” to 20”. D & D/2 TAPPING:
- These are mainly used for line sizes from 20”
TO 24”.
GASKETS,
STUDS, NUTS & JACK SCREW : - For
details please refer the Material of Construction section.
Orifice
Plate
316SS, 304SS, P.P.
Orifice Flange
M.S., 316SS, P.P.
Carrier Ring
M.S.,
316SS, P.P.
Gasket
CAF as per IS: 2712
Gr.0/1, SS Spiral Wound + CAF, SS Spiral Wound + Grafoil,
SS Spiral Wound + PTFE as standard. Other materials available
on request.
Studs
ASTM A193 Gr.87/A-104
Gr.2H as standard. Other materials available on request.
Nuts
ASTM A193 Gr.87/A-104
Gr.2H as standard. Other materials available on request.
