Dwyer OP - Manual

Series OP Orifice Plate Flow Meter
Specifications - Installation and Operating Instructions
Bulletin F-OP
INCLUDES RING GASKET
ADHERED TO FACES
1-1/4
(31.75)
BODY
(CARRIER RING)
ORIFICE PLATE
1/8 (3.18)
THICK TYPICAL
1/4˝ NPT PRESSURE FITTING
FLOW
HI
PRESSURE
LOW
PRESSURE
4-1/2
(114.3)
A
A
CL
CL
OD ID
SPECIFICATIONS
Service: For metering compatible liquids & gases.
Wetted Material: 304 SS, Buna-N gaskets.
Accuracy: 0.6% of full scale flow. (Beta = .2-.6) ±0.7% for Beta
greater than .6.
Temperature: -50 to 200°F (-45 to 93°C).
Pressure: Limited only by pipe and flange rating restrictions.
Head Loss: 1-Beta ratio
2 eg: 1-0.7 2 or 1-0.49 = 51% of the d.p.
Line Sizes: 1/2˝ to 24˝.
Process Connection: 1/4˝ female NPT.
Installation: Standard flange, any rating (orifice flanges not required).
Pipe Requirements: General requirements 10 diameter upstream
and 5 diameter downstream of orifice plate.
Weight: Varies with line size. See chart.
The Series OP Orifice Plate Flow Meter is a complete orifice
plate flow metering package. It incorporates a stainless steel
orifice plate with a unique holder or carrier ring containing metering
taps and integral gaskets. It was designed for use wherever there
is an application for a conventional flow orifice plate. It can also be
used in place of other primary differential producers for efficiency
and cost effectiveness. Installation is accomplished simply by
slipping the unit between standard flanges (orifice flanges are not
required). The Series OP is available in line sizes from 1/2˝ to 24˝
and can be used with compatible liquids and gases.
ACCURACY
The Series OP utilizes the corner tap proportions as defined in ISO
5167. While this code may not be referred to as International
Standard until accepted by the ISO Council, the ASME Fluid
Meters Research Committee has suggested that the
dimensionless coefficient equation developed by the International
Standards Organization (ISO) and presented in ISO 5167 is
significantly better for the broad spectrum of flow measurement
applications throughout process industries.
The coefficient values used in the Series OP bore calculations
represent the same confidence level assigned to the flange and
radius taps widely accepted in fluid flow measurement.
The accuracy assigned to the coefficient values is ±0.6% full scale
flow for d/D (Beta) values 0.2 to 0.6 and ±0.7% for Beta values 0.7
to 0.75 (i.e. ß of 0.7 would have an uncertainty value of ±0.7% full
scale flow).
Accuracy of the differential signal produced by the Series OP
equals or exceeds that of a properly manufactured and installed
flange or radius tap orifice meter.
MOUNTING
The orifice metering primary shall be suitable for installation
between standard ANSI 125/150# flanges (any material) mounted
on standard pipe (any material). The unit shall be "self centering"
within the bolt circle of the flanges. No alignment of the orifice shall
be necessary unless used with 300# or non-standard flange
ratings. Drilling and or tapping of the main or flanges will not be
allowed or required. The overall laying length shall be 1.25˝
including pre-attached ring type 1/8˝ thick Buna "N" Gaskets.
Pipe Requirements: Upstream and downstream pipe
requirements are contingent upon two factors: (a) Beta Ratio-ratio
of the orifice bore to the pipe I.D. (d/D); (b) The type of fitting or
disturbance upstream of the Series OP. For most applications, 10
pipe dia. upstream & 5 dia. downstream are sufficient. (5 pipe dia.
up and 2 dia. down are acceptable for non-critical application.)
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
F-OP bulletin:F-OP bulletin 7/24/09 10:06 AM Page 1