The Single Chamber Orifice Fitting is designed and constructed to allow for ease of orifice plate replacement or inspection after depressurization.
All fittings come standard with a documentation package including hydro-test, function test, inner valve seal test, quality control inspection and material test reports. Trace ability is maintained in accordance with the ISO-9001 Quality Control Program. The fittings are manufactured within the guidelines of ASME 16.34 and ASME 16.5. When required, radiography, stress relief, ultra-sonic and liquid dye penetration tests can be performed with the relevant report submitted.
Single Chamber Orifice Fitting models 8” and larger incorporate a rack and pinion gear system to manage the sizeable weight of large orifice plates and carriers. With this system, plate changing remains quick and easy. These models also feature fully accessible and adjustable eccentricity of the orifice plate from the exterior of the fitting. Tamper-proof sealing is done on request.
All Single Chamber Orifice Fittings come standard with HNBR O-ring seals on the seal bar. This feature provides you with superior sealing capability while eliminating nuisance gasket maintenance and clamping bar screw breakage. The O-rings incorporated are standard shelf sizes and can be supplied in a wide variety of compositions. Gaskets are also available and can be used when preferred or required.
Technical Specifications
Design
- Orifice fittings supplied in Canada are built in accordance with the ABSA Quality Control Program and carry a CRN registration number.
- Industry Canada Approval Number AF-0014.
- In compliance with ASME 16.34 and ASME 16.5, ASTM specifications, AGA-3 Latest Edition and ISO-516.
Body Materials
SA216 WCB, SA352 LCC or A351 CF8M
Internal Parts
AISI 4130 Carbon Steel, 316 or A351 CF8M Stainless Steel
Sizes and ANSI Class
- 2” through 24”, 150 through 1500 ANSI raised face flange
- 600, 900 and 1500 flanges also available in RTJ face flange
U/S D/S Connections
- Flangeneck design (weldneck U/S, flange D/S)
- Flange x Flange
- Weldneck both end
Internal Bore Size
40, 60, 80, 100, 120, 160 and custom sizes
Sealing Compounds
- Seal bar - HNBR O-ring standard, gasket optional
- Orifice plate - Type “K” 2000 Edition formed HNBR seal on a 316 SS retainer ring
- Dual Ring HNBR O-rings standard on a 316 SS retainer ring assembly
- Teflon Snap Seal two-piece virgin Teflon assembly
Line Bore I.D. Tolerance
In conformance with AGA-3 and ISO-5167 Latest Edition
Eccentricity Repeatability
In conformance with AGA-3 and ISO-5167 Latest Edition
Tap Connections
- Two 1/2” NPT per side standard, two 1/2” NPT additional per side optional (TT)
- 2” and 3” fitting sizes center bored to .375” inside diameter
- 4” and larger sizes center bored to .500” inside diameter
- Tolerance +/- 1/64”
Orifice Plate Seal Gap
- 2” through 6” = 0.562”, 8” through 14” = 0.688”, 16” through 20” = 0.813”
- 24” through 30” = 0.875
Operating Shaft Location
- Shafts are a feature only on fitting sizes 8" and larger
- Left hand mount standard on sizes 8” through 16”
- Dual operation on sizes 20” and larger
Operating Temperature
Standard at -20° to 100°F, optional -40° to 1200°F
Operating Positions
- Vertical or horizontal
- Reporting
An AGA 2000 Inspection report is included with the purchase of every fitting. The documented test include:
- I.D. Bore Tolerance
- Tap Communication
- Orifice Eccentricity
- Instrument Tap Diameter
- Plate Seal Test
- Bore Inside Diameter
- Instrument Tap Location
- Seal Protrusion
- Bore Roughness