Orifice Fittings and Meter Runs


Orifice Fittings and Meter Runs | Burner Management and Ignition Systems | Digital Test Gauge | Remanufactured Equipment

MODEL "DC" Dual Chamber Orifice Fitting - Download PDF Version
The Canalta Dual Chamber Orifice Fitting is designed and constructed to allow for the orifice plate replacement or inspection under pressure without the interruption of the flow in the line.

The Canalta DC Orifice Fitting is a high quality, high accuracy orifice fitting manufactured in a wide selection of sizes and materials. These units are built to meet or exceed ASME and ANSI specifications as well as to comply with the requirements of the latest editions of AGA-3, ISO-5167and API-14.3. The fittings are available to meet the NACE MR-0175 specification. Stainless Steel internals are also available to meet extreme corrosive applications.
 

Orifice Plate Seal Assemblies
1. Type “K” Standard 2000 Edition Seal Assembly
This is the standard seal assembly supplied with all orifice fittings from sizes 2” through 8”. This unit is used with a 0.562” seal gap for fitting sizes 2” thru 6” and with a 0.688” seal gap for 8” fittings. The single downstream seal function offers superior sealing capability while reducing seal damage during insertion. Plate Seal bypass tested down to 1” water column. It is comprised of an elastomer seal and one stainless steel retainer ring. Exacting and repeatable concentricity is maintained with the metal-to-metal contact throughout the entire circumference of the orifice plate to the plate carrier mechanism.
2. Dual Ring Orifice Plate Seal Assembly
Canalta Dual Ring Orifice Place Seal Assembly offers you (The Customer) an alternative sealing device for those specific or unorthodox situations.

This assembly is primarily used to upgrade the .688” seal gap (1985 Edition) orifice fitting bodies to comply with the latest editions of AGA-3 and ISO-5167 but is also available for 0.562” gap fittings (2000 Edition) per customer request.

The seal assembly simply mounts into place in the existing plate carrier. It is comprised of a stainless steel plate holder, retainer ring and standard sized O-Ring seals which are available in a variety of compositions. A positive seal is established with the orifice plate and the seal surfaces of the orifice fitting body utilizing the “inner and outer O-Ring” design. Plate seal bypass tested down to 1” water column.

When ordering the Dual Ring Orifice Plate Seal Assembly please specify 0.688” seal gap (1985 Edition) or 0.562” plate seal gap (1991 / 2000 Edition).
3. Teflon Snap Seal
The Teflon Snap Seal Provides Positive Plate Sealing in the harshest of process environments. The two piece design snaps over the orifice plate without the use of metal clips or retainers. A specially designed recess absorbs the insertion pressures minimizing permanent compression and distortion.

The raised section adjacent to the recess creates a positive seal against the orifice plate preventing bypass leakage. These two unique design features enhance seal performance while extending the life expectancy of the seal assembly.
Soft Seat Details
This unique soft seat design is available at no extra charge. It enables a maintenance free bubble tight seal between upper and lower chambers. Standard size O-Ring seals are incorporated and available in a wide variety of compositions.

Specifications
Design Orifice Fittings supplied in Canada are built in accordance with the ABSA Quality Control
Program and have 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-5167
Body Materials SA216 WCB, SA352 LCC or A351 CF8M
Internal Parts AISI 4130 Carbon Steel, 316 or A351 CF8M Stainless Steel
ANSI Class and Sizes 2” through 16” 150 through 1500 ANSI Raised Face Flange
18” through 26” - 150 through 600 ANSI Raised Face Flange
All 600, 900 and 1500 Flanges are also available in RTJ Face Flange
All sizes and ratings available in:
Flangeneck Design (Welding Neck Upstream, Flange Downstream)
Flanged Both Ends
Welding Neck Both Ends
Internal Bore Sizes 40, 60, 80, 100, 120, 160 and Custom Sizes
Sealing Compounds Body and Seal Bar: HNBR O-Ring Standard, Gasket Optional
Shafts: Teflon Packing Standard, HNBR O-ring Optional
Inner Valve: Grease Seal Standard, HNBR O-Ring Optional
Orifice Plate Seals:
2000 Edition: Formed HNBR Seals Standard
Dual Ring Assembly: HNBR O-ring Standard
Snap Seal: Teflon
Line Bore I.D. Tolerance In conformance with AGA-3 and ISO-5167 Latest Editions
Eccentricity Repeatability In conformance with AGA-3 and ISO-5167 Latest Editions
Tap Connections Two ½" NPT per side standard, two ½ NPT additional per side optional (TT)
2" and 3" fitting sizes center bored to .375” inside diameter
4" and above fitting sizes center bored to .500” inside diameter
Tolerance: +/- 0.016"
Orifice Plate Seal Gap 2" through 6" = .562", 8" through 14" = .688", 16" through 20" = .813”, 24” and above = .875"
Operating Shaft Location Standard on left hand side on fitting sizes up to and including 16"
Dual operation on 20" and above
Operating Temperature Standard at -20 to 100 Deg. F, Optional -40 to 1200 Deg. F
Operating Position Vertical or Horizontal

Conformance
All fittings come standard with a documentation package including hydro-test, functional test, inner valve seal test, quality control inspection report 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 penetrate tests can be performed with the relative report submitted.

Third Party Inspection is available upon request
 
Reporting
An AGA 2000 inspection report is included with the purchase of every fitting. The documented tests 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
 
Special Features
All Dual Chamber Orifice Fittings come standard with HNBR O-ring seals both on the body and the seal bar. This feature eliminates nuisance gasket maintenance and clamping bar screw breakage while providing superior sealing capability. The O-Rings incorporated are standard shelf sizes and can be supplied in a wide variety of compositions. Gaskets can also be used when preferred or required.
  • The Equalizer Valve, Grease Gun and Bleeder Valve come as a standard in 316 SS providing extended life and reliability.
  • Eccentricity of the Orifice Plate Carrier is fully accessible and adjustable from the exterior of the Orifice Fitting. Tamper proof sealing is done on request.
  • The Orifice Fittings can be purchased as "fitting only" or complete with custom-built meter runs and flow conditioners.
  • Trade-in of earlier versions is welcomed and remanufactured fittings and meter runs are available.
  • An additional set of Tele-metering instrument taps are available on each side as an option.
Ordering Information
Warranty & Sales Terms and Conditions