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Dual Chamber Orifice Fitting

With input from engineering firms, measurement specialists and field personnel, TMCO has strengthened the advantages of orifice metering by implementing features that improve the performance of your meter runs, simplify your operations, reduce maintenance costs and keep your people safe in the field.

The SureShot® Dual Chamber is TMCO’s flagship fitting. Customer-driven design features ensure safe, cost-effective, and operationally excellent solutions to the most demanding gas measurement challenges.


SureShot® Dual Chamber Orifice fittings fully conform to the latest AGA 3/API 14.3 stringent requirements. They require no added uncertainty and provide accurate performance over the orifice plate beta ratio range from 0.1 to 0.75 within 0.5% flow accuracy to theoretical value.

Design Features

Isolating Eccentric Plug Valve Assembly &
Removable End Caps

This patented differentiator ensures overall Lower Cost of Ownership – fewer parts, easier and cleaner maintenance routines, heightened operator safety, less uncertainty of measurement.

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Safety Device and SureLock™
Lock Out/Tag Out

Key safety features of the TMCO fitting keep operators safe in the field:

Orifice Plate Carrier

Accuracy features of the TMCO orifice plate carrier increase revenues and eliminate revenue
loss by providing secured and repeatable plate positioning and reduced seal ring

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Orifice-Plate-Carrier1 Orifice-Plate-Carrier2

SureShot® Dual Chamber Specification List

  • 2, 3, 4, 6, 8, 10, 12, 16
  • ANSI Class 150 (285 PSI CWP)
  • ANSI Class 300 (740 PSI CWP)
  • ANSI Class 600 (1480 PSI CWP)
  • ANSI Class 900 ( 2160 PSI CWP) (3” only)
  • A-216 WCB/WCC
  • Consult factory for options
  • -20°F to 275°F (-29°C to 120°C)

  • ANSI Class 150 to ANSI Class 600 inclusive
  • Weld x Flange; Flange x Flange; Raised Face, Ring Type Joint (RTJ)
  • AGA 3/API 14.3, ISO-5167
  • ANSI B31.3, ANSI B16.5; MS SP-55
  • NACE MR-01-75-2000
  • Hydrostatic test 1-1/2 times rated CWP.
  • Tested for positive plate seal, pressure tap integrity, seal protrusion and eccentricity

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