Canalta
DBB Orifice Fitting
This brings the unmatched safety of double block and bleed functionality to the already exceptional quality and performance of the Canalta lineup of orifice fittings.
- Protection from high pressure & toxic flow media
- Accurate flow measurement
- Highest quality manufacturing
- Available as fitting only, retrofit or complete AGA-3 or ISO-5167 meter.
Take a closer look at the
DBB Orifice Fittings
Canalta DBB Orifice Fitting
Retrofitting Orifice Meter Installations
Pressure Gauges
Automatic Valve Latches
Soft Seat Valve Seal
HNBR O-ring Seals
Canalta DBB Orifice Fitting
The Canalta DBB Orifice Fitting brings the unmatched safety of double block and bleed functionality to the already exceptional quality and performance of the Canalta lineup of orifice fittings.
Two valves separate the operator from the flow line – no need to block in the meter run with multiple ball valves. With separate equalization and venting for the upper and middle chambers, toxic or high pressure emissions through the top, putting personnel in danger, are virtually impossible in the rare event of lower valve failure.
Designed after HSE HSG 253 Cat 2 Isolation, and built to meet or exceed ASME and ANSI specifications, as well as to comply with the latest editions of AGA-3 / API 14.3 or ISO 5167, the Canalta DBB Orifice Fitting provides accurate flow metering over a long service life and superior protection from high pressures and toxic flow media.Retrofitting Orifice Meter Installations
Retrofitting Orifice Meter Installations provides added safety without the added cost of full equipment replacement. The DBB’s middle section can be installed on any existing Canalta Dual Chamber Orifice Fitting, or custom fabricated for any Daniel® Senior® Orifice Fitting, bringing double block and bleed functionality to orifice meters already in place.Pressure Gauges
Pressure Gauges on the upper and middle chambers help the operator assess equipment status. Local pressure readout can indicate valve failure, vent blockages and other dangerous system malfunctions. For added protection, Canalta Gauge Pro blowout preventers are installed between each of the gauges and fitting body.Automatic Valve Latches
Automatic Valve Latches can be fitted to one or both of the valve operating shafts. Requiring a manual reset before the valve may be opened, this security accessory provides an added opportunity for safety assessment and operator awareness. The ability to padlock the latch also brings additional security to fiscal flow measurement applications.Soft Seat Valve Seal
The Soft Seat Valve Seal is available for all DBB Orifice Fitting models. Effective in all scenarios, this unique design enables a bubble-tight seal between the three chambers without the need for frequent valve lubrication. The specially machined seal channel helps prevent O-ring dislocation, and the O-ring seals incorporated are available in a wide variety of compositions. The DBB Orifice Fitting is also effective with standard grease seals.HNBR O-ring Seals
HNBR O-ring Seals on the body sections and seal bar come standard with all Canalta DBB Orifice Fittings. 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 are also available and can be used when preferred or required.Operations & Maintenance Guide
DBB Orifice Fitting
Learn how to operate and maintain the double block and bleed orifice fitting from Canalta.
- Orifice fittings supplied in Canada are built in accordance with the ABSA Quality Control Program.
- 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.
- A216 WCB, A216 WCC, A352 LCC, A358 CF8M, A995 Gr4A, A995 Gr6A, Custom
- AISI 4130 Carbon Steel, 316 or A351 CF8M Stainless Steel
- Duplex
- Super Duplex
- 2" through 12", 150 through 2500 ANSI raised face flange
- 14" through 16", 150 through 1500 ANSI raised face flange
- 18" through 30", 150 through 600 ANSI raised face flange
- 600, 900 and 1500 flanges also available in RTJ face flange
- Flangeneck design (weldneck U/S, flange D/S)
- Flange x Flange
- Weldneck both end
40, 60, 80, 100, 120, 160 and custom sizes
- 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 - 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
In conformance with AGA-3 Latest Edition and ISO-5167
In conformance with AGA-3 Latest Edition and ISO-5167
- 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”
- 2” through 6” = 0.562”, 8” through 14” = 0.688”, 16” through 20” = 0.813”
- 24” through 30” = 0.875"
- Dual operation standard all sizes and pressure ratings
Standard at -20° to 100° F, optional -40° to 1200° F
Vertical or horizontal