A special feature by BD Diesel Performance relating to Positive Air Shutdown (PAS) devices.
As of January 12th of this year, diesel engines being used during loading or off-loading on highway tanks and portable tanks containing dangerous good of Class 2.1, Class 3, or, subsidiary Class 3 must be equipped with an automatic engine air intake shut off device to prevent engine runaway, as per Transport Canada regulations CSA B621-14 (clause 7.1.j) and B622-14 (clause 5.1.i).
The reason for this is that when diesel engines are exposed to airborne flammable vapours, there is a high probability that the vapours will enter through the air intake causing the engine to overspeed (or runaway) as well as causing potential backfire. Because the vapours also act as an uncontrolled source of fuel, trying to turn off engine through conventional methods will not work.
The only effective way to stop an engine from running away in these cases is to shut off the air supply thus eliminating the vapours and the oxygen needed for combustion. BD Diesel Performance has become the premier supplier for air intake shutdown systems and offers a range of units to fit a variety of equipment, vehicles and highway rigs.
The Positive Air Shutdown, or PAS, is an inline butterfly valve that mounts in the air intake system and will automatically detect engine overspeed which will trip a locked safety cam causing the valve to close off, blocking air supply and shutting down the engine within seconds. When the vapours have been cleared or equipment has been removed from the area, the valve can be locked back into the open position and the engine can be started up again. These kits are available for 2.5 to 4 inch sized intake piping.
The Electronic Positive Air Shutdown, E-PAS, work much the same way as the PAS but electronically controls the existing factory intake air control valve on newer Chevy/GMC, Dodge and Ford diesel pickups and uses it to shut off the air supply in an overspeed condition. These units easily install by plugging into factory plugs and are just as easy to remove when returning leased trucks.
There are a number of other regulatory boards and government agencies dealing with industries such as oil refinery and septic/sewer evacuation that also have requirements for air intake shut off devices which the BD line of Positive Air Shutdown kits can handily meet.
BD Diesel Performance is unique among its peers as they design, create, manufacture, remanufacture and distribute a wide range of products specifically engineered for performance Diesel powered applications, all done in house. Located in Abbotsford, British Columbia, Canada, BD’s state-of-the-art facilities cover 65,000 square feet, and employ 120 plus highly-trained individuals.
BD’s turbocharger division is an authorized distributor of Borg Warner, Holset, Garett and other turbocharger lines and has a full fledge remanufacture shop that offers fast turnaround service of reliably built units. They also have a huge inventory of turbos on their shelves for quick exchange and offer injectors for common Cummins, CAT and Detroit engines.
BD is also a well-known name across North America with products for diesel powered pick-ups such as performance turbo kits, fuel injection systems, transmissions, suspension, exhaust manifolds, electronic throttle controls and much more. Check out their website at www.dieselperformance.com or give them a call at 800.887.5030 for more information.

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