SAE J1928:2020 pdf free

SAE J1928:2020 pdf free.Devices Providing Backfire Flame Control for Gasoline Engines in Marine Applications
The backfire flame arrester assembly and carburetor or throttle body, or induction system shall be attached to the test stand in Figure 1 in a manner simulating a normal installation. An engine may be used in place of the test stand for testing induction systems (see 5.4.5.2.3). Prior to the tests, the carburetor, throttle body, or induction system shall be carefully checked for any openings that could permit flame passage, and all throttle and choke butterflies shall be locked in the full open position. Fuel line, vacuum advance, and other carburetor, throttle body, or induction system openings shall be plugged.
Using whatever adaptor that may be required, the carburetor or throttle body with the attached backfire flame arrester assembly or the induction system shall be secured directly to the upper end of a chamber, to be referred to as the lower chamber with an internal bore of 51 mm (2 inches) and a length of 61 cm (24 inches). The lower chamber shall be closed at the lower end. See Figure 1. The method of attachment shall be that all joints are gas-tight, and the carburetor, throttle body, or induction system is directly and fully open to the lower chamber with no restriction to gas flow. For evaluation of induction systems an engine can be used in place of the lower chamber, with alterations to introduce the combustible mixture and ignition source.
The propane/air explosive mixture used for these tests shall be generated through the use of flow meters and a suitable premixing chamber so designed and arranged that a controlled homogeneous explosive mixture is fed up to the lower chamber for a flame arrester and to the upper and lower chamber for air induction system during all tests. A suitable control valve shall be provided at the gas/air inlet ftting to permit immediate extinguishment of the mixture, should it continue to burn after ignition. Flame arresters shall be provided in all connecting fttings between the explosion chamber and mixing chamber to prevent effective flame propagation through the lines to the mixing chamber.SAE J1928 pdf free download.