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Protection by Deflagration Venting establishes requirements for the design, location, installation, maintenance, and use of devices and systems that vent the combustion gases and pressures resulting from a deflagration within an enclosure so that structural and mechanical damage is minimized. EN Standards EN14491 and EN14797 provide similar
direction to the user of explosion vents, while the NFPA Standard provides useful direction with respect to periodic inspection.
COMPOSITE VENTS
The composite vent design was introduced by BS&B Safety Systems more than 50 years ago and marked a milestone in the achievement of low-set pressure from relatively thick sheet metal. In the three-part sandwich construction, the outlet section controls the opening pressure, while the inlet section protects the fragile plastic film and provides a predetermined degree of vacuum resistance. Composite vents can be either flat or domed, with domed vents being recommended for vacuum service, particularly cyclic vacuum service. Single Section Vents: As the demand for explosion
protection technology grew, BS&B later developed the single section vent. In this design, a single sheet of metal is intermittently cut about its perimeter and gaskets are applied to cover the cut pattern. Eliminating the fragile
plastic film seal and one sheet of metal reduces the mass of an explosion vent, making it more efficient at responding to the rapid rate of pressure arising. By engineering the single section vent with a domed shape, the design allows the explosion vent to handle even high vacuum operating conditions and cyclical operating pressure conditions. It also eliminates product build-up, enabling use in clean service applications. Single Section Compound Domes: In 2010, BS&B
improved on the single section vent design by altering the shape of the dome to a unique compound geometry. This advance was born out of a desire to increase the vacuum resistance of the vents, without increasing the weight. The purpose of a domed construction is to provide greater intrinsic vacuum resistance. This is important, as powder and bulk solid storage, pneumatic conveying and dust collection systems often operate under cyclic vacuum conditions. Applications for Composite Vents: While single section explosion vents offer the best solution for most applications, there are some exceptions where composite vent technology provides the best performance. In particular, this is for applications that utilize combustion systems with hot exhaust gases.
The BS&B patented HTV vent has internal thermal insulation that allows for service conditions in excess of 1000 degrees Fahrenheit / 540 degrees Centigrade.
COMPANY INFORMATION
BS&B Safety Systems manufacture a broad range of dust explosion prevention and protection technologies. Manufacturing facilities operate and test according to national and international standards and codes, including NFPA 68, NFPA 69, EN 14491 and EN 14797.
bsbsystems.com
sales@bsbsystems.com
sales@bsbipd.com
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