Pulp Paper & Logistics


BS&B SAFETY SYSTEMS 25 ANDRITZ


a solitary sheet of stainless steel in a domed configuration. Perforations around the perimeter to aid opening at the desired low set pressure are protected with gasket materials. In 2010, the company


improved on the design by altering the shape of the dome to a unique compound geometry that delivers even greater rigidity for high vacuum or vibration applications.


The knife gate valve is designed to prevent explosion propagation from one vessel to another through interconnected piping


Flame arrestors Despite its popularity, explosion vents will not work for every application. With venting, the combustion process will release a large ball of flame into the atmosphere for a few milliseconds. In such cases, flame arrestors


can be deployed that absorb the pressure wave, flame and at least some of the dust that would normally be ejected by a vented explosion.


combustion process to escape to the atmosphere and limiting the pressure generated inside the process equipment to calculated safe limits. For decades, explosion vents


have been designed using a ‘composite’ approach that sandwiches plastic film between more resistant stainless steel sheets with holes, or slots, cut into it. Over time, however, this type


of vent is prone to tears in the plastics film, which is the seal between the process conditions and the atmosphere. In addition, particulate and debris can build up in the holes and slots such that it can affect the functionality of the vent.


In 1990, BS&B Systems


patented the first single-section explosion vent, comprised of


Suppression equipment For processes where an explosion would ideally be prevented altogether, suppression systems are available that detect a


dust explosion in the first milliseconds and then signals extinguishing modules to release a flame quenching medium into the process equipment. A typical suppression system


consists of sensors and several explosion suppression “cannons,” which propel an extinguishing agent, such as sodium bicarbonate. Nitrogen is often used to provide the motive power. Regardless of the type and


combination of equipment installed, the appropriate solution for each application is a hands-on, collaborative endeavour. “There is always more than one way to achieve combustible dust safety,” says Brazier. “The expertise is in reviewing each option and arriving at a combination of technologies that is effective in meeting the owner/operator’s responsibilities under NFPA Standards.” More information from BS&B


Safety Systems, 7455 East 46th Street, Tulsa, Oklahoma 74145- 6379, USA. Tel: 1 918 622-5950. E-mail: sales@bsbsystems.com Website: www.bsbsystems.com.


A typical suppression system consists of sensors and several explosion suppression ‘cannons’ which propel an extinguishing agent, such as sodium bicarbonate, into the process equipment


November/December 2017


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