Explosion relief vent for cover of drying centrifuge etc. - carries pressure wave through flexible sleeve to exhaust duct

摘要

A machine, partic. a drying centrifuge, has a processing chamber with access port closed by a cover. The improvement is that the cover has a pressure relief aperture leading into a connecting sleeve which joins into an exhaust duct. The cross sectional areas of the aperture, sleeve and duct are all sufficiently great to ensure that any explosion in the vessel is relieved before the chamber pressure can rise to a level which would damage the chamber or ancillary equipment. The sleeve is pref. made of a deformable material, partic. in pleated concertina formation. A bursting disc is pref. fitted somewhere between the access port and the outlet end of the exhaust duct. When the chamber or cover is provided with an observation port, a remotely controlled, closed circuit television camera is pref. used for viewing through the port window. Used to vent explosions to atmos. before pressure can damage the equipment. Partic. applicable to the safety covers or operator guards which now have to be fitted over the access ports of vertical axis centrifugal dryers. Chamber pressure is restricted to a predetermined safe value. The new type of cover can be rapidly and inexpensively fitted to existing plant.