We are Manufacturer, Supplier, Exporter, Services Provider of Emergency Vents and our setup is situated in Pune, Maharashtra, India. The Emergency Vent (Figure 4210) is an economical solution to the present day emergency venting requirements. It is not intended as protection against an internal explosion, but to prevent excessive vapour pressure rise in the event of an external fire. It is available for use in normal, chemical or low temperature service. For lightly loaded vents, the entire hinged cover may be lifted open, providing a convenient inspection or access point through the unobstructed opening. Since unbolting and gasket replacement are unnecessary, the time saving alone is often sufficient to justify the use of this design of vent.
Emergency Vent is available in 250 mm (10”) and 500 mm (20”) sizes with flat face flanges to match a 10” ASA Class 125 and a 20” API Roof Manhole respectively. For normal service Applications, the steel manhole base has a weld deposited stainless steel seat facing and is fitted with a neoprene ‘Tite’ seal diaphragm. For chemical/low temperature service Applications, the manhole base is of stainless steel Construction and a PTFE coated glass cloth ‘Tite’ seal diaphragm completely covers the underside of the hinged cover.
250 mm (10”) Minimum set pressure with alum. pallet = 84 m m (3.3”) W.G. Minimum set pressure with steel pallet = 165 m m (6.5”) W.G. Maximum set pressure with alum. pallet = 1435 mm (56.5”) W.G. Maximum set pressure with steel pallet = 1516 mm (59.7”) W.G. 500 mm (20”) Minimum set pressure with alum. pallet = 51 m m (2.0”) W.G. Minimum set pressure with steel pallet = 112 m m (4.4”) W.G. Maximum set pressure with alum. pallet = 640 m m (25.2”) W.G. Maximum set pressure with steel pallet = 701 m m (27.6”) W.G.
When set pressure is reached, the pallet starts to lift and flow efficiency rises rapidly to approximately 60% of a perfect orifice when tank pressure is 40% in excess of the set pressure.
At higher overpressure the flow efficiency can reach 75%. Where 40% overpressure cannot be tolerated. Flow capacity formulae have been estimated for 30%, 20% overpressure.