A SPRING LOADED OVER PRESSURE PROTECTING DEVICE FOR HIGH PRESSURE, HIGH TEMPERATURE STEAM BOILERS

摘要

This invention relates to a mechanical over pressure protecting device for steam service in high pressure, high temperature pressure vessel, vented to atmosphere. This over pressure protecting device needs to comply the Indian Boiler Regulations and ASME Sec-l, Rules for construction of Power Boiler. The device operates during closing on a back pressure principle, that is, the force of trapped steam on the upper side of the holder is utilized to assist a spring of the device in forcing the closing element back down onto its seat. The over pressure protecting device designed for high pressure and high temperature up to 730oC. The intended applications are Separator, Super Heater and Hot Re-Heater applications. The materials used in over pressure protecting device are base stainless steel, seat Inconel Alloy and inlet neck Inconel alloy, which are to be integrated by dissimilar material welding.