MANWAY GASKET COMPRESSION STOP

摘要

A system for preventing manway cover gasket over-compression utilizes machined surfaces on the top of eye bolt lugs on the side of a manway nozzle, machined compression stops on the periphery of the cover, and a specified distance between the top of the eye bolt lug and the manway nozzle edge to engage the stops at a predetermined amount of gasket compression. Force is distributed over an increased contact surface area between the manway cover and the bolt lugs to ensure that deformation occurs preferentially in the eye bolts before any other component in the manway cover system.

主权项

1. A manway cover system for a railway tank car, comprising:
a nozzle having a top edge defining an opening in the tank car; a manway cover received on the nozzle; a plurality of bolt lugs on a vertical side surface of the nozzle, each bolt lug having a top surface; a plurality of slots in a peripheral edge of the manway cover for receiving bolts to tighten the manway cover on the nozzle, each of the plurality of slots defined by two ears defining opposite sides of the respective slot; at least one projection extending downward from an edge of the manway cover having a horizontal bottom surface adapted to contact the top surface of at least one respective bolt lug; a plurality of bolts attached to respective bolt lugs in a pivoting relationship; and a gasket received between the nozzle and the manway cover; wherein the top surface of each of said plurality of bolt lugs is at the same distance from the top edge of the nozzle.