Pressure Relief Clause Samples
Pressure Relief. Over-pressure protection shall be supplied by rupture discs and/or relief valves. Any relief valve in brine service must be installed with a rupture disk below the relief valve to protect the valve from scaling. A “witness” method, such as a ½” vent pipe with a ball valve, must be provided to allow a failed rupture disc to be detected. Pressure relief devices must be piped to a sump or a safe location. All piping upstream of the power plant inlet valve shall be protected by relief valves on the individual production pipelines. Piping downstream of the power plant shall be protected by relief valves set to the design pressure of the pipeline to be determined by the Owner’s Engineer. If the injection pumps are not operating, the production pipeline relief valves can be included in the pressure relief design of the injection pipeline.
Pressure Relief. There is no guaranteed or warranted method for relieving the pressure from a methacrylic acid runaway reaction and the consequent potential of violent rupture of the container. Therefore, low design pressure (API atmospheric) tanks are recommended. Although no detailed experience with runaway reactions in full size tanks is available, weak seam or frangible roof designs are believed to provide the best protection from a failure. Roof guide cables should be considered to control the trajectory of such a roof. In addition, oversized rupture disks or weight- For the natural breathing of the tank, a conservation valve should always be installed. Various designs such as weight-loaded pressure pallet valves or breathing valves with flexible diaphragms are commercially available. Seal pots with glycol can be used instead of conservation vents if they are properly designed and maintained. They may also serve as an overflow device. Uninhibited methacrylic acid vapor can condense or crystallize on cold surfaces, such as relief valve inlets or rupture disks. The uninhibited condensate may then polymerize. Pressure relief devices and their connected lines should be checked periodically for the presence of polymer and/or frozen methacrylic acid, to prevent interference with their proper operation. Relief valves and nozzles can be electrically traced and insulated to help control polymer formation. They can continue to be flushed continuously with dry air. Environmental protection alternatives, such as containment of vapors with closed loop unloading or venting through a scrubber or incinerator, may also be considered.