By BP Process Safety Series
This publication raises the notice of operators in the chemical and technique industries, to the risks of trapped strain and vacuum. It starts by means of describing trapped strain and vacuum and their makes use of in the strategy industries, sooner than mentioning the aptitude risks. utilizing case stories of exact injuries to focus on the aptitude threats and clarify the potential reasons, it increases the information and information of operators to the hazards of trapped strain and vacuum, permitting them to identify and rectify risks sooner than injuries ensue. The publication concludes with a self-test part permitting readers to check their realizing of the data offered. This serves as a very good advent to the subject for college students.
desk of Contents
2. risks of Trapped strain
three. dangers of Vacuum
four. issues to recollect
brief Bibliography for rules and Norms
try out your self!
Acronyms and Abbreviations
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Extra resources for Hazards of Trapped Pressure and Vacuum
He died in hospital after surgery. com. 56 HAZARDS OF TRAPPED PRESSURE AND VACUUM ACCIDENT Pressure testing of choke manifold! Pressure testing was being performed on a offshore well choke manifold up to 5,000 psig (345 barg) inside a pressure test bay at an onshore base. While a workshop foreman and a technician were inside the test bay inspecting the choke manifold for leaks, a thermowell (3/4" NPT) failed and hit the technician in the leg, seriously injuring his right knee. 8 tons)! The injury was caused when the technician was struck by a thermowell ejected from a 3/4" NPT female tapping in a 5,000 psig (345 barg) choke manifold during a pressure test.
ACCIDENT LNG plant explosion due to closed block valve! A block valve between the shell side of the main cryogenic heat exchanger and the blowdown system had not been opened by the plant operators after the tie-ins for a new production train were completed. This isolated the shell side of the heat exchanger from its relief system. As part of the start-up procedure, defrosting gas (dry methane) was introduced into the shell side of the cryogenic exchanger, with the exit to the blowdown system blocked!
5 bar). 3 barg). Condensate downstream of relief valves The potential dangers of condensate build-up downstream of relief valves discharging to atmosphere include not only a risk of potential seizure but can also result in: • • increased back pressure from the static column of condensate; scalds when a steam relief valve lifts. 95 cm) hole drilled in the horizontal section of the tail-pipe to drain rain water and any condensate. Unfortunately, as appears to have occurred in past incidents, the drain becomes choked with rust formed by the reaction of air (oxygen) and steel allowing liquid to collect.