Therefore, water content in crude oil is only a bad thing. Water content in crude oil not only increases the load of storage, transportation, refinery and other equipment, but increases the fuel consumption when the temperature heats up, even causing the fouling or corrosion of equipment and pipes because of salt-containing water. Moreover, all oilfields need to go through water cut development period, especially the oil fields with fast rate oil production and strong water injection, Anhydrous oil production periods are generally shorter, water breakthrough of oil wells is earlier and water content of crude oil is growing faster. The former is transported by furnacing or mixed hydrothermal with wellhead gas and water, and the latter is transported accompanied by hot water, steam, skin effect and other heating methods. Heated oil transportation is generally used home and abroad when it comes to this kind of crude oil, Heated oil transportation can be divided into direct heated oil transportation and indirect heated oil transportation. Employee #1 was killed at the scene a s a result of multiple bodily trauma to head, upper, and lower body parts result ing in death.With the development of oil industry, hypercoagulable and high- viscosity crude oils increasing their proportion in total oil production capacity. The cap's welds broke at the rolled stock's edge conne ction in the over-pressurized environment. The ruptured cap was forcefully projected across the aisle from where the work was being performed. When the employee walk ed around the end of the tank, and next to the tank's welded cap's edge, the cap ruptured (mechanical explosion due to rapid expansion of gas), striking Employe e #1. Employee #1 acknowledged the command, stopped welding, and began t o walk in the direction away from his supervisor, along the long side of the tan k, towards Employee #1's tools and Welder Unit Number 24. According to the direct supervisor's recollection, at that time he advised Employee #1 to stop t he operation. This condition was observed by the Employee # 1's direct supervisor during a walkthrough of the welding area. The heat from the welding process imposed onto the tank further increased the internal pressure being buil t-up with supplied compressed air. Next, Employee #1 began to weld the tank's middle seam while air pressure was developing. Then, Employee #1 connected a quick disconnect air hose from the piped shop compresse d air supply to one of the handle-type ball valves on the air regulating fixture that allowed for pressurizing of the tank. Once the current weldin g task was completed, Employee #1 capped and/or plugged all other openings in th e tank and connected the air regulating fixture equipped with a psi gauge and tw o handle-type ball valves to the tank caps 0.25-inch relief valve opening. Prior to performing the tank's air leak t esting, Employee #1 was welding caps on the tank's ends and its middle seam wher e two rolled cylinders were connected to form this tank. A spray bottle with soapy water solution was prepared for air leak testing of the welds' sealing and penetration. The facility's air compressor regulated to approximately 134 psi was used for pressurizing the tank through its connections from one of the shop's main air l ines and a quick disconnect hose attached to the air regulating fixture on the t ank. The vacuum tank was placed horizontally on the mov able platform that allowed for its transport and also rolling it around its axis for worker's convenience during welding and other tasks such as air leak testin g. Metal Inert Gas MIG with the Miller #24 MIG welder (Millermatic Model No. Arc welding process was utilized, Gas Metal Arc Welding GMAW i. Accident: 70704.015 - Report ID: 0521400 - Event Date: Īt approximately 9:30 p.m., on February 2, 2015, an employee, a welder, who had been employed by the company for approximately 10 work days, was welding and sim ultaneously pressurizing approximately a 500 gallon mild-steel vacuum tank for a ir leak testing.
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