What is the poss mass test?

What is the poss mass test?

Developed by the Edison Energy Institute (EEI) for use by nuclear, hydropower, or fossil fuel companies, POSS is an 80-minute, multiple choice, pencil -and -paper assessment of the cognitive skills needed for competent performance in such jobs as operators of turbines, boilers, or control rooms.

What was the failure mode of the heat exchanger in the Tesoro Anacortes incident?

Seattle, Washington, January 29, 2014—The April 2010 fatal explosion and fire at the Tesoro refinery in Anacortes, Washington was caused by damage to the heat exchanger, a mechanism known as “high temperature hydrogen attack” or HTHA, which severely cracked and weakened carbon steel tubing leading to a rupture.

What went wrong oil refinery disaster?

As workers restarted a component of the unit, abnormal pressure built up in the production tower, and so three relief valves opened to allow highly volatile gasoline components to escape to the 10 x 20-ft. “blowdown” drum. But so much fuel flooded into the drum that its capacity was rapidly exceeded.

What happened Tesoro refinery?

Tesoro Corporation — the San Antonio, Texas-based company that owns a large petroleum refinery in Nikiski — will change its name to Andeavor after acquiring the oil refiner and marketer Western Refining in a $4.1 billion deal that closed June 1. The name change will be made August 1.

Which of the following contributed to the Tesoro refinery incident investigated by CSB?

What is a raffinate splitter?

The raffinate splitter tower was a vertical distillation column with an inside diameter of 3.8 m and height of 52 m with an approximate liquid-full volume of 586,100 liters. The tower was fitted with 70 distillation trays that separated the light from the heavy raffinate (Figure 1).

What is the difference between crude oil and refined oil?

Refined petroleum products are derived from crude oils through processes such as catalytic cracking and fractional distillation. These products have physical and chemical characteristics that differ according to the type of crude oil and subsequent refining processes.

How is poss test scored?

The number of questions you get right on the POSS will determine your overall score. The score is determined by taking the individual sections’ scores and combining them so they may be evaluated on a scoring scale of 0 to 15 with 15 indicating a candidate’s high probability of success in the workplace.

What is the Cobra simulation test?

Console Operator Basic Requirements Assessment (COBRA) is a completely automated assessment test. Since 1993, over 100,000 prospective console operators have been screened at 150+ customer locations worldwide. COBRA is an ideal screening test for the following console positions: Chemical Plant Operator.

Who owns Tesoro oil company?

Marathon Petroleum
Tesoro, known at the time as Andeavor, was acquired by Marathon Petroleum on October 1, 2018.

What is the difference between extract and raffinate?

Liquid extraction is the separation of the constituents of a liquid by contact with another insoluble liquid called solvent. The constituents get distributed between the two phases. The solvent rich phase is called extract and the residual liquid from which the solute has been removed is called raffinate.

What is C4 raffinate?

Mixed C4s, also known as Crude C4, Raffinate 1 or Raffinate 2, are colourless gases (liquid under pressure), with a mild, petroleum-like odour. Raffinate 1 is the product remaining when butadiene is extracted from a lower olefin stream (known as crude C4).