Flare Gas Recovery Ejector

Problem To prevent gas emissions to atmosphere, a simple flare gas recovery system was required which could safely and economically compress low pressure waste gas back into the production process. Solution Transvac Flare Gas Recovery Ejectors are ideally  suited to this application because they can employe high-pressure gas energy; from an existing source, to entrain and compress waste to a pressure where the gas can be used in the production process. For this application the Transvac Ejector was designed to use high pressure motive gas from the 2nd stage Compressor discharge to entrain low pressure flare gas and to...

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Fluid Flow : Velocity Head

Two of the most useful and basic equations are where Dh = Head loss in feet of flowing fluid u = Velocity in ft/sec g = 32.2 ft/sec2 P = Pressure in lb/ft2 V = Specific volume in ft3/lb Z = Elevation in feet E = Head loss due to friction in feet of flowing fluid In Equation 1 Dh is called the “velocity head.” This expression has a wide range of utility not appreciated by many. It is used “as is” for 1.     Sizing the holes in a sparger 2.     Calculating leakage through a small hole 3.     Sizing a restriction orifice 4.     Calculating the flow...

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Failure Mode and Effects Analysis

Description of the Method A FMEA is used to examine each potential failure mode of a process to determine the effects of the failure on the system. A failure mode is the symptom, condition, or fashion in which hardware fails. It may be identified as a loss of function, a premature function (function without demand), an out-of-tolerance condition, or a physical characteristic, such as a leak, observed during inspection. The effect of a failure mode is determined by the system's response to the failure. Analysis Procedure A FMEA has three steps: (1) defining the process, (2) performing the analysis, and (3) documenting the results. Defining...

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Energy Recovery with Compact Heat Exchangers

Compact heat exchangers are used for heat recovery applications where high efficiency is vital, space or weight constraints apply, or exotic materials are required. Marcos Matsufugi Alfa Laval The refinery business is under constant pressure to increase efficiency. A highly competitive market combined with rising energy and feedstock costs require refineries to ramp up production while cutting operating costs. Switching from shell-and-tube to welded plate heat exchangers (also known as compact heat  exchangers) is a proven and straight forward way of solving the problem. The use of compact heat exchangers offers benefits in...

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