New at PipingDesign.com: 30 January 2001

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Steam Specialties Calculators
Hoffman Specialty

<<Online calculators for the following: Flash Steam Loss
Calculation (allows easy calculation of flash steam loss and associated energy cost, values from "Properties of Saturated Steam Tables" automatically considered - no need to look up information, allows user input of their actual cost of steam, calculates energy loss on an hourly and annual basis, allows calculation of energy savings by operating steam equipment at a lower pressure, calculates required flash tank size); Steam Pipe Sizing (allows quick sizing of steam lines, showing steam velocities and pressure drop in calculated pipe size, values from "Weight-Flow Rate" and "Velocity of Steam" charts automatically considered - no need to look up information, calculates approximate pipe size, calculates steam velocity and pressures drop per 100 feet of calculated pipe size); Sizing Condensate Return Lines (allows quick sizing of condensate return lines, values from "Weight-Flow Rate" and "Velocity of Steam" charts automatically considered - no need to look up information, calculates approximate return pipe size); Steam Loss Through Failed Trap (allows easy calculation of flash steam loss and associated energy cost through a failed steam trap, values from "Properties of Saturated Steam Tables" automatically considered - no need to look up information, calculates energy loss on an hourly basis, calculates cost of steam loss on an annual basis).>>

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Eductors for Pumping Liquids and Gases
Northeast Controls Inc.

<<Water jet eductors utilize the kinetic energy of one liquid to
cause the flow of another. Eductors consist of a converging nozzle, a body and a diffuser and resemble syphons in appearance. In operation, the pressure energy of the motive liquid is converted to velocity energy by the converging nozzle. The high velocity liquid flow then entrains the suction liquid. Complete mixing of the motive and suction is performed in the body and diffuser section. The mixture of liquids is then converted back to an intermediate pressure after passing through the diffuser.>>

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Valve Interlocks for Pig launcher and Receiver Systems Baker Hughes Incorporated

<<It might reasonably be said that the singular greatest hazard
associated with the operation of pig traps is the exceptional event of opening the closure, whereas launching and receiving procedures in themselves are quite straightforward and relatively safe. DNV TN B 302 Technical Notes for Fixed Offshore Installations describes PIG TRAPS as 'primary grades sources of hazard'. The following is a case example of an interlocked gas launcher using a simple 'linear key logic' where there are no deviations from the prescribed procedure. The vessel valves are all manually operated and the example given shows venting to atmosphere and the assumption in this case is that there is no sour gas (H2S) or other hazardous by-products present in the process.>>

<a href="http://www.pipingdesign.com/manualvalves.html">http://www.pipingdesign.com/manualvalves.html</a>

Isolation Valve Failure Definitions
CG Industrial Specialties Ltd.

<<The purpose of this technical paper is to describe valve failure
and offer definitions and a method to identify them. The failure of the valve in question must be clearly communicated so that the subjective statement of the valve "owner" is translated into the objective description of an unsatisfactory event that can be understood by the valve "vendor". A set of steps is proposed to reach a common understanding. Simply put, the statement "Your valve failed!" adds nothing to help solve the problem, if in fact there is one. Valves operate in two distinct arenas: as Control Valves or Isolation Valves. Control Valves experience their own failure problems, primarily due to the non-repetitive response to an identical signal. This failure mechanism and others is examined in another CGIS Techdata paper entitled Control Valve Failure Definitions. For isolation valves there are two main problems: Failure to Isolate and Failure to Operate. >> Received on Tue Jan 30 17:53:00 2001