The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform

W.e. Bill Forsthoffer - One of the best experts on this subject based on the ideXlab platform.

  • Auxiliary system function summary
    Forsthoffer's Rotating Equipment Handbooks, 2005
    Co-Authors: W.e. Bill Forsthoffer
    Abstract:

    This chapter presents a summary of auxiliary system function. Every Critical Equipment Component can be treated as an equivalent orifice in a system with an upstream equivalent vessel. In the case of gradual bearing wear, the diameter of the equivalent bearing orifice would increase. The auxiliary system bypass valve sensing system pressure decrease would close to maintain the preset pressure value in the auxiliary system. Typically, auxiliary pump start-up is checked with the unit on line to assure the integrity of the automatic pump start system. This action will cause a sudden system pressure increase as the supply flow to the equivalent vessel will significantly exceed the demand flow from the vessel. It is found that any variation of auxiliary pump start-up time or bypass valve closing time could cause a unit trip. An effective on-site functional test program is required to assure proper auxiliary pump start-up times and bypass valve closing times. In view of the exposure to unit trips resulting from auxiliary pump starting times and bypass valve closing times, an accumulator is often installed. Serious consideration should be given to the requirement for properly sized and installed accumulators on all Critical units.

  • The development of an auxiliary system
    Forsthoffer's Rotating Equipment Handbooks, 2005
    Co-Authors: W.e. Bill Forsthoffer, W.e. Bill Forsthoffer
    Abstract:

    This chapter details the development of an actual auxiliary system to fully understand the function of each major Component and how it contributes to the total operation and reliability of the system. To determine the system requirements, the information needed includes system design, Critical Equipment vendor data, and site conditions. The system schematic can be defined in the end users specifications and data sheets or can be the vendor's design. It is found that as bearings are not custom designed for each application, there are ranges of acceptable bearing loads. It can be seen that the capacity of a positive displacement pump remains essentially constant while the capacity of a dynamic pump increases with decreasing system pressure. In the case of a properly sized dynamic pump, the additional Critical Equipment Component oil flow required because of wear will be automatically available. Having obtained the system flow rate, the minimum system operating capacity can be determined. The maximum pump discharge pressure will be determined by a similar calculation at maximum Component pressure drop conditions and the minimum allowable oil temperature of the system.

  • Auxiliary system specifications
    Forsthoffer's Rotating Equipment Handbooks, 2005
    Co-Authors: W.e. Bill Forsthoffer
    Abstract:

    This chapter describes the various aspects of auxiliary system specifications. The proper specification of a grass roots auxiliary system or the specification of specific Components that are being modified in an existing system is essential to Critical Equipment reliability. In order to assure that minimum time is spent on maintenance and the calibration of auxiliary Components during operation of the unit, the system should be arranged to provide a maximum accessibility to all Components for maintenance. In addition to the system arrangement, the location of the console relative to the Critical Equipment unit should be specified at this time, this is necessary to determine the size and shape of the reservoir. It is important to ensure that all Critical Equipment vendors specify the Critical Equipment Component conditions that are similar. Any specific Component requirement resulting from the users past experience should be noted in the specification or the data sheet that is initially sent to quoting vendors. In addition, if the main pump is desired to be shaft driven, this fact should be stated. It is suggested that a detailed cooler data sheet should be attached to the specification.

W.e. Bill Forsthoffer - One of the best experts on this subject based on the ideXlab platform.

  • The development of an auxiliary system
    Forsthoffer's Rotating Equipment Handbooks, 2005
    Co-Authors: W.e. Bill Forsthoffer, W.e. Bill Forsthoffer
    Abstract:

    This chapter details the development of an actual auxiliary system to fully understand the function of each major Component and how it contributes to the total operation and reliability of the system. To determine the system requirements, the information needed includes system design, Critical Equipment vendor data, and site conditions. The system schematic can be defined in the end users specifications and data sheets or can be the vendor's design. It is found that as bearings are not custom designed for each application, there are ranges of acceptable bearing loads. It can be seen that the capacity of a positive displacement pump remains essentially constant while the capacity of a dynamic pump increases with decreasing system pressure. In the case of a properly sized dynamic pump, the additional Critical Equipment Component oil flow required because of wear will be automatically available. Having obtained the system flow rate, the minimum system operating capacity can be determined. The maximum pump discharge pressure will be determined by a similar calculation at maximum Component pressure drop conditions and the minimum allowable oil temperature of the system.

A A Edris - One of the best experts on this subject based on the ideXlab platform.

  • real time monitoring and dynamic thermal rating of power transmission circuits
    IEEE Transactions on Power Delivery, 1996
    Co-Authors: D A Douglass, A A Edris
    Abstract:

    ANSI standards for power Equipment, and a vast store of technical literature, describe various methods by which thermal ratings may be adjusted if actual weather conditions are known or if the "overload" is to be applied for a limited period of time. These methods have been given various names including dynamic thermal rating, on-line rating, and dynamic ratings to describe the process of adjusting thermal ratings of power Equipment for actual weather conditions and actual electrical load patterns. This paper discusses in detail a project undertaken by the Electric Power Research Institute (RP 3022-7) as part of its research on Flexible AC Transmission. This project avoids dependence on temperature measurement, instead, calculating Critical Equipment Component temperatures based solely on real-time weather and electrical current. Inexpensive, commercially available weather stations, digital data loggers, and IBM-compatible PC computers are combined with sophisticated thermal algorithms to yield a portable, flexible, instrumentation method which can rate several transmission circuits simultaneously, including underground cable, overhead lines, power transformers, current transformers, switches, bus, line traps, and circuit breakers. Useable increases of 5% to 15% in the thermal capacity of transmission Equipment circuits result.

D A Douglass - One of the best experts on this subject based on the ideXlab platform.

  • real time monitoring and dynamic thermal rating of power transmission circuits
    IEEE Transactions on Power Delivery, 1996
    Co-Authors: D A Douglass, A A Edris
    Abstract:

    ANSI standards for power Equipment, and a vast store of technical literature, describe various methods by which thermal ratings may be adjusted if actual weather conditions are known or if the "overload" is to be applied for a limited period of time. These methods have been given various names including dynamic thermal rating, on-line rating, and dynamic ratings to describe the process of adjusting thermal ratings of power Equipment for actual weather conditions and actual electrical load patterns. This paper discusses in detail a project undertaken by the Electric Power Research Institute (RP 3022-7) as part of its research on Flexible AC Transmission. This project avoids dependence on temperature measurement, instead, calculating Critical Equipment Component temperatures based solely on real-time weather and electrical current. Inexpensive, commercially available weather stations, digital data loggers, and IBM-compatible PC computers are combined with sophisticated thermal algorithms to yield a portable, flexible, instrumentation method which can rate several transmission circuits simultaneously, including underground cable, overhead lines, power transformers, current transformers, switches, bus, line traps, and circuit breakers. Useable increases of 5% to 15% in the thermal capacity of transmission Equipment circuits result.