Risk-based decision making method for maintenance policy selection of thermal power plant equipment

This study presents a decision-making method for maintenance policy selection of power plants equipment. The method is based on risk analysis concepts. The method first step consists in identifying critical equipment both for power plant operational performance and availability based on risk concepts. The second step involves the proposal of a potential maintenance policy that could be applied to critical equipment in order to increase its availability. The costs associated with each potential maintenance policy must be estimated, including the maintenance costs and the cost of failure that measures the critical equipment failure consequences for the power plant operation. Once the failure probabilities and the costs of failures are estimated, a decision-making procedure is applied to select the best maintenance policy. The decision criterion is to minimize the equipment cost of failure, considering the costs and likelihood of occurrence of failure scenarios. The method is applied to the analysis of a lubrication oil system used in gas turbines journal bearings. The turbine has more than 150 MW nominal output, installed in an open cycle thermoelectric power plant. A design modification with the installation of a redundant oil pump is proposed for lubricating oil system availability improvement. (C) 2009 Elsevier Ltd. All rights reserved.

Getting started with power tools; a basic readily understandable book on the fundamental operations of power-tool equipment.

Mode of access: Internet.

A Competitive assessment of the U.S. electric power generating equipment industry /

Item 231-B-1.

Direct and general support maintenance repair parts and special tools list for lubricating and servicing unit, power operated, trailer mounted, 23 cfm, compressor, reciprocating, GED (Elliott Machine model ENG 3), NSN 4930-00-935-4451.

"18 May 1990."

Organizational maintenance repair parts and special tools list for lubricating and servicing unit, power operated, trailer mounted, 23 cfm, compressor, reciprocating, GED (Elliott Machine model ENG 3), NSN 4930-00-935-4451.

"10 May 1990."

Organizational maintenance repair parts and special tools lists : lubricating and servicing unit, power operated, trailer mtd, 23 cfm compressor, reciprocating, gasoline driven (Henry Spen model 901765-1), NSN 4930-00-017-9167.

"19 September 1980."

Direct and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for lubricating and servicing unit, power operated, trailer mounted, 23 CFM, compressor, reciprocating, GED (Elliot machine model ENG 3), NSN 4930-00-935-4451.

"9 April 1987."

Direct support and general support maintenance manual : lubricating and servicing unit, power operated, trailer mounted, 23 CFM, compressor, reciprocating, gasoline driven, (Henry Spen model 901765-1), FSN 4930-017-9167.

"April 1970."

Operator, organizational, direct support and general support maintenance manual : lubricating and servicing unit, power operated, trailer mounted, 15 CFM compressor, reciprocating gasoline engine driven, (Elliot Machine Works, Inc. model ENG-3A), FSN 4930-842-8315.

"November 1974."

Operator and organizational maintenance manual : lubricating and servicing unit, power operated, trailer mounted, 23 cfm compressor, reciprocating, gasoline driven (Henry Spen model 901765-1), FSN 4930-017-9167.

Includes index.

Direct support and general support maintenance repair parts and special tools lists ... : lubricating and servicing unit, power operated, trailer mtd, 23 cfm compressor, reciprocating, gasoline driven (Henry Spen model 901765-1), NSN 4930-00-017-9167.

"10 October 1980."

Operator, organizational, direct support, and general support maintenance manual : lubricating and servicing unit, power operated, trailer mounted, 15 cfm compressor, reciprocating gasoline engine driven (Elliot Machine Works, Inc. model ENG-3A), FSN 4930-842-8315.

"November 1974."

The Tractor field book, with power farm equipment specifications.

Title varies slightly.

Temperature changes in dental pulp associated with use of power grinding equipment on equine teeth

Objective To quantify the temperature changes in the dental pulp associated with equine dental procedures using power grinding equipment. Design A matrix experimental design with replication on the same sample was followed to allow the following independent variables to be assessed: horse age (young or old), tooth type (premolar or molar), powered grinding instrument (rotating disc or die grinder), grinding time (15 or 20 seconds) and the presence or absence of water coolant. Procedure Sound premolar and molar teeth from a 6-year-old horse and a 15-year-old horse, which had been removed postmortem, were sectioned parallel to the occlusal plane to allow placement of a miniature thermocouple at the level of the dental pulp. The maximum temperature increase, the time taken to reach this maximum and the cooling time were measured (n=10 in each study). The teeth were placed in a vice and the instrument used on the tooth as per clinical situation. Results Significant differences were recorded for horse age (P < 0.001), instrument type (P < 0.001), grinding time (P < 0.001) and presence or absence of coolant (P < 0.001). There was no significant difference for tooth type. Conclusion Thermal insult to the dental pulp from the use of power instruments poses a significant risk to the tooth. This risk can be reduced or eliminated by appropriate selection of treatment time and by the use of water irrigation as a coolant. The increased dentine thickness in older horses appears to mitigate against thermal injury from frictional heat.

Utilização de resíduos e derivados de madeira para confecção de uma guitarra elétrica

The residues generation is a quite serious problem in several industrial areas and also in the lumbering area. The search for the elimination or reduction of the volume of generated residues is endless, however limited, resulting in the search for a proper destination or better use, instead of simply burning it. A lot of uses and services are commonly proposed, but with low aggregated value to the residue. This work shows the usage viability of different discarded residues and wood composites in the production of an electric guitar. Cupiúba, ipê and jatobá residues have been used besides wood composites of pinus. The residues and wood composites have shown appropriate resistance, surfacing quality and design terms, and could be used to substitute the traditionally wood used in the production of the instrument as well as in other products of similar characteristics and with larger aggregated value.