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Vacuum Probe, Standard Leaks, and Needle Valve for Use with the Helium Leak Detector

Description: The following report is split into four parts describing the usage of a vacuum probe for leak hunting with the Helium Leak Detector, the two types of Standard Leaks that were designed to measure the sensitivity of the detector, the development of a needle valve adjusted for controlling the flow of a standard mixture of helium and air into the leak detector for a sensitivity check by the single leak method, and a worm and gear adjustment developed to facilitate throttling of the Helium Leak Detector on a vacuum header equipped with the 3/8" Kerotect angle valve.
Date: August 1945
Creator: Samuel, A. J.
Partner: UNT Libraries Government Documents Department

Acoustic Leak Detection for District Heating Systems

Description: An acoustic leak detection facility was completed and used to evaluate the capability of piezoelectric sensors, accelerometers, and capacitance microphones to detect and locate gas and water leaks in underground district heating and cooling (DHC) piping. Leak detection sensitivity and location capabilities for DHC systems were estimated from laboratory data and from data obtained from the underground DH system in Scranton, Pennsylvania, where acoustic background noise levels and acoustic signals from field-induced steam leaks were acquired. Acoustic detection of leaks with flow rates of less than 10 gpm is possible at a distance of several hundred meters, with a location accuracy of a few meters. Although steam leaks of comparable mass loss can be detected over a similar range with transducers mounted on the pipe outer wall, location accuracy of a few meters over this range may only be possible with transducers in direct contract with the steam. Intrusive sensors may also be necessary to detect and locate leaks in plastic pipe.
Date: February 1988
Creator: Kupperman, D. S. & Karvelas, D. E.
Partner: UNT Libraries Government Documents Department

Automated leak test systems

Description: An automated leak test system for tritium shipping containers has been developed at Westinghouse Savannah River Co. (WSRC). The leak detection system employs a computer controlled helium detector which allows an operator to enter key information when prompted. The software for controlling the tests and the equipment apparatus were both designed and manufactured at the Savannah River Technology Center within WSRC. Recertification Test: Every twelve months, the pressure vessel portion of the shipping container itself must undergo a rigorous recertification leak test. After an empty pressure vessel (shipping container) is assembled, it is placed into one of six stainless steel belljars for helium leak testing. The belljars are fashioned in row much the same as assembly line arrangement. Post-load Test: A post-load leak test is performed upon reservoirs that have been filled with tritium and placed inside the shipping containers mentioned above. These leak tests are performed by a rate-of-rise method where the area around the shipping container seals is evacuated, valved off from the vacuum pump, and then the vacuum pressure is monitored over a two-minute period. The Post Load Leak Test is a quality verification test to ensure that the shipping container has been correctly assembled. 2 figs.
Date: September 15, 1997
Creator: Cordaro, J.V.; Thompson, W.D. & Reeves, G.
Partner: UNT Libraries Government Documents Department

Valve Operating System System Description No. 10

Description: A description is given of the valve operating system for the PWR. The valves served by this system are a component pant of the following systems: reactor coolant system; pressurizer and pressure relief system; coolant discharge and vent system; and failed element detection and location system. (W.L.H.)
Date: May 1, 1957
Partner: UNT Libraries Government Documents Department

Shoe-String Automation

Description: Faced with a downsizing organization, serious budget reductions and retirement of key metrology personnel, maintaining capabilities to provide necessary services to our customers was becoming increasingly difficult. It appeared that the only solution was to automate some of our more personnel-intensive processes; however, it was crucial that the most personnel-intensive candidate process be automated, at the lowest price possible and with the lowest risk of failure. This discussion relates factors in the selection of the Standard Leak Calibration System for automation, the methods of automation used to provide the lowest-cost solution and the benefits realized as a result of the automation.
Date: July 30, 2001
Creator: Duncan, M.L.
Partner: UNT Libraries Government Documents Department

Florida Hydrogen Initiative

Description: The Florida Hydrogen Initiative (FHI) was a research, development and demonstration hydrogen and fuel cell program. The FHI program objectives were to develop Florida?s hydrogen and fuel cell infrastructure and to assist DOE in its hydrogen and fuel cell activities The FHI program funded 12 RD&D projects as follows: Hydrogen Refueling Infrastructure and Rental Car Strategies -- L. Lines, Rollins College This project analyzes strategies for Florida's early stage adaptation of hydrogen-powered public transportation. In particular, the report investigates urban and statewide network of refueling stations and the feasibility of establishing a hydrogen rental-car fleet based in Orlando. Methanol Fuel Cell Vehicle Charging Station at Florida Atlantic University ? M. Fuchs, EnerFuel, Inc. The project objectives were to design, and demonstrate a 10 kWnet proton exchange membrane fuel cell stationary power plant operating on methanol, to achieve an electrical energy efficiency of 32% and to demonstrate transient response time of less than 3 milliseconds. Assessment of Public Understanding of the Hydrogen Economy Through Science Center Exhibits, J. Newman, Orlando Science Center The project objective was to design and build an interactive Science Center exhibit called: ?H2Now: the Great Hydrogen Xchange?. On-site Reformation of Diesel Fuel for Hydrogen Fueling Station Applications ? A. Raissi, Florida Solar Energy Center This project developed an on-demand forecourt hydrogen production technology by catalytically converting high-sulfur hydrocarbon fuels to an essentially sulfur-free gas. The removal of sulfur from reformate is critical since most catalysts used for the steam reformation have limited sulfur tolerance. Chemochromic Hydrogen Leak Detectors for Safety Monitoring ? N. Mohajeri and N. Muradov, Florida Solar Energy Center This project developed and demonstrated a cost-effective and highly selective chemochromic (visual) hydrogen leak detector for safety monitoring at any facility engaged in transport, handling and use of hydrogen. Development of High Efficiency Low Cost Electrocatalysts ...
Date: June 30, 2013
Creator: Block, David L.
Partner: UNT Libraries Government Documents Department

Calculation of SY tank annulus continuous air monitor readings after postulated leak scenarios

Description: The objective of this work was to determine whether or not a continuous air monitor (CAM) monitoring the annulus of one of the SY Tanks would be expected to alarm after three postulated leak scenarios. Using data and references provided by Lockheed Martin`s Tank Farm personnel, estimated CAM readings were calculated at specific times after the postulated scenarios might have occurred. Potential CAM readings above background at different times were calculated for the following leak scenarios: Leak rate of 0.01 gal/min; Leak rate of 0.03 gal/min (best estimate of the maximum probable leak rate from a single-shell tank); and Leak of 73 gal (equivalent to a {1/4}-in. leak on the floor of the annulus). The equation used to make the calculations along with descriptions and/or explanations of the terms are included, as is a list of the assumptions and/or values used for the calculations.
Date: August 1, 1998
Creator: Kenoyer, J.L.
Partner: UNT Libraries Government Documents Department

Contamination free helium leak detection of sensitive systems

Description: High Technology Systems (HTS) with sensitive surfaces, such as superconducting radio frequency (SRF) accelerating cavities, polarized electron sources (PES) for accelerators and many others, are prone to degradation when subjected to particulate or hydrocarbon contaminants. Particulate contamination control of SRF cavity surfaces and vacuum components have been discussed by several authors at this contamination workshop. Hydrocarbon contamination mainly results from prolonged evacuation with conventional oil lubricated pumping systems and/or prolonged leak detection with conventional leak detectors. The sensitivity of the conventional leak detectors suffers due to the back-streaming of atmospheric helium (5 x 10{sup {minus}1} Pa) through the pumping systems and/or the trapping of helium in the O-rings and oils of the pumping systems. This reduced sensitivity leads to the use of the leak detectors over long periods of time for detecting small (1 x 10{sup {minus}10} atm. cc s{sup {minus}1}) leaks in HTS thereby exposing the sensitive surfaces to contamination. In this paper, a review of the work in progress, at Thomas Jefferson Accelerator Facility (Jefferson Lab), in reducing the contamination of sensitive surfaces is presented.
Date: January 1, 1997
Creator: Myneni, G.
Partner: UNT Libraries Government Documents Department

Electronic Refrigerant Leak Detector

Description: The project was comprised of three main tasks: (1) develop, design, and fabricate 20 sensors; (2) develop, design, and fabricate 5 test instruments; (3) testing and data analysis.
Date: September 27, 1999
Creator: Elie Talamas, Jr.
Partner: UNT Libraries Government Documents Department

Detection and Location of Leaks in District Heating Steam Systems: Survey and Review of Current Technology and Practices

Description: This report presents the results of a survey undertaken to identify and characterize current practices for detecting and locating leaks in district heating systems, particular steam systems. Currently used technology and practices are reviewed. In addition, the survey was used to gather information that may be important for the application of acoustic leak detection. A few examples of attempts to locate leaks in steam and hot water pipes by correlation of acoustic signals generated by the leaks are also discussed.
Date: March 1992
Creator: Kupperman, D. S.; Raptis, A. C. & Lanham, R. N.
Partner: UNT Libraries Government Documents Department

A LOW-COST GPR GAS PIPE & LEAK DETECTOR

Description: A light-weight, easy to use ground penetrating radar (GPR) system for tracking metal/non-metal pipes has been developed. A pre-production prototype instrument has been developed whose production cost and ease of use should fit important market niches. It is a portable tool which is swept back and forth like a metal detector and which indicates when it goes over a target (metal, plastic, concrete, etc.) and how deep it is. The innovation of real time target detection frees the user from having to interpret geophysical data and instead presents targets as dots on the screen. Target depth is also interpreted automatically, relieving the user of having to do migration analysis. In this way the user can simply walk around looking for targets and, by ''connecting the dots'' on the GPS screen, locate and follow pipes in real time. This is the first tool known to locate metal and non-metal pipes in real time and map their location. This prototype design is similar to a metal detector one might use at the beach since it involves sliding a lightweight antenna back and forth over the ground surface. The antenna is affixed to the end of an extension that is either clipped to or held by the user. This allows him to walk around in any direction, either looking for or following pipes with the antenna location being constantly recorded by the positioning system. Once a target appears on the screen, the user can locate by swinging the unit to align the cursor over the dot. Leak detection was also a central part of this project, and although much effort was invested into its development, conclusive results are not available at the time of the writing of this document. Details of the efforts that were made as a part of this cooperative agreement ...
Date: March 30, 2005
Creator: Cist, David & Schutz, Alan
Partner: UNT Libraries Government Documents Department

SEALING SIMULATED LEAKS

Description: This report details the testing equipment, procedures and results performed under Task 7.2 Sealing Simulated Leaks. In terms of our ability to seal leaks identified in the technical topical report, Analysis of Current Field Data, we were 100% successful. In regards to maintaining seal integrity after pigging operations we achieved varying degrees of success. Internal Corrosion defects proved to be the most resistant to the effects of pigging while External Corrosion proved to be the least resistant. Overall, with limitations, pressure activated sealant technology would be a viable option under the right circumstances.
Date: September 1, 2004
Creator: Romano, Michael A.
Partner: UNT Libraries Government Documents Department

Technical summary: Feasibility study of conductivity monitoring for leak detection in double-walled plutonium containers

Description: Currently, the storage container for the pit from a dismantled warhead is a sealed outer container, or drum, within which the pit is suspended. Since the pit itself is a sealed, stainless steel container for the plutonium, the inner plus the outer containers constitute the {open_quotes}double-walled{close_quotes} configuration for plutonium storage. If either inner or outer wall of the container fails, the fill-gas between the pit and drum walls will contain species that will modify the physical properties of that gas. The work summarized here reports the initial feasibility study for an innovative approach for monitoring for leakages both for radioactive materials from the pit and for the intrusion of outside into the drum by monitoring the electrical conductivity of the fill-gas. For the gas present in a drum containing a pit, alphas from decays of plutonium are stopped by the primary container wall of the pit itself unless pit leakage occurs. If plutonium leaks from the pit and enters the fill-gas (either noble gas or air) of the outer container, each of the alpha particles due to the decay of plutonium will create about 10{sup 5} electron-ion pairs along its track. If the fill gas is a noble gas, these electrons will diffuse in the gas as free electrons.
Date: November 1, 1997
Creator: Lu, J. X. & Marlow, W. H.
Partner: UNT Libraries Government Documents Department