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NASA-LLIS-0299
Lessons Learned - Dry Well Transducer Installations are Susceptial to Inadvertent Removal
Year: 1993
Abstract: Description of Driving Event:
A Hypergol technician erred in the removal of a temperature transducer from a 3-inch Hypergol line at the pad "A" fuel farm, resulting in a major fuel spill. The installation design of the dry well and temperature transducer provide a means to remove the transducer from the system for replacement or calibration without having to open the fluid volume. The dry well installation design is inadequate to preclude an untrained or careless technician from inadvertently removing the dry well from the Hypergol propellant line by mistake.
Additional Comments:
OMI V2196 Titled: "Hyper Fuel System Validation Storage Area-Local Control/LPS" has been updated to include the following warning: "Removing transducers from dry wells may be hazardous. A restaining retainer is designed to prevent removal of dry well while secured in place by set screws. As transducers are being removed from dry wells, PMTG shall visually verify that dry wells are not turning. Wear face shield, apron and rubber gloves and use extreme care to avoid inadvertent loosening of any temperature XDCR dry well, which could release MMH liquid. If A78633 TEMP XDCR dry well is loosened the entire storage tank contents could be released."
A Hypergol technician erred in the removal of a temperature transducer from a 3-inch Hypergol line at the pad "A" fuel farm, resulting in a major fuel spill. The installation design of the dry well and temperature transducer provide a means to remove the transducer from the system for replacement or calibration without having to open the fluid volume. The dry well installation design is inadequate to preclude an untrained or careless technician from inadvertently removing the dry well from the Hypergol propellant line by mistake.
Additional Comments:
OMI V2196 Titled: "Hyper Fuel System Validation Storage Area-Local Control/LPS" has been updated to include the following warning: "Removing transducers from dry wells may be hazardous. A restaining retainer is designed to prevent removal of dry well while secured in place by set screws. As transducers are being removed from dry wells, PMTG shall visually verify that dry wells are not turning. Wear face shield, apron and rubber gloves and use extreme care to avoid inadvertent loosening of any temperature XDCR dry well, which could release MMH liquid. If A78633 TEMP XDCR dry well is loosened the entire storage tank contents could be released."
Subject: Energetic Materials - Explosive/Propellant/Pyrotechnic
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:19:39Z | |
| date available | 2017-09-04T17:19:39Z | |
| date copyright | 08/18/1993 | |
| date issued | 1993 | |
| identifier other | ZNZCQCAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/142884 | |
| description abstract | Description of Driving Event: A Hypergol technician erred in the removal of a temperature transducer from a 3-inch Hypergol line at the pad "A" fuel farm, resulting in a major fuel spill. The installation design of the dry well and temperature transducer provide a means to remove the transducer from the system for replacement or calibration without having to open the fluid volume. The dry well installation design is inadequate to preclude an untrained or careless technician from inadvertently removing the dry well from the Hypergol propellant line by mistake. Additional Comments: OMI V2196 Titled: "Hyper Fuel System Validation Storage Area-Local Control/LPS" has been updated to include the following warning: "Removing transducers from dry wells may be hazardous. A restaining retainer is designed to prevent removal of dry well while secured in place by set screws. As transducers are being removed from dry wells, PMTG shall visually verify that dry wells are not turning. Wear face shield, apron and rubber gloves and use extreme care to avoid inadvertent loosening of any temperature XDCR dry well, which could release MMH liquid. If A78633 TEMP XDCR dry well is loosened the entire storage tank contents could be released." | |
| language | English | |
| title | NASA-LLIS-0299 | num |
| title | Lessons Learned - Dry Well Transducer Installations are Susceptial to Inadvertent Removal | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1993 | |
| contenttype | fulltext | |
| subject keywords | Energetic Materials - Explosive/Propellant/Pyrotechnic | |
| subject keywords | Facilities | |
| subject keywords | Hazardous/Toxic Waste/Materials |