USGS Hydrologic Instrumentation Facility
Water Data for the Nation
ABOUT THE HIF
USGS IN YOUR STATE
USGS Water Science Centers are located in each state.
Programs at the Hydrologic Instrumentation Facility
Project: A-Pack Reel Kit Update
The project goal is to devise a new cable for the A-Pack reel to replace the no-longer-available .084 diameter cable. Since it was designed in 1957, the A-Pack sounding reel has used .084 diameter sounding cable. Some years ago, the manufacturer stopped making this cable. The USGS bought a large spool of the cable, and it was a slow-selling item, so the day we ran out was postponed for a number of years. However, that day finally arrived. There is no more .084 diameter cable, and no more to be obtained. The obvious thing to do is to replace the .084 cable with the .101 diameter cable used on the A-55 and B-56 reels. This first requires machining the drum of the A-pack reel to make it slightly smaller, so that when the thicker cable is installed, it will still pay out 1 foot of cable for each turn of the drum. Also, the levelwinding sheave has to be reworked to guide the thicker cable. Next, an update to the cable assembly is in order, removing the old specially-made stainless steel sleeves that capture the ends of the armored cable, and making a new design that uses adhesive-lined heat-shrink tube. The updated cable also features a more secure attachment for the electrical terminals at each end of the cable. Add to this the need to incorporate a breakaway system into the updated design.