Arnold Engineering Development Center, ATTN: AEDC PKP, 100 Kindel Drive, Suite A332, Arnold AFB, TN 37389-1332

66 -- LIQUID LEVEL MEASUREMENT SYSTEMS FOR LIQUID OXYGEN AND LIQUID HY DROGEN DEWARS DUE 051595 POC Lynn Jefferies, Contracting Officer, (615)454-5174. Arnold Engineering Development Center (AEDC), Arnold Air Force Station, Tennessee, is seeking prospective offerors capable of supplying two discrete liquid level measurement systems, one of which is to be used in a liquid oxygen (LOX) dewar, the other in a liquid hydrogen (LH2) dewar. Each of the two proposed measurement systems would have a minimum of ten steps to measure the level of liquid in each of the respective dewars, with a flange attachment at the top and a receiver pipe at the bottom, with total weight being supported at the top. The measurement height in the LOX dewar is approximately 12.5 ft (LOX dewar is 4,000-gallon size with dimensions of 108'' OD and 90'' ID, overall height of 272''). The measurement height in the LH2 dewar is approximately 24 ft (LH2 dewar is 10,000-gallon size with dimensions of 132'' OD and 114'' ID, overall height of 394''). Each of the proposed measurement devices should be capable of meeting the following requirements: accurate to within plus or minus 1/16'' of actual level; operate at pressures up to 200 psig without false readings; equipped with two individual fast response contact outputs (10 milliseconds or less) rated at 28 VDC and greater than or equal to 500 ma; discrete level indication at the dewar and at the signal conditioners with remote signals (less than 5VDC) for a Data Recording System; signal conditioners to be located approximately 500 ft from each dewar with the remote signal being transmitted up to 1500 ft from the conditioners; safety standards consistent with NFPA Class I, Division 1, Group B. In addition, the system for the LOX dewar must be capable of meeting the following cleanliness standards: solid particle contamination per square foot of significant surface shall have no particle greater than 500 microns in any direction; and, the maximum non-volatile residue (NVR) shall not exceed 1 milligram per square foot of significant surface. The contractor would also supply the following parts of the measurement systems: sensors, mounting mechanism and flange, as well as the wiring to the feed-through disconnects at the flange, 19'' rack-mountable signal conditioners and the interconnect requirements from the disconnects to the conditioners. If this interconnect is non-standard, the interconnect would also be supplied. AEDC anticipates soliciting and awarding a firm fixed price contract in FY 1995. The proposed contract would include furnishing and installation (to include on-site check-out and calibration) of these two liquid level measurement systems. The proposed procurement would be unrestricted. Any firm capable of supplying the proposed system should respond in writing and request to be placed on the source list. Firms are encouraged to submit technical comments or questions. (0096)

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