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66 -- SEALED WATER, CESIUM AND SODIUM HEAT PIPES SOL 53SBNB060161 DUE 090500 POC TAMARA GRINSPON, Contract Specialist, (301) 975-4390; Paul G. Cataldo, Contracting Officer, (301) 975-6332 WEB: NIST Contracts Homepage, http://www.nist.gov/admin/od/contract/contract.htm. E-MAIL: NIST Contracts Office, Contract@nist.gov. This is an AMENDMENT to the Combined Synopsis/Solicitation #53SBNB060161, for SEALED WATER, CESIUM AND SODIUM HEAT PIPES, that was originally transmitted to the Commerce Business Daily on 8/15/00, under Submission No. 486099.**********The Solicitation is hereby amended as follows: (I) The geometry previously listed for item #1 in the original specifications is now being used, as well, for items #2 and #3. The specifications are therefore amended to read: (1) HP-1, a water heat pipe, operating in the temperature range of at least 330 Kelvin to 520 Kelvin. The geometry of the HP-1 shall be the following: external diameter of 75 +/- 1 mm, total length of 300 mm. Front flange of HP-1 shall contain a working cavity in the form of a cylindrical insert with inner diameter of 40 +/- 1 mm, conical bottom with full apex angle of 110 degrees, and total internal depth of insert of 240 mm. Rear flange HP-1 shall be equipped with 2 thermometer wells (thermowells) with total length of 260 mm and internal diameter of 7 mm. Through the specified temperature range, the thermowells shall be able to accommodate temperature sensors with sheath having outer diameter of 6.5 mm. The heat pipe shall have temperature non-uniformity along the thermowells and rear half of the inserts not to exceed 25 mK.*****(2) HP-2, a cesium heat pipe, operating at normal atmosphere in the temperature range at of least 570 K to 870 K. The geometry of the HP-2 shall be the following: external diameter of 75 +/- 1 mm, total length of 300 mm. Front flange of HP-1 shall contain a working cavity in the form of a cylindrical insert with inner diameter of 40 +/- 1 mm, conical bottom with full apex angle of 110 degrees, and total internal depth of insert of 240 mm. Rear flange of HP-2 shall be equipped with 2 thermowells, with total length of 260 mm and internal diameter 7 mm. The surface of the insert shall be oxidized by annealing at normal atmosphere and temperature of 1350 K for 20 hours. Over the whole specified temperature range, thermowells shall beable to accommodate temperature sensors with sheath having outer diameter of 6.5 mm. The heat pipe shall have temperature non-uniformity along the thermowells and rear half of the inserts not to exceed 25 mK.*****(3) HP-3, a sodium heat pipe, operating at normal atmosphere in the range of at least 830 to 1340 K temperature range. The geometry of the HP-1 shall be the following: external diameter of 75 +/- 1 mm, total length of 300 mm. Front flange of HP-1 shall contain a working cavity in the form of a cylindrical insert with inner diameter of 40 +/- 1 mm, conical bottom with full apex angle of 110 degrees, and total internal depth of insert of 240 mm. The surface of the insert shall be oxidized by annealing at normal atmosphere and temperature of 1350 K for 20 hours. Rear flange of HP-3 shall be equipped with 2 thermowells, with total length of 260 mm and internal diameter of 7 mm. Through specified temperature range, thermowells shall be able to accommodate temperature sensors with a sheath having outer diameter of 6.5 mm. The heat pipe shall have temperature non-uniformity along the thermowells and rear half of the inserts not to exceed 25 mK.*****All three heat pipes shall be covered by a manufacturer's warranty for one (1) year or one thousand (1000) hours of operation at maximal temperature.**********and (II) The due date for receipt of quotation packages is hereby extended from 8/29/00 to 9/5/00, 3:00pm Eastern Standard Time. ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED AND IN FULL FORCE AND EFFECT. Posted 08/28/00 (W-SN490958). (0241)

Loren Data Corp. http://www.ld.com (SYN# 0258 20000830\66-0002.SOL)

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