NASA/George C. Marshall Space Flight Center, Procurement Office, Marshall Space Flight Center, AL 35812

43 -- ROOTS BLOWER VACUUM PUMP SOL 8-1-8-06-B8121 DUE 030498 POC June N. Blackwell, Contract Specialist, Phone (205) 544-0351, Fax (205) 961-0059, Email june.blackwell@msfc.nasa.gov -- Michael R. Sosebee, Contracting Officer, Phone (205) 544-0415, Fax (205) 544-9080, Email mike.sosebee@msfc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/MSFC/date.html#8-1-8-06-B8121. E-MAIL: June N. Blackwell, june.blackwell@msfc.nasa.gov. THIS NOTICE CONSTITUTES AMENDMENT NO. 1 TO THE COMBINED SYNOPSIS/RFQ FOR A ROOTS BLOWER VACUUM PUMP TO REPLACE EXISTING PUMP. Companies shall acknowledge all amendment(s) in their quote. This notice serves as the official amendment to subject synopsis/RFQ and a written amendment will not be issued. The purpose of this amendment is to add additional specs. SPECIFICATIONS: NSN = 4310 QUANTITY = 1 High Vacuum Pump, Manufactured by Roots Connerville, Type R.G.S. HVB, Size 10x16, Roots Blower Serial No. 30649. No tubing or fittings are needed at this time. The boosters are pumping on atmospheric air, to help form a high vacuum for the thermal chamber. The RGS High Vacuum Booster is a continuous-duty, vacuum-tight unit. It may be driven directly or by belt within limits. These boosters are suitable for handling vapors (air in this case) under conditions where the vapors do not condense in the booster. Gross Displacement = 3951 cfm Max. pumping speed = 1800 rpm Max. pressure rise = 563 mm Hg Driving mechanism= V belt Measured from bolt holes = 20.5" length x 23" width From foot to drive shaft = 14.5" Height = 35.625 The unit is required to meet the following tests: CLEARANCES AND SEAL INSPECTION: All clearances are to be determined and recorded before testing. There are to be within the specified tolerances. All seal housings are to be absolutely dry before the unit is run. After a successful mechanical test run has been complete, the seal housings should be rechecked. The larger boosters may have a maximum seal leakage of 6 drops per seal per hour. LEAK TEST: All units are to be leak free as determined by the HALIDE LEAK TEST or submerged leak test. Leak rate at blankoff with roughing pump line closed and with booster running is to be 90 microns per hour between 0.5 and 5 microns booster inlet pressure. SLIP AND MECHANICAL TESTS: The 1 PSI slip is to be determined and recorded before testing. The mechanical test lasts for one hour after stabilization at specified conditions. BLANKOFF TEST: All units are to be run at blankoff conditions for a minimum period of two hours. The maximum blankoff pressure must not exceed 0.5 micron of mercury absolute; as measured by an untrapped McLeod Gauge. The due date for receipt of offers is extended to March 4, 1998. Companies shall provide the information stated in the synopsis/RFQ posted on the NASA Acquisition Internet Service (NAIS) by COB March 4, 1998. Documents related to this procurement are available over the Internet and are in Microsoft Office Suite (Word 6.0, Excel 5.0, or PowerPoint 4.0) format and reside on the World Wide Web (WWW) server which may be accessed using a WWW browser application. The WWW address or URL of the NASA/MSFC Business Opportunities home page is http://procurement.nasa.gov/EPS/MSFC/class.html. (0058)

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