MODIFICATION
66 -- COLD SHROUD
- Notice Date
- 5/1/2002
- Notice Type
- Modification
- Contracting Office
- NASA/George C. Marshall Space Flight Center, Procurement Office, Marshall Space Flight Center, AL 35812
- ZIP Code
- 35812
- Solicitation Number
- 8-1-1-S7-D6602
- Response Due
- 5/2/2002
- Archive Date
- 5/1/2003
- Point of Contact
- Bobby J. Holden, Contract Specialist, Phone (256) 544-5417, Fax (256) 544-9354, Email Bobby.Holden@msfc.nasa.gov - Monica D. Heidelberg, Contract Specialist, Phone (256) 544-2373, Fax (256) 544-6488, Email monica.heidelberg@msfc.nasa.gov
- E-Mail Address
-
Email your questions to Bobby J. Holden
(Bobby.Holden@msfc.nasa.gov)
- Description
- This is a modification to the synopsis entitled COLD SHROUD, SOLICITATION NO. 8-1-1-S7-D6602 which was posted on APRIL 1, 2002. This amendment is to post answers to questions that were received from potential offerors: (1) QUESTION RECEIVED: Do you really mean the cylinder is to be made from and extrusion We think the cylinder should be made from a roll-up using 3/16" plate. RESPONSE RECEIVED: The roll-up 3/16 plate would be fine. (2) QUESTION RECEIVED: The original specifications state the shroud shall be made in two sections each one 45" long. The drawing shows a one-piece construction. Which is correct? RESPONSE RECEIVED: One-piece contruction would be best. (3) QUESTION RECEIVED: If there are two sections, then the coolant line must be broken. Are the coolant lines to the joined by 3-3/8" conflat flanges? There is not sufficient room to connect outside the shroud: 48" I.D. chamber less 42-3/8" O.D. shroud only leaves 2.8" on each side, The coolant lines are only 1" therefore, 2-1/8" conflats would be large enough to make the connection. OK? RESPONSE RECEIVED: No two sections. (4) QUESTION RECEIVED: The changes indicate only the end plates are actively cooled. Is this correct? RESPONSE RECEIVED: The end plates (i.e. 42" diameter) and 90" shroud body need to be actively cooled. Not the cover plates that cover the hole openings on the shroud or end plates. (5) QUESTION RECEIVED: Is aluminum plate permitted with attached ?D? tube in lieu of extrusion to form the cylinder shroud section as well as the ends of the shroud? The shroud drawing seems to show a plate for the cylinder section rather that a grouping of extrusions. RESPONSE RECEIVED: We actually want ?D? tubing attached to aluminum plate. In the order of 1+? OD, with ?? ID. (6) QUESTION RECEIVED: What are the required heat loads for the shroud? RESPONSE RECEIVED: TBD (7) QUESTION RECEIVED: What is the flow, its properties, and allowable pressure drop through the shroud? RESPONSE RECEIVED: The cooling available is 1kW @ 20 degrees Kelvin, the flow is 21 grams/second. (8) QUESTION RECEIVED: What is the temperature uniformity requirement if any of the shroud? RESPONSE RECEIVED: The refrigerator outlet temp is 10 degrees Kelvin with a return temperature of 15 degrees Kelvin. (9) QUESTION RECEIVED: What is the width of the extrusions specified if these extrusions are mandatory? RESPONSE RECEIVED: The extrusions is not mandatory. (10) QUESTION RECEIVED: Is there a specification for the maximum temperature of the shroud between the cooling tubes? If so, what is that temperature? RESPONSE RECEIVED: No. (11) QUESTION RECEIVED: How many cooling tubes are there on the shroud? Only the inlet and outlet are shown. RESPONSE RECEIVED: Approximately 10 tubes at 36 degrees apart. The cooling path will need to mate to our existing inlet and outlet. They are 3 3/8" conflats. (12) QUESTION RECEIVED: What is the anticipated heat load on the shroud? How much of that load isto be associated with the shroud support? RESPONSE RECEIVED: TBD (13) QUESTION RECEIVED: The source of cooling is a helium refrigerator. What is the anticipated coolant inlet? Outlet temperature? What is the flow? the delta T or cooling available? RESPONSE RECEIVED: The output of the refrigerator will 10 degrees Kelvin and return will be 15 degrees Kelvin. The cooling available is 1kW @ 20K. (14) QUESTION RECEIVED: The original solicitation referred to a drawing of the shroud support points and cooling path. The drawings I received had no information about the cooling paths. Is there to be another drawing showing the cooling path? Is there a preferred spacing of the cooling tubes? RESPONSE RECEIVED: We really don't care what the flow path follows. Best design per chamber drawing, shroud dimensions and inlet & outlet locations. (15) QUESTION RECEIVED: Will there be better drawings of the chamber available or should the potential supplier include a visit to the facility to take measurements? If so, where is the chamber located and is access available? RESPONSE RECEIVED: The drawing of the chamber and mock shroud are on the internet. A visit is welcome if the vendor would like to see the existing chamber. (16) QUESTION RECEIVED: An interior coating of black paint has been added to the shroud. Can you supply a suggested source for this material? RESPONSE RECEIVED: Johnson Supply Co., 50 South East Street, PO Box 449, Pensacola FL 32592, (850)434-7103. Part number 463-3-8 with CA 118, Flat black Epoxy topcoat and TL-29 thinner. (17) QUESTION RECEIVED: Item 8 of your additions refers to an additional evacuation port and additional supply and return ports are to be added to the shield. These are 1/2" VCR. Can you clarify? What are these fittings attached to? Is it to the cooling shroud or the cooling tubes? Or both? One implies to the shroud while the other seems to be to the cooling. Is there a schematic or sketch? RESPONSE RECEIVED: The additional fittings need to be attached to the cooling tube path. One fitting is for evacuating the cooling tubes. The other two are cooling a cold plate that we will use in the chamber. Therefore, the cooling tubes will need an inlet and outlet fittings. The fittings will be male 1/2" VCR. The due date for receipt of quotes is extended UNTIL MAY 9, 2002. Documents related to this procurement are available over the Internet and are in Microsoft Office 97 format and will reside on a World Wide Web (WWW) server, which may be accessed using a WWW browser application. The Internet site, or URL, for the NASA/MSFC Business Opportunities home page is http://prod.nais.nasa.gov/cgi-bin/eps/bizops.cgi?gr=CL&pin=62 Offerors are responsible for monitoring this site for the release of the solicitation and any amendments. Potential offerors are responsible for downloading their own copy of the solicitation and amendments (if any).
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