MODIFICATION
43 -- VACUUM CHAMBER SYSTEM
- Notice Date
- 6/30/2006
- Notice Type
- Modification
- NAICS
- 333911
— Pump and Pumping Equipment Manufacturing
- Contracting Office
- NASA/Goddard Space Flight Center, Code 210.M, Greenbelt, MD 20771
- ZIP Code
- 20771
- Solicitation Number
- NNG06160728L
- Response Due
- 7/7/2006
- Archive Date
- 6/30/2007
- Description
- This is a modification to the synopsis entitled Vacuum Chamber System SOLICITATION NO. NNG06160728L which was posted on June 16, 2006. You are notified that the following changes are made: This mofification is to address some Comments and Answers: 1. General: There is no functional specification, that is, base pressure or pressure-time requirement, so we assume that this system is intended for normal, unbaked UHV, and that the workpiece (reaction wheel) in itself is not sufficiently gassy to prevent achievement of low pressures. Our normal materials would be type 304ss, bead blast interior finish unless otherwise specified. Reply: The system is for normal UHV. The reaction wheel does outgas slightly, but will not prevent the system from reaching low pressures. This material listed is acceptable but not required. 2. General: We also assume that the workplace is insensitive to magnetic fields, such as those from the ion pump, or welds, and requires no specialized shielding. Reply: The reaction wheel is insensitive to the magnetic fields from the ion pump and welds. 3. Chamber: The top flange (described as "blanket", a typo, "blanked" is to be centrally-located? Reply: There was a typo in the chamber description. The top flange should be "blanked". It is not required to be centrally located. 4. Chamber: Handles. this chamber is relatively heavy. Shall we also add hoisting points? Reply: Hoisting points are acceptable but not required. 5. Base plate: Again, assume that the 8" pump port is in the center, and that the mounting plate for the workpiece is likely also central, typically on standoff? Reply: The mounting plate for the reaction wheel whould be centered in the chamber. The mounting plate must not prohibit flow from the reaction wheel to the ion pump. This may be achieved with standoffs. It is acceptable for the port for the ion pump to be centered, but it is not required. 6. Base plate: Gauge port. For two sets of gauges, one "T" isn't going to be sufficient. How about two separate 2.75" CFF for these? Reply: Two spearate 2.75" CFF for the gauges is acceptable. If that design is proposed, the total number of 2.75" CFF for the chamber must be increased by one. A "T" leading to two more "T's" is also acceptable. 7. Base plate: Gauge locations. At UHV, it would be more usual to have nude ion gauges extended directly into the vacuum chamber. Instead of tube-type around a "corner" unless best accuracy is not required, or lowest pressures are not required. Either way is fine with us. Reply: Best accuracy is not required. Lowest pressures are not required. Gauge locations as described are preferred. 8. Base plate: BNC flange. Do you perhaps mean female, both sides? Reply: Yes, this should be BNC female both sides. 9. Base plate: "D" connectors. Are internal connectors/cables needed? Reply: Internal cables are not needed. The only connectors required are those that provide access across the 6" CF as described. Connectors of the same size should be of the opposite gender to prevent potential mismating. 10. Gauges: The specified brand and model of gauge does not operate ion(BA) gauge types. It operates a cold cathode (CC) gauge; however, there is a CC sensor version good to 10EE-10 Torr. The MM 200 operates ion gauges. We strongly suggest ion gauges for long-term accuracy. Reply: Based on the input, the specific gauge controller in the description does not have to be used. Convection gauges and ion gauges are required per the description. 11. Gate valve: We assume metal face seal in this application unless told otherwise. Reply: The gate valve seal should be appropriate for this application. 12. Control panel: since all valves are manual, and this type of system is generally cycled infrequently, a control system per se is not needed, and no interlocks or alarms are specified, however, your local requirements may demand an EMO (emergency off button) or even two and possibly some sort of alarm based on test interruption, etc. Reply: Automatic shut-off is required as described. Emergency off buttons are not required. 13. Roughing pump: This is not specified at all. We are to assume that this is going to be a customer - side addition? If so, do we provide interlocks and controls? A mounting location? Reply: The roughing pump is customer supplied. The hardware is already on hand to connect it to the system as the system is described. 14. Ion pump: Arrangement and compatibility. The equivalent to a 300 1/s pump with internal TSP is the Varian Vac Ion Plus Combination pump on an 8" CFF. Its (ion part only) speed is 300 l/s only in the diode version. In order to ensure compatibility with your existing PE controller and pump, we need to know if you have a diode or triode arrangement and that you are really asking for a TSP built into the pump body. Other, possibly more economical options are available if the TSP is separate from the pump, for example, in the chamber. Reply: The TSP is to be built into the pump. Our existing system has a diode arrangement. The due date for responses is not extended. Documents related to this procurement will be available over the Internet. These documents 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/GSFC Business Opportunities home page is http://prod.nais.nasa.gov/cgi-bin/eps/bizops.cgi?gr=D&pin=51 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). [INSERT ANY APPLICABLE NOTES]
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