NASA/Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135

A -- WATER FLOW CONTROL ASSEMBLY SOL RFO3-105742 DUE 070699 POC Jane M. Cochran, Contracting Officer, Phone (216) 433-2739, Fax (216) 433-2480, Email Jane.M.Cochran@grc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/GRC/date.html#RFO3-105742. E-MAIL: Jane M. Cochran, Jane.M.Cochran@grc.nasa.gov. PART I SPECIAL NOTICE: The due date for proposals is extended by two weeks, from Monday June 21, 1999 to Tuesday July 6, 1999. PART II Responses to RFO Questions 1. Cleaning requirement is per MIL-STD-1246 and per SSP30573. What cleaning level and what NVR level is invoked? Can NASA streamline this and specify only one specification? ANSWER: The valve assembly shall be capable of operating with cooling water in accordance with SSP30573B, Table 4.1-2.8 for flight units or Table 4.1-2.17 for qualification units only. The unit may be tested with gaseous helium in accordance with SSP30573B, Table 4.1-2.9 or gaseous nitrogen in accordance with SSP30573B, Table 4.1-2.13, Grade A or better. No materials shall be used which tend to react with these fluids at any of the specified operating or ambient temperatures or pressures. This includes any materials that would come in contact with the fluids after a credible, single-barrier failure, such as leakage past soft goods or metal-to-metal (non-welded) joints. Wetted surfaces of the valve assembly shall be cleaned according to SN-C-0005D, Level 100A. Exterior surfaces of the assembly shall be Visibly Clean according to SN-C-0005D. 2. Specification page 6 states that "Each unit (Units A & B) shall be qualified and acceptance Tested per SSP41172". What classification is applicable for the testing (refer to Table 4-1 and Table 5-1 of SSP 41172 Rev. B on page 4-2 and 5-2) ? ANSWER: "Fluid or Propulsion Equipment" is the applicable classification. 3. Reliability requirement is to be 250,000 hours operating MTBCF. How are we required to verify compliance to this requirement (by Analysis or other means)? Is this requirement applicable to individual components or to the system? ANSWER: Compliance to the reliability requirement shall be by Testing and/or Analysis. Accelerated life test techniques shall be used where practical. The reliability requirement applicable to the WFCA system. 4. I didn't see any Documentation requirements list. Will there be any documentation deliverables? ANSWER: An Acceptance Data Package (ADP) shall be shipped with each contract end item. Each ADP shall contain the following: a. Top-level assembly drawing(s) and an interface control drawing. b. All test results/reports and inspection records for each piece of hardware and/or material manufactured. c. Material Certifications -- The Seller shall provide a Certificate of Compliance signed by a responsible Quality representative of the company to the effect that all materials, processes, and/or finished items supplied under this Purchase Order (PO) are as specified. The certificate must be typed and include part number and date code(s). d. The Seller shall provide in writing (typed) the start date, shelf life, and expiration date of all life limited shelf items supplied under this PO. The supplied items must have at least 75% of their useful shelf life remaining at time of shipment to NASA. e. A copy of the Quality Requirements. 5. Page 6 of the spec. says "Certification papers shall be provided." Please explain. ANSWER: See answer to Question 4. 6. Will there be a requirement for a PDR/CDR and if yes, will the customer community be participants? ANSWER: There is no requirement for a PDR/CDR but if the supplier has reviews, NASA would like to participate. 7. Specification mentions requirements for qualification testing but delivery schedule does not. Is successful completion of qualification required before first delivery? Can qualification units be refurbished and delivered as flight units? ANSWER: Yes, successful completion of qualification testing is required before the first delivery. No, qualification cannot be refurbished and delivered as flight units. 8. Seems to be no requirements for program reviews and/ or milestone reports. Is this correct? ANSWER: There are no requirements for program reviews and/or milestone reports. 9. All delivery requirements are specified as Months ARO except for (4) unit B items which have a delivery date of May 1, 2001 (page 6 of specification). Is this correct? ANSWER: Yes, it is correct that all delivery requirements are specified as Months ARO except for (4) unit B items that have a delivery date of May 1, 2001. 10. Will the 6-piece option be executed at the same time as the 32 pieces? ANSWER: No. The 6-piece option will not be executed at the same time as the 32 pieces. 11. Throttle Capability requirement (page 3 of specification) calls for +/- 3 lbm/hr. What is the system delta p range? ANSWER: The maximum operating pressure of the system is 100 psia and the Maximum delta pressure is 10 psia. 12. Power interface requirement is 28 +/- 10% (page 4 of specification). Is this the primary power or secondary power? Is the power connected to chassis ground? ANSWER: 28VDC is the voltage available to power the unit. Although the 28VDC return line is connected to the chassis ground, this return line at the valve or controller must not be connected to chassis and must be isolated from chassis by a minimum of 1 Megohm. If a "secondary" voltage is developed within the valve controller unit, and this secondary voltage return is isolated from the 28 VDC return by greater than 1 Megohm, (by using an isolated DC/DC converter for example) then the secondary voltage output from the DC/DC converter must be connected to chassis ground at one point only. The goal is to prevent any structure from being used as a current return path, except for fault conditions. 13. Data Interface, Command Set point is 0 to +10vdc (page 4 of specification). Can current disable threshold limit and maximum current threshold be specified? ANSWER: Suggest that the setpoint range be from 0 to 8 volts and the other Modes be as follows: VALVE OPEN 9.8 to 10V VALVE CLOSED 9.4 to 9.6V HOLD MODE 8.9 to 9.1V This also makes the modes easy to remember as 9V for hold, 9.5V for closed, and "around 10V" for full open. Also, the hold mode is between closed mode and the setpoint range for faster response under normal operating conditions. 14. Soldering specification MSFC-P09.1-C06 seems incorrect (page 4 of specification). Please clarify. ANSWER: MSFC-STD-2903, which is the tailoring guide for NASA-STD-8739.3A, is the appropriate document for soldering. 15. Burn In/Cycling requirement (page 4 of specification) does not specify operating temperatures. Please clarify. ANSWER: Burn In/Cycling operating temperatures are 15 to 50 degrees C. 16. Page 6 of specification states "Each unit meet all requirements after 5 launch cycles". Please define "5 launch cycles". ANSWER: "5 launch cycles" means being exposed 5 times to the vibration and thermal environments listed. 17. Do EMC requirements (page 5 of the specification) apply to individual components or to system? ANSWER: The EMI/EMC requirements on page 5 of the specification apply to "black boxes" or assemblies, not to individual components. 18. While reviewing the assembly's requirements I have discovered that the valve is required to fail open at 25 lbm/hr and must flow 300 lbm/hr at its greatest flow point yet be able to have full shut-off capability. The controller specification states that at zero VDC the valve must be flowing 25 lbm/hr and at 10 VDC the valve must be flowing 300 Lbm/hr. At what voltage should the valve be fully closed? ANSWER: Suggest that the setpoint range be from 0 to 8 volts and the other modes be as follows: VALVE OPEN 9.8 to 10V VALVE CLOSED 9.4 to 9.6V HOLD MODE 8.9 to 9.1V This also makes the modes easy to remember as 9V for hold, 9.5V for closed, and "around 10V" for full open. Also, the hold mode is between closed mode and the setpoint range for faster response under normal operating conditions. 19. Is an instance of decreasing flow upon impending full shut-off acceptable? ANSWER: An instance of decreasing flow upon impending full shut-off is acceptable. 20. Is a design that requires only a relatively simple controller acceptable? ANSWER: A simple design is acceptable. 21. Do you have any additional information regarding Fluoroloy G seals? I am unfamiliar with this terminology. ANSWER: Fluoroloy G is a virgin unfilled PTFE (a UHMW polymer), which is good from minus 65 to 275 degrees F. The company name is now the Furon Company. A good contact is Ed Hillery at 1-800-544-0080 22. How many copies of the proposal should be submitted? ANSWER: The Government requires 4 copies of the proposal. Please mail them to the following address: NASA Glenn Research Center, Attn: Jane M. Cochran, Mail Stop 500-319, 21000 Brookpark Road, Cleveland, OH 44135 23. What type of contract will be awarded? ANSWER: The Government expects to award a fixed-price contract as a result of this solicitation. PART III SPECIAL NOTICE: The RFO is changed in three places as indicated by the reprinted text, below: The following is a description of the procurement: FLIGHT HARDWARE, WATER FLOW CONTROL ASSEMBLY (WFCA) ORBITAL REPLACEMENT UNIT (ORU) -- UNITS (A) & (B) The WFCA ORU is an assembly within the FLUIDS & COMBUSTION FACILITY (FCF) WATER THERMAL CONTROL SUBSYSTEM (WTCS) that will control and monitor water that flows through the racks. The Government will make a selection from Option #1 or Option #2, as described below, or combination of Options 1 and 2 which the Government deems in its best interest. OPTION #1 The WFCA shall consist of the following subassemblies: 1. Subassembly #1 (UNITS A & B): 7 FLOW CONTROL VALVE (changed from "VALVE -- Solenoid Flow Control Valve") 7 FLOW SENSOR (changed to delete reference to "Differential Flow Pressure Transducer") 2. Subassembly #2 (UNITS A & B): 7 Valve Controller 7 Cable The two subassemblies shall be separate from each other and be able to be mounted at different areas of the Rack. The two subassemblies shall be connected together with the cable. See attached drawing #1 for details. Subassembly #1 envelope & mounting provisions shall be per attached drawing #2A Subassembly #2 envelope & mounting provisions shall be per attached drawing #3 The Fluid Quick Disconnects (QDs) shall be procured and installed by NASA. (Drawings #1 & #2 include QDs). The water interface with the WFCA shall be either a 1/2 inch (-08) and/or a 3/8 inch (-06) boss per MS33649 or MS16142. The Fluid Quick Disconnects shall be provided for assembly testing if needed. OPTION #2 The WFCA shall consist of the following: 1. Subassembly #1 (UNITS A & B): 7 FLOW CONTROL VALVE (changed from "VALVE -- Solenoid Flow Control Valve") 2. Subassembly #2 (UNITS A & B): 7 Valve Controller 7 Cable The two subassemblies shall be separate from each other and be able to be mounted at different areas of the Rack. The two subassemblies shall be connected together with the cable. See attached drawing #1 for details. Subassembly #1 envelope & mounting provisions shall be per attached drawing #2B, as a KIT to be integrated by customer. Subassembly #2 envelope & mounting provisions shall be per attached drawing #3 The FLOW SENSOR (changed to delete the following phrase -- "Differential Flow Pressure Transducer") shall be procured and installed by NASA. All testing of subassemblies #1 & #2 will be done with the FLOW SENSOR provided by NASA as Government Furnished Equipment (GFE). The Fluid Quick Disconnects (QDs) shall be procured and installed by NASA. (Drawings #1 & #2 include QDs). The water interface with the WFCA shall be either a 1/2 inch (-08) and/or a 3/8 inch (-06) boss per MS33649 or MS16142. The Fluid Quick Disconnects shall be provided for assembly testing if needed. Posted 06/16/99 (D-SN343826). (0167)

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