SATPC0042859 Tab 10 4 Questions.pdf
PDF 120 KB Posted
- Attached to
- Dome Loaded Regulator
- Solicitation number
- 80NSSC27944860Q
About this file
This is a Questions and Answers document providing clarifications on a Request for Quote (RFQ) for a pressure regulator system.
The procurement requires one regulator unit with one set of spare soft goods, equipped with 4-inch Grayloc 4GR31 hubs on both ends. Compliance is evaluated solely against the Statement of Work requirements with no specific brand name or equal-to reference model mandated. The regulator must achieve a minimum Cv of 80 and flow rate of 80 pounds mass per second of gaseous nitrogen at 4,000 PSIG inlet and outlet pressures, with the Cv serving as the controlling parameter. The regulator must maintain pressure stability of less than 0.1 PSIG per 100 PSIG and undergo testing per ASME B31.3 standards for proof and burst pressures, with test reports required for all pressure-containing parts. Acceptable cleanliness levels are commercial clean as standard, with an optional CLIN available for 400A cleanliness per RPTSTD-8070-0001. The test medium is ambient nitrogen gas. Required documentation includes proof and burst test certifications, Material Test Reports (MTRs) for all pressure-containing parts, and NASA-provided acceptance test procedures post-award. Acceptance testing encompasses three functional pressure test ranges with specifications for external leakage (zero leakage over 2 minutes at 6000 PSI), internal leakage (not exceeding 10 SCCM over 2 minutes), and functional lockup at plus or minus 2 percent of set outlet pressure at 1000, 3000, and 5000 PSI. Clamps and seal rings may be quoted as optional CLINs. Custom-engineered regulators are acceptable.
View the file
Other files
| File | Type | Posted |
|---|---|---|
| SATPC0042859 Tab 10 4 Questions.pdf | ||
| SATPC0042859 Tab 04 4 SOW.pdf | ||
| SATPC0042859 Tab 10 1 RFQ.pdf |
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
We received some questions regarding this regulator. Please let me know how we should respond.
Good morning Ms. Wilson, Starpoint Prime LLC respectfully requests clarification on the following:
1.What quantity of regulators and spare soft-goods sets is required? 1 regulator, 1 set of spare soft goods.
2. The RFQ states “Brand Name or Equal To,” but no manufacturer or model is identified. Is there a reference model, or will compliance be evaluated solely against the SOW? No brand name or equal to, meeting the requirements of the SOW will suƯice.
3. Please confirm that Cv 80 minimum and 80 lbm/sec GN2 are correct. At what inlet pressure, outlet pressure, and temperature must the regulator achieve that flow? This is correct, the flow rates are referenced at 4,000 PSIG inlet, 4,000 PSIG outlet. (Note: the Cv is the controlling parameter, the flowrate number is a calculated quantity based on the Cv. NASA can potentially take some exceptions to the flowrate.)
4. Are 4-inch Grayloc 4GR31 hubs required on both ends, and must the regulator include the clamps and seal rings? Yes - 4GR31 hubs on both ends. You can quote with the clamps and seal rings as an optional CLIN but not required to per the SOW.
5. What ASME code, proof-test pressure, burst-test pressure, test medium, and acceptance criteria apply? Reference ASME B31.3 for proof and burst pressure, test reports for all pressure containing parts must be provided. NASA will provide an acceptance test procedure after contract award. It will entail flowing, at minimum, the three pressure test ranges listed in the SOW.
6. Please define the required pressure stability and leakage limits, operating-temperature and cleanliness requirements, and required certification/test documentation.
Commercial clean is acceptable, but a clean level to 400A per RPTSTD-8070-0001 (attached) can be quoted as an optional CLIN.
Pressure stability requirement is <0.1 psig per 100 psig.
Temperature and fluid media is ambient nitrogen (GN2).
Proof and burst test documentation per ASME B31.3.
MTR's for all pressure containing parts.
Documentation identifying test method, test fluid, pressures, temperature, duration, and any observed defects
External Leakage Test (Media: GN2)
Load inlet to 6000 PSI. With downstream shutoƯ valve in closed position slowly load dome to 6000 PSI.
Test: No external leakage allowed over a 2 minute period.
Internal Leakage Test (Media: GN2)
Load inlet port to 6000 PSI. Attach a ¼" tube to outlet port and submerge 1/8" to 1/4" underwater.
Test: Leakage not to exceed 10 SCCM (67 bubbles/minute) over a 2 minute period
Functional Test (Media: GN2)
Load inlet to 6000 PSI. With downstream shutoƯ valve in closed position apply pressure to dome port until outlet reaches 1000 PSI. Open downstream shutoƯ valve and allow moderate flow. Close downstream shutoƯ valve.
Test: Outlet to lockup at +/- 2% of set outlet pressure.
Repeat at 3000 PSI and 5000 PSI outlet pressure.
Please also confirm whether a custom-engineered regulator is acceptable. A custom engineered regulator is acceptable.
File details come from the government source that posted it. Updated .