Specificaiton for Large Diameter Flex Duct Bellows.pdf
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This is a specification document for the procurement of large diameter flex duct bellows assemblies for the Arnold Engineering Development Complex at Arnold Air Force Base, Tennessee.
The specification requires the contractor to provide two (2) flex duct bellows assemblies with a 45.315-inch internal diameter, fabricated in accordance with Drawing RJ632279.18 and delivered to Arnold AFB, Tennessee 37389. The assemblies must be manufactured per EJMA Standards and ASME Boiler and Pressure Vessel Code (without Code-stamp requirement). Bellows material shall be silicone-coated 1523 fiberglass, 6-ply body, 0.12 inches thick nominal. Design parameters include working pressure of 30 psid internal and 15 psid external, temperature range of -60°F to +450°F, test pressure of 45 psig at 70°F, length flexibility of ±0.375 inch, and radial flexibility of ±0.25 inch. Welds must conform to AWS D1.1 Structural Welding Code-Steel. The contractor must ensure the cavity between bellows and rings is clean and free of foreign materials including weld slag, splatter, and metal shavings. Required documentation includes visual inspection reports, weld inspection reports, pressure test inspection reports, axial spring rate calculations and test results, and standard manufacturer warranty. Assemblies shall be hydrostatically tested to 45 psig at 70°F per ASME standards, with welds inspected per AWS D1.1, and spring rate performance tested in the axial direction. The contractor is responsible for all transportation, cribbing, tie-downs, and weather protection to ensure safe delivery.
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Text version
14999-27-901
SPEC. No 14999-27-901 30 October 2026
SPECIFICATION FOR
LARGE DIAMETER FLEX DUCT BELLOWS ASSEMBLY
ARNOLD ENGINEERING DEVELOPMENT COMPLEX
ARNOLD AIR FORCE BASE, TENNESSEE 37389
DISTRIBUTION STATEMENT A
Approved for Public Release: Distribution Unlimited
IRA-26-2111
IRA-26-2111
1.0 SCOPE
Provide two (2) 45.315-inch internal diameter flex duct bellow assemblies in accordance with Drawing RJ632279.18. The Contractor shall deliver the assemblies to Arnold AFB, Tennessee, 37389.
2.0 APPLICABLE DOCUMENTS
2.1 Government Documents: Not applicable.
2.2 Non-Government Documents:
2.2.1 American Society of Mechanical Engineers (ASME):
A. ASME B31.3, Ch. VII Nonmetallic Piping and Piping Lined With Nonmetals
2.2.2 American Welding Society (AWS):
A. AWS D1.1 Structural Welding Code-Steel
2.2.3 Expansion Joint Manufacturer’s Association (latest publication):
A. EJMA Standards Expansion Joint Manufacturers Association, Inc.
3.0 REQUIREMENTS
3.1 The flex duct bellows assemblies shall be fabricated in accordance with EJMA Standards and ASME Boiler and Pressure Vessel Code per Drawing RJ632279.18 (see Appendix A). Note: Boiler and Pressure Vessel Code-stamp is not required.
3.2 Welds shall conform to AWS D1.1.
3.3 Bellows material shall be silicone-coated 1523 fiberglass, 6-ply body, 0.12 inches thick (nominal). The Contractor shall submit all proposed material substitutions or other deviations from this specification to the Government for approval.
3.4 Bellows assemblies shall conform to the following design parameters:
A. Working Pressure: 30 psid Internal, 15 psid External B. Temperate Range: -60°F to +450°F C. Test Pressure: 45 psig at 70 °F D. Length Flexibility: ±0.375 inch E. Radial Flexibility: ±0.25 inch
3.5 Cleanliness: The Contractor shall ensure the cavity between the bellows and the rings is clean and free of all foreign materials including but not limited to weld slag and splatter and metal shavings.
IRA-26-2111
3.6 Documentation:
3.6.1 Provide the following documentation with delivery of the assemblies:
3.6.1.1 Visual inspection report.
3.6.1.2 Weld inspection report.
3.6.1.3 Pressure test inspection report.
3.6.1.4 Axial spring rate calculation and test results.
3.6.1.5 Standard Manufacturer Warranty.
4.0 VERIFICATION AND TESTING
4.1. Assemblies shall be hydrostatically tested to 45 psig at 70 °F per ASME Boiler and Pressure Vessel Code.
4.2. Welds shall be inspection per AWS D1.1.
4.3. Assemblies spring rate in the axial direction shall be calculated and performance tested.
5.0 PACKING AND SHIPPING
5.1.1. The Contractor shall be responsible for all transportation and shall provide all supports, cribbing, tie downs and weather protection to ensure safe delivery.
END OF SPECIFICATION
IRA-26-2111
APPENDIX A - Drawing RJ632279.18
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