Tube and Tube Fittings, Nickel-Chromium-Molybdenum Alloy

Scope Description	Tube lengths and tube fittings fabricated from tube lengths, Nickel-ChromiumMolybdenum Alloy, in the following inch OD (outside diameter) sizes: 1/4, 3/8, 1/2, 3/4, and 1
Material Specification	UNS N06022 Inch OD ASTM Specification 1/4, 3/8 B 622 1/2 to 1 B 622, B 626
Dimensional Specification	Inch OD Wall Thickness (Inch) 1/4, 3/8 0.035 1/2 0.049 3/4 to 1 0.065
Purchase Order	Purchase order (PO) shall specify the following: 1. Surface roughness [default: ≤ 0.6 µm (25 microinch) Ra] 2. Seamless or welded [default: seamless] 3. Certificate of Conformance requirements (See the Certification Section of this specification.)
Lengths	Tube lengths shall be 6 m (20 ft) nominal, 5.5 m (18.5 ft), minimum. Fitting linear dimensions shall be per supplier-provided drawings.
Tolerances	Acceptance Criteria Inch OD [ OD Ovality ] Quantity to be Inspected 1/4, 3/8 ± 0.004 ± 0.004 10% 1/2 to 1 ± 0.005 ± 0.005 10% Face Squareness 1/4 to 3/4 ± 0.5° 10% 1 ± 0.010 inch 10% Wall Thickness All sizes ± 10% of nominal wall thickness 10% Fitting Dimensions All sizes ± 0.8 mm (1/32 inch) linear, 10% ± 0.5° angular tolerance from dimensions on supplier drawings
Drawings	Supplier shall provide drawings that specify all dimensions of tube fittings.
Calculations	Not required
Chemical Composition	Per UNS N06022
Mechanical Strength	Per ASTM B 622 and ASTM B 626

Welding	Longitudinal seam butt welded tube to be manufactured as EFW without added filler metal. Following are seamless and welded size requirements: Inch OD Seamless/Welded 1/4, 3/8 seamless 1/2 to 1 seamless (welded optional)
Inspection	Visual Inspection: All components shall be 100% visually inspected under bright white light to verify that the internal surfaces show no sign of surface imperfections (e.g., tool marks, draw marks, scratches, pits, graininess, orange peel, hazing, weld discoloration, spots, stains, residues) or visible particulate contamination. Dimensional Inspection: Components shall be dimensionally inspected for conformance to the acceptance criteria specified in the Tolerances Section of this specification.
Testing	Parameter Acceptance Criteria Quantity Tested/Test Method Surface Finish Testing: Surface roughness ≤ 0.6 µm (25 microinch) Ra 0.5%/SEMASPEC or value specified in the PO 90120400B-STD Helium (He) Leak Testing: Inboard Leak Rate ≤ 1 x 10-9 sccs 100% of fittings with circumferential welds/ -6 Outboard Leak Rate ≤ 5 x 10-6 sccs SEMASPEC 90120391B-STD Particle Count Testing: Particles ≥ 0.20 micron 0 1 part per lot/ Particles ≥ 0.10 micron ≤ 0.036 ptc/L (1 ptc/ft3) SEMASPEC 90120390B-STD Particles ≥ 0.02 micron ≤ 0.36 ptc/L (10 ptc/ft3) Gaseous Impurity Testing: Parameter Acceptance Criteria Quantity Tested/Test Method Moisture ≤ 0.5 ppm (molar) 1 part per lot/SEMASPEC 90120397B-STD Oxygen ≤ 0.5 ppm (molar) 1 part per lot/SEMASPEC 90120398B-STD Total Hydrocarbons ≤ 0.5 ppm (molar) 1 part per lot/SEMASPEC 90120396B-STD
Examination	None
Certification	Certified Test Report per ASTM A 450/A 450M (EN 10204, Type 3.1 in Europe) from the alloy-producing mill shall be submitted for each mill heat utilized. Certificate of Conformance: A Certificate of Conformance shall be submitted with each shipment of purchased components. The certificate shall include supplier verification that components conform to specification requirements. For all orders, certificate shall include verification of the following: • Helium leak testing performed on 100% of welded components • Visual Inspection performed on 100% of components • Dimensional inspection performed on 10% of components • Cleaning performed on 100% of components, also note Cleaning Specification revision number and date • Single-bag packaging performed on 100% of components • Note the Air Products purchase order number, supplier lot number, mill heats utilized to fill order, shipping order number, date, and signature of supplier’s Quality Control Representative When specified in the PO, certificate shall include verification of the following: • Surface finish testing performed • Particle count testing performed • Gaseous impurity testing performed
Marking	All tube lengths and tube fittings shall be marked as follows: • Manufacturer’s name or unique symbol • “Seamless” or “welded” • Serial number or lot number • Heat number within 24 inches of each end • Part number (tube fittings only)
Protection	None
Color Coding	Not required
Packing	Packaging: Packaging shall be performed in a Class 100 cleanroom or clean zone. Each component shall be purged prior to capping using 99.999% pure, 0.01 micron filtered nitrogen. Both component end connections shall be sealed by pressing polyethylene caps over 45 micron (1.75 x 10 -3 inch) thick polyamide squares. Then each component shall be bagged in 150 micron (6 x 10 -3 inch) thick polyethylene sleeves or bags. Bag shall be vacuum sealed or purged. When purge sealing, purge gas shall be entrapped inside bag prior to sealing. Shipment Packing: Components shall be packed for shipment so that damage will not occur to the bagging or components. All shipments of 25 kilograms (50 pounds) or greater shall be packaged inside wooden crates or plastic cases. Components shall be packed in the crate/case using shock-absorbing spacers and keepers. Voids shall be filled with shock-absorbing materials. Additionally, wooden crates shall be inner lined with polyethylene sheet and outer wrapped with stretch plastic. The supplier shall guarantee quality and cleanliness upon delivery to Air Products. Any component that is received by Air Products in a damaged condition shall be returned and replaced, all at the supplier’s expense. Damage also includes a torn bag and loss of purge gas environment.
Special Requirements	Cleaning: Cleaning shall be performed in a Class 100 cleanroom or clean zone. Cleaning of tube and fittings shall be performed per supplier’s cleaning specification. A final rinse shall be made with deionized water and the effluent shall be monitored for resistivity. The acceptable resistivity level is ≥ 17.5 megaohm-cm. The following is a recommended cleaning method: Step 1: Wash by submerging in multi-stage continuous counterflowing deionized water baths. Final rinse with a 60°C (140°F) deionized water spray. Step 2: Dry by purging with 99.999% pure, 0.01 micron filtered, 60°C (140°F) nitrogen. For fittings, bake off residual moisture by using a vacuum oven or a heat lamp.

Leave a Reply Cancel reply