U-bend Type Seamless tubes SB-444 / SB-444M UNS N06625 Grade 1 Technical Delivery Conditions (TDC)

E-2670-ME-00-TDC-0258 (SB-444 UNS N06625)

U-bend Type Seamless tubes SB-444 / SB-444M UNS N06625 Grade 1 Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger tubes

SB-23 / SB-23M ASME Section II Part B Ed. 65

- U-bend Type Seamless tubes SB-444 / SB-444M UNS N06625 Grade 1 Markings/Test report AS per SB-829/SB-829M

- U-bend Type Seamless tubes SB-444 / SB-444M UNS N06625 Grade 1 Tolerances As per SB-444/SB-444M

1. U-bend Type Seamless Tubes SB-444 / SB-444M UNS N06625 Grade 1 General requirement,

- Wall thickness shall be as specified in PR or PO (i.e. minimum ) after construction.

- All Tube material shall be free of rust, dirt, pits, gouges, and crevices.

- Product Analysis shall be reported in MTC.

- Each tube shall be formed from a single length without circumferential welds.

- All tubes shall be in the annealed condition.

2 U-bend Type Seamless Tubes SB-444 / SB-444M UNS N06625 Grade 1 Non-destructive Testing,

- All tubes shall be subjected to Eddy current testing as per ASTM E 571 & Annexure-I.

- Visual inspection of the U-bends after the bending in order to verify that there are no flaws such as folds, shrinks, friction signs or material tears, or flattening.

3 U-bend Type Seamless Tubes SB-444 / SB-444M UNS N06625 Grade 1 Marking and Certification,

- Material marking fluid shall be compatible with Inconel steel, e.g. they shall not contain chlorides, zinc, sulfur, or other detrimental components.

- Markings shall be protected from erosion, wear, or other events that may render them unreadable.

- Material test reports shall be submitted conforming to mandatory certification requirements as per material specification and this TDC.

- Material certificate shall contain all the data relating to the condition of supply, tests, and examinations.

4. U-bend Type Seamless tubes SB-444 / SB-444M UNS N06625 Grade 1 Additional Clients General Requirement,

- The country of origin for items (finished product) and the raw materials from which the items are formed shall be traceable from the certification and/or marking.

5. U-bend Type Seamless tubes SB-444 / SB-444M UNS N06625 Grade 1 Tolerances

- Tube wall thinning in the bends shall not exceed a nominal 3% of the original tube wall thickness.

- Flattening at the bends shall not exceed 10% nominal OD of straight portion tube for U-tubes.

- Mock-up result shall be checked at minimum bend radius ( 0,30,60,90 Deg) for thinning and flattening.

6. U-bend Type Seamless tubes SB-444 / SB-444M UNS N06625 Grade 1 Heat Treatment for U-bend portion,

- After bending all tubes shall be subjected to heat treatment at 871˚C min. followed by rapid cooling.

- Heat treatment shall be completed by electric resistance or furnace methods. Open Flame heat treatment is not permitted.

- For electric resistance or induction heating, the heat-treated portion of the U-bend shall extend at least 300 mm beyond the tangent point. For furnace heating, the heat treatment shall extend at least 600 mm beyond the tangent point.

- After heat treatment, all tubes shall receive a descaling treatment. All mill scales will be removed.

- During treatment mentioned in Clause 6.1, the Inside surface of the tube shall be protected by an inert gas atmosphere.

7. U-bend Type Seamless tubes SB-444 / SB-444M UNS N06625 Grade 1 Annexure-I NDE requirements for Tubes

- If pierced mother hollow is used then UT of mother hollow shall be carried out as per Article 4 of ASME Sec V, Edition 65. Acceptance criteria for UT shall be as per Appendix-12 of ASME SEC VIII Div.1,65 Edition.

- If extruded mother hollow is used then the requirement mentioned in Clause 2.1 is not applicable.

- Eddy current testing on all tubes shall be carried out as per Table 1 and the calibration sample for eddy current testing shall be as per Table 2. Eddy current testing shall be performed on all tubes before bending the tube. Table-1

- Both ends of the tube shall be cut, to remove the "Blind Area" after testing the tube. Refer to table 3. Table 3 Tube Length that has to be cut after ECT

- Hydro test carry out for all tubes, for a minimum holding time of 2 minutes. The maximum chloride content of water shall be 30 ppm.

- Digital pressure gauge shall be required for the hydro test.

- U- bends on both sides shall be subjected to dye penetrant examination (U portion + 300mm straight length). A crack or any relevant linear indication shall result in the rejection of the tube as per ASME Sec. VIII Div.1 App. 8.

- Any non-relevant linear indication on the U bend portion shall be polished for removal and eliminate the possibility of relevant indication.

- DP testing shall be carried out on both ends of the tube, from outside up to 2 inches and from Inside up to the available accessible area, after tubes are cut to length. Acceptance criteria as per ASME Sec. VIII Div.1 App. 8.

- ECT shall be witnessed by a person who has a valid ECT level 2 certificate & All ECT reports shall be certified by an ECT level 2 person only.

- For ID and OD Eddy current Testing, ECT charts/reports shall be submitted in soft copy along with the Material Test Certificate of the tube.

- The frequency of checking the calibration shall be at least every four hours, but also whenever there is an equipment team operator team changeover and at the start and end of testing.

Acceptance Criteria

OD ECT Calibration Sample (Encircling Coil Method)

Method

ASTM E-426 & Article 8 of ASME SEC V, Edition 65

ASTM E-426 Signal to noise ratio 2.5 to 1 or grater as per ASTM A102 clause 25.9.4, No defect, Wall thinning shall not be more that as allowed by material spec & TDC As per SB-829 ID ECT Calibration Sample (Bobbin Coil Method)

End Effect sample

100 mm untested portion cut off after ECT.

As per Clause No (a), (c), (d),(e) of VIII-862.2 of Mandatory Appendix of Article 8 of ASME SEC V, Edition 65

In addition to Point No.1, as per clause (f) of VIII-862.2, the following additional calibration discontinuities are mandatory in the calibration sample:1) 360-degree circumferential groove on OD for 6%, 40%and 60% of wall thickness2)5 dia FBH at 60% and 80% wall thickness on OD3)4 X FBH of 5 dia at 60% wall thickness on OD spaced at 90deg apart in a single plane around the tube circumference

1)Drilled hole according to ASME SA-102, section 25.8.2.1 (diameter of 0.031” (0.79mm)

2)As per 5.3.1.3 of SB-829