S9074-AR-GIB-010/278
11.5.2 pressure containing applications. In addition to the testing required by 11.5.1, studs used in connection with openings in watertight, oil tight. gas or air tight, or pressure containing applications shall also be tested as follows: Ten percent of the studs. but not less than two per opening, shall be toque tested in accordance with 11.5.1.2. The sqle tested shall include the first and last studs welded for each opening. If any of the st& tested shaw signs of failure, all of the studs for the opening shall be tested. Studs showing signs of fail un shall be removed and new studs welded and tested. (a)
11.5.3 Nonpressure containing applications. For permanent nonpressure containing applications, the inspection requirements of 11.5.1 apply
11.5.4 Temporary attachments No testing is required for temporary attachment studs.
11.5.5 Repair to studs. Undercutting or lack of fusion-up to 1/4 of the stud diameter may be ground and repair welded using shielded metal -arc or gas tungsten-arc welding processes. Undercutting or lack of fusion greater than 1/4 of the stud diameter indicates poor stud welding technique for which the cause shall be determined and corrected. Studs whose defects exceed 114 of the stud diameter shall be removed and the plate surface ground smooth. Each stud that has been repair welded shall be inspected in accordance with 11.5.1.2. 11.6 Hard surfacing valve parts. Hard surfacing alloys are overlayed on valve part areas subjected to abrasion. corrosion, impact, and seizure in service. Hard surfacing alloys may be applied by shielded metal arc, oxyacetylene. gas tungsten-arc, and plasma-arc welding processes. Use of the oxyacetylene process for S-8 materials shall be limited to low carbon or stabilized grades only. Applicable welding procedures shall list only these grades. 11.6.1 Preheating and heat treatment of carbon and allow steal. Preheating shall be at least to the! minimum preheat temperature specified in table IV. Upon completion of welding, the part shall be covered and allowed to cool slowly. Weldments may be post weld heat treated immediately upon completion of welding. without prior cooling. Postheat stress relieving of austenitic stainless steels shall be restricted to the stabilized and low carbon grades and shall require specific approval as specified in table VI. Stress relief for S-1. 5-3 and S-4 materials is not required but may be performed for dimensional stability. For other alloy steels, stress relief shall be performed if required by table VI. 11.6.2 Inspection. Hard surfacing welds shall be visually examined and PT inspected in accordance with MIL-STD-27l. 11.6.3 Acceptance. Hard surfacing welds shall be in accordance with visual acceptance requirements and criteria for PT tests specified in MIL-STD-2035.
11.7 Pipe and tube bending. Pipe and tube bending shall be in accordance with MIL-STD-1627.
Original 104
Made with FlippingBook - Share PDF online