a) Raw Materials Inspection
• Radiography of the casting is carried out at the foundry level as per ASTM E446 / E186 and
..acceptance criteria as per ASME B 16.34 / ASME Section VIII.
• Visual method for evaluation of Surface Irregularities to MSS SP - 55
• LP Examination as per ASME Section VIII Div1, ASTM E165, ASME Section V & ASME B 16.34
• Magnetic Particle Examination Method to ASTM E 609. |
b) In- Process Inspection
c) Dye-Penetrant Test
d) Hydraulic and Air Test
e) Helium Leak Test
f) Bellow Cyclic Test
g) Corrective & Preventive Action
h) Calibration of Equipments and Gauges
i) Customer Feed Back
Critical Test for Bellows
Fatigue / Cycle Test
Cyclic Test for the bellow is carried out for testing the fatigue strength of the bellows. Minimum 10,000 cycles (i.e. to and fro Axial movement of the bellow) are carried out for each type of the bellow on a special spring rate testing fixture and bellow cyclic testing machine available in house.
Helium Leak Test (On MSLD)
Bellow Seal Valves for Vaccum Services, Helium Leak test is essential. This test is carried in-house at our works whereby valves will be tested at 10-6 Torr with Helium Gas. This would only help to certify whether the valve is suitable for Vaccum and other critical application or not.
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