Tests

To help conserve the precious energy, time and ensure the safety, our Pressure cookers undergo various Tests to make cooking a happy experience.

1. Air Pressure Test
2. Capacity Test
3. Proof Pressure test
4. Pressure Regulation Device test
5. Safety Pressure Relief Device Test
6. Bursting Test
7. Lid Removal Test
8. Workmanship and Finish

1. Air Pressure Test: This is also known as Leakage test by Air Pressure. The air pipe line is connected to vent pipe of cooker in closed position of cooker and dipped into water. First 0.4kgf/cm2 pressure is applied to the cooker. Purpose of this pressure is to observe that there is no leakage from the Gasket, Vent Pipe, Back Handle, Main Handle and S.P.R.D. If there is no leakage found, the pressure is increased upto 1.00 kgf/cm2 and observed again. This test is applied both to innerlid and outerlid types.

2. Capacity Tests: By Capacity of the cooker we mean the volume of water the cooker can hold upto the vent pipe. The capacity is denoted in Litres. There is no negative tolerance under this and the positive tolerance is below 500ml. The requirement remains same for all capacity of cookers and is applicable to both innerlid and outerlid types.

3. Proof Pressure Test: This is also a form of leakage test but performed by hydraulic pressure. For this test a hydraulic pump is connected to closed cooker’s vent pipe and a hydraulic pressure up to 2.00kgf/cm2 is applied after this. After applying the pressure, observations are made to check that there is no leakage. The test and process is applied both to innerlid as well as outerlid types.

4. Pressure Regulation Device test: Under this test, a pressure gauge of suitable range is fitted in place of safety valve. Cooker is filled with half of its capacity and placed on a burning stove. 1st lifting should be between 1.00 kgf/cm2 to 1.10 kgf/cm2 pressure. The 2nd and 3rd lifting shall not exceed 120% of the 1st lifting. By this we observe any excess inner pressure. The same process is applicable to both innerlid and outerlid types.

5. Safety Pressure Relief Device (S.P.R.D.) Test: Under this test, a pressure gauge of suitable range is fitted in place of pressure regulating device. Cooker is filled with 1/16th of the capacity of the cooker and placed on the burning stove. It should be fused between 1.5 kgf/cm2 to 3.00 kgf/cm2 pressure. This specification is only applicable for non repeating type safety valves. For repeating type safety valves, it shall be operated between 1.5 kgf/cm2 to 2.00 kgf/cm2 pressure. The same is applicable to both innerlid and outerlid types.

6. Bursting Test: A hydraulic Pump is connected to closed cooker’s vent pipe. A 6.00 kgf/cm2 pressure is applied through a hydraulic pump. Now it is checked that there shall not be any rupture or any deformation to ensure that the cooker will not burst and the appreciable leakage shall happen at the joint of the lid. The same process is applicable to both innerlid and outerlid types.

7. Lid Removal Test: This type of test is applicable only to outerlid type cookers. Under this test, a force of 12 kgf/cm2 is applied in any direction to any part of the lid and the lid must not be able to release unless the pressure inside has fallen below 0.18 kgf/cm2 pressure.

8. Workmanship and Finish: The body of the lid are ensured to be free from all wrinkles,scratches and other surface defects. The body and the lid are ensured to be neat and clean. The steel and brass parts except the screws,studs nuts and those of stainless steels should be plated chromium over nickel and the plating shall confirm to service grade number 2 of IS 1068