METHOD FOR TESTING PRODUCTS OPERATING UNDER EXCESSIVE PRESSURE Russian patent published in 2024 - IPC F15B19/00 F16J3/04 

FIELD: testing equipment.

SUBSTANCE: invention relates in particular to pneumatic methods for testing the strength of products operating under internal excess pressure from 0.001 to 100 MPa, the operating mode of which implies the possibility of an instantaneous (up to 5 seconds) drop in pressure of the internal environment from working to vacuum, for example, bellows expansion joints. The declared technical result is achieved by implementing a method for testing products operating under excess internal pressure, which consists in installing end caps on the test product, placing the product in a chamber, heating the internal cavity of the product to a temperature of 210±20°C and at the same time creating a pressure difference between the internal cavity of the test product and the chamber cavity of up to 0.5 MPa by creating an excess pressure inside the test product of up to 0.6 MPa, and in the chamber cavity of up to 0.1 MPa, maintaining a pressure drop for up to for at least two minutes. The valve opens and within 5 seconds, no more, the pressure is released from the internal cavity of the test product to an excess pressure value of 0 MPa, while maintaining the pressure in the chamber cavity equal to 0.1 MPa. The test product is held for 2-10 minutes, while ensuring a pressure difference between the internal cavity of the test product and the cavity of the chamber corresponding to a vacuum of -0.1 MPa.

EFFECT: expanding the arsenal of technical means for testing, reducing the labour costs by simplifying the test method, reducing the material consumption of the stand, providing the simulation of real operating conditions and universality of testing for all types of products operating under excess internal pressure, including any diameters.

2 cl, 1 dwg