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The purpose of the test is to verify the integrity of the inner liner.
Clean the gasket with water.
Place a translucent background of sufficient thickness at each end.
Evacuate the value of 0.85 bar for 10 minutes.
Monitor using a light source inside the hose and identify any changes in behaviour and defects.
Record and compare the state of the inner liner with observations made during visual inspection.
On-site Hydrostatic Test
Check the tightness of the hose at a pressure generally higher than in operation.
Verify the behaviour of the hose structure: elongation ; deformation dilation.
Note: The hose is in position right on planks, metal pipes ....., so as to elevate the flanges of the floor and release the flexible constraints.
Fill with water and drain thoroughly hose lifting the drain side end (air pocket).
Mounting pressure to 0.7 bar and hold 5 min. Taking the length measure of the hose (L0).
Increase the pressure from 0.7 bar to half of the working rated pressure. Take 30 minutes and reduce pressure 0.7bars.
Increase the pressure from 0.7 bar to the working rated pressure. Hold 5 min and measure the length of the hose (L1).
Decrease the pressure to 0 bar and take 15 minutes.
Increase the pressure to 0.7 bar, and measure the length of the hose (L2).
L1 - L0 / L0 = temporary extension
L2 - L0 / L0 = permanent elongation
These values will be identified and compared with those measured in factories. For a temporary or permanent elongation greater than 2%, the hose should be removed from service.