It is always advisable to out the PE pipeline testing before the covering. Generally the testing are carried out sectioning parts of proper length, Which must be closed with suitable systems.

For example, with blank flanges provided with connections for pressure gauge,pump,breathers,etc.

The pipeline must be anchored avoiding the movement of under pressure pipelines, and proceeding with partial trench covering leaving the jointings uncovered for further inspection. The pipeline is filled with water from the most low-laying point where the manometer must be
installed. Particular car is applied for the out coming of air from breathers,cocks,etc.

The pipeline is placed under pressure at a value up to 1,5 times the nominal pressure at 20C for 1 hour.

If there is a pressure loss, it is important to measure the necessary quantity of water to restore the testing pressure.

This quantity must not exceed the water quantity, derived from the formula:

QH20 = 0, 125 x L / 1000 x P / 3 x D / 25 x N

Where:

L =length in meters
P =testing pressure in bar
D =inside diameters in millimeters
N =number of hours

If the testing at 1 hour is positive, that of 12 hours will follow for the same pressure value, with check carried out with above calculation.