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Home : Products : HDPE Quality Assurance Plan
 System Control :

Click here for Standard Quality Assurance Plan

quality control system
 
 HDPE Pressure Pipeline Testing :
Polyethylene is a resilient material, lightweight and easy to handle. Nonetheless, care should be taken not to cause scuffing or gouging of the surface. In addition to the guidelines set out here, the handling and storage of PE pipe is covered by codes of practice issued by various utilities (eg. the WRc manual for PE pipe systems for water supply)
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.