- Chemical Resistance
- Safety Data Sheets (SDS)
- Material Properties
- PRO Systems
- PE Pressure Pipe
- PE Pipe Selection
- MAOP for PE Pipes
- Temperature Influences
- Selection of Wall Thickness for Special Applications
- Hydraulic Design for PE Pipes
- Surge and Fatigue
- Slurry Flow
- Pneumatic Flow
- Expansion and Contraction
- External Pressure Resistance
- Allowable Bending Radius
- Thrust Block Support
- Conductivity, Vibration and Heat Sources
- Polyethylene Jointing
- Handling and Storage
- Trench Preparation for Buried Pipes
- Relining and Sliplining
- Pipeline Detection
- Above Ground Installation
- Accommodation of Thermal Movement by Deflection Legs
- Service Connections for PE Pipes
- Concrete Encasement
- Fire Rating
- Testing and Commissioning
- PVC Pressure Pipe
- PVC Pressure Pipe Standards
- Pressure Considerations
- PVC Temperature Considerations
- Mine Subsidence
- Water Hammer
- Thrust Support
- Air and Scour Valves
- Soil and Traffic Loads
- Bending Loads
- PVC Pipe Jointing
- Jointing Components with Ductile Iron Flanged Joints
- Service Connections for PVC Pipe
- PVC Pipe Handling and Storage
- Below Ground Installation
- Above Ground Installation for PVC Pipe
- Testing and Commissioning for PVC Pressure Pipe
- Detecting Buried Pipes
- FLUFF – Friction Loss in Uniform Fluid Flow
- Technical Notes
Leakage testing is carried out to identify installation faults and sources of infiltration and exfiltration in pipelines which are required to be water tight such as sewerage systems. Leakage testing is generally not required for stormwater drains.
It is advisable to begin testing early in the pipeline installation to confirm adequacy of laying procedures and, where appropriate, to increase the length tested progressively as experience is gained.
AS/NZS 2566.2 specifies detailed procedures for leakage testing using hydrostatic testing, air or vacuum testing or infiltration testing of non pressure pipelines. These methods are summarised below. Notwithstanding this, leakage testing should be carried out in accordance with local authority requirements.
Fill the pipeline with water and pressurise to not less than 20kPa at the highest point of the section being tested, but not greater than 60kPa at the lowest point of the test section. Maintain the test pressure for at least 2 hours by adding measured volumes of water if required. Each joint should be carefully examined visually for leaks, and any defects should be repaired. The pipeline section is deemed satisfactory if the make-up volume is less that 0.5L per hour per metre length per metre diameter. After any repairs, the pipeline should be re-tested.
Introduce air slowly by suitable means until a pressure of 25kPa is obtained. Maintain for a period of at least 3 minutes. If no leaks are observed after 3 minutes, shut off the air supply. If the pressure of air contained in the pipes under test does not fall below 18kPa within the time period specified in the Table below, the pipeline shall be considered satisfactory.
If, however, the pressure is not maintained within the specified limits, reintroduce the air and examine the pipeline for leaks by pouring a concentrated solution of soft soap and water over the joints and fittings. Identify and repair any leaks. After any repairs, the pipeline should be re-tested.
Apply a vacuum until a negative pressure of 25 kPa is obtained. Maintain for a period of at least 3 minutes. If no leaks are observed after 3 minutes, isolate the test section from the vacuum pump. Monitor the pressure for the time specified in the Table below. If the vacuum does not drop below 18 kPa within the specified time period, the pipeline shall be considered satisfactory. Where the pipeline section fails the test, re-apply the vacuum and examine the pipeline for leaks. Identify and repair any leaks. After any repairs, the pipeline should be re-tested.
|DN||Test Length (m) -50||Test Length (m) -100||Test Length (m) -150||Test Length (m) -200||Test Length (m) -250|
|Minimum Test Duration (min)||Minimum Test Duration (min)||Minimum Test Duration (min)||Minimum Test Duration (min)||Minimum Test Duration (min)|
Where there is a free standing water table at a height of at least 1.5m above the test section, an infiltration test can be carried out. Observe the pipe for 24 hours. Where infiltration is detected, the leak should be identified and repaired.