PIPELINE INSPECTION 

The BIT method is:

• Assess the condition of every single pipe, instead of a limited number of samples
• Prioritise pipes and actions by risk and cost, instead of using weak indicators such as age
• Strategic planning for the future, instead of “Run to failure”, then rebuild

We routinely scan between 200 and 800 meters (depending upon the pipe) in each direction from a single entry point and scan the full 360 degree circumference of the pipe. We scan pipes in the range 300mm to 1200mm. The resolution generated by BIT’s proprietary PipeScanner (PS) enables us to identify corrosion pits down to a resolution of 1 x 1.5cms (based on 300mm pipes), as well as small and large areas of corrosion, and to differentiate between internal and external corrosion.

A BIT Inspection Unit consists of a specially equipped inspection vehicle, a two-man operational team and a PipeScanner. The PS is lowered into the water-filled pipe and floated through the inspection length of the pipe. The PS is weight-neutral in water, minimizing contact and pressure on pipe walls. The actual scanning takes place as the PS is pulled back to the insertion point, while transferring data to computers in the inspection vehicle. Most scans take no longer than 2 hours.

Scan results are analysed by BIT’s advanced computer analysis system (PARS) before our engineers produce a report for presentation to the client. With this data, we provide recommendations on the most suitable and cost-effective rehabilitation schemes. Clients receive a thorough and clear report that is easy to understand, with fact-based recommendations that enable a cost-saving and a sustainable infrastructure asset management strategy. Data from our inspections can also be integrated in geographical information systems (GIS) or other asset management systems. As a result, the life-cycle cost of water distribution networks is reduced, as is the risk involved in not knowing the actual condition of crucial water infrastructure.

• Stage 1

  Planning & preparations
  • Verify suitability of site: visit site, study maps, ship BEP (Breivoll Entry Pipe)/hatch
• Stage 2

  Site preparation
  • Excavate pipe, install BEP/Hatch
  • Same day or day before
• Stage 3

  Inspection
• Stage 4

  Post-inspection work
  • Repair pipe, close ditch
  • Same day or next
• Stage 5

  Analysis
  • Starts next day (+1), 2-10 work days. Depending on complexity
• Stage 6

  Report delivery
  • Around 10 days after inspection

Operational Requirements

BIT services require:

• Total service interruption typically 8-12 hours including pipe access
• Access to pipeline for 5-8 hours during inspection
• On-site staff to control water pressure and flow during inspection
• No more than 11 degree bends on DN300, or 22 degree bends on DN400, 45 degree bends on DN600
• No butterfly valves

Inspection unit