Where inspections are carried out from both ends of a pipeline section, the Contractor shall
endeavour to terminate each part of the inspection at a common, readily identifiable, feature or defect.
Should the Contractor consistently inspect from both ends of pipeline sections due to equipment or methodology inadequacies, the Engineer may require the Contractor to make appropriate changes to enable single pass inspections.
8 HIGH WATER FLOWS AND DIPS 8.1 Depth of Water Flow During Inspection
The maximum depth of water flow permitted during the inspection is specified in the Particular Specification.
If the maximum depth of water flow exceeds specified depths then the flow shall be lowered by plugging the line and/or bypass pumping or by rescheduling the CCTV inspection to time when there is less flow.
8.2 Inspection Through Dips
CCTV inspections shall generally continue throughout the full length of any dip that is encountered, and the extent of the dip noted on the log sheets in the normal manner. Alternatively if the Contractor has genuine concerns about the safety of the equipment in a dip, the length of the dip may be
determined by inspecting from the other direction.
Where a dip continues through a manhole, it shall be recorded in accordance with the instructions for recording a “DP” defect code (refer Section 5 of the Manual).
If the depth of water in the dip exceeds the maximum depth specified in the Particular Specification, then the water shall be removed and the section of pipeline.
Where water is removed from a dip with a flusher unit, it shall be in a downstream direction, i.e. with the flusher unit set up at the downstream manhole.
Where a rise in water level in a pipeline is subsequently found to be caused by debris which should have been removed by the cleaning specified in the Particular Specification, no additional payments will be made for re-cleaning and re-inspection.
8.3 Flat Gradients
If the depth of water in a pipeline due to flat gradients exceeds the maximum depth specified in the Particular Specification, the Contractor shall proceed as for a dip. The depth of water in the pipeline at each end of that section prior to modifying flow levels shall recorded.
9 BLOCK AGES PREVENTING PASSAGE OF EQUIPMENT
Blockages, which prevent the passage of equipment, shall be photographed. The inspection shall then continue from the opposite direction, up to the same blockage if feasible.
Standard Documents
10 RISK TO EQUIPMENT
The Principal will accept no responsibility for damage to or loss of the Contractor's equipment, unless specific instructions have been given by the Engineer directing that the works proceed through an area of risk. Any works required to recover Contractor's equipment shall be the full responsibility of the Contractor, and shall be carried out only with the prior approval of the Engineer.
In the event that the Contractor considers that to proceed further with cleaning or an inspection could involve risk of damage to the equipment, or risk of equipment becoming jammed in the pipeline, then that inspection may be abandoned at that point. The Contractor shall then inspect from the other direction to the point of abandonment, where practicable.
In such cases the contractor is to inform the Engineer. The Engineer may instruct the contractor to proceed with the inspection through the area at risk. In which case payment for recovery of equipment will be made if the equipment becomes stuck.
11 ABANDONMENT
Where an inspection is abandoned for whatever reason, payment will only be made for the length of pipeline for which there is a video picture of acceptable quality. Examples of reasons for
abandonment are given in Section 2 of the Manual.
Where the full section of pipeline can be inspected by removing temporary obstructions, inspecting down to the point of abandonment from the other direction and the like, the inspection is not regarded as “abandoned”.
Abandoned inspections shall all be recorded and the reason/s for abandonment clearly identified in the “Remarks” column of the condition records, and the Inspection Status recorded as “UI”
(Uncompleted Inspection) in the header.
When a pipeline inspection is abandoned, details of the reason/s for abandonment shall be recorded and handed to the Engineer within 5 working days.
Where the cause of the abandonment is rectified prior to completion of the inspection works with intervention by the Engineer, the Contractor shall complete the inspection.
12 DELIVERABLES
The type and quantity of deliverables to be provided are specified in the Special Condition of Contract.
12.1 Electronic data
Electronic data shall be provided in accordance with the Particular Specification. Computer disks must be free of all forms of computer virus, and labelled in accordance with the requirements of the Particular Specification.
Standard Documents
12.2 Log sheets
Logsheet headers shall contain the following information, plus any other additional information specified in the Particular Technical Specification:
• Asset No.
• Contract No.
• Operator.
• Camera Operator.
• Date Started.
• Time Started.
• Upstream/Downstream Manhole/Node No.
• Video Record No.
• Video Recorder Run-time Start.
• Set Up.
• Parallel Line No.
• Currency of Inspection.
• Status of Pipe.
• Inspection Status.
• Line Length.
• Surveyed Length.
• Pipe Diameter.
• Joint Spacing.
• Material.
The Contractor shall ensure that logsheets include records of debris deposits, dips and/or roots where it is known these defects occurred, whether or not the defects are visible in the submitted video record. An estimate of the severity of any deposits, dips or root intrusions, shall be made when necessary.
12.3 Summary Sheets
Summary Sheets shall contain the following information:
• Date.
• Video counter reading in hhmmss format, e.g. 012350. (Only applicable to inspections recorded on video).
• Area (or town).
• Upstream manhole.
• Downstream manhole.
• Pipe Asset No.
The summary sheet header shall contain the following information:
• Contract Number.
• Name of the Contractor.
• Video record number.
12.4 Video Records
Where the supply of video tapes is specified in the Particular Specifications then they shall be provided in VHS format and labelled in the manner specified in Particular Specifications.
Standard Documents
12.5 DVD Records
Where the supply of DVDs is specified in the Particular Specifications then they shall be supplied in the following format:
• Encoded to WMV, MPEG1, or MPEG2 format (PAL standard, Capture Rate = 25 frames/sec and minimum Sample Rate = 1.2Mb/sec for WMV, minimum Sample Rate = 1.2 Mb/sec for MPEG1 or 3Mb/sec for MPEG2)
• Recorded on DVD dual layered discs.
• Readable on DVD-ROM drives using Windows Media Player software.
• Separate video file for each pipeline section inspection to the following naming convention:
AAAAA BBBBBBB CCCCCC DDDD
(underscore to separate each block of code).