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Copyright 2007 M.R. Martin Construction Inc.
10.1 General
10.1.1 This specification shall cover all work necessary to install pipe by boring. This includes instances, where required, to avoid excavation in paved surfaces, sensitive restoration areas, where traffic congestion is prevalent or when specifically requested by authority having jurisdiction.
10.1.2 This specification shall cover installations of polyethylene and steel pipe up to NSP 24.
10.1.3 Where Horizontal Directional Drilling equipment is used, an instructor qualified by the manufacturer shall have trained the equipment operator. The Contractor shall provide adequate proof of operator training when requested by the owner. Where such work is sub-contracted, the same requirements will follow.
10.1.4 The contractor shall provide all labor, equipment, lubricants and instrumentation necessary to complete the work where HDD is being utilized.
10.1.5 The contractor shall obtain in advance stakeouts for all other buried utilities. For bores less than 30m in length, minimum horizontal and vertical clearances shall be maintained. Clearance shall be measured from the nearest edge of the largest cutter or back reamer, to the nearest edge of the utility. Utility exposure holes are mandatory when crossing all buried utilities i.e. opening of utility covers. For bores not within a 1m radius of any utilities, exposure holes are deemed as optional.
10.1.6 The contractor shall obtain in advance stakeouts for all other buried utilities
For bores greater than 30m in lengths, minimum clearances from other utilities shall be increased. A minimum of 450mm horizontal and 150mm vertical clearance shall be maintained. Clearance shall be measured from the nearest edge of the largest cutter or back reamer, to the nearest edge of the utility. Utility exposure holes are mandatory when crossing all buried utilities i.e. opening of utility covers. For bores not within a 1m radius of any utilities, exposure holes are deemed as optional.
10.1.7 HDD crossings of water or wetlands shall be carried out in accordance with the
applicable requirements, of the authority, granting permission for the bore.
10.1.8 HDD crossings of highways and railways shall be carried out in accordance with the applicable requirements of the authority granting permission for the bore.
10.1.9 The contractor shall verify soil type by any means up to and including digging test holes and provide such information to the owner, upon request, prior to boring.
10.1.10 Where the owner assesses that the soil type will be unsuitable for pipeline integrity, the contractor shall utilize other methods to install the product.
10.1.11 Boring shall follow a straight line. Alignment and cover shall not deviate more than 300mm from the required bore path. Where HDD equipment is being used, the maximum alignment and cover deviation shall be in accordance with clause 10.2.1.
10.1.12 The contractor shall provide special care to ensure no damage occurs to the pipe where it is pulled into bore holes. Where applicable and soil conditions could warrant, sand bags, pipe rollers or other approved supports shall be used and spaced at sufficient distance to prevent pipe from coming in contact with the ground.
10.1.13 Pipelines pulled through boreholes shall be fitted with a cap to prevent foreign matter from entering the pipe. Pipe shall be pulled by means of a Kellems grip, clevis fitting or an approved equivalent. The leading end of the pipe being pulled shall be fitted with an appropriately sized pulling swivel to prevent rotational torque from being transferred to the pipe.
10.2 Equipment
10.2.1 The contractor shall utilize equipment with steering capabilities complete with
profile and location tracking. Equipment requiring calibration shall be done at the beginning of each workday to ensure the continued accurate alignment and cover. The maximum horizontal and vertical deviation permitted from a defined path shall be 150mm.
10.2.2 Where HDD equipment requires the use of grounding mats or any other special
equipment, they shall be used.
10.2.3 The contractor shall expose the bore head as close as practicable to the first 50mm
into the bore to confirm alignment and cover. Utility exposure holes can also be used for this purpose. Any misalignment greater than that permitted in clause 10.2.1, shall be corrected.
10.2.4 For pipelines 100mm and smaller, the final back reaming pass shall be sized a minimum 50mm greater and 50% larger in diameter than the pipe being installed. For pipelines 150mm and greater, the final back reaming pass shall be a minimum of 150mm larger than the pipeline.
10.3 Environmental
10.3.1 The contractor shall take any and all necessary precautions to minimize
environmental damage associated with the set-up and use of HDD equipment.
10.3.2 The contractor shall abide by all applicable environmental requirements of the
authority granting permission to bore.
10.3.3 Bentonite and Polymers shall be the only approved lubricants permitted for
HDD applications. Any additives used shall be chemically inert, biodegradable and non-toxic. No petroleum-based additives shall be permitted. No detergent additives shall be permitted where polyethylene pipe is installed.
10.3.4 Upon request, the contractor shall furnish to the owner, copies of available MSDS
(Material Safety Data Sheets), for drilling lubricants.
10.3.5 The contractor shall contain the drilling lubricants where there is a possibility of
ponding or runoff into watercourses, ditches, drains and/or sewers. Applicable methods of containments include sand bags and polyethylene sheets, containment rings or absorbents booms, Vacuum trucks or site regarding (berms).
10.3.6 Where leakage of drilling lubricants occurs along the bore path, the contractor
shall take any and all necessary steps to minimize the impacts. Applicable methods of containments include reducing the pressure of the slurry flow, reducing the speed of the drill rotation, reducing the speed of the drill rod advancement or moving the drilling location. The contractor shall be responsible for any settlement and heavy damage along the bore path.
10.3.7 The contractor shall be responsible for the disposal of the drilling lubricants. The disposal shall be in accordance with all applicable government agencies requirements. The owner reserves the right to randomly test the drilling lubricants for contamination.
10.3.8 Contaminated lubricants shall be disposed of at an approved hazardous waste site. Non-contaminated lubricants shall be disposed of at an approved landfill site or an alternate approved site as arranged by the contractor.
HDD Sample Specifications
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