> United Kingdom Society for Trenchless ?· in this bulletin, please call the ... Andy Russell, WRc…

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  • WHATS HAPPENING?

    Membership renewals fell due on 01 January 2008and all members should have received theirrenewal invoices.

    If you have not received or maybe mislaid your invoice,please call Val on 01926 330935 for a duplicate, oremail admin@ukstt.org.uk United Kingdom Society for Trenchless Technology.

    > UKSTT Newsletter / February 2008 / Designed & Produced by Drain Trader Magazine / 01

    UKSTT Awards Dinner25th April 2008

    The closing date for award entries is Friday 29 February 2008.

    TADrillinglimited

    Astec Undergroundunleash the Astec Undergroundunleash the Call TA Drilling now on 01424 854112 or visit www.tadrilling.co.uk or email info@tadrilling.co.uk

    For more details visit our website at www.ukstt.org.uk

  • LINEWATCHPromoting Safety & Awareness

    Word spread and shortly Esso and Mainline were joinedby BPA and GPSS (Government Pipeline and StorageSystem). Since those early years the group has grownand now also represents Total, ConocoPhill ips,Manchester Jetline, Sabic, Shell, BP, E-On, Ineos and,most recently, Centrica. Promotion is via the usualavenues (presentations, literature, trade shows and theLinewatch website www.linewatch.co.uk) but, importantly,all the associated costs are met by the pipeline operatorsand not the third party recipients.

    Over the past years, Linewatch has actively backed callsfor a one-call system in this country. As a spin-off ofLinewatchs desire to see such a system, Fisher Germaninitiated a free-to-user, web-based enquiry system callLinesearch www.linesearch.org

    In a short space of time this website has become wellused current usage being in the region of 42,500enquiries a month. As the third party can input theinformation themselves and the response is immediate,this can cut down the time that a search takes. In the tighttimescales that many utility works are required to meet,this is very important. If the enquiry shows not affectedno further action is required on the part of the third party.If the response shows within the zone the third party is

    prompted to contact the relevant pipeline operator whosecontact details are shown.

    Historically, Linewatchs approach has been reactive,normally contacting companies as a result of an incidentor near-miss situation. The group recognised that itwould be better to approach companies before they gotinto a potentially hazardous situation. Whereas thereactive approach will still play a part, the aim is todevote more time to working with organisations to assistin developing robust, safe systems for planning worksnear to these pipelines. By ensuring that the potentialhazards are recognised at the planning stage of works,these can be largely engineered out. The pipelineoperators all offer free support and request that theyhave a representative on site during any works in closeproximity to their pipelines. Our aim is to prevent anyincidents involving our pipelines and to ensure the safetyof people and the environment.

    Pipelines in the UK have a very good safety record(pipelines are the safest and most efficient means oftransporting the fuels used in this country), and we striveto maintain this record at the highest standard. As theLinewatch strapline states, Watch out, theres a pipelineabout! United Kingdom Society for Trenchless Technology.

    > UKSTT Newsletter / February 2008 / Designed & Produced by Drain Trader Magazine02 /

  • > United Kingdom Society for Trenchless Technology.

    > UKSTT Newsletter / February 2008 / Designed & Produced by Drain Trader Magazine / 03

    NO-DIG ROOT CLEARANCE TECHNIQUESFor Drains and Sewers

    CORPORATE MEMBERS ANNOUNCEMENTGRUNDOPIT Accuracy Beyond DoubtProject Overview

    The investigation identified a number of lessons tobe learnt from the event, and these have beencommunicated to staff and operatives. In addition, anumber of the learning points are thought to berelevant to contractors undertaking root removalactivities of this nature, and these are:

    1. Be aware that gas pipes and other moled utility servicesmay encroach on drains. Consider the possibility thatutilities plant may be causing the blockage.

    2. Use water jets to clean the drain and the blockage priorto doing the camera survey, to improve the chances ofvisually identifying any pipes/cables that may be present.

    3. At all stages of the clearance work, be alert to anyindications that plant may have been damaged e.g. lossof gas, electric or water supply to any nearby properties, asmell of gas, evidence of clear water in the system, sounds

    of electric arcing, evidence of pipe or cable fragmentswhen the clearance work is complete, etc.

    4. Be aware of the tool operating in an unexpected manner i.e. not consistent with root cutting. If you suspect thatthere is a gas/water pipe or electric cable in the drain do notuse the cutter. Excavate to expose the plant and call forassistance from the relevant utility. If the exposed pipe isyellow contact the gas emergency service (see numberbelow). If the pipe is blue or constructed of copper contactyour local water authority; and if it is a black or red cablethen contact the local electricity network operator.

    If you have any queries regarding the information containedin this bulletin, please call the relevant gas plant enquiryteam. Consult local directories for other utility contactdetails. If you smell gas at any time, contact the NationalGas Emergency Service immediately on 0800 111 999. United Kingdom Society for Trenchless Technology.

    > UKSTT Newsletter / February 2008 / Designed & Produced by Drain Trader Magazine04 /

    Newsletter Sponsorship

    Sponsorship of articles including your company detailsand logo can also be included at the following rates:Banner (max. 3cm high at the bottom of any page) 1001/4 page (Not on front page) 250

    For more information, please contact Andy Russell at:andy.russell@wrcplc.co.uk

    application more fully and to gain data on accuracy. This started on22 August 2007 with the intention of completing bores ranging from10 to 17 metres long.

    Day one involved induction,manufacturing and installingtemporary benching to allowthe Grundopit to sit both stablyand at the correct invert depthinside the 1050 mm diametermanhole chamber. A concretecore was drilled through thechamber wall to enable the pilotbore and pullback of the lateralconnection to be completed.

    The next stage was to lower the Grundopit base frame into position,on which the drill rig was then located. All appropriate hydraulic andwater pipes were then connected. A polymer was selected for thedrilling fluid on this occasion, to enable the ground to be stabilisedwithin the bore and to assist with removal of cuttings from the boringprocess.

    Drilling started with the pilot bore head being set to the requiredgradient. The 500 mm long drill rods were added progressively, andthe gradient was checked at one metre intervals to align with thepreviously surveyed terrain. The pilot bore took 45 minutes to drill, andwas checked for accuracy prior to widening the bore with a 130 mmdiameter backreamer. Accuracy of the pilot bore was within 10 mm ofdesign, although 50mm would have been acceptable. Backreamingstarted and the hole was widened and the lateral pipe pulled back tothe chamber in less than 30 minutes. The Grundopit was thendismantled and prepared for the next days drilling.

    During days two and three, based on the experience gained during theprevious day the setup time was significantly reduced to just over 35minutes, allowing two bores to be completed on day three. Withcareful future planning this could be increased to three, subject to twoproperty connections being drilled from the same launch chamber.The accuracy of the bores was similar to day one, being between 3and 10 mm and well within design tolerances.

    It was decided that day four would be the last day of the trial, due inpart to it being a Bank Holiday weekend. The trial had produceddecisive data with no aborted bores or failures. One bore was installedon the morning of day four, making a grand total of five installationsin the four days. Taking into account that two of these were halfdays, this made a total of three working days to install five roadcrossings between 10 and 13 metres long.

    Conclusions

    The expectations of accuracy, cost saving, minimized disruption andcustomer satisfaction of these trials were well proven based on fiveinstalled bores completed within three working days. Using traditionalopen cut methods this period could have been approximately 20days. On this basis alone, the cost savings would be seriouslyadvantageous estimated to be approximately 1/6th of the open-cutcosts. The boring process itself, using the Grundopit Manhole, is awholly trenchless system that will allow manhole to manholeinstallations if used in conjunction with short section pipes.

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