Mechanical Engineering Projects

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Rotorua District Council contracted us to supply and install mechanical and electrical aspects required to commission a UV disinfection plant on 9 of its water sources (UV units were supplied by RDC). Pipe works for this project ranged from 80mm Stainless Steel through to 600mm concrete lined steel and stainless steel pipe, as well as small bore instrumentation plumbing. Electrical works were from the ground up - constructing switchboards and developing site specific software for control of plant as well as monitoring and recording to achieve compliance with the drinking water standards. All the above had to be incorporated into RDC’s existing systems.

This was a technically challenging project due the location of some of the water supplies, the below ground works required to shut down, install bypass pipe work, and reinstatement of water supply within a condensed period.

9 sites were shut down and reinstated successfully within time frames specified.

Referees available upon request.

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Kapiti Coast District Council, in conjunction with Aurecon Consultants awarded the contract to upgrade 7 existing satellite waste water pump stations to Max Tarr Industrial Limited in 2012. The contract had a 7 week timeframe for completion.

Challenges for this project included lead times on some of the key components required to complete the works (valves and pre-cast concrete chambers) and dealing with incoming existing flows, as well as implementing traffic management plans. We were able to structure the project in a way that minimized any disruption to the program due the lead times.

The project was delivered on time and on budget, exceeding the client’s expectations.

Referees available upon request.

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In 2010 Max Tarr Industrial Limited successfully tendered the construction of a trial geothermal treatment plant designed by Environment Bay of Plenty in conjunction with Rotorua District Council, aimed at removing nitrates from a nearby stream. The plant was constructed on a section of land on SH 30 near Hells Gate. The concept was to partially treat water from the stream that contributed high level of nitrates to the lake. The site had an existing building, which we used to house the lime dosing plant (Designed and built by Max Tarr Industrial Limited to maximise available space).

The plant took a small percentage of water from the stream and brought it through a pH correction loop where lime was dosed and mixed, then circulated through a trickling filter where it was recirculated at a 5:1 ratio, before heading through the denitrification bed and returning to the stream. The aim was to project the scale of a full size project to be developed further on.

Referees available upon request.

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Porirua City Council engaged Beca and Max Tarr Industrial Limited to undertake a major upgrade of the Tangere drive waste water pump station. This is the last major pump station before the treatment plant, capable of shifting up to 1200 litres per second via 4 x 300kW dry mounted pump sets.

Mechanically the project was complex. Four new suction pipes had to be installed through a section of the wet well wall over 500mm thick, as well as anti-vortex plates installed in the wet well. Four new 300kW flygt pumps were lowered into the dry well, and coupled to the suction pipe work. Given the constraints of the existing manifold, the discharge pipe work was fabricated to fit on site then removed for coatings to be applied.

Electrically a new 1600 Amp switchboard was build, including 4 new VSD Drives to control the pumps as well as integrating the telemetry and SCADA systems to suit existing PCC system requirements. All software and HMI graphics were developed in house.

Four pumps were replaced, and new switchboard and electrical components were installed without incident.

Referees available upon request.

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In 2010 Max Tarr Industrial Limited was awarded the mechanical and electrical contract for the Masterton Waste Water Treatment plant upgrade. The project is largely green field construction as existing infrastructure was not in place to handle the anticipated increase in loading. The major items of the plant included the inlet gravel trap and screening plant, including automated step screen, an inlet pump station, with 4 x 37kW Flygt submersible pumps discharging through a 600mm concrete lined steel pipe manifold, an irrigation pump station with 2 x 37kW Flygt submersible pumps, discharging through a network of bubble up valves imported from Australia, and a discharge structure, where after final treatment, effluent is able to be discharged into the river. The project made extensive use of penstock and stop board water control gates, both manual and automated, to manage water flow route.

Max Tarr Industrial built up all the switchboards for the project and in conjunction with Abbey Systems, managed 172 bubble-up valves via telemetry to allow controlled land based discharge of treated effluent.

This project is on-going, with completion expected in 2013.

Referees available upon request.

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Marlborough District Council, with assistance from Beca, contracted Max Tarr Industrial Limited to supply and install mechanical and electrical aspects required to commission the UV disinfection plant for its Picton water sources (UV units were supplied by MDC). Pipe work for this project was mainly undertaken in PE with connections fore and aft of the UV unit in stainless steel, as well as small bore instrumentation plumbing. Electrical work was constructed from the ground up, building switchboards, and developing site specific software for control of the plant in addition to monitoring and recording to ensure compliance with the drinking water standards. All of the above had to be incorporated into RDC’s existing systems.

This was a technically challenging project due the location of some of the works, Essons Valley draws it water from a dam constructed approximately 3 km upstream from the treatment plant. It is piped to the plant where it undergoes filtration and dosing, before being pumped to reservoirs and town supply.

A solar panel, battery storage and turbidity monitoring station was installed on the dam face, with monitoring via telemetry, as well as a compressed air generator as back up for the solar system.

Project was completed on time and on budget.

Referees available upon request.

 
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