Month: April 2017

Christchurch Civic Centre – Water Feature

PROJECT SUMMARY:

As part of the refurbishment of the new Christchurch City Council Civic building a water feature was constructed at the northern entrance. H2O were involved during the concept development stage of the design of the water feature and later were contracted by the main contractor Hawkins Construction to provide the detailed design, installation and commissioning phase of the contract.

CLIENT: Hawkins Construction

PROJECT DETAILS:

The water feature presented a unique challenge in that the main structure of the facility was already existing. The plant room was situated in a remote part of the basement of the building close to other electrical systems with no gravity drainage available. A high level of water treatment was implemented to reduce chlorine fumes from effecting the basement as well as an automated water dumping system which discharges water from the system during heavy rain.

  • Circulation pump with stainless steel inlet strainer
  • Water jet pump and controls for 3 jet fountains.
  • Water filtration and UV Treatment with Triogen UV.
  • Automated water chlorination and pH control.
  • Automatic water dumping in case of feature flooding during heavy rain.

The Water feature was completed to the allocated budgets and in the required timeframes during the building construction period. We continue to service and maintain this feature today.

Kelly Tarltons – Life Support Systems Refurbishment, Auckland

 

PROJECT SUMMARY:

As part of continued improvements at Auckland’s Kelly Tarltons Underwater World, H2O Engineering was awarded the contract to replace the facility’s sea water filtration system along with upgrades to the Ozone gas distribution and water chilling systems.
The scope included detailed design, installation and commissioning of each of the replaced or refurbished systems.

CONSULTING ENGINEERS: Thorburn Consultants

CLIENT: Hawkins Construction

PROJECT DETAILS:
The Kelly Tarltons plant room environment presented a unique challenge due to the moist salt air environment and space restrictions for new plant. Along with environmental considerations inside the plant room all the works took place while the facility and life support systems were in operation. Careful consideration of materials was required with every aspect of the project to ensure upgraded systems were robust enough for long term service.

  • Demolition and removal of redundant steel sand filter, cut into approximately 20 pieces in situ and removed from site.
  • Installation of 2 x 1400mm diameter fibreglass sand filters with automatic valve harness.
  • Installation of new Aquarium water chilling heat exchanger for the main aquarium.
  • Installation of a new Ozone gas distribution system throughout the facility, including connection to the three main life support systems.
  • Upgrades to water chilling systems on two operational life support systems.

All the contracted works were completed on time and budget during refurbishment works for the main facility aquarium in 2010.

Wind Tree Sculpture & Water Feature – Wynyard Quarter

PROJECT SUMMARY: 

As part of the ongoing development of Auckland’s Wynyard Quarter a water feature was constructed as part of the “Wind Tree” Sculpture that was re-instated from storage. H2O were contracted to provide the detailed design, installation and commissioning of the Water Feature.

CLIENT: Dominion Constructors

PROJECT DETAILS:
The design of the Feature was straight forward with a simple pond like expectation from the Architects. The Water Feature system consists of the following:

  • 2 x Feature pumps with integral inlet strainers
  • Filtration system with Sand Filter and Filter Pump.
  • Automated water chlorination and pH control
  • Automatic mains water make up.
  • Floor sump with submersible pump for flood protection.

The Water Feature was completed to the allocated budget and within the required timeframe. We continue to service and maintain this feature today. As a result of this ongoing service work it was quickly discovered the original filtration system would be unable to cope with the unforeseen dirt loading of the feature due to windblown debris, bird feathers from Seagulls and dirt being carried in from nearby gardens. To overcome this problem a second filter was installed which has resulted in satisfactory operation of the feature.

 

Auckland Art Gallery Refurbishment – Water Features

PROJECT SUMMARY:
As part of the refurbishment of the Auckland Art Gallery three water features where constructed at various locations. H2O were contracted by Hawkins Construction to provide the detailed design, installation and commissioning of the features.

CLIENT: Hawkins Construction

PROJECT DETAILS:
The design and construction of the water features presented a challenge in that the main structure of the facility already existed or space for plantrooms was already allocated requiring lateral thinking around the use of plantroom space, location of reticulation pipework and the construction of surge tanks. Each of the Water Feature systems is independent and typically consists of the following:

Feature pump(s) with integral inlet strainer(s)
Filtration system with Sand Filter and Filter Pump.
Automated water chlorination and pH control
Automatic mains water top up.
Floor sump with submersible pump for flood protection.
The Water Features where completed to the allocated budgets and in the required timeframes during the building construction period.

We continue to service and maintain this feature today.

 

Containerised Dosing Systems – Queensland, Australia

PROJECT SUMMARY: 

As part of to remote water treatment plants in South East Queensland, FSI Engineering was contracted to design and build two identical containerised dosing systems. These systems included the storage, mixing and dosing of Sodium and Magnesium Sulphate into a treated water stream from another part of the treatment plant. Through a long standing relationship H2O Engineering provided specialist design and process engineering services to FSI Engineering for the project including on and offsite commissioning services.

CLIENT: FSI Engineering PTY Ltd (QLD)

PROJECT DETAILS:
As part of our scope we were involved from an early stage in developing the process design of the system through HAZOP studies and

  • Mechanical process and control philosophy design.
  • Detailed mechanical design.
  • Equipment selections.
  • Pre-commissioning and equipment testing.
  • Performance testing.
  • Site commissioning.
  • This project brought together a team of people who had completed several large scale powder storage and dosing systems in Australia over the last 6 years.

 

Completed Dosing System3D Model of Dosing Plant

Inside ContainerEnd View of System

 

Ardmore WTP Powder Activated Carbon Dosing Plant

PROJECT SUMMARY:
As part of the ongoing improvements to the Ardmore WTP, H2O Engineering where contracted to replace the existing Powdered Activated Carbon (PAC) facility with an industry best practice storage and handling facility.
The scope included detailed design, installation and commissioning of the specialist PAC dosing equipment.

CLIENT: Watercare Services Ltd

PROJECT DETAILS:
The unique challenges provided in this project included the need to keep the existing plant operational and the requirement for the new plant to be designed to exceed HSNO Regulation and Hazardous Area Zone electrical requirements for storage and handling of combustible dust.

KEY PARTS OF THE PROJECT WERE:

  • Dose rates ranging from 25-480kg/hr of dry powder
  • Twin dosing trains each with 15m3 powder storage
  • Zone 22 Explosive Dust rating requirements
  • Flexicon Bulk Bag Unloaders and WAM Materials Handling equipment incorporated into plant design
  • Demolition of redundant equipment

Detailed planning was needed to ensure project targets were met. Working with the clients engineering consultants, Mechanical Technology Ltd., the new plant was available for dosing within six months from H2O’s contract award with only one week without PAC dosing capability.

 

Glenfield Learner Pool Filtration Upgrade

PROJECT SUMMARY:
H2O Engineering was awarded the contract to undertake upgrade work at Glenfield Leisure Centre to the Learner Pool Filtration and Heating Plant, repairs to the Main Pool VDE Filter Tank and conversion of the Chemical Dosing System from Chlorine Gas to Sodium Hypochlorite including a pH correction system using CO2 Gas.

CLIENT: Auckland Council

PROJECT DETAILS:
This presented a unique challenge due to the requirement to carry out the installation in a tight time frame to coincide with the planed pool shut down. Also there was a requirement that the primary heating water circuit was kept running to provide heating for the air handling system.

KEY ASPECTS OF THE PROJECT:
Main Pool Filter Repairs

Remove all filter internals and water blast and wash internal surface
Patch repair damaged concrete
Coat internal surfaces with 3-coat epoxy paint system
Re-instate and repair where necessary filter components
Learner Pool Heating System

Dismantle existing Secondary (Pool Water) Heating pipework and booster pumps
Remove all redundant heating pipework
Re-install Booster Pumps and install new Secondary Heating Pipework
Learner Pool Filtration Upgrade
Supply, install and commission a new Pressure DE Filter and Filter Pump including modifications to pipework.
Modify connections for mains water make-up, heating and chemical injection connections.

Chemical Dosing System Modifications

Disconnect and remove Chlorine Gas Storage and Dosing Equipment
Supply and Install a new 4500L Sodium Hypochlorite Storage Tank and new Dosing Pumps for the Main and Learner Pools
installation of a CO2 Dosing and Storage System including Bottle Cage, Auto Change-over System, Distribution Panel and Injection Diffusers.

All the works were completed within the available time frame in 2012.

 

 

Auckland Zoo – Te Wao Nui Area Project

PROJECT SUMMARY:
As part of the new Te Wao Nui area at the Auckland Zoo, H2O Engineering was awarded the contract to undertake Water Treatment and Reticulation work for the various exhibits that make up this new part of the Zoo. The scope for this project included detailed design, installation and commissioning of each of the various systems.

CLIENT: NZ Strong Construction

PROJECT DETAILS:

  • The project was split up into five key areas: Wetlands
  • This section included Reticulation for the Main Pond, Water Fall, Water Treatment Plant and Reticulation for the Eel Tank and a Misting System.
  • Eel Tank treatment comprises of 2 x Sand Filters and a UV Disinfection system and De-Gasser. Night Forest This area comprised of an Aged Water System, Night Stream Reticulation, Giant Kokopu Tank and Kiwi Enclosure Water Features. High Country
    Included in this area are the Reticulation Systems for the Blue Duck and Kea Streams Island Sanctuary
    This exhibit comprises of a Stream System for the Island Sanctuary and a small Pond and Stream for the Tuatara exhibit.
  • Non-Potable Water Treatment Plant
    This part of the project required the partial demolition of an existing plant, installation of a Pre-Filter, 2 x Sand Filters and a UV Disinfection system along with re-instatement of Depth Filtration/Softener Plant. These systems are used to treat water from the on-site bore and water extracted from Western Springs.
  • All the contracted works were completed on time and budget during construction works for the new exhibits in 2011.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Chemical Dosing Systems

Chemical dosing system alternate name chemical water treatment for cooling water, chemical water treatment for chilled water.

Chemical dosing system is widely applied in corrosion, scale inhibition, sterilization and algae removal of the circuiting water systems such as air-conditioning cooling water, chilled water, ice storage, etc.The chemical dosing system can also achieve the effect equivalent to the electronic descaling instrument.In the process of air conditioning circulating water and various purified water, the water quality always decides if the system can run efficiently for a long time.