Project Overview
Saltire were engaged by Rob Carr Pty Ltd to assist in providing bypass set ups to an existing water main requiring replacement as part of the Denny Avenue Level Crossing Removal works, which forms part of the overall MetroNet program. The existing water main provided supply to significant commercial properties and required to be maintained during the works.
Saltire Infrastructure utilised 3 technologies to assist in this requirement, namely Hot-Tapping, Line Stopping and the Hawle System 2000 HDPE mechanical coupling.
Client:Rob Carr Pty Ltd
Scope:Providing bypass set ups to an existing water main requiring replacement.
Key Elements
To maintain this supply, an overground DN180 HDPE by-pass pipeline was installed along the property boundaries and installed underneath driveway accesses. This by-pass was installed using the Hawle System 2000 mechanical couplings in lieu of traditional welding methods, due to time constraints and availability of panel approved welding contractors.
Upon successful pressure test of the new by-pass main, the existing main was hot-tapped through a valve and connected to the new by-pass. With both mains live in parallel, all service feeds were transferred to the new by-pass main. With all services transferred, the existing main could now be decommissioned, which is where Saltire utilised the line-stopping equipment to facilitate cutting and capping of the existing mains, making the pipeline redundant and safe to replace.
This case study demonstrates the successful integration of 3 technologies within the Saltire business to provide an overall project solution to the benefit of clients and stakeholders. The installation of a by-pass pipeline with mechanical couplings on potable water supply is the first of its kind for Perth W.A. providing this innovation significantly enhanced the overall works program on a time critical project.
Significant Achievements and Benefits
The by-pass was installed and commissioned in just one day, and all services along the affected area were successfully connected. The quick and efficient installation of the by-pass ensured that it was possible to line-stop without isolating the mains, which provided continuous water supply to the commercial businesses not only during the bypass installation process, but also for the duration of the main works program.
The Saltire Advantage
Eliminate Shutdowns & Outages
Ensuring the continued operation and supply of water to stakeholders.
Reduce Construction Footprint
Reduce excavation work and traffic management with location-specific isolation solutions.
Safer Equipment
Safe, modern and efficient equipment engineered to comply with international and Australian standards.
Reduce Environmental Impact
Eliminate loss of treated water on the network by redirecting supply during maintenance work.
Save Money
Save an average of 40% of installation and repair work by eliminating 100% of the costs related to system shutdown.
Service
Saltire provides reliable and emergency services you can count on and customised for your needs.
Innovate
Our dedicated focus on the water services sector means we have our finger on the pulse in the latest technologies and industry developments. We think outside the box to develop the best solution for each product.
Deliver
Our commitment to safety and professionalism means our focus is on projects being delivered on time, within budget, and to the highest standards of safety, quality, and environmental management.
Excel
Our mission is to exceed client expectations in terms of safety, presentation, engagement, and delivery. Our performance is monitored through both formal and informal feedback as part of our continuous improvement initiatives.
Our Capabilities
At Saltire, we pride ourselves on delivering intelligent, tailored solutions for water infrastructure. Our expertise spans from major project consultancy in civil construction to rapid emergency repair works, ensuring reliable and efficient water networks at every scale.
Wastewater Infrastructure
We deliver wastewater infrastructure that’s built to last—prioritising durability, performance and client needs across every project.
Design and Construct
End-to-end design and construct solutions delivering smarter, sustainable water infrastructure—engineered for efficiency, durability and performance.
Project Management
From concept to completion, we manage projects with precision, collaboration, and a focus on delivering results.
Civil Construction
Saltire delivers end-to-end civil construction services with a flexible, client-first approach—ensuring quality outcomes across roads, drainage, earthworks, and concrete works.
Dry Vac Excavation
Saltire’s dry vac excavation services for safe, non-destructive underground asset exposure, ensuring precision and environmental responsibility.
Pipeline Condition Assessment
Saltire offers expert asset condition assessment services for pressurised pipeline inspections, leak detection and mains tracing.
Valve & Hydrant Replacements
Saltire’s efficient valve and hydrant replacement services, ensuring minimal disruption, future access, and reliable infrastructure solutions.
Emergency Repair Works
Swift and efficient emergency repair services ensure pipeline integrity and minimise downtime, safeguarding communities and resources.
Industry Leading Technology
We harness a unique mix of technologies and solutions to ensure your system continuity during repairs. This includes hot tapping, flow stopping and s-gate valves.
Live Water Mains Inspection
Advanced live inspection technology detects issues in pressurised pipelines—maintaining network integrity without isolations, shutdowns, or service disruption.
Hot Tapping
Saltire Infrastructure utilises high-pressure rated Hot Tapping Equipment for the fast and safe installation of new branch connections and bypass mains, with the current capability to install DN25-DN400 offtakes.
Flow Stopping
Line Stopping allows works to be undertaken on water mains without interruption to customer supply. Deploying a stopper and bypass system, the rig set-up allows for sections of pipelines to be made dry allowing safe repair or replacement of the existing network.
S-Gate Valve
Saltire Infrastructure’s S-gate Valve System is a WSAA-approved live insertion valve system, designed to be used on live under pressure pipelines, providing mechanical isolation on the network to operator’s requirements and a future asset on the pipeline network to be used time and time again.
Our clients rely on us to innovate, deliver and excel.
Our team possesses a strong understanding of client requirements and we focus on building long term professional relationships and exceeding expectations within safety, quality, and environment. Being a Western Australian owned and operated company, Saltire supports local communities by prioritising partnerships with WA suppliers and Contractors.
"I wanted to take a moment to express my appreciation for the excellent work your team did during the hot-tapping operations in Allanooka. The quality of work and professionalism exhibited by everyone on the team was truly impressive. We were particularly impressed with the care and precision with which all equipment was operated."
P. Lee
Senior Project Manager - Rob Carr"The whole job was exceptionally organised and the teamwork between the crews was seamless. That is the level of preparedness and safety we strive for on all work, especially nightshift. The feedback from the Operations Manager, Communications Advisor, and local customers have all been full of praise for the work."
J. Collier
Project Leader - Water Corporation“Saltire successfully delivered works for the Armadale Line Upgrade Alliance (ALUA), including self-performed Water Corporation relocations for the Beckenham, Cannington, and Wharf Street packages. Saltire demonstrated strong performance, meeting the standards expected on a Tier 1 project.
Despite site complexities and programme challenges, Saltire maintained a strong commitment to safety and delivered the works in alignment with the ALUA schedule.
Saltire’s proactive approach to stakeholder engagement and problem-solving was a key factor in the project’s success. Their flexibility in adapting to evolving site conditions and ability to coordinate efficiently with other contractors contributed significantly to minimising disruptions and ensuring the seamless delivery of critical project milestones.”
S. Doogan
Delivery Manager - Armadale Line Upgrade Alliance“Being unable to carry out our traditional in-house inspections under isolation due to no contingency for supplying over 30,000 homes, we had to look for an alternative solution.
Previously working with Saltire on other projects using other equipment, we were confident the job would be delivered successfully. Working in an environmentally sensitive area and in a complex excavation, the team delivered beyond expectations. Utmost professionalism from scope to delivery”
Specialist, Inspection & Condition Assessment, Engineering Department
Water Corporation WA
