Case Study: Rydges Wellington Post Tensioning Job

About Jonel Hydraulics and What We Offer

Jonel Hydraulics is a leading New Zealand-based hydraulic engineering company that specialises in the design, manufacture, and supply of custom hydraulic solutions. With over 30 years of experience, they provide a range of services, including hydraulic system design, installation, and maintenance, as well as hydraulic component repair and replacement. They work across various industries, including marine, mining, and forestry, providing high-quality and reliable solutions to meet their clients’ unique needs. Jonel Hydraulics prides itself on delivering exceptional service, innovative solutions, and quality workmanship. Their commitment to customer satisfaction has earned them a reputation as a trusted and reliable partner for hydraulic engineering services.


We teamed up with Brian Perry Civil as they encountered a challenging post tensioning situation at the Rydges Hotel in Wellington. The project required the pulling of 3 pairs of 56mm VSL rod to 1781kN each, with less than 800mm of working room. The project team needed to find a solution that would accommodate the large diameter VSL nuts and meet the project’s tight timeline.


The project team teamed up with Jonel Hydraulics Ltd in Auckland, who supplied 2 Enerpac EAJ8LC Subsea tensioners with a maximum capacity of 2320 kN and 247mm profile. Additionally, Jonel Hydraulics supplied a couple of bespoke chairs to accept the large diameter VSL nuts. The air powered hydraulic pump running at near 16,000psi/1100bar required some head scratching, but in the end, the whole package worked perfectly. Remarkably, the jacks weighed a meagre 24kgs.


Shane Quigley from Jonel Hydraulics spent a significant amount of time discussing different options with the project team. There was a lot of back and forth, but ultimately, the gear was machined and delivered in an extremely short timeframe. David Hoffman provided excellent support, taking phone calls from the project team during the depths of the Covid pandemic. Jack Gillard handled the mathematics, and ultimately, the tensioning works, while Simon Fulford made everything happen.

2 Enerpac EAJ8LC Subsea Tensioners
Portlander’s Bar and Lounge Area


Thanks to the innovative solution provided by Jonel Hydraulics, the project team could pull the VSL rods to the required tension. Despite the challenging working conditions, the solution delivered outstanding results while meeting the project’s tight timeline. The successful completion of the project demonstrates the power of collaboration and innovative problem-solving in the corporate world.


Why Choose Jonel Hydraulics

Are you looking for a reliable partner for your hydraulic engineering needs? Look no further than Jonel Hydraulics. With over 30 years of experience, we specialise in providing custom-designed hydraulic solutions for various industries, including marine, mining, and forestry. Our commitment to exceptional service and quality workmanship has earned us a reputation as a trusted partner for hydraulic engineering services. Whether you need a new hydraulic system design, installation, or maintenance, or hydraulic component repair and replacement, we’ve got you covered. Contact us today to discuss your hydraulic engineering needs and experience the Jonel Hydraulics difference.