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Flying fox/cableway to apply Protective wrap to angled tendons.

As part of our clients 15 year building inspection process we were contracted to report on any corrosion on the light tower structures including the tendons. Minor corrosion was found during our inspections at a few of the socket connections and the client requested the application of a multi-step paint and wrap protection system with a 30 year warranty.

The application process involved four stages. 1. The initial clean and preparation of the joint using a grinder with a wire cup brush. 2. The application of a bituminous paint system. 3. The application of a protective wrap. 4. The application of a UV stabilised paint system to protect the wrap. Each step of the process was photographed and catalogued as part of our QA process.

The application process in itself wasn't particularly difficult. Access however was another story. As each of the 7 tendons on each tower are on varying angles. Propping towers where built at the base of each to support 2 3.2t tensioned turfor wires while slings where installed to the tower itself above the tendons. We elected to use a cable way set up to provide access to all sides of the tendon for the application of the protection system. Access was via a ladder inside the tower itself. Then vertical descent from the top of the tower platform down to the top of the cable way. Then transferred onto the cable way and descent down the cable way to work on each joint in the tendons. Work was completed with no incidents, on time and with a very satisfied client.


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Emergency removal of 11.8 tonne Outlet Device

The Call went out late on a Thursday night that there was a crack in the drive shaft of the outlet device that was causing the scraper arm to vibrate in the bottom of the #3 continuous digester (CD) at Oji Tasman, Kawerau. A late night trip to our rigging loft in Hamilton to pick up 4 10 tonne chain blocks, 9 tonne lever blocks, 10 tonne beam trollies, 200 plus meters of slings and associated rigging gear required. Our team arrived on site at 3am Friday morning and started pre-rigging gear which required us to drop 6x35 meter dropper slings from the outside of the CD while the client continued to empty the digesting vessel of product

At 4pm Friday afternoon the vessel was cleared for atmospheric testing. One of the ISS confined space team carried out the testing and cleared the vessel for entry. The ISS team of riggers started installing the rigging gear inside along with a team of our scaffolders who built access platforms around the base of the vessel for the riggers and fitters to use to install rigging gear and unbolt the ancillary pipe work. A scaffold access platform was also build inside the digester so the dropper slings could be accessed to give enough head room to remove the internal cone, china man’s cap and the rotating scraper arm.

Our night shift team started at 5pm Friday night and removed some of the ancillary equipment inside the vessel using the 6 dropper slings to allow access to rig in and install the lifting shaft and stop collar in to the outlet device. The team also installed the proprietary rigging attachments and beam trollies to allow the outlet device to be rotated as it was lowered out of the digester vessel.

At 5am our weekend dayshift turned up as the fitters finished unbolting the main bolts connecting the top flange of the outlet device to the digester vessel and started the delicate process of extracting the outlet device from the basement. Lowering while also transferring the weight onto a second lifting point attached to a gantry rail to both rotate the outlet device 90 degrees to fit out through the door. Once it was halfway out the door the front of the outlet device was transferred onto the main hook of our 30tonne crane. This allowed the team to float the front end out while the rear end was tailed out on the gantry rail. A second pre rigged 10tonne chain block was then connected to the rear of the outlet device and all the weight (11.8 tonnes) was transferred to the main hook of the crane and lifter away from the digester. We then backed our heavy lift trailer underneath and transported it to a local engineering shop for the shaft to be replaced.

Key Points:

  • The 11.8 tonne outlet device is completely hand rigged out through the basement of the digester vessel.
  • From the time the team was allowed internal access to digester it 12 hours until the outlet device was on the back of our truck. This was 11 hours ahead of schedule.
  • Around the clock emergency cover was provided with no notice.
  • All rigging equipment was able to be supplied in house.
ISS Cobham 3-398
Scaffold of the Year – Industrial Site Services – Cobham Bridge Scaffold Hamilton

ISS were awarded this job by the by Napier Sand-blasting on behalf of Hamilton City Council to erect a 140M access scaffold including dust containment, so the bridge could be sand-blasted and repainted. This job required a vast amount of gear so the blasters could get access of the bridges’ underside. The working deck was suspended under the girders so the painters could gain access to all the areas of the bridge.

Some of the challenges that were overcome to complete this project were; maintaining 2 pedestrian corridors so there was no disruption to foot traffic at either end of the bridge, having a minimal amount of connection points on to the bridge for painting purposes and access to the worksite was through council parklands so care have to be taken at all times to preserve the environment around the site from vehicle movements. During the strip phase, care also had to be taken so that zero paint and or blast material was dropped or leached into the river.


ISSL are proud WINNERS of the SARNZ  RIGGING JOB of the Year for 2013
Congratulations to our Eastern Bay of Plenty branch for winning the SARNZ Rigging Job of the year, for the relocation of a 90 Tonne YANKEE CYLINDER at the SCA Pulp and Paper Mill in Kawerau.



Industrial Site Services Co Ltd has branches situated on 5 sites throughout New Zealand,  Marsden Point, Whangarei, Kawerau EBOP, Waihi WBOP and Hamilton and in Australia and if we are not in your area we are happy to travel to view the job and discuss your requirements.

Head Office  
13/14 Bristol Pl   
Te Rapa             
Hamilton 3200
New Zealand

0800 800 679

P  07 850 1240
F  07 850 1241

E iss@iss.co.nz     
P O Box 10234
Te Rapa
Hamilton 3204  
New Zealand            


Why Choose ISSL?

We are a specialised contracting company meeting the needs of the construction and manufacturing industries in New Zealand and around the Pacific.  We have several teams of experienced men who work along side our quality clients   ISSL is a recognised achiever in the more difficult project tasks and in particular maintenance and construction shut work at major installations such as power stations, cement works and pulp and paper plants. READ MORE

Contact Us

0800 800 679

Email: info@iss.co.nz
Our Office
13/15 Bristol Place, Te Rapa, Hamilton
Hours: 7.30am - 5pm Monday to Thursday & 4pm  Friday