WELDING AND MAGNETIC PARTICLE TESTING
The company takes Underwater Welding extremely seriously, only allow Divers with specific Welding certifications to undertake welding works. The East West Dive and Salvage dedicated welding team can conduct coded structural welds both above and below water. The company has the equipment, certifications and procedures in place to undertake above and below water welding operations at short notice.
• Four ADAS accredited divers with Llyod’s Register Welders performance Qualification Certificate 3.6 holding 2F,3F and 4F codes for 6mm fillet welds
• Qualified weld procedure specifications owned by East West Dive and Salvage
• Experience which includes installing over 6km of weld length combined since 2015 at four separate locations in Victoria and NSW
The company holds a variety of Qualified Weld Procedures to which the weld team are coded to maximize cost efficiencies and lead times for structural welding requirements; these include 6mm and 8mm continual fillet welds in 2F, 3F and 4F position welds. Holding these WQP and codes means the lead time for most welding tasks is minimal.
In addition to welding operations East West Dive and Salvage has a separate team which can conduct Magnetic Particle testing of existing welds and newly installed welds.
• Three divers with CSWIP 3.1 and 3.2 non-destructive test certifications
• Magnetic Particle testing unit
• Capabilities, vessels and equipment to conduct MPI testing as night works
ULTRA-SONIC THICKNESS TESTING
East West Dive and Salvage have recently been involved in conducting over 25,000 UT Tests above and below water at Webb Dock Victoria. The company has 3 Ultra-sonic thickness testing units available to test the thickness of metals including the steel piles and sheet pile wall.
The equipment used for the UTT is the Cygnus Dive, M1 unit. A wrist mounted, submersible unit worn by the diver. This device is capable of measuring several types of metal including those that are coated. Different probes allow measurements from a minimum thickness of 0.05mm to 250.00mm in increments of 0.05mm. The accuracy of the units are +/- 0.05mm. Calibration is achieved by testing each M1 unit against 2 NATA calibrated test blocks and then verifying these results against a separate test piece of a steel with a measured thickness. This calibration method exceeds those set out in the manufacturer’s instructions.
Calibration is performed prior to each dive and again at the end of each dive. The calibration sequence is recorded on EWF-OP-0010 each time it is performed. All divers that conduct UTT have undergone an in-house training session and assessment to prove that they have an adequate knowledge of the M1 unit’s operation. As each test is taken, the results are then communicated to dive control, who then recorded them.
Each test point is scraped clean of any new corrosion or marine growth if needed and the ultrasonic probe is placed against bare steel to attain a thickness measurement. The measurement is conveyed to the dive supervisor who records it on a test sheet. Where a measurement is skewed from collected data this measurement will be repeated.During the UTT survey procedure, the divers are also reporting on any damage to the pile including dimensions and descriptions of holes and pitting in the steel.The below picture typifies the damage that was seen by divers at Webb Dock Project. In this example a small hole is shown to the right of the identifying card, represented by an area of thinning steel that has corroded to the point of exposing the concrete core.
THERMAL LANCE BROCO CUTTING
Thermal lance or Broco cutting is an extremely effective method of cutting above and below the water. East West Dive and Salvage have recently utilised Broco Cutting at Webb Dock to conduct the removal of above water bracing beams to allow access under the wharf and remove non-structural bracings that have proven to be hazardous.
EWDS have several Pressure washers available for use to clean above and underwater.
The pressure washers have diver controlled pressure wands regulated from 3000psi - 5000psi to ensure the removal of soft and hard marine growth but maximise the divers safety. These pressure washers can be set up on the wharf or on Westerly and Malae barge to conduct cleaning as required for application of repair system.
• It will be beneficial but not essential to have mains water supply on side to supply water to the pressure washers