We provide repair services

underwater and at height.

Dive Marine Services handles all the underwater repair services whereas DM NDT takes care of repair services at height.

This distinction provides you with the most experienced and qualified team that is suited to the job on hand. Oftentimes, teams from the two companies – Dive Marine Services and DM NDT – work hand in hand; giving you the convenience of working with a single point of contact.

The full list of services we provide
  • Afloat repairs
    • Propeller cold bending
    • Aft seal renewal
    • Bow thruster replacement
  • Wet welding & cutting
  • Underwater sealing of leakage
  • Removal & installation of thruster units
  • Vessel Repair
    • Welding & fabrication (certified 6G/R welders & fabricators)
    • Insulation repairs, cladding & fabric)
    • Electrical installation & inspection testing – insulation, HIPOD, EX Compex
    • Heavy lifting & rigging
    • Remedial painting – mechanical surface preparation
  • Storage tank sprinkler head cleaning/replacement
  • Fire monitor repair
  • Loading arm repairs
  • Valve blinding/de blinding
  • Structural upgrades, modifications & repairs (derricks, topside modules, tanks & platforms)
  • Welding & fabrication (spool bracket installation, steel removal & replacement, pipe installation & removal – certified 6G coded welders & pipe fitters)
  • Remedial mechanical surface preparation & painting (mechanical surface preparation with multi – coating application}
  • Heavy lifting & rigging works (certified & approved riggers)
  • Hydro-tight tensioning & bolt torqueing (certified & approved technicians)
  • Electrical engineering (cable pulling & termination – installation & modifications of cable trays)
  • Mechanical engineering
  • Anode installation & removal
  • Flare tip (removal – repair – replacement A-frame or helicopter operations)
Underwater repair specialists

When it comes to specialist repair services, our team excels in

Propeller damage repairs

  • We know that propellers are easily damaged if they strike a buoy, floating logs, debris or ice. The damage is usually located at the tip of the blade, which can become bent or chipped off. Physical damage of this nature commonly causes vibrations. The solution to solving the vibration problem is to trim the blades equally to remove the damage and achieve a proper balance and at the same time reduce excessive cavitation. The technique used requires extreme accurate measurement of the diameters of the individual blades to reduce a minimum the amount of material removed and to ensure a perfect balance of the propeller.
  • When trimming damaged blades, the nature and location of the damage dictate the type of repairs requires. Modification had to be made according to the desired effects on the rpm and thereby restore the RPM/MCR ratio. There are mainly three types of modification:
    • Diameter reduction – Easily and inexpensively performed underwater, this is the usual method for increasing rpm and balancing the ratio. The blade tips are cropped and faired.
    • Pitch reduction – This involves twisting the blades and can only be accurately done in a workshop as the blades need to be heated to prevent cracking. The twisting usually distorts the hub and requires machining to ensure proper re-fitting to the shaft. This is one of the most effective modifications as there is no loss of blade material and it ideally suitable for propeller blades smaller than 3500mm in diameter.
    • Trailing edge modification – It is performed by bending the trailing edges or by cutting them off. Either of them can be performed underwater and can achieve an effect on the rpm. In the process of bending the trailing edges of the damaged blades, the trailing edges are slightly modified without the loss of materials or strength of the blade. With cutting, a small amount of trailing edge material is removed and the edge re-ground to smoothen the cut edges. Templates are used to ensure accuracy.

U/W Welding/Cutting/Sealing

We utilize top tools and techniques, such as Hydroweld and Broco electrodes for external or internal repairs, that are proven to produce the most constant temperature delivery for the best weld quality possible.

We place high emphasis on the competency of our underwater welders. We are AWS D 3.6 Wet-Welding certified, and approved by DNV.

Underwater sealing of leakage hole using double bolted “sandwich” type to secure the 10mm leakage hole with epoxy application.

Find out how we can help

Repair – at height – specialists

We undertake a range of specialist repair tasks such as

  • Storage tank sprinkler head cleaning/replacement
  • Fire monitor repair
  • Loading arm repairs
  • Valve blinding/de blinding
  • Structural upgrades, modifications & repairs (derricks, topside modules, tanks & platforms)
  • Welding & fabrication (spool bracket installation, steel removal & replacement, pipe installation & removal – certified 6G coded welders & pipe fitters)
  • Remedial mechanical surface preparation & painting (mechanical surface preparation with multi – coating application)
  • Heavy lifting & rigging works (certified & approved riggers)
  • Hydro-tight tensioning & bolt torqueing (certified & approved technicians)
  • Electrical engineering (cable pulling & termination – installation & modifications of cable trays)
  • Mechanical engineering
  • Anode installation & removal
  • Flare tip (removal – repair – replacement A-frame or helicopter operations}
Find out how we can help