• About Rainbow
  • Refurbishment Services
  • Specialized Services
  • Gallery
  • Contact Us

Mud Motor Rotors

Rainbow carries out reconditioning of mud motor rotors by replacing damaged protective coatings, repair of rotary connections and joining of two damaged rotors in quick turnaround times.

Tungsten Carbide Coating

Protective coatings are provided in the form of hard chrome plating or tungsten carbide (WC) coating by HVOF process. These coatings are provided by sophisticated machinery which is supported by skilled technicians for finish polishing providing excellent surface finishes and dimensional accuracy. These skilled technicians also carry out the finish polishing of hard chrome plated rotors. In certain cases, chrome plating is replaced by tungsten carbide when the pitting depth on the rotor is found to be higher than that recommended for hard chrome plating.

Micro porosities formed during coating are filled by the densification process. Rainbow provides densification using chemical sealants and baking which increases the life of the coating.

Hard Chrome Plating

The Chromium coating is a desirable solution due to its inherent protective and corrosion-resistant characteristics. Hard Chrome can be applied to all types of stainless steel alloys, ferrous and nonferrous metals including copper and brass. In certain cases, chrome plating is replaced by tungsten carbide when the pitting depth on the rotor is found to be higher than that recommended for hard chrome plating.

Regularly plated components include:

Oil field equipments
  • Mud pump rotors
  • Mandrels
  • Mandrel extensions
  • Drive shafts
Marine & Hydraulic components
  • Rotary cylinders
  • Ram shafts
  • Plungers
  • Piston rods
  • Hydraulic cylinders

Stub Welding / Weld Insert Repair

Rotary connections on the box side are repaired by stub welding or weld insert repair and on the catcher side by sleeve welding or re-chasing. Rainbow has approved welding procedures with skilled welders for stub welding and sleeve welding followed by stress relieving with the help of portable furnaces.