REVISION AND REFURBISHMENT OF MECHANICAL SEALS
Refurbishment and overhaul service for individual mechanical seals
Refurbishment is a process by which a worn-out seal is returned to the configuration profile it enjoyed at manufacture.
It is possible, through this process, to reduce costs and the downtime of the seal especially on products made for specific applications and which thus always require time-consuming delays on the part of the manufacturer. Each seal received is carefully examined and assessed, and all its parts are thereafter completely dismantled.
If a component cannot be refurbished, the client is offered the choice of reconstructing it. After repair, the seal is subjected to final testing. We can refurbish mechanical seals for pumps, compressed air and gas machines, turbines, agitators, up to 600 mm in diameter.
Assessment is carried out in the metrology lab, where we can use cutting-edge instruments with which each component can be evaluated with maximum precision. The new test bench is the key point of the laboratory.
We are able to test mechanical seals replicating functionality in the machine, relating to speed, pressure, temperature and the process medium. At present tests for rotation at 20,000 rpm and pressure at 150 bar (2176 Psi) can be effected.
Lapping machines employ innovative patented methods by vaporising synthetic diamonds which ensure optimal results up to 0.1 µ.
Furthermore, the technology employed makes it possible for us to have a lapping plate for each type of material to be worked (graphite, ceramic, steel, carbides)
RECONDITIONING ROTORS
Reconstruction individual design pump rotors
The impeller of a pump makes it possible to generate enough force to move or pump a liquid. It is an essential part of every pump to lift liquids, or a rotating part which receives the thrust of the liquid and thus creates energy. Depending on its form, each impeller is denominated accordingly and above all is able to generate different pressures and flows. RAEM (Pty) Ltd can provide reconstruction services to its clients for any kind of impeller which can be made in an assortment of materials (cast iron, bronze, brass, stainless steel).
The construction of an impeller rotor goes through various phases in the manufacturing process.
PHASE 1
Firstly, a model is made, i.e. an object making up the profile of the final product and consisting of any range of materials: e.g. wood, metal, chalk, synthetic resins – each material has merits and shortcomings; e.g. wood can be easily worked and is light, but has the disadvantage of low surface durability and is wont to wear out.
Next, comes modelling, where the model maker has the task of making up a model or prototype of the product to be manufactured. The model maker is a designer who converts creative ideas into products in the framework of industrial production. Such work consists in translating creative models of the fashion designer using traditional tools like a concrete model or innovative programmes for 3D profiles into reality.
The foundry is the branch of metallurgy which goes through the productive processes to create metallic objects by smelting and casting metals into the correct forms, or even hollow objects which will provide the piece with its form.
The pieces created are called castings or alloys in which are smelted brass, bronze, cast iron etc.)
Impeller 1 – Phase 1
PHASE 2
The moulding in a transitional form can be achieved with the use of a permanent model and this is the case for sand foundries, the classical foundry work of die casting in special sand, called foundry sand, where molten metal is poured into the die which, at the end of the process, can be broken open to reveal the piece.
Impeller 2 – Phase 2
PHASE 3
The final piece is turned, balanced and painted for dispatch to the client
Impeller 3 – Phase 3
ARMATURE REWINDING
Professional, fast and accurate
RAEM (Pty) Ltd works professionally, promptly and with precision in furnishing armature rewiring services for burnt wiring of any type, whether in copper bands or wires, and is the only service for upgrading and repairing undercutting of the collector in cases where the armature has not burnt but is worn. The armature is stripped of its copper and wound with new copper coils, the wiring being insulated with resin coating and thereafter balanced, thus replacing the entire collector.
Orders are usually executed rather rapidly, with the exception of non-standard armatures which need time for finding an available collector.
A few examples of possible rewinding:
- Pantographs, grinders, saws, drills etc.
- Armatures for forklifts, travellators and many other types.
AXIAL FANS
Supply of axial fans of various types.
We can procure axial fans of various kinds and sizes, in aluminium alloy or polypropylene fibre glass.
Providing us with technical data including the outside dimensions, the diameter of the spindle, motor strength, number of rotations and capacity, will enable us to provide a detailed quotation.
