HIGH QUALITY PROPELLER REPAIR SERVICES
BEVALDIA (Manager of the branches PSOMAKARA & GAMSRO) has extensive experience in underwater propeller repair, having experienced professional divers with specialized training. Any deformation to the actual shape of the propeller may cause imbalance in its operation, vibrations, which in turn cause an increase of cavitation, loss of thrust control, leading to damage to the tail-end shaft and an increase in fuel consumption.
For this reason the tactics of propeller repair is necessary. Propellers should always be kept in excellent condition. The main factors that reduce the optimal operation of the propeller is pollution, cavitation and damage due to hits. Any deformation of the actual shape can cause imbalance and therefore vibration, which in turn causes increased cavitation, loss of thrust control, leading to damage to the tail-end shaft and increase in fuel consumption. The underwater propeller repair is the fastest, most efficient and most economical way to repair the propeller of the ship, since it keeps it away from the dry-dock, which on one hand takes a long time and on the other hand has a very high cost.
Usually involves damage caused to the edge of one of the blades. A ship with bent or cracked blades can suffer severe vibration and cause engine overload at sail. For this reason the propeller repair is necessary to obtain approval from the ship classification society for sailing. Prior to the underwater propeller repairs a detailed underwater inspection is carried out, the problem is analyzed and the best solution for underwater propeller repair is decided in consultation with the technical department of the ship owning company.
CLEANING AND POLISHING
The accumulation of fouling and calcium deposits significantly increases the roughness of the propeller, which results in increased fuel consumption and gaseous pollutants. The more often the ships propeller is cleaned, the more money is saved since the fuel consumption is reduced.
REMOVAL OF FOREIGN BODIES
Removal of foreign bodies such as mooring ropes, fishing nets or lines that are usually tangled in the tail-end shaft or the bow thruster, which are removed by cutting. The entanglement of ropes in the tail-end shaft is a common problem in the cases during ship to ship operations in bad weather conditions. This problem, if not treated quickly may be fatal to the tail-end shaft, as the ropes can melt and go inside it.
THE UNDERWATER BALANCING PROPELLER
The propeller shaft is strained because of the disorder generated from the balance of the weight thereto. Thereby creating hazardous loads on the shaft bearings system due to the constant vibration and the risk of causing serious damage. For this reason it is necessary to balance the propeller (underwater balancing propeller) on the rotating shaft to prevent stress from the centrifugal force, thus contributing to a better hydrodynamic behavior.