Dredging Sector
This is made up of the following equipment, machinery and accessories.
- Centrifugal pump or suction pump of 5 inches or 6 inches
- Diesel motor of 18 HP or 36 HP
- Suction hoses of 5 inches or 6 inches, 20 meters in length
- Discharge hose of 5 inches or 6 inches, 10 meters in length
- Compressor of 200 PSI
- Scuba wet suits (suit, mask, mouthpiece, belt)
Out of this equipment, the ones that will be placed through more wear and tear are the pump (interior deterioration) and which require repair every 30 days. The dredging operation or lifting of the material at the bottom from the bottom of the river is done with a centrifugal pump, through the suction hose of which the pump is activated by the diesel motor. The material that has been suctioned by the pump is emptied out through the discharge hose chute and into the washing sluices. The material that has been suctioned is made up of a water pulp and gravel and not any type of technical control is carried out by the owners of the rafts as reference to the relation of the water and gravel that goes through the pump, therefore, the volume of processed gravel per unit is unknown of. On the other hand, it has been observed that the density of the pulp was variable during the process, and this possibly depends on the experience and skill of the scuba diver in the handling of the suction hose as well as the changes in the dredging sectors. The average dredging depth in the area was of 12 meters having in some cases gone to 18 meters. In reference we will mention that according to bibliographic information a suction pump of 6 inches lifts 150 m3 of pulp per hour, out of which 4.5 or 7.5 m3 are solids, this obviously depending on the particles sizes of the material mainly, and that in the same way they have a suction capacity of up to 30 meters in depth for the case of the suction of the slurry. The dredging control is looked after by the scuba divers who take 3 hour shifts in a 9 hour working day, in order to provide air to the scuba divers a 200 PSI is available and the control of the air is carried out through a hand pump that is located on the deck of the vessel. The personnel that work in this section are made up of three scuba divers who carry out a 9 hour day.
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