Edwards XDS and nXDS Range of Dry Scroll Pumps For Marine have become the industry standard when dry pumping is essential, proving to be a robust and clean vacuum pump solution in a range of applications. Now, a combination of the patented double start scroll form technology and by-pass valves have enabled Edwards to offer the XDS35i Enhanced range of pumps to complement our original family.

Main Fire Pumps :

The main fire pumps installed on ships are located inside the ship’s engine room, usually at the bottom platform. They are electrically driven from the main supply of the ship. It is very common to find them installed near general service pumps and ballast pumps. The general service pump lines are interconnected with the fire main and at times are used to provide water to the fire system. In some settings, they are also called general service and fire pumps. These pumps should not be used for pumping oil in any case. A changeover arrangement may be provided to use the main fire pump for general service, only when it is approved by the administration.

The general service and fire pump supply water to the following:

1. To the fire hose connections in the engine room, main deck, accommodation, shaft tunnel, steering gear room etc.
2. To the anchor washing at forecastle.
3. As driving water for the ejector fitted in the cargo hold bilges.
4. As driving water for the ejector fitted in the dangerous cargo hold bilges.
5. To the swimming pool, if fitted.

Capacity & Requirements for Main Fire Pumps:

The number of fire pumps and their capacity will depend on the type of ship and its gross tonnage.

For Passenger ships –

• Passenger ships of less than 4000 GT should have at least two independent fire pumps.
• For passenger ships more than 4000GT, there should be at least three independent fire pumps installed.
• The fire pump should be capable of producing a quantity of water not less than 2/3^rd of the quantity given by bilge pumps.

For Cargo Ships :

• For cargo ships of more than 1000GT, at least two fire pumps should be installed with an independent driving arrangement.
• For cargo ships that are less than 1000GT, the number of fire pumps to be installed will be decided by the administration.
• The installed fire pumps should be capable of discharging a quantity of water not less than 4/3rd of the quantity given by bilge pumps in a passenger ship of the same dimension, provided that the total required capacity of the pumps need not exceed  180 m³/hr in a cargo ship.
• Each main fire pump for cargo ships shall have a capacity not less than 80% of the total required capacity divided by the minimum number of required fire pumps but not less than 25 m3/hr with at least a discharge of water with 2 jets.

Bearing shield ensures separation between process gases and bearing lubrication to ensure a clean vacuum and no possibility of contamination to lubrication from process gases, which prolongs bearing life. A simple single-sided scroll design allows maintenance to be done in minutes for the low cost of ownership and maximum up-time.

Edwards nXDS dry scroll pump

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Source : www.edwardsvacuum.com