Reduced Vacuum Pump Noise For Ship Application

Edwards’ acoustic enclosures are the ideal noise reduction solution for use in a laboratory or an industrial environment. The specially designed soundproof enclosures are made of materials with high noise absorption, reducing vacuum pump noise by up to 9 dB(A), with no impact on vacuum pump efficiency.

Two integrated air cooling fans provide ventilation to maintain optimum pump running temperature; this is backed by an over temperature buzzer alarm (with battery back-up) for that extra peace of mind.

For a seafarer, working on a ship means dealing with several challenges on a daily basis, for which, he/she needs to be prepared at all times. Fire pump on a ship is an essential machinery which helps seafarers to tackle extreme emergency situations involving fire. These marine firefighting pumps are also popularly known as Marine Fifi Pumps.

Usually, centrifugal pumps are used as marine fire pumps as they have high flow capabilities and can swiftly handle water and foam. In the event of a fire on a ship, it is very important that sufficient water is available at apt pressure, and an alternate arrangement is made in case one fire pump fails to operate or its controls are inaccessible. For this purpose, multiple marine firefighting pumps are required on board.

The design of the enclosure allows for easy assembly or disassembly without complex tooling. A removable front panel enables quick visible access to the oil sight glass, and if required a side panel can be quickly removed for access to the oil filter cap (RV/EM only).Our acoustic enclosures are fully compatible with all RV rotary vane pumps, E2M18/28 rotary vane pumps, and the complete range of nXDS and XDS dry scroll pumps.

Features and benefits

• Simple slot together assembly/disassembly with no tools
• Noise reduction of the E2M28 by 7 dB(A) and the XDS35i by 9 dB(A)
• Castor wheels with brakes make the enclosure and pump easy to move and lock into place
• Integrated cooling fans maintain optimum pump running temperature
• Over temperature buzzer alarm with battery back-up for added security
• Easy access for vacuum pump maintenance
• Powered via a power cable fitting into an IEC 320 socket

Technical Data

Mass
RV/EM	23 kg
nXDS/XDS	37 kg
Electrical supply for cooling   fans
Voltage	100-120 V/200-240 V
Fuse rating	5 A Type T 20 mm
Connector	IEC320 socket
Approximate noise reduction
RV	7 dB(A)
E2M28	7 dB(A)
XDS35i/46i	9 dB(A)
XDS5/10	8 dB(A)
nXDS	5 dB(A)

Dimensions mm (inch)

Dimension	RV/EM	nXDS/XDS
A	790 (31.10)	778 (30.63)
B	285 (11.22)	442 (17.40)
C	460 (18.11)	580 (22.83)

Ordering information

Product description	Item number
RV/EM acoustic enclosure 100-120 V	NRD317000
RV/EM acoustic enclosure 200-240 V	NRD318000
nXDS/XDS acoustic enclosure 100-120 V	NRY5C0000
nXDS/XDS acoustic enclosure 200-240 V	NRD797000

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 pump 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 pump. 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 the 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 pump should be installed with an independent driving arrangement.
• For cargo ships which 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 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 discharge of water with 2 jets.

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Source : www.edwardsvacuum.com