Edwards believes in delivering results that bring value to our customers by using our breadth of industry experience to identify and apply solutions to your problems. Using the most innovative and up-to-date modelling techniques, we can optimise the pumping configuration for customers to provide a system design giving the maximum performance in the most reliable and cost-effective way.

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.

THE INTELLIGENT CHOICE

Edwards nXDS is a great new shape of dry vacuum pumping The nXDS has taken scroll vacuum technology to the next level. Improved performance, exceptional pumping capability, quiet operation, and extended service intervals make nXDS the ultimate dry choice.

Quiet operation
Better working environment

Hermetically sealed for a lubricant-free vacuum environment
Contamination-free process and no oil to dispose of

Low power consumption
Low cost of ownership

Intelligent and easy-to-use controls
Flexibility of operation

Superior vapor handling
A wider range of applications

Long service intervals
Maximized uptime

Edwards Applications

You can be assured Edwards has the application expertise and the vacuum pump or integrated system solution to meet your needs.

Mass spectrometry
• GCMS, LCMS, ICPMS, MALDI, RGA, surface science, leak detectors

Electron microscopy
• TEM, SEM, sample coaters

Sample preparation
• Gel dryers, glove boxes, rotary evaporators, centrifuges Research and development
• Chamber evacuation, coating systems, turbopump backing

High energy physics
• Beam lines, accelerators, mobile pump carts, turbopump backing, laser evacuation

Industrial
• Gas recovery and recirculation, glove boxes, brake line and air conditioning evacuation, coating systems, freeze drying, gas bottle filling/emptying, refrigeration system manufacture, degassing/curing (oil, epoxy resin)

Chemical
• Gel dryers, glove boxes, rotary evaporators, centrifuges, solvent recovery, distillation/extraction/ filtration.

Item		nXDS6i	nXDS10i	nXDS15i	nXDS20i
Nominal rotational speed	1800 rpm
Displacement	m3 h-1  (ft3 min-1)	6.8 (4.0)	12.7 (7.5)	17.1 (10.1)	28.0 (16.5)
Peak pumping speed	m3 h-1  (ft3 min-1)	6.2 (3.6)	11.4 (6.7)	15.1 (8.9)	22.0 (13.0)
Ultimate vacuum (total pressure)	mbar (Torr)	0.020 (0.015)	0.007  (0.005)	0.007  (0.005)	0.030  (0.022)
Minimum standby rotational speed	rpm	1200
Speed control resolution (percentage of full rotation speed)	%	1
Max inlet pressure for water vapour	mbar	35	35	35	20
Max water vapour pumping rate	gh-1	110	145	240	220
Maximum continuous inlet pressure	mbar	200	200	200	50
Voltage input	V	100-127, 200-240 (+/-10%)
Voltage frequency	Hz	50/60
Motor power 1-ph*	W	260	280	300	260
Power connector 1-ph	IEC EN60320 C13
Recommended fuse	10A, 250V a.c. rms
Weight	kg (lb)	26.2(58)	25.8 (57)	25.2 (56)	25.6 (56)
Inlet flange	NW25
Exhaust flange	NW25
Noise level**	dB(A)	52
Vibration at inlet flange	mms-1 (rms)	< 4.5
Leak tightness (static)	mbar ls-1	< 1×10-6
Operating temperature range	°C (°F)	+5 to +40 (+41 to +104)