Edwards XDS and nXDS Range of Dry Scroll Pumps For Marine
Edwards XDS and nXDS Range of Dry Scroll Pumps For Marine, clean vacuum solutions for a wide range of applications. Scroll pumps are an excellent alternative to rotary vane pumps where oil free pumping is desirable.
Edwards XDS dry Scroll Pumps
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:
- To the fire hose connections in the engine room, main deck, accommodation, shaft tunnel, steering gear room etc.
- To the anchor washing at forecastle.
- As driving water for the ejector fitted in the cargo hold bilges.
- As driving water for the ejector fitted in the dangerous cargo hold bilges.
- 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 2/3rd 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
- nXDS is our latest generation of scroll pump offering increased pumping speeds, combined with lower ultimate pressures, lower power consumption and lower noise levels than other pumps.
- nXDS pumps are designed to be completely field serviceable. Its intelligent control functions and up to five-year service interval offer low cost of ownership, making it the small dry pump of choice for today’s most advanced technologies.
EDWARDS THE PARTNER OF CHOICE
- Edwards is a world leader in the design, technology, and manufacture of vacuum pumps with over 95 years of history and more than 75 years of manufacturing experience.
- 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 modeling techniques, we can optimize the pumping configuration for customers to provide a system design giving the maximum performance in the most reliable and cost-effective way.
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.
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
- Beamlines, 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.
Technical Data
| 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) | |||
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Source : www.edwardsvacuum.com
