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History of Water Jet

Using water as a cutting technique for soft materials has been around for many years, however early forms like the paper metering system by the Paper Patents Company within the Nineteen Thirties used comparativelyunaggressive water. high waterjet technology really took type within the post-war era, leading to quicker cutting and larger exactness. responsibility remained a challenge, though, till the first Nineteen Seventies once Dr. John Olsen, VP of Operations at OMAX Corporation, developed the primary reliable ultra-high pressure pump.

While early waterjets might simply cut soft materials, they weren't effective in cutting tougher materials like metals. This capability was achieved by adding associate abrasive to the waterjet within the cutting nozzle once the airstream was fashioned, supported a way that had been pioneered by Elmo Smith and Leslie Tirrell within theNineteen Thirties within the field of liquid ablative blasting. Early abrasive waterjet nozzle life was too short to be commercially viable, however material innovations in commixture tubes by Boride Corporation eventually resulted in a very commercially acceptable nozzle. With the mix of a sturdy abrasive waterjet nozzle and a reliable high pump, associate abrasive waterjet machine might currently cut a large vary of materials, together with hardened alloy steel, titanium, stone and glass.

                                           

Jet Pump

1991

HS Series waterjets, for 50-65 knot craft, is introduced. These were multi-stage waterjet units designed for high-speed light commercial craft with power inputs up to 1,600kW.

1993-98

New jet models introduced to fill holes in Hamilton’s waterjet range – HJ241, HJ321, HM461.
Existing models further developed with more efficient intake and screen designs, 0 and 5 degree intake block options, and improved anti-fouling/anti-corrosion protection.
Largest Hamilton Jet model waterjets developed – HM651, HM721, HM811.

1994

Turbo impeller developed along with HJ212 model to replace the multi-stage 773 unit in trailerable boats. The Turbo impeller improves jet performance in aerated water conditions.

1996

Control Monitoring Unit (CMU) developed as a fully electronic jet and engine control system for larger waterjets.

1998

JT Steering system introduced. Nozzle design minimises thrust loss when steering to improve steering control and course-keeping efficiency.

2000

MECS (Modular Electronic Contrl System) supersedes CMU for electronic control.2003

HJ403 waterjet unit superceeds HJ391 in model range. New model features improved design for greater efficiency, ease of installation and lower maintenance, as well as a new ahead/astern control systems.
Dynamic Positioning interface for MECS developed. This allows MECS to interface with a ship’s DP system to improve station-holding ability and general safety around oil-rigs.

2004

VoyageData Recorder interface for MECS developed. Sends waterjet control history to a vessels VDR (similar to an aircraft’s “black box”) for future reference in the event of an accident. Primarily used on fast passenger ferries.

2005

Introduction of the blueARROW control system sees a new era in waterjet control. More compact and reliable, and easier to install and maintain, than MECS, blueARROW brings electronic controls to smaller waterjet models HJ292, HJ322,HJ364 and HJ403.

2006

Enter the MouseBoat – the first installment of next generation waterjet control devices from HamiltonJet. Incredibly intuitive and simple to use, the MouseBoat ensure anyone can harness the full manoeuvring capabilities of waterjets.

2008

The first HT1000 waterjets are manufactured, increasing HamiltonJet’s size range above the HM811.

2012

HT810 and HT900 Range successfully launched to include HT810 and HT900.

2014

HamiltonJet celebrates 75th year Anniversary

2015

In December 2015 HamiltonJet launched their new JETanchor Positioning System at the International Workboat Show in New Orleans. This is a ‘light’ dynamic positioning system design for small to medium sized workboats not requiring class certification.

The Basics of a Water Jet Pump

There square measure 2 kinds of pumps used these days in waterjet cutting: the linear intensive pump and therefore the rotary direct drive pump.

Today, each intensive and direct drive pumps square measure capable of dependably delivering ultrahigh-pressure water, and each square measure with success utilized in trade. the 2 pumps have sure parts in common. They each have a motor, water filters, system, and sensors, among different similarities.
Before we tend to begin viewing these 2 pumps one by one, let’s take a glance at however the trade defines variations in pressure levels. Please note that pressure ranges follow typical air mass plumbing runs (water delivery lines, T’s, elbows, etc.).

• Low pressure is anything under 10,000 psi (69 MPa).
• Medium pressure is between 10,000 and 15,000 psi (69 to 103 MPa).
• High pressure is between 15,000 to 40,000 psi (103 to 276 MPa).
• Ultrahigh-pressure is between 40,000 psi to 75,000 psi (276 to 517 MPa), for waterjet cutting most pumps are between 55-60,000 psi (379 to 413 MPa).
• HyperPressure^TM is anything above 75,000 psi (above 517 MPa).

Linear Intensifier Pump

The linear intensifier pump is the original, and most common, technology used in waterjet cutting. Intensifier pumps use the elegant “intensification principle” to pressurize the water. Let’s take a look at how this theory works.

Hydraulic oil is pressurized to a pressure of 3,000 psi (in this example). The low pressure oil pushes against a piston biscuit, which has a face area 20 times greater than the face of the high pressure plunger that pushes against the water. Therefore, the 3,000 psi oil pressure is “intensified” twenty times, yielding 60,000 psi water pressure. The “intensification principle”, or ratio, uses the difference in biscuit/plunger area to intensify, or increase the pressure.

The major components of a linear intensifier pump complete system are as follows:

• An electric motor between 25 to 200 hp (18 to 150 kW). The most common is 50hp (37 kW) for waterjet cutting applications.
• A hydraulic pump attached to the motor, which sends the hydraulic oil to the intensifier.
• An intensifier, which uses the intensification principle (explained above) to transfer the power of the oil to the water.
• An inlet water treatment to prepare the ordinary tap water for the pump.
• A control system to control the pump start/stop, water pressure output, and monitor pump integrity via sensors.   

                                  

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Rotary Direct Drive Pump

The rotary direct drive vogue pump was 1st utilized in field applications of paint removal, mining, and industrial cleanup. Direct drive pumps area unit used on concerning two hundredth of waterjet systems put in worldwide. This pump technology is additionally used for each industrial plant cutting and field cleanup applications these days. not like intensive primarily based pumps, the direct drive rotary pump has no pump. generally known as a treble pump, the electrical motor rotates a crank with 3 pistons to get the ultrahigh-pressure water.

If you're acquainted in any respect with a pressure washer accustomed clean change of state gum off sidewalks or wash down a house before painting, then take into account this to be constant form of pump. Direct drive rotary pumps aren't however offered at HyperPressure levels – they reach at ultrahigh-pressure (up to sixty,000 psi).

The major components of a rotary direct drive pump complete system are as follows:

• An electric motor between 25 to 500 hp (18 to 370 kW). The most common is 30 hp (22.4kW) for waterjet cutting applications.
• A power unit that includes a crank case (often with a gear box) and triplex ultrahigh-pressure fluid end.
• An inlet water treatment to prepare the ordinary tap water for the pump.
• A control system to control the pump start/stop, water pressure output, and monitor pump integrity via sensors.

Pump comparison

A true comparison should be left to the experts who sit down with you and review your application. I will just provide a few general high-level opinions.

• Intensifier pumps are available that can deliver higher pressure than direct drive pumps.
• Direct drive is more electrically efficient.
• Intensifiers have longer maintenance intervals.
• Direct drives are smaller in size.
• Intensifiers are better suited for applications where the cutting head will have a lot of on/off cycles.
• The bottom line is every of those 2 pump technologies has execs and cons. A pump call can not be created by reading this post. Instead, the aim of this post is to induce you grounded within the basics of those pump technologies. once you square measure able to look into adding a waterjet, it's best to debate your explicit wants with Associate in Nursing skilled World Health Organization has application expertise with each styles of pump technologies. that's however you may notice the proper appropriate your application and work. within the finish I actually have found that the applying dictates the pump, and ultimately your pump call are clear to you.

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