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Goodwin Submersible Slurry Pumps are designed and precision engineered to endure and perform in the most demanding environments. The heavy duty pumps are equipped with a patented external inducer that breaks down and re-suspends settled or compacted solids, allowing them to easily transfer a very high percentage of solids to water.
Goodwin have designed and manufactured Submersible Slurry Pumps for over thirty years. The original design brief included a formidable list of criteria: • A motor enclosure which eliminated electrical motor heating and burnout. • A motor with reserves of power to enable direct online starting when in settled sump solids. • Design an integral inducer to break down and re-suspend settled solids. • Develop a mechanical sealing system which was not subjected to the pumped media pressure. • Create a cable gland entry and motor configuration which kept the terminal enclosure separate from the motor enclosure. Originally used in UK coal mining, this was soon followed by the steel and power industries. During the 1990s a major design review took place before expanding into Europe and beyond, with applications in Gold, Copper and Platinum mining. Goodwin Pumps are now sold on four continents with centres of excellence for sales and service in Europe, India, China, Brazil, South Africa and Australia.
Suitable for submergence depth up to 28 metres. The Goodwin mechanical seal is only subjected to the pressure from the submergence depth of the pump which generally is only a few metres of head and not the discharge pressure of the product as competitor pumps predominantly are. This greatly reduces the chance of fluid ingress into the motor itself and the destructive consequences which can result. The seal is positioned directly below the lower bearing to give it maximum support and protection from vibration.
This feature assists the breakdown of large particles in the impeller that might ultimately lead to a blocked pump. There is little if any chance of the impeller becoming blocked as opposed to closed vane impellers which are often blocked and tend to stay blocked.
For very abrasive applications Goodwin can offer tungsten carbide coated impellers, inducers and wear plates as it is possible to coat 100% of the surface exposed to the slurry and thus provide the customer with excellent component life. Competitors closed vane designs have hidden surfaces which can’t be tungsten carbide coated.
The 150 and 200mm Goodwin Pumps are supplied with a removable discharge elbow, which is rubber lined for improved abrasion resistance. The patented Goodwin Inducer sends hydrodynamic shock waves below the pump which makes settled solids start to flow.
Goodwin heavy duty pumps are equipped with outstanding features that guarantee advanced performance over less durable pumps, with pioneering construction that allows for total operation in fully, part or non-submerged conditions. Goodwin use a ‘Twin Volute’ casing which puts a balanced load on the shaft which leads to much longer mechanical seal and bearing life as standard. Competitors ‘Single Volute’ casing puts an uneven load on the Shaft, which often leads to premature mechanical seal and bearing failure.
The cable has a double layer of waterproof insulation which is armoured with galvanised steel strands between the two layers of waterproof rubber and as such is much more resistant against damage. The IP68 rated cable gland seals against both the inner and outer sheaths, so even if the cable is damaged it is almost impossible for water to ingress to the electrical connections.
The Goodwin pump uses high quality copper end plates and bars in their rotor that are brazed together where the melting point of the braze is 787°C. Goodwin chose this over aluminium end rings and bars as aluminium has a lower melting point of 507°C and is susceptible to porosity if die-cast leading to premature rotor failure under severe conditions.
The Goodwin pump motor runs in a submerged oil bath that lubricates and cools the bearings and the mechanical seal. Additionally it transmits heat from the hottest part of the motor to the high mass stator housing that acts as a heat sink, eliminating motor hot spots which can give premature motor failure as would be the case if it was not oil filled.
The Goodwin pump benefits from forced convection cooling by nature of the pumped fluid passing around the motor housing before it leaves the pump. This allows the pump to run for extended periods of time even if it is run dry in fresh air (when other pumps would overheat and burn out) or even if it is only semi-submerged without over heating. This is an integral part of the design and makes the option of additional motor cooling a redundant expense.
To balance the load on the pump shaft, bearings and mechanical seal, Goodwin use a twin volute casing, reducing vibration and extending the life of all component parts especially the mechanical seal.
To reduce the bending moment on the shaft, when it comes into contact with large particles, the Goodwin inducer is kept as close as possible to the lower bearing.
Generously oversized to give extended life when pumping high specific gravity slurries.
Friction Head - Friction losses occur when pumping slurry through the discharge line, valves and fittings. This is known as ‘Friction Head’, and needs to be converted from equivalent length of pipe to pumped head (in metres). Total Dynamic Head (TDH) - This is the ‘Static Head’ added to the ‘Friction Head’ then converted into metres.
Pipeline Critical Velocity - The velocity of flow in the pipeline must be kept above a certain minimum value to prevent solids from settling out and blocking the pipe. This velocity can vary between different types of slurry, depending on the Specific Gravity (Sg) of the slurry being pumped. It is also important to remember that whilst it is essential to maintain a minimum velocity, having a velocity that is too high will also create problems such as high friction losses and increased wear on the piping system. Static Head - This is the vertical height from the surface of the slurry to the point of discharge.
The dark grey shaded area is the advised minimum flow to maintain a pipeline velocity 2m/s Pipe must be horizontal for this approximation to work Example: If distance ‘X’ is 400mm and the discharge pipe used is Ø100mm, then the flow from the pump will be approximately 91m³/h.
The wet end of the standard pump is made of Type 4 Ni-Hard (ASTM A352 Class 1 Type D) for its high hardness giving excellent wear life in almost all slurry applications. For extreme applications, we manufacture a Tungsten Carbide coated variant of this to give extended wear life in Iron Ore, Sand and other abrasive applications.
Fasteners - All fasteners fitted to Goodwin Pumps are supplied in 316 grade Stainless Steel for ease of maintenance.
Always ensure that the pump is correctly connected and protected by using the Goodwin Fully Automatic Control System which has Earth Fault Leakage Protection. The pump should be inspected as per the recommendations in the operating and maintenance manual.
To ensure that you get the best performance from your Goodwin Submersible Slurry Pump, we recommend that you follow the best practice procedures laid out on these pages. • Correct sump size - The minimum sump sizes need to be adhered to in order to obtain maximum life from the pump parts and to prevent pipeline blockages. Sump sizes are calculated based on, and are relative to:- pump size, inflow, outflow, sump working capacity and a maximum of 20 pump Stop/Starts permitted in 1 hour.
The minimum sump sizes on page 2 are based on pump size and minimum outflow to ensure 2m/Sec velocity in the discharge pipe and pumping cycles repeated every 10 mins.
Maintain minimum flow to ensure even distribution of solids and prevent pipe from blocking Free Board Dead Zone • A good water to slurry ratio • Sump level control - If the sump empties, the pump should switch itself off via the automatic control panel. The pump will switch on via a float switch or timer when the level rises. • Pump should not exceed 20 starts per hour. • The pump should be suspended by chains at least 200mm from base of the sump to ensure maximum concentration of solids pumped.
When pumping heavy slurries, always suspend the pump with the certified lifting equipment 200mm minimum above the bottom of the sump. Do not let the pump sit on the bottom of the sump.
When moving or suspending the pump, always use certified lifting equipment. Never lift or suspend the pump using the power cable.
Always use heavy duty flexible hose on the pump discharge. The flexibility of the hose will allow the pump to move on start-up. Do not connect the pump directly to a rigid pipe.
Make sure that the cable cannot be damaged by the rotating shaft by not allowing too much cable to be released into the slurry.
For the best operation of the pump and inducer, ensure that the pump is suspended in a vertical position.
A small sump will lead to excessive wear and blocked pipes. This is because the pump will quickly evacuate the slurry from the sump until it is snoring (sucking in air with the slurry).
As soon as it starts to snore, the flow in the pipe stops as the velocity reduces to zero. With no velocity in the pipe, all the heavy slurry particles settle out and fall back down the pipe, to the pump’s impeller. If the pump is not switched off this leads to rapidly exaggerated wear, grinding the particles rather than pumping them.
If a small sump is continually filling with slurry, there would be a need to exceed the maximum number of starts per hour or to leave the pump running on snore - neither of which are recommended, as by starting too frequently the motor will burn out, and by leaving the pump running, the ‘Wet-End’ will wear out very quickly as it is grinding and not pumping.
The Goodwin DWHH pump benefits from many of the Submersible Slurry Pumps unique advantages, making it one of the most versatile pumps in the world. These featured include Forced Convection Cooling, Oil Filled Motor (all Brass & Copper), Non-pressurised Mechanical Seal, Twin Volute Casing, Over-sized Bearings, Extreme Heavy Duty Cable, Product Temperatures up to 90°C, Dry Running Capability for extended periods of time Many typical uses for the Goodwin DWHH pump include; • High wall pumping (open pit) applications • Construction of Buildings, Dams & Harbour walls • Long distance pumping applications (up to 4 km) • Agriculture - Irrigation / Centre Pivots, Dam Feeding • Underground Mining (Non-Explosive applications) - Shaft bottom to first level • Flood level control - Industrial, Municipal, Mining & Marine • Emergency and Environmental control
• Max solid content - 5% • Max specific gravity kg/l - 1.1 • Max particle size - 10mm • Max slurry temperature - 90°C • Max flow m3/hr - 215 • Max head - 130m • Max pressure - 13 bars • Max submergence depth - 28m • Minimum sump size* - L 2.5m x W 2m x D 2.5m • Sump Dead Zone* (Bottom) - 0.42m
The Goodwin fully automatic control panel has four main modes of operation: 1 Manual mode The operator can Start and Stop the pump as required. 2 Automatic with Float switch start When the high level float switch is activated, the pump will start. When the low current relay senses the drop in power, the pump will stop. 3 Automatic with Timer start When the “Start Timer” is energised (user defined time), the pump will start. When the low current relay senses the drop in power, the pump will stop. 4 Automatic with Float switch & Timer start In this mode, both the high level float switch and the start timer are used. This means that at a pre-determined time the pump will start, but if the slurry level becomes high before this time, the pump will start. When the low current relay senses the drop in power, the pump will stop. All Goodwin control panels protect against; • Earth leakage faults - damage to the cable or pump • Current overload - of the pump • Phase imbalance - voltage variation of the incoming supply phases • Phase rotation - to ensure the pump runs in the correct direction • Phase loss - the loss of one or more of the incoming phases • Under voltage - if the incoming voltage is too low • Over Voltage - if the incoming voltage is too high
The benefits of using a Goodwin fully automatic control panel: • The panel can operate in “Manual” mode, where the operator can Start and Stop the pump as required. • When used in “Automatic” mode, it extends the life of the pumps wearing parts, as it will not be left running on snore (running but not pumping) for extended periods of time. The Goodwin panel does this by using an electronic low current relay, which detects when the pump is running on a light load (i.e. Snore). • Before starting, a Xenon beacon flashes and an audible (100Db) alarm sounds to warn operatives. • The panel is fitted with a lockable isolator” for safe maintenance. • The panel has the facility to be connected to a “Remote” Start / Stop station, including an Emergency Stop. • The 90kW & 112kW panels can be supplied for either “Direct-On-Line” starting, or with “Soft Start”. All 30kW panels are designed for “Direct-On-Line” starting. • All panels are IP65 rated as standard, and are suitable for both indoor and outdoor use. • All panels are fitted with rear mounting brackets as standard. Optional accessories for your Goodwin fully automatic control panel • Control panel stand • Control panel hood
To assist our customers, Goodwin have developed a ‘Wet-End’ spares kit which includes all of the necessary items your technicians will need to perform essential periodic maintenance on your Goodwin pump, to ensure reliable operation and the long life of your investment. The spares kit includes an Impeller, Wear Plate, Inducer, Shaft Sleeve, Lock Nut, Spacers, Fasteners - plus all of the tools and lubricants needed to perform the task and a step-by-step guide. For the 100mm range of pumps, Goodwin can offer its bespoke modular pump pontoon and winch system. This allows the user to easily manoeuvre their pump to where it is needed, without the ongoing expense of hiring a crane. The pontoon is supplied in “kit” form for ease of transportation, and can be fully assembled in just a few hours.
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