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  • Generator Info

    "Bigger is Better. You'll always need more power"

    When selecting a generator the following points should be considered:

    *Portable or Stand-by

    *Petrol or Diesel

    *Manual start or Automatic Mains Failure start system (AMF)

    *Regulated or non regulated. If you will be using computers, televisions or any appliance that needs a stable voltage then, the generator should have an AVR (Automatic voltage regulator) fitted. Industrial generators such as those used to run drills,grinders etc do not need to be regulated.

    *Connect to your existing wiring or install additional wiring

    *Run essential equipment or the whole house/premises

    *Noise- most of us don't live on a farm so think about your neighbours. Generators can be supplied as quiet units. Position can make a big difference.

    *Size-This is important as under powered generators will not do the job and will make you frustrated. Overloaded generators will breakdown and will be expensive to maintain. Too big and you will waste fuel and cause glazing of the cylinder bores. 

    *Is a maintenance contract available? This is essential as generators not properly maintained are certain to let you down. Generators stand idle for long periods and need regular checks.

    * Does the supplier have spares? Can he offer professional service? 

    We offer petrol and diesel powered units.

    You can specify what engine you would like to use-Petrol or Diesel

    Single phase and three phase alternators available. Regulated or unregulated.

    Welder/generator alternators.

    Portable or standby.

    Domestic or industrial.

    Automatic main failure board or manual switch over.

    Sound proofing or open type.

    Manual or electric start.

    Installations done by a qualified electrician.

    If you can't find the generator to match your specifications give us a call. We custom build generators and can offer a varietry of different types. Our range includes portable units up to 8 KVA and Stand-by units up to 1 MW. Let us know what size you need or what you want the generator to run and we will give you a quote. If you need help choosing the correct generator give us a call and speak one of our technicians who will give you advice on the type of generator you need and the size required.

    For assistance please email us your requirements or telephone and speak to one of our technicians.

    Call Martin Drewett on 079 192 7714 or 011 609 3033 or email sales@geminismallengineservices.co.za

  • Pressure Washer Info

                                                                         High Pressure Washer

                                                                       "Bigger is not always better"

    This is a piece of equipment where bigger is not always best. Be careful, a pressure cleaner can cause damage and can be very expensive if not used properly! My father has owned car washes for 30 years and can vouch for the dangers of putting this equipment into untrained hands. High pressure water is so powerful that it can be used for cutting metal. 

    Typical uses for a pressure cleaner is cleaning cars, earth moving equipment, house walls and driveways and machinery particularly engines. Pressure cleaners can be driven by petrol,diesel or electric motors. Hot or cold water systems are available. 

    There are two important criteria to consider 1. Pressure and 2.Volume.

    1.Pressure is important-100/150 bar is normally sufficient for most applications. Turn the pressure down if you are cleaning motor vehicles. Dont point the nozzle directly at engine seals. If you are using hot water use a lower pressure. 

    2. Volume can vary-No good using a garden hose when you need a fire engine. If you have big equipment or a large area to clean go for a higher volume.  

    Most pressure cleaners have the facility to add chemicals to the water to help with the cleaning. I personally feel that this is a waste as, I believe the cleaning chemicals would be better applied prior to using the pressure cleaner. Don't let any salesman try to convince you that cold water system will do the same job as a steam cleaning system. If you have a particularly oily or greasy job to clean then steam is the only way to go. 

    Steam cleaners are more expensive to run and will require regular maintenance. The water is heated by diesel and the water will need treatment chemicals to prevent the blocking of the boiler tubes due to scale build up. Hot water and cold water pressure cleaners should be switched  off it not in use, if left to idle for long periods the pump will generate heat and the cold water coming in as soon as you use the lance will crack the pistons.  

    If you would like assistance selecting the correct High Pressure Cleaner please email us your requirements or telephone and speak to one of our technicians.  

    Call 011 609 3033 or 079 192 7714 or email sales@geminismallengineservices.co.za

  • Pump Info

    PLEASE NOTE: The maximum (suction head) depth that a petrol or diesel water pump can lift (Suck) water is 2.5 metres at 1600 metres above sea level. If the water source depth is greater than this you will need to consider using an electric submersible pump and, if there is no power you will need to use a generator. We have many inquiries for diesel pumps from people who believe that it is possible for pumps to lift (suck) water from depths of up to 100 metres sadly, they have been misinformed. If anyone claims that their pump can lift (suck) water greater than 8 metres at sea level please contact us to confirm the specs. 

    Pumps can be used for a variety of applications but the most common use is for pumping water. Pumps can be driven by petrol, diesel or electric motors. There are many types of water pumps such as clean water pumps, trash pumps, submersible pumps and bore hole pumps. 

    When selecting a pump there are two important criteria that must be determined-Volume (Litres or cubic metres) to be pumped and head (height from the pump to the outlet) required. Generally, the greater the head the more power will be needed to pump the same amount of water. Most pump manufacturers have graphs which show volume vs head vs power required. 

    The suction head which is the distance from the water to the pump should be kept to a minimum. Try not to exceed 5M as it will cause the water to boil in the pump (Boyles Law). Priming  the pump can also be difficult. If the suction head is excessive consider using a submersible pump or move the pump closer to the water. 

    Always make sure that a strainer is fitted to the suction pipe inlet. If possible try to keep the suction pipe inlet raised off the bottom. 

    Types of pumps:

    Clean water pumps-These are usually made from plastic or aluminium. They cannot handle any solids and should not be used to pump dirty water as this will damage the pump. The pipe diameter can vary 2", 3" and 4" are the most common sizes The bigger the diameter the greater the volume of water to be pumped. These can be used for irrigation, emptying pools etc.

    Trash pumps- These are usually made from cast iron, steel or aluminium lined with steel. Used for pumping dirty water and they can handle solids such as sand and small stones. Typical uses are emptying trenches, mines etc.

    Submersible pumps- Can be made from a variety of materials. These pumps can be electrically driven or  a flexible drive unit. The electrically driven pumps will need a generator if there is no power source. Submersible pumps can handle very large heads but this will depend on the volume required and the power of the motor. Common uses are mines or irrigation. 

    If you would like assistance selecting the correct Pump please email us your requirements or telephone and speak to one of our technicians.  

    Call Martin Drewett on 079 192 7714 or email geminismallengineservices@gmail.com

  • Engine Info

    Quality industrial diesel engines and industrial petrol engines at the lowest prices! Industrial engines of all sizes available. Spare parts for most makes available. Engines shipped throughout South Africa and neighboring states daily.

    Selecting an engine to suit your application can be quite a difficult task as, there are so many makes and models to choose from. If your specifications are not correct you could end up with an engine that can't do the job.

    The basics criteria to determine your selection are:

    Petrol or diesel-Diesel engines are cheaper to run than petrol engines but are more expensive to maintain. Diesel engines are generally more expensive than petrol engines.

    HP or KW needed-This is critical as an under powered engine may not do the job an will need much more maintenance. An overpowered engine is a waste and will be far more expensive on fuel.

    Horizontal or vertical drive shaft- Most lawnmowers use a vertical shaft. Generators use a horizontal shaft.

    Type of shaft-Shafts come in a variety of types and are determined by the application. The most common types are parallel keyed, Taper, Internal threaded and External threaded. SAE or Metric.

    Direction of rotation-This is determined by your application. The normal direction is anti clockwise looking at the shaft.

    Output shaft speed/Clutch-Engines will allow you to set the speed as you require. However, there are applications where the speed is fixed such as generators and will require a speed regulator. Other applications like concrete mixers or conveyor belts may require a reduction gearbox 2:1 to slow down the shaft rpm. Clutches are used for applications such as Go Karts, Rammers and other construction equipment.

    Mounting- SAE or Metric flange.

    Additional points to consider are:

    Weight of engine.

    Size of engine.

    Starting method-Electric or recoil

    Fuel tank-Fitted to engine or external.

    Air filter-Standard or heavy duty.

    Exhaust-Standard or Low noise.

    If you would like assistance selecting the correct Generator please email us your requirements or telephone and speak to one of our technicians.

    Call Martin Drewett on 079 192 7714 or 011 609 3033 any time for expert advice or email geminismallengineservices@gmail.com with your query.

  • Pool Pump Info

    Pool Pump

    The best quality pool pumps at the lowest prices! .75 KW from R 1690.00 incl fully guaranteed. Pool pumps available in a range of sizes. Shipping throughout South Africa. We have included our more popular swimming pool pumps in our price list. However, if you cannot find the the pump you are looking for feel free to email or give us a call. Pumps are available for large pools such as hotels, schools and municipal baths.Trade inquiries welcome. 

    If you would like assistance selecting the correct pool pump or need over the telephone diagnostics please email us your problem or call and speak to one of our technicians. 

    Most pumps are repairable. Check with us first before replacing your pump. If the pump is not repairable we will show you why. Old age is no reason to replace your pump. All work carried out is fully guaranteed. We only use top quality bearings and mechanical seals. All replaced parts are kept for inspection. 

    Need help with fitting the new pump? Give us a call to book an on-site call out by one of our technicians. 

    Please note:

    1.Changing the pump may require re-configuring of the pump inlet and outlet pipes.

    2.If you have added solar panels and your pool cleaner is not performing as it should  consider upgrading the pump. If you have a .75 kw pump you should upgrade to a 1.1 kw. The greater the number of panels and the higher they are above the pump will determine the size of the pump required.

    3.Suction leaks are a common problem and if excessive will affect the operation of your pool pump. Leaking inlet pipes will cause air bubbles in the water which can be seen by looking through the pump leaf trap lid while the pump is running. Let the pool pump run for a while then check the pool outlet and look for bubbles. Check the suction pipe joins and make sure that the lid O-ring is sealing properly.Air leaks will affect the operation of your pool cleaner. If you suspect that you have an air leaks call in a professional to diagnose the problem.

    4.Leaking solar panels can cause air leaks this should not be confused with suction leaks. The water drops faster than the pump can deliver this causes a vacumn and the air will be sucked in at any leaks. Solar panel air leaks will cause air bubbles at the outlet pipe and can affect the suction side.Often the panels are noisy with the sound of rushing water. 

    5.Don't be fooled by claims of power consumption savings. The bigger the pump the more power that will be needed to run it. The basic laws of physics apply to all pumps.

    6. When you install a new pump remove the filter lid and stir the sand. Run the pump for a while with the lid off so that the dirt can be removed. It is a good idea to stir the sand while the pump is running. Be careful not to break the filter fingers at the bottom of the filter.

    7. It is not unusual to find leaks after you replace a tired old pump. A good place to check is the waste pipe as the multiport valve may leak when the valve is set in the filter position. If your pool is losing water this is a good place to check first. 

    8. Alot of older pools were fitted with oversized pumps which causes unnecessarily high electricity bills. Often we replace the pump with a smaller model to suit the pool size. There is no change in performance but you will notice the electricity savings.  

        

    For a free quote or diagnostics call Martin Drewett on 079 192 7714 or 011 609 3033

    email geminismallengineservices@gmail.com