Archive for August, 2009

The water is not as hot as it used to be – Why

Wednesday, August 26th, 2009

The fuel nozzle in your hot water pressure washer is a wearing item. It needs to be changed regularly. When you change it depends entirely on the quality of fuel passing through it. As the nozzle wears the droplets which are atomised become bigger until they will no longer ignite easily. The symptom of this is flames appearing up the chimney. As soon as the flames are visible half way up the square section, change your nozzle and your filter, as well as removing the fuel tank and draining out the sediment and water that will have accumulated.

Another reason for the water not getting as hot it used to, is a damaged cone. If you strip a fuel nozzle you will find that there are three very small grooves that the fuel travels along before it leaves the nozzle.

Dirt can block one of these grooves which forces most of the fuel out of one side causing a lopsided flame, which will in time oxidise the metal causing it to flake and drop into the bottom of the coil. The flame will burn mostly on one side of the boiler and even heating of the coil will not occur leading to a loss of heat output. Other symptoms include a hot outer casing and a partially melted fuel tank.

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DemoClean Graffiti Remover Gel

Friday, August 21st, 2009

DemoClean Graffiti Remover Gel is an effective graffiti removing gel which is not classified hazardous under CHIP regulations.

Graffiti Remover Gel will remove aerosol paint, felt tip marker and a variety of paint and ink.

Graffiti Remover Gel is effective on most types of surface including brick and masonry etc. Always check a small area for compatibility.

Benefits:

  • Non Hazardous under CHIP regulations
  • Low odour for operator comfort and safety
  • Low rate of evaporation leading to low product loss
  • Non chlorinated giving a safe, environmentally responsible product
  • High flash point for safety
  • Easy to use gel leading to minimal run off and waste
  • Excellent rinsability with water

 Application:

Graffiti remover Gel is designed to be used undiluted.

Smooth Surfaces

Apply the gel over the graffiti. Allow it to dwell for 5-25 minutes then agitate the surface with a brush or clean dry cloth. Wipe off the gel with a clean, dry cloth, turning the cloth frequently to ensure the graffiti is not returned to the surface.

Wipe off any residue with a clean damp cloth, and then rinse the surface. For best results, rinse with a mild alkaline cleaner.

Masonry/Brick:

Apply the gel over the graffiti using a brush or roller and allow to dwell for up to 60 minutes. Remove by using either a Demon Hot or Cold water Pressure Washer. Using Armex soluble blast media through the ‘EMIS’ system will dramatically improve results on stubborn areas and increase efficiency.

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I can’t get the pressure to where it used to be – where do I start?

Wednesday, August 19th, 2009

Firstly, check the nozzle – assuming that is correct and you still have no or low pressure the golden rule is to connect the pump to the mains water supply – whichever machine you are testing start with a good mains feed.

1. With the gun and lance connected turn the tap on – can you see a leak? If so there is your problem, if water can leak out air can get in and the pump won’t produce pressure – simple as that. (Leaks from underneath the pump are either worn seals or a cracked piston – strip to find out which.)

Remedy: Fix leak or replace seals or piston.

2. Check enough flow of water can get into the pump. Make sure all the filters are clean. The new Tempest hot water machines have a  fine filter which will remove most solids. All Demon machines are now double filtered. Have you checked both of them?

Remedy: Strip and inspect filters.

3. There are no leak’s what next? With the pump switched off pull the trigger, water will spray out. Keeping the trigger pulled switch the pump on, if the water spray does not improve the valves are the fault. Either worn out or dirty. Strip and inspect. (The high pressure hose will also vibrate on the ground.)

Remedy: Replace or clean valves.

4. The valves are OK there are no leaks but it still won’t get up to pressure – what next? The unloader valve piston and seat are damaged or worn allowing some of the water to circulate around the cylinder head – strip and inspect, you will see any damage.

Remedy: Strip unloader and inspect – replace damaged parts.

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Soda Blasting

Tuesday, August 18th, 2009

Soda blasting seems to be very popular at the moment – there are alot of people who are looking to setting up businesses in this field and we are happy to provide you with help and knowledge on applications.

Sodablasting is a process where sodium bicarbonate is applied against a surface using compressed air.

Sodablasting is a non-destructive method for many applications in cleaning, paint stripping, automotive restoration, industrial equipment maintenance, rust removal, graffiti removal, masonry cleaning and restoration, boat hull cleaning, food processing facilities and equipment.

See soda blasting in action on our website

Feel free to post your questions on here and we will come back to you.

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Welcome

Tuesday, August 4th, 2009

Welcome to Demon International’s first blog. We will be updating and adding over the next few weeks giving everyone a chance to discuss any aspect of the Demon range they may have.

There will also be section dedicated specifically to Soda Blasting – we hope that people will share their experiences with us as we have noticed a huge interest in soda blasting this year.

Finally any discussions on graffiti removal – techniques and products.

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