Showing posts with label chainsaw safety. Show all posts
Showing posts with label chainsaw safety. Show all posts

Friday, 11 June 2010

A Guide to Chainsaw Protective Clothing and Equipment

Chainsaws are potentially one of the most dangerous tools in general use, the saw is made to cut easily through large branches and tree trunks so any part of the human body will have no resistance at all to the cutting power in use.

Therefore there are recognised standards for the PPE required to minimise the risks in the case of clothing these are the standards EN 381. These standards specify levels of protection related to the speed of the chain and also the amount of coverage of the protected areas.

Class 0 resists chains up to the speed of 16 metres per second
Class 1 resists chains up to the speed of 20 metres per second
Class 2 resists chains up to the speed of 24 metres per second
Class 3 resists chains up to the speed of 28 metres per second
Class 4 resists chains up to the speed of 34 metres per second

There are also different parts to the standards each of which covers a specific part of the body:

EN 381-5 Leg protection
This is split into 3 different levels A, B and C and the minimum requirement is Class 1
A protects the front and ride side rear to both legs
B gives additional protection to rear left side of the right leg
C gives all round protection to both legs

EN 381-7 Chainsaw Gloves
This is split into 2 Different Levels A and B
A gives protection to the left hand
B gives protection to both hands

EN 381-9 Chainsaw protective Gaiters
These are recommended for occasional chainsaw users when working on even ground with little risk of tripping or snagging, worn in combination with steel toecap safety boots

EN381-11 Upper part of Body
These garments are normally Class 0 as to achieve higher levels would involve so many layers of material that the garment will be too heavy and unwieldy, leading to lack of mobility and the increased risk of heat exhaustion, both of these will have a negative impact on Safety.

There is a separate standard for Footwear EN 17249:2004
These items cannot be Class 0, they can be Class 1, Class 2 or Class 3 and are the only items that can achieve Class 4 status.
They must be marked with the Year and Quarter of manufacture.

How does chainsaw protection work?

There is no flexible material that can be worn as clothing, gloves or boots that can be totally impervious to cuts from chainsaw blades. Therefore a number of layers of protection are the only way forward.

The outer layer normally comprises of a material that is tough and slippery, this is mainly to ensure that outer surface is resistant to minor damage from thorns and other snagging mediums, which could expose the under protective layers. Beneath this, long, loose fibres of ballistic nylon or Kevlar are layered. When a saw contacts the trousers, the outer layer is immediately cut and the nylon or Kevlar is drawn out and wraps around the saw's drive sprocket, locking it solid and halting the chain, thereby limiting damage to the operator's limb.

Once the item has been cut it must be scrapped as the protection has been totally compromised. The saw must be stripped down and the fibres fully removed before using it again.

Marking

All Chainsaw protective clothing, boots and gloves sold in the EU must carry a pictogram depicting a chainsaw and information of the Class and Design it is rated to, this pictogram must be a minimum of 30mm x 30mm. For example:

Other items that must be used when using a chainsaw are:
Safety Helmet to the minimum standard EN 397 but recommended to EN 12492 if involved in tree climbing operations.
Hearing Protection to EN 352-1 (noise levels are typically 115 dB)
Eye Protection Mesh Visor to EN 1731
Safety Glasses to EN 166
As these are used for protection in other activities not just for chainsaw work they do not have to be marked with the pictogram.

Granite Workwear has always kept up to date with the latest developments in Chainsaw Protective Clothing and Equipment and indeed have a specialist Forestry section on the web site which is subdivided into Clothing, Footwear and Tools and Accessories. New items are added on a regular basis as they become available, we are very happy to answer any questions you may have on what is the best solution for your particular needs.

Wednesday, 11 November 2009

Using a rear handled chainsaw

The use of petrol driven chainsaws can be very dangerous if the operator is not trained and practised in its use. We have put together some information on using a chainsaw to help people to understand how one should be handled and some of the regulations that have to be followed.

Firstly there are two types of chainsaw, rear handled and top handled. Top handled chainsaws can only be used when working off the ground i.e. climbing or working on a mobile elevating platform. We will be presenting information on the use of the top handled chainsaw in a later article.

So the use of rear handled chainsaws is for groundwork i.e. felling, clearing of windblow, snedding (removal of small branches from a felled tree) and sectioning of trunks and large branches.

All chainsaw users must be aware of the weather conditions that they are working in and also the dangers of being cut by a saw, hit by falling timber, vibration and noise.

Therefore the first area we will look at is the Personal Protective Equipment (PPE) that is required. It should be understood that no PPE can actually protect you 100% against cuts and therefore it is important to remember this and not just rely on the protection but ensure that you are minimising any risk by the application of common-sense and good practice learned during training and from experience.

Items of Equipment:

Leg Protection: The trousers or leggings should incorporate chain clogging material complying with EN 381-5 Class1 you will find these on the Granite Workwear site under Forestry Clothing, we stock a number of items from the SIP range including Hi Vis in both Orange to GO/RT 3279 for use on or near railways and also Yellow, both colours comply with EN 471 class 2.

Outer clothing: These items should be non-snag and in certain cases Hi Vis, the jackets may or may not have cut protection, although that is advisable.

Safety Helmet: this must comply with EN 397 these can be found under Forestry Tools & Accessories.

Eye Protection: this can be either a mesh visor complying with EN 1731 or safety glasses complying with EN 166.

Hearing Protection: This protection must comply with EN 352; the best way is to use helmet mounted ear defenders for example the Sordin or Peltor products found on the Granite Workwear site.

Gloves: The type of glove required will be dependent on the Risk Assessment and the type of machine being used. Areas to be considered are; protection from cuts from the chainsaw or thorny material cold or wet conditions as well as vibration. For protection against chainsaw cuts the gloves should comply with EN 381-7, for example the Timberland Protimber L available on the Granite Workwear site.

Protective Boots: These must have a good grip sole and also protection in the front vamp and instep complying with EN 20345. We recommend the Haix range to be found under Forestry Footwear on the site.

First Aid Kit: Each person must have a first aid kit on them to include a large wound dressing; we also recommend carrying a pouch of Celox which is a haemostatic granule which when poured into a bleeding wound, links to the red blood cells promoting rapid coagulation.

Machine Checks

The machine should be checked for the following before use:
  • The stop switch is clearly marked and works.
  • The front hand guard, chain brake, chain catcher and anti-vibration mounts are all undamaged and working.
  • The throttle opens only when the throttle lock is depressed.
  • The saw is fitted with a chain type recommended by the manufacturer and is designed to reduce kickback.
  • The exhaust system and silencer are in a good state of repair.
  • The saw displays the mandatory hearing protection symbol.
  • The equipment is available for sharpening, maintenance and adjustments and a chain cover for use during transportation.
Preparing for work

Operators should not work alone, a risk assessment has been carried out and any significant points are recorded. All personnel involved in the worksite are aware of and comply with the controls in place.

Ensure that a safe method of work has been agreed including a 5 metre distance is maintained between workers and any ancillary equipment.

Ensure that everybody understands the information needed to contact the Emergency Services including directions to the site and access information. Also ensure that the appropriate signage is in place to warn that this is a hazardous worksite.

Ensure that fuel is stored in appropriate containers with non-spill spouts and that it is stored away from direct sunlight and any possible source of ignition. Do not start the chainsaw within 4 metres of the refuelling point.

Starting the Saw

Make sure you are a safe distance from other people and that the saw is clear of obstructions.

When starting from cold, put the saw on the ground and set the controls following the manufacturer’s recommendations.

Place one foot on the rear handle and your left hand on the front handle, then pull the starter cord firmly.

From hot the safest way is using a ground start but without using the choke or the half throttle stop controls, however you can use a thigh or knee start; grip the rear handle firmly between the knees grip the front handle with your left hand and then pull the starter cord firmly.

Using the Saw

The saw must be used with the right hand on the rear handle; the thumb of the left hand must be under the front handle.

Check that the chain brake works correctly, use the chain brake when walking on the site or if the saw is not being used for more than 15 seconds. The brake should be applied with the back of the left wrist.

Stop the saw if it is not in use for longer periods.

Be wary of kickback, this is where there is uncontrolled upward and or backward motion of the guide bar. It is usually caused when the nose of the guide bar comes in contact with a log or branch, when the wood being cut pinches the saw chain while cutting, or when the chain catches a piece of metal that may have been ‘buried’ in the wood such as a nail.