Clarke 250TE Dokumentacja Pobierz pdf (Strona 4)

SAFETY PRECAUTIONS

1.0 Introduction

Read and understand these safe practices before attempting to install, operate, or

service the equipment. Comply with these procedures as applicable to the particular

equipment used and their instruction manuals, for personal safety and for the safety

of others. Failure to observe these safe practices may cause serious injury or death.

When safety becomes a habit, the equipment can be used with confidence.

2.0 General precautions

2-A Burn prevention

Wear protective clothing - gauntlet gloves designed for use in welding, hat, and protective

shoes. Button shirt collar and pocket flaps, and wear cuffless trousers to avoid entry of

sparks and slag. Wear helmet with safety goggles or glasses with side shields underneath,

appropriate filter lenses or plates (protected by clear cover glass). This is a MUST for

welding or cutting, (and chipping) to protect the eyes from radiant energy and flying

metal. Replace cover glass when broken, pitted, or spattered. Avoid oily greasy clothing.

A spark may ignite them. Hot metal such as electrode stubs and workpieces should

never be handled without gloves. First aid facilities and a qualified first aid person should

be available for each shift unless medical facilities are close by for immediate treatment

of flash burns of the eyes and skin burns. Ear plugs should be worn when working

overhead or in a confined space. A hard hat should be worn when others work overhead.

Flammable hair preparations should not be used by persons intending to weld or cut.

2-B Toxic fume prevention

Severe discomfort, illness or death can result from fumes, vapours, heat, or oxygen

enrichment or depletion that welding (or cutting) may produce. Prevent them with adequate

ventilation. NEVER ventilate with oxygen. Lead-, cadmium-, zinc-, mercury- and beryllium-

, bearing materials, when welded (or cut) may produce harmful concentrations of toxic

fumes. Adequate local exhaust ventilation must be used, or each person in the area as

well as the operator must wear an air- supplied respirator. For beryllium, both must be

used. Metals coated with or containing materials that emit toxic fumes should not be

heated unless coating is removed from the work surface, the area is well ventilated, or

the operator wears an air-supplied respirator. Work in a confined space only while it is

being ventilated and, if necessary, while wearing an air-supplied respirator. Vapours

from chlorinated solvents can be decomposed by the heat of the arc (or flame) to form

PHOSGENE, a highly toxic gas, and other lung and eye irritating products. The ultraviolet

(radiant) energy of the arc can also decompose trichloroethylene and perchlorethylene

vapours to form phosgene. DO NOT WELD or cut where solvent vapours can be drawn

into the welding or cutting atmosphere or where the radiant energy can penetrate to

atmospheres containing even minute amounts of trichloroethylene or perchlorethylene.

2.3Welding cables

The welding cables should be kept as short as possible and should be positioned

close together, running at or close to the floor level.

2.4Equi-potential bonding

Bonding of all metallic components in the welding installation and adjacent to it

should be considered. However, metallic components bonded to the work piece will

increase the risk that the operator could receive a shock by touching these metallic

components and the electrodes at the same time. The operator should be insulated

from all such bonded metallic components.

2.5 Earthing of the workpiece

Where the workpiece is not bonded to earth for electrical safety, nor connected to

earth because of its size and position, e.g. ships hull orn building steelwork, a

connection bonding the workpiece to earth may reduce emissions in some, but not

all instances. Care should be taken to prevent the earthing of the workpiece increasing

the risk of injury to users, or damage to other electrical equipment. Where necessary,

the connection of the workpiece to earth should be made by a direct

connection to the workpiece, but in some countries where direct connection is not

permitted, the bonding should be achieved by suitable capacitance, selected according

to national regulations.

2.6 Screening and shielding

Selective screening and shielding of other cables and equipment in the

surrounding area may alleviate problems of interference. Screening of

the entire welding installation may be considered for special applications.

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