履带起重机操作手册

3.7.5 Measures adopted if a gas pipe is damaged and the gas escapes, or a leak is suspected

a) Stop work immediately.

b) Leave the crane after shutting down the engine and all additional fuel powered units c) Alert all site personnel, avoid producing any sparks and maintain a strict no-smoking policy. d) Switch off all construction equipments and shut down the engine near the construction equipments. e) Clear the dangerous area and secure a wide area with barriers. Do not allow access by unauthorized personnel. f) Inform the relevant gas company of the following:

- The extent of the damage

- The exact location of the site

- The circumstances of the accident

How long ago the accident occurred g) If there is the slightest suspicion that the gas is leaking into a building, alert the local occupants by knocking personally or calling loudly. Do not ring the door bell or call them by telephone, as this may trigger an explosion. h) In the event of major damage, evacuate the occupants of all the surrounding buildings with the cooperation of the police or fire department. i) Building site personnel:

- A name and telephone number for a return call.

If the odor of gas is present in the building, especially around the area where the gas pipe is known to enter the house; do not operate any electrical systems or equipment. Open all doors and windows widely for ventilation purposes and leave the building immediately.

Must assist all special personnel from the gas company during the repair work.

Can only leave the building site with the consent of the special personnel.

- Work on the building site can only begin again if authorization has been given by the relevant gas company.

3.7.6 Measures adopted in the event of a gas fire WARNING

(1) Extinguishing a gas fire requires specialist knowledge.

(2) A gas fire that has already been extinguished can flare up again if more gas escape and break out in an unexpected spot.

(3) Precautions in the event of a gas fire:

- Inform the local fire department of the fire.

Operator’s Manual for Crawler Crane

Operator’s Manual for Crawler Crane

- Do not attempt to put out the fire before the fire department arrives unless lives are in danger or there is a risk of major damage to property.

- If the gas fire is not causing any immediate danger, it is sometimes better to let the gas burn. As soon as the gas company shuts off the gas pipe, the fire will extinguish itself.

3.7.7 Notes in connection with underground electric cables

a) For excavation work, observe the minimum safe distance from the underground cable (at least 3’4” (1 m) b) Even minor damage to the outer casing of an underground cable should be reported to the relevant power station. If damp is allowed to penetrate, the cable could fail in the future. The location of such a fault is to be precisely measured to establish who or what caused the damage.

3.7.8 The consequences of damaging an underground cable

a) After it has penetrated the insulation, the machine can become charged with a dangerously high voltage.

b) If an underground cable is sheared, burn-out at the fault location with strong electrical arcing may occur.

c) If a high-voltage power cable becomes damaged, a hazardous resistance area may form around the fault location.

Warning

(1) The safety devices of the various national electricity networks react differently in the event of a fault. Therefore it cannot be taken for granted that there will be an automatic and lasting shut-down following damage to an underground cable.

(2) The machine and the damaged underground cable can therefore still be under hazardous voltage levels and form a resistance area, even if there are no discharge, smoke formation or cracking noises.

3.7.9 The measures taken when the machine damages an underground cable

a) First, remain calm – do not panic.

b) Do not leave the operator’s cab.

c) If the controls are still functioning:

1) Initiate travel in the opposite direction immediately and disconnect the underground cable.

2) Then drive the machine out of the danger area.

3) Only stop the machine once the distance from the fault location is – At least17ft (5 m ) in the case of a low-voltage cable (lower than 1000V),

Operator’s Manual for Crawler Crane