Permit to Work ( P T W)

Permit to Work ( P T W)

Permit to Work (PTW) refers to management systems used to ensure that work is done safely and efficiently. These are used in hazardous industries and involve procedures to request, review, authorize, document and most importantly, de-conflict tasks to be carried out by front line workers. Permit to work is an essential part of control of work (COW), the integrated management of business critical maintenance processes. Control of work is made up of permit to work, hazard identification and risk assessment (RA), and isolation management.

Permit to work is a core element of integrated safe system of work (ISSOW) systems, that along with risk assessment and isolation planning enable, As low as reasonably practicable (ALARP) reduction of unsafe activities in non-trivial work environments. Permit to work adherence is essential in process safety management.

A permit to work form typically contains these items.

The work to be done, the equipment to be used and personnel involved

1. Precautions to be taken when performing the task
2. Other workgroups to be informed of work being performed in their area
3. Authorisation for work to commence
4. Duration that the permit is valid
5. Method to extend the permit for an additional period
6. Witness mechanism that all work has been complete and the worksite restored to a clean, safe condition
7. Actions to be taken in an emergency

General Work Permit

General Work Permit is required for all the job.

HOT WORK PERMIT

Hot work permits are used when heat or sparks are generated by work such as welding, burning, cutting, drilling, and where work involves the use of pneumatic hammers and chippers, non-explosion proof electrical equipment (lights, tools, heaters), and internal combustion engines. Three types of hazardous situations need to be considered when performing hot work:

The presence of flammable materials in the equipment.

The presence of combustible materials that burn or give off flammable vapors when heated.

The presence of flammable gas in the atmosphere, or gas entering from an adjacent area, such as sewers that have not been properly protected.

COLD WORK PERMIT

Cold work permits are used in hazardous maintenance work that does not involve “hot work”. Cold work permits are issued when there is no reasonable source of ignition, and when all contact with harmful substances has been eliminated or appropriate precautions taken.

CONFINED SPACE ENTRY PERMIT

Confined space entry permits are used when entering any confined space such as a tank, vessel, tower, pit or sewer. The permit should be used in conjunction with a Code of Practice that describes procedures to follow.

SPECIAL PERMITS

Some employers use special permits to cover specific hazards such as:

Extremely hazardous conditions

Radioactive materials

Dangerous chemicals

Excavations

Power supplies

Working at height

Work at Height, is work in any place, including a place at, above or below ground level where a person could be injured if they fell from that place. This can also include means of access and egress to a place of work. The legislation no longer specifies a minimum height, ‘the 2m rule’. For example, work on the roof of a building, experimental hutch, Portacabin or other raised platform that does not have edge protection. The majority of external building roofs is under the control of site Estate teams and have edge protection.

Electrical work Permit (HT/LT)

LT (Low Tension) vs HT (High Tension) ... High tension or HT supply is applicable for bulk power purchasers who need 11 kilo-Volts or above. Most small consumers of electricity like individual houses, shops, small offices and smaller manufacturing units get their electricity on LT connection.

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