PTW & SWC Training

Safe System of Work
PTW
Awareness
Eight Principles of a Safe Workplace
Safety is an Ethical Responsibility
Safety is a Culture Not just a Program
Management is Responsible
Employees Must Be Trained to Work Safely
Safety is a Condition of Employment
All Injuries Are Preventable
Safety Programs Must Be Site Specific with Recurring Audits of the Workplace
and Prompt Corrective Action
Safety is Good Business

PTW Systems
The purpose of safe work permit system is to ensure a
stringent control when all non-routine works are
carried out. It also allows works be performed safely
by reducing the chances of misunderstanding when
non-routine activities are to be carried out.
The work permit itself does not make the job safe but it
ensures proper consideration is given to the risks prior
to commencement of work.
Area Classification
Non-hazardous Area
An area in which a flammable atmosphere is not
expected to be present.
Hazardous Area
An area in which a flammable atmosphere is, or may
be expected to be present.
Special precautions for any work activity are
necessary.
Hazardous Area
Hazardous areas are classified into the following three zones:
• Zone 0
• Zone 1
• Zone 2
Zone 0 - Flammable gases and vapors are constantly present
Zone 1 - Flammable gases and vapors are intermittently present.
Zone 2 - Flammable gases and vapors are not expected to be

present unless conditions are abnormal
Types of Permits
& Certificates
The safe work permit system uses four different work permits.
Each has a solid colored border.
The safe work permit system uses seven different certificates in

conjunction with work permits. Each certificate has a colored
border of diagonal stripes.
Types of Permits
Hot Work Permit (RED)
Hot work is any work activity which will or may produce a source of ignition.
Cold Work Permit (GREEN)
Cold work is any work outside of “Routine Work” activity, excluding any work
which is considered to be “Hot Work”

Types of Permits
Electrical Work Permit (YELLOW)
The electrical work permit is used for ANY work involving electrical equipment
or system. The electrical permit is combined with the Isolation Certificate (i.e.) it
is the same document for either application
Radioactive Permit (BLACK)

Any work involving a radioactive source e.g. X-rays, some well logging, etc
requires a radioactive permit.
Although there is no fire hazard attributed to gamma ray radiography work (x-
ray), these activities are potentially hazardous work, requiring additional
planning and precautions that are inherent in hot work.
In the application process, the originator and radiographer in most situations will
most likely the same person
Types of Certificates
Isolation Certificates
Used when any equipment, electrical, mechanical or process must be isolated for
maintenance or repair or any other reason. These certificates facilitate safe
isolation, lock-out and tagging, as well as communication to people concern.
Mechanical / Process Isolation Certificate (GREEN/WHITE)
A mechanical/process certificate is required where there will be ANY isolation of
mechanical or process equipment. The certificate is valid for the period stated in
Section 5 of the certificate. The period could extend beyond the duration of the
accompany work permit, e.g. a machine undergoing maintenance awaiting spare
parts, and the Person In-charge will sign to authorize the extension.
Electrical Isolation Certificate (YELLOW)

The electrical isolation certificate is used for ANY work involving electrical
equipment including isolation for mechanical work, e.g. disconnecting an electric
motor for mechanic to repair the pump. In some instances, it may be necessary to
have both electrical and mechanical certificates in place in conjunction with the
particular work permit pertaining to the job.
Senior Authorized Electrical Person/Authorized Electrical Person is responsible for

applying for the certificate. A competent, qualified/trained person e.g. operator may carry
out the precautions required, such as closing main breaker on MCC panel and installing
lock (tag out procedure). Work associated with high voltage and extra high voltage, the
certificate will be ONLY issued by Senior Authorized Electrical Person.
Lock-out Devices and Procedures
An employee who has to repair, adjust or maintain machinery or other equipment
may run grave risks unless he is certain that the machine or equipment cannot be
started up, energized, or activated until his job is finished.
A lock-out device is a mechanism or arrangement, that allows the use of padlocks
and keys to hold and retain a switch/lever or valve handle in the REQUIRED
position. Effectively installing locks and tags at each isolation point. One lock and
tag WHERE POSSIBLE be installed by the operator and the second lock and tag
WHERE POSSIBLE be installed by the person who will be actually involved in the
work activity.
Ground Disturbance Certificate (BLUE/WHITE)
Ground disturbance certificate is needed whenever mechanical
excavation deeper than 0.5 meters is planned in areas where it is
reasonable to expect underground pipelines, utilities or other
structures.
The ground disturbance certificate is only valid for the duration of
the relevant accompanying work permit

Confined Space/Vessel Entry Certificate (BROWN/WHITE)
A confined space/vessel entry certificate is required to ensure safety
for personnel entering confined spaces or vessel, in order to carry
out inspections, maintenance etc..

Safety System By-pass/Override Certificate

For some work activities on process or mechanical equipment one
or more safety systems may need to be taken out of service. This
may be done through a by-pass, or an override of a safety system or
equipment, e.g. maintenance work on fire pumps,
testing of high level shut-downs, testing of emergency shut-down
alarms.
No by-pass/overrides are permitted without the appropriate safety
system bypass certificate is required
Scaffolding Certificate (ORANGE/WHITE)

Scaffolding certificate is needed for the purpose of safe
construction, alteration and dismantling of a scaffold.
This is to ensure that the scaffold can sustain safely all
imposed wad.
Note: Scaffolding certificate does not standalone; it
becomes invalid without an accompanying work permit
Lift Certificate (PURPLE/WHITE)

A lift certificate is required for all lifts not classed as
routine such as lifting over process equipment or
wellheads, lift with sling not made of wire rope, multiple
crane lift, lifts exceed 8 tons and lifts inside of confined
space.

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Safe System of Work

Safety is an Ethical Responsibility

Safety is a Culture Not just a Program

Employees Must Be Trained to Work Safely

Safety is a Condition of Employment

All Injuries Are Preventable

Safety is Good Business

Hazardous areas are classified into the following three zones:

Zone 0 - Flammable gases and vapors are constantly present

Zone 1 - Flammable gases and vapors are intermittently present.

Zone 2 - Flammable gases and vapors are not expected to be

The safe work permit system uses seven different certificates in

Hot Work Permit (RED)

Cold Work Permit (GREEN)

which is considered to be “Hot Work”

Radioactive Permit (BLACK)

Mechanical / Process Isolation Certificate (GREEN/WHITE)

A mechanical/process certificate is required where there will be ANY isolation of

accompany work permit, e.g. a machine undergoing maintenance awaiting spare

Electrical Isolation Certificate (YELLOW)

Senior Authorized Electrical Person/Authorized Electrical Person is responsible for

An employee who has to repair, adjust or maintain machinery or other equipment

started up, energized, or activated until his job is finished.

A lock-out device is a mechanism or arrangement, that allows the use of padlocks

Ground Disturbance Certificate (BLUE/WHITE)

Ground disturbance certificate is needed whenever mechanical

excavation deeper than 0.5 meters is planned in areas where it is

reasonable to expect underground pipelines, utilities or other

The ground disturbance certificate is only valid for the duration of

the relevant accompanying work permit

Confined Space/Vessel Entry Certificate (BROWN/WHITE)

A confined space/vessel entry certificate is required to ensure safety

for personnel entering confined spaces or vessel, in order to carry

out inspections, maintenance etc..

Safety System By-pass/Override Certificate

Scaffolding Certificate (ORANGE/WHITE)

Lift Certificate (PURPLE/WHITE)

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