What is Permit to work system? What are the requirements of permit to work? Different types of permit to work system such electrical, hot and cold work etc.

1. Prepared by Asif

2. © RAGC – for private circulation only
WHAT IS PTW?
A permit to work is a document used to
communicate the details of the work
being carried out, hazards associated
with the work, control measures
implemented precautions to be taken
to everyone who could possibly be
affected or involved due to that work.

3. © RAGC – for private circulation only
A permit to work in general should have,
 Permit number
 Location
 Any special consideration or limitation
 Precautions to be taken to avoid any hazard
 List of personal protective equipment.
 Authorization of permit to work by competent person
 Acceptance
 Hand book
 Cancellation
HSE guideline for permit to work

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Confined space
Plant where hazardous gas are present
A work require highly toxic substances
or inflammable articles
Pressure testing
Ionizing radiation
Hot work
Hazardous space
Working in lifts
Where Permit to work is required?

5. © RAGC – for private circulation only
Role of the competent person (Authorizer)
 PTW obtained from Facility administrator
 No other work being carried out during that time
 Time required to complete the work is clearly
identified
 Permit to work issuance/ cancelation procedure is
understood by every one.
 Visit the site for inspection to ensure control measures
are taken
 A permit to work should be displayed near the site,

6. © RAGC – for private circulation only
PTW for electrical services
Electrical PTW is required for below works in general,
 A switch or an isolator is to be switched off that can affect
an IT equipment or pose threat to visitors, employees or
contractors etc.
 If live equipment distribution system is to be tested
 Any work that poses a shock hazard
 Testing earthing system while supply is on.
 Maintenance work on any equipment that works on
electricity.

7. © RAGC – for private circulation only
Any work involving equipment giving rise to a Definite
source of ignition, such as:
 use of equipment for oxy-acetylene burning,
 gas welding, electric-arc welding,
 propane torch heating and burning,
 grinding or use of a hot-air gun.
What is a Hot (Naked Flame) Work?

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Any work involving, or giving rise to, a
Potential source of ignition, such as:
 Grit-blasting
 Work on non-intrinsically safe equipment
 Using non-certified electrical equipment not
controlled by an Electrical Permit (e.g. Avometer,
power tools etc)
 Spray painting
 Use of Camera with flash
What is a Hot Work?

9. © RAGC – for private circulation only
What is a Cold Work?
Cold Work- Any task, or the use of any tool or equipment that will
not produce a source of ignition. Such as:
 use of tools for erection, dismantling and cleaning, which
are not liable to produce sparks,
 Pressure testing of plant and equipment
 Disconnection or opening up of any closed pipeline or
vessel
 Spading and de-spading of hydrocarbon line
 Chemical cleaning
 Handling of hazardous substances, e.g. radioactive
source, toxic / corrosive chemicals, asbestos, etc

10. Validity
Hot Work, Naked Flame and Cold Work Main
Permits, all have same validity period.
7 Consequent
SHIFTS or 7 Days
Maximum!

11. PTW Procedure
INITIATION / PREPARATION OF PERMIT
TO WORK
LIST OF EXTERNAL REQUIREMENTS
SUCH AS: SAFETY EQUIPMENT, STATUS
OF PLANT, NEED FOR COMPLEMENTARY
PERMITS ETC.
PERMIT AUTHORISATION, ISSUE AND
ACCEPTANCE FOR WORK TO START
REVALIDATION AT THE START OF EACH
SHIFT
PERMIT CANCELLATION ON
COMPLETION OF WORK

12. PTW Procedure Definitions and Duties
PTW Procedure
Definition
Duties
Responsible
Person
Task Supervisor
Initiates permits.
Defines scope of work.
Person responsible for the work
Safety Authority
Defines safety requirements.
Monitors working practices.
Area HSE Manager
Installation Authority
Authorises work go-ahead.
Defines plant status for work.
Area Commissioning Manager
Area Authority
Arranges any required isolations.
Approves work go ahead.
Commissioning Shift Supervisor
Permit Controller
Checking of permits before issue.
Administration of PTW Procedure.
Logging / Filing of cancelled and/or suspended permits.
Ensures no conflict of work between different area
authorities.
Permit Controller
Authorised Gas Tester Performs all required gas testing.
Senior HSE SV
Commissioning SV
Senior Panel Operator
Performs inhibits and enables on Fire and Gas and ESD
systems.
Senior Panel Operator

13. © RAGC – for private circulation only
DISTRIBUTION
• Copy 1, kept at the work site, on display, for duration of activity
• Copy 2, with Safety Authority form checking of continuous
compliance
• Copy 3, in Permit Office
• Copy 4, with Area Authority for checking of continuous
compliance

14. © RAGC – for private circulation only
Lock put Tag Out

15. © RAGC – for private circulation only
Process / Mechanical Isolation
This Complementary Permit is required to withdraw
equipment from service by physical isolation, usually
by valve.
Isolation Certificate:
Combines in one document record of all
isolation required for a task to be
carried out safely. The control and use
of isolation certificate are described in
`the permit to work procedure.

16. Are Valid as far as the isolation
is implemented without limit of
duration.
ISOLATION CERTIFICATE

17. ISOLATION CERTIFICATE
Certificates are Not
Permits!!
They are Added to Permit
to Confirm Isolation status
of an Equipment

18. © RAGC – for private circulation only
High Voltage Electrical Isolation
This Complementary Permit is required for all
isolation work on electrical systems or equipment
where the voltage exceeds the following limits:
1000 volts AC or 1500 volts DC between conductors.
600 volts AC or 900 volts DC between conductors
and earth.
Any situation except above condition will be
covered under Low Voltage Electrical Isolation
Permit

19. © RAGC – for private circulation only
Sanction for Test
This Complementary Permit is required to test individual
or multi-discipline items of equipment. It allows for
temporary removal of safety isolations and the provision
of temporary actions to override or remove equipment to
carry out such tests.

20. © RAGC – for private circulation only
Limitation of Access
This Complementary Permit is required to work in any
area close to live electrical systems or equipment. A
Limitation of Access Permit is not required where the
work to be performed is already covered by any of the
other Main Permits. All Limitation of Access permits
shall be authorised by electrical authorised persons

21. © RAGC – for private circulation only
Steps for lockout tag out procedures
 Identify authorized person
 Communicate the procedure
 Equipment to be carried to complete the work
 Isolation
 Dissipation of stored energy
 Lock out Tag out
 Verify isolation
 Test
 After completion ensure no equipment's left
behind

22. © RAGC – for private circulation only
Thank You