Operations that require Permit to Work

By | 2018-01-22T07:43:33+00:00 January 21st, 2018|HSE MS|1 Comment

# Title Description Examples Attachments
1 Hot Work A Hot Work is a work with a potential source of ignition or if it may produce a possible source of ignition.

Exemption: Hotwork in Welding Shop

  • Grinding
  • Chipping
  • Cutting
  • Welding
  • Burning
  • Temporary use of internal combustion engines and non-intrinsically safe (IS) equipment in Zones I or 2
  • Risk Assment
  • TBT
  • Fire Warden Checklist (on PTW)
2 Work at Height Working above 2 m where fixed or temporary guarding is not provided is considered as Work at Height.

Exemption: Derrickman racking pipes on Monkeyboard level

  • Manriding Activities by Winch, Crane or Telehandler
  • Erecting or dismantling scaffolding
  • Greasing on Crown block
  • Dismantling/Removing of handrails, ladders, grating (rigging down and rigging up)
  • Risk Assment
  • TBT

Depending on the Ops nature:

  • F-24 – Pre-Manriding Checklist
  • F-79 – Crane Manbasket Checklist
  • Scaffolding checklist (by 3rd Party)
3 Works with Dangerous Substances 
  • Work with radioactive materials
  • Work with explosives
  • Work with Chemicals without SHOC card
  • Work with NORM contaminated equipment
  • etc.
  • Risk Assment
  • TBT
  • F-25 – Radio Silence Checklist
  • Explosives Checklist (by 3rd party)
4 Pressure Testing Pressure testing of equipment, piping systems or hoses according to relevant procedures. Pressure test of the following units/equipment:

  • Cement Unit
  • BOP
  • Test manifold
  • Choke manifold
  • Pressure lines
  • Pressure vessels
  • Well head
  • Silo
  • etc.
  • Risk Assment
  • TBT
5 Confined Space Entry A confined space is any area with limited or restricted means for entry or exit and is not designed for continuous occupancy.
  • Cellar
  • Mud Tanks
  • Sewage tanks
  • Water tanks
  •  Silos
  • Hydrocarbon tanks
  • Risk Assment
  • TBT
  • Confined Space Entry Checklist (on PTW)
  • F-11 – Confined Space Monitoring Sheet
  • Isolation Certificate
6 Well Operation/Well Intervention
  • Wireline operation/production logging
  • Perforation
  • Well stimulation
  • Coiled tubing operation
  • Setting plug in or removal of X-mass tree.
  • Well testing activities, flow tests in particular
  • Risk Assment
  • TBT
  • F-39 – 3rd Party Equipment
7 Isolation of Safety System Work that involves isolation and testing or bypassing of safety systems.


For detailed listing of safety systems refer to HSE Case

  • Emergency shutdown systems
  • Firefighting systems
  • Pressure Relief systems
  • Detection systems
  • Alarm systems
  • Emergency power and non-interruptible power supply
  • BOP and diverter systems
  • Any other system designed or used to form a safety barrier.
  • Crown-o-Matic
  • Floor-o-Matic
  • Risk Assment
  • TBT
  • Isolation Certificate
8 Lifting
  • Lifting Personnel
  • Lifting more than 5t
  • All non-routine operations
  • Tandem Lifting
  • Lifting over pressurized equipment such as producing wells, or pressure vessels
  • Risk Assment
  • TBT
  • F-59 – Lifting Plan
9 Other Any operation that may pose a hazard due to its nature, or due to lack of safety barriers.
  • Non-routine maintenance in mast during normal operations
  • Working on equipment that requires any kind of isolation, either mechanical or electrical.
  • Re-charging of Nitrogen Bottles.
  • Grit blasting.
  • Pressure cleaning of tubulars by contractor.
  • Work on any Drilling Critical Equipment while drilling or workover
  •  Opening various valves that might lead to a spill of hazardous substances to the nature
  • Installation of any third party equipment
  • Excavation on location while Unit is operating
  • Any Maintenance of any auto start or remote starting equipment
  • Work above or around water tanks or pits
  • Erecting or moving equipment in close proximity to overhead power lines
  • Work on electrical equipment in excess of 50V AC or 120V DC when isolation is not possible including all electrical work performed in Class 1 Areas, Zone I or 2
  • Work on energized and powered equipment requiring isolation from energy sources (electrical, mechanical, hydraulic, or pneumatic)
  • Use of high pressure jetting equipment (>2000psi)
  • Risk Assment
  • TBT
  • Isolation Certificate
  • F-39 – 3rd Party Equipment

*Red points are taken additionally from Shlumberger procedures

About the Author:

HSE Professional with more than 14 years experience in the Upstream Oil & Gas industry. Created this website to help the HSE Professionals from around the globe to form a sharing and learning community. My inspiration in HSE is a verse from Quran: whoever saves one - it is as if he had saved mankind entirely [Quran, al Maida 5:32]