Hot work permit system purpose and Hazards in Detail

Hot work in one of the dangerous work which had claimed a number of lives over the past years and even continues due to various hazards associated with it and lack of awareness and proper information of control measures. In this detailed article, we are going to discuss Hot work permit system purpose and Hazards.

Permit to work system in very crucial for industry as it is a administrative part that help to create safe working environment and we had discussed importance of work to permit in details along with types of work permit at workplace of which Hot work permit is one of them. We had also discussed confined space entry in details including example and precaution.

Metals are widely use in any chemical industry as equipment used in the manufacturing process are made up of metals like stainless steel, mild steel, nickel, and many more. These metal equipment and especially pipeline damages over time because of various reasons and causes punctured from joints and leakage, line broker and damage. Apart from those, fabrication of new line, provide tapping in existing line, removal of lines are someof the job in which welding work is required.

As hot work is very risky and has high potential to cause human and property damage, proper safety measure are needed to be taken and the best approach to avoid hazards are permit to work. Permit to hot work can helps to minimize the risk and help to prepare in case of emergency.

hot work permit safety permit

Safety officer must have proper knowledge of hot work as any mishap can result in huge human and property loss. Safety is everyone’s responsibility, hence If you are a process engineer, production engineer, and maintenance engineer you should be aware about the hazard of hot work and precaustion that are needed to be considers while planning for hot work. So without wasting more time, let us dive into the detailed guide on What is hot work, examples, hazards and hot work permit procedure.

What is Hot Work

Job or activity refers to a hot work job if in which source of ignition is generated through heat, spark or through open flame. In other words, if a job in which spark or heat is genereate which can cause fire is knows as hot work. Hot work can be of classified as Direct hot work and Indirect hot work. When the work is being conducted and it involes equipment produce or liberate open flames falls under direct hot work and if using equipment like grinder and because of that sparks are genereate are indirect hot work.


  • Welding, of pipe, brazing, and soldering.
  • Metal Grinding and cutting.
  • Use of flame to heat
  • Use of hot air blower and heaters

Purpose of Hot work permit form

The primary purpose of the hot work permit system is to reduce and hazard related to hot work. Hot work claims to take life in numbers every year and most of them are due to a lack of proper knowledge and failure to identify the potential hazard. The hot work permit is an administrative tool and a checklist that helps the working personnel to check and identify all the associated hazards and takes proper controlling measures and hereby reduce the risk of an accident while performing hot work task. Hence the purpose of the hot work permit is reduce the risk involved in hot work and prepare in case of emergency.

What are the hazards of hot work?

Hot work generated source of ignition which has potential to complete fire triangle if the flammable/ explosive material present in the area and atmosphere contains sufficient volume of oxygen. Hot work can be very dangerous and because of that there are number of hazard associated with hot work.

  • Hazards like, fire to equipment or in area, explosion, skin burn to human are associated with hot work.
  • Confined space has a danger of accumulation of dangerous gases
  • Metal spark from grind in eye
  • Exposure to Harmful UV or Infrared Light
  • Hot work also includes electrical equipment hence electrical hazards like shocks due to faulty wiring, short circuits and fatal electrocution.

What is hot work safety precautions?

Every work that in needed to be done should be perfome by person wearing personal protective equipements. Suitable eye and face protection should be ensure

  • The area must be checked and should be free from the presence of any flammable substance or material. There are flammable gas detector available which can detectes presence of flammable gases in the area.
  • LEL% limit for hot work is 0% and no hot work permit should be approved if LEL is 10% or above.
  • Proper equipment like welding helmets and other equipment required for the job must be standardized and checked its integrity.
  • The area in which hot work needs to be preform must have proper ventilation.
  • A fire extinguisher must be available in the area where hot work in progress.
  • A standby trained fire person (Fire watch person) should be deployed where the work needs to be performed.
  • The area should be barricaded and no unauthorized person should be allowed to enter the premises.

Now, we had learned all about hot work, hazards and safety precautions, but there can be possibility that human error can miss out some important points while inspecting and make it as dangerous to work. In order to eleminate those risk, hot work pemit is perpared which will help to reduce any human error while identifying hazard and cause accident.

Hot work permit procedure

Firstly production department authorized person will inspect the job which is needede to be done and involves generation of heat or falls under Hot work. Now they dicuss the work with maintenance department regarding it and they identify the hazard associated with the work. Maintenance department will arrange all the equipment and manpower required for the work and check the integrity of the equipment which are going to be use in the task.

After inspecting, production department prepare hot work permit for the task after inspect according to the checklist and options present in the hot work permit form. After production department supervisor prepare the permit, it is then sent to production manager or area manager for the approval where he verify all the checkpoint. After approval, permit sent to maintenance department engineer for the verification and person who is going to perform that job is being . After that, the permit sent to the head of the maintenance department for approval. After approval from the production and maintenance department, the safety office is being informed by the mean of permit and he then verifies all the points on the permit with arrangements.

If require, he do the arrangement i.e. assign fireman for supervision, provide PPEs or fire fighting equipments to make the work more safe and then ask the maintenance department to proceed with the job.

This is the proper hot work permit flows where apart from the hot work permit checklist, senior persons are being taken for the approval to avoid any mistake.

FAQ (Hot work permit)

1. When is a Hot Work Permit Necessary?

When even a work which need to be conducted includes job when the temperature is going to be high or spark will be generated, hot work permit is necessary.

2. When is a hot work permit required

If any activity or job in needed to be perform and it produce ignition source though heat, spark or open flame then hot work permit is required to conduct such job.

3. Who issues a hot work permit

Production department issues the permit to maintenance department to conduct work and work approval is taken by head of department and safety officer.

Wrapping Up

This was the detailed guide on Hot work permit in chemical industry. If you have any doubt regarding hot work permit or have any suggestion, you can use comment section to talk to us. We had covered other work permits as well in details which a production and maintenance person should aware of. Another work which comes next to this is confined space work permit which is also covered by us in detail, so read that also. You can follow us on linkedin – Chemical Tweak to stay updated with our article and also download our android app.

Me - Founder of Chemical Tweak - A Chemical Engineer by profession and a part-time self-trained technology blogger.

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