I don't think there is any legal requirement.

I used to work in the oil / chemical industry. Permits were "suspended" at the end of the working day if the work had not been completed and then re-validated at start of play the next day.

This was to ensure that the work site had been left safe at the end of the day and that safety was reviewed again prior to work re-starting the next day. Work might not be able to re-start, for example, if other work was now taking place nearby. The re-validation of the permit is, to my mind, looking to confirm that the situation at the worksite and the work tasks have not changed - thus ensuring work can recommence safely. It must also look at the impact of the work on any other work taking place nearby.

We also ran a shift handover log which ensured that open permits were discussed with the incoming shift manager ( not often used as we normally ran one shift ).

This procedure applied to both our own team and any contractors.

So I guess the answer is that the re-validation is important and becomes increasingly important on higher risk tasks and locations.

You can also use the re-validation to stress the importance of safety with your contractors.

Vinod, perhaps you have used the term "legal requirement" in a diiferent context.
I see that you are based in the Middle East.
In UK, the term "legal requirement" means it is statutory law, i.e Acts/Regulations passed by the parliament. The term legal requirement does not generally include Codes of practice from the enforcement bodeis, British, European & International /Industry standards etc.

Vinod,

if you are working for an oil and Gas industry, than indeed it is legal requirement in terms of it being part of COP for major oil companies. but for construction industry, i have not much experience but it depends on the contractors and sub contractors COP.

if you are in UAE, if i remember correctly, there is no statuary law in terms of PTW in UAE government. but all major oil companies like ADCO,ADMA,ADGAS, ADNOC and so on have it part of mandatory requirement in COP's PTW section

hope it helps

I have recently re written a Permit to Work (PTW) policy for a customer following a fire risk assessment

It most certainly includes a 're validation' rule if the the works to which the permit is issued is broken by staff leaving the site at the end of their working day. For continuous work where a shift change is likely, a handing-over requirement is a condition of the PTW.

The main rationale is that - as this particular customer use numerous contractors- there is no guarantee that the same workers will return the next day. In such cases it is necessary for the 'new' staff to be fully aware of the specific restriction that may apply. A new or revalidated PTW is the route this customer has accepted as the most appropriate for their needs.