GD - AIPermit Control

A demonstration build

Permit to work, controlled by the competency register.

Built on IGEM/GL/6 for principal contractors working on the UK gas distribution network. It will not let a permit skip a stage, and it tells you which clause said so.

ForPrincipal contractors
Built onIGEM/GL/6 Edition 3
Prepared1 September 2026
In this documentSeven sections

What it does not do.

Said first, because the rest is easier to judge once this is clear.

It is a permit to work, and only that

GL/6 sets out four documents for the safe control of operations: the permit to work, the non-routine operation, the routine operation and the form of authority. This handles the permit to work. The other three are outside it.

The risk assessment stays yours

The method statement, the controls and the competency evidence are the contractor’s. The system records the references, tracks where each control was confirmed, and refuses to proceed without them. It does not write them.

It is not a substitute for a safe system of work

It records and enforces one. The duty holder’s obligations are unchanged.

How it works.

It will not let a permit skip a stage

GL/6 Section 5 sets an order across two people and the system enforces it. The Engineer cannot authorise before he has attended site. The Competent Person cannot sign before he has been briefed. Nobody verifies their own handback. Each refusal names the clause.

Nobody is named on a permit unless the register says so

Competence is a precondition, not a box. The Responsible Engineer grants status; a person without it is not an option on the screen. A registration about to lapse is found months ahead, not the week before.

Nothing is edited after the fact

An act is recorded once, with who did it and the moment the server received it. A correction is a new act that says what it corrects. Whether a permit is live is worked out from the record every time it is read — there is no field that could disagree with what happened.

A control is confirmed at a place, not on a form

Five controls across two excavations is ten confirmations, and the permit shows which have been made and which have not. A tick on a sheet cannot say where somebody was standing.

A day worked without a check shows in red

On paper a missing initial and a day nobody worked look identical. GL/6 5.5.7 asks for an initial at the commencement of each day; the system knows which days the work ran.

The permit is the standard’s own form

Sections A to G, lettered as Appendix 5 letters them, with the seventeen conditions of Box C and the two atmospheres of Box D. It can be read beside the standard.

What it refused.

Five things the system stopped during the build, in the words it used. A feature list cannot show you this.

1

A permit that would have been authorised before anybody attended site

"Authorised and issued has not been completed. Clause 5 allows no stage to be skipped or taken out of order." The Engineer had prepared it, referenced the RAMS and set the period. He had not arrived. GL/6 5.3.4 puts authorisation and issue on site.

2

A Competent Person accepting a permit before he had been briefed

5.5.3 has the Engineer brief him; 5.5.4 has him sign afterwards. On paper the two signatures sit side by side and nothing records which came first. Here the second is refused until the first exists.

3

A deep excavation refused for a competency nobody had checked

"No record held for EXC-SUP." The activity requires it, the register did not hold it, and the permit stopped at eleven stages of nineteen. The refusal is the document worth reading.

4

A reference the system had been inventing

The SCO desk reference was being generated in sequence. GL/6 A5.4: it is obtained from the Network Controller, and only for work on an operational site within a fixed permanent boundary. Highway work is not that. It now reads N/A, because inventing a reference no operator issued is worse than leaving it blank.

5

A daily check recorded before the permit existed

The check was at 07:20. The permit was valid from 07:30 and authorised at 09:34. A Competent Person cannot reaffirm compliance with a permit that has not been authorised.

The register behind it.

Cover by role and by unit. A number is how many hold that unit today; amber is how many lapse within ninety days; a dash means the role does not need it.

SCO-CORESafe control of operations — everybody
AUTH-CPAuthorised as a Competent Person
AUTH-AEAuthorised as an Authorising Engineer
EXC-SUPExcavation over 1.2 m
HOT-WORKHot works near live plant
RoleHeld SCO-COREAUTH-CPAUTH-AEEXC-SUPHOT-WORK
Permit Controller1 0
Authorising Engineer2 2211 expiring
Competent Person2 221 expiring1

And person by person, worst first — which is the order the Responsible Engineer needs. A lapsed record is not a warning: that person cannot be named on a permit until it is put right.

The register, worst first 5 people · 11 records · 1 lapsed · 2 expiring within ninety days
S. Merrick Permit Controller
SCO-CORELapsed
P. Calloway Authorising Engineer
SCO-CORECurrent AUTH-AEAwaiting the Engineer
M. Ashworth Authorising Engineer
HOT-WORKExpiring SCO-CORECurrent AUTH-AECurrent
R. Beckett Mains Layer
AUTH-CPExpiring SCO-CORECurrent
A. Whitfield Team Leader
EXC-SUPCurrent SCO-CORECurrent AUTH-CPCurrent

Sorted worst first, which is the order he needs. A lapsed record is not a warning — that person cannot be named on a permit until it is put right.

Every permit, and where it stands.

The state is worked out from the record each time it is read. There is no field saying “live” that could disagree with what actually happened. Suspended is not something somebody set — it is what the record says when a hazard was found and no act has restarted the work.

4LIVE Work in progress under an authorised permit
2AWAITING THE ENGINEER ON SITE Prepared and waiting. He cannot authorise until he has arrived (5.3.4)
1SUSPENDED A new hazard was found and work stopped (5.5.8)
3HANDED BACK Certified complete, waiting for the Engineer to accept
1EXPIRED The period of validity ran out before the work finished
27CLOSED Accepted back. The record is complete and cannot change

The permit it produces.

Sections A to G, lettered as IGEM/GL/6 Appendix 5 letters them. Every field is read from the record; none is typed onto the document.

Permit to work
Closed
Copy to be handed to the person in charge of the work and displayed on site Gas escape? Call 0800 111 999
Permit number PtW-0001
SCO desk reference number N/A
If work is part of a separate NRO / RO, RefN/A
A  ·  Work details
Issuing office Netherfield depot
Site address Mill Lane, Netherfield NG4 2AB
Office address Victoria Way, Netherfield NG4 2LX
Locations Excavation 1, Carriageway outside 8 Fort Road
Excavation 2, Junction of Mill Lane and Victoria Way
Valid from Hours on 07:30   Date 29 Aug 2026
Valid to Hours on 07:30   Date 05 Sept 2026
Description of permitted work to be carried out Deep excavation to 2.4 metres to expose and cut out a defective section of 12" IP main
Competent Person in charge of work
Name A. Whitfield
Designation / company Team Leader, Gas Distribution AI
Contact number 07700 900418
Other authorities advised (specify) UK Power Networks notified of the cable exposure
B  ·  Hazard controls to be applied
  Activity Tick if applicable to this permit to work Controls to be applied, and where each was confirmed Additional documentation required to be attached to this permit to work
Working Near Other Plant Considered. No activity in this category applies to this permit.
Mains and Service Construction Considered. No activity in this category applies to this permit.
Hazardous Activity Deep or unstable excavation
Trench box installed before any person enters the excavationExc 1
Ladder access secured, extending one metre above the excavation edgeExc 1
Atmosphere tested before entry and at half-hourly intervals while openExc 1
Edge protection and spoil kept back 1 metre from the excavation edgeExc 1
One person on the surface at all times while anybody is below groundExc 1
Risk assessment, method statement and permitRA/REP24118/07 rev D
MS/REP24118/07 rev C
Permission to proceed NC/SOE15229/0114
Entry into a confined space
Work in an asphyxiating or hazardous (toxic) atmosphere
Working at height where fall arrest systems are employed as part of a risk assessment
Hot works — burning, welding or grinding on live or decommissioned plant
Non-routine work on plant or pipe components containing, or which have contained, toxic or flammable material, or on contaminated land
The controls are the Authorising Engineer’s and the Competent Person’s, agreed jointly under GL/6 5.1.1. The system records them and tracks where each has been confirmed; it does not supply them.
C  ·  Other conditions to be observed
  Condition Applies Detail Excavation 1Excavation 2
1 Render safe sources of ignition within ──── of the workExcept as specified for permitted hot work. 10 m Confirmed
2 The following protective equipment to be available and worn: ──── Flame retardant clothing, gloves, high visibility clothing, head protection, gas monitor Confirmed
3 Breathing apparatus to be worn or available Confirmed
4 Fire fighting equipment to be available Confirmed
5 Hand excavation only N/A
6 Work to be carried out in the presence of ──── N/A
7 Contractors carrying out work covered by this permit to be fully briefed, and their method statements, risk assessments and other relevant documentation to be inspected before they commence work Confirmed
8 Notify the gas or distribution network control centre before commencement and on completion of each day’s work, quoting the permit number: ──── 0800 111 999 Confirmed
9 Live gas area to be fenced off to the satisfaction of the Authorising Engineer Confirmed
10 All excavations to comply with company procedures Confirmed
11 No pipework to be used for the support of trestles, scaffolding or anything else Confirmed
12 The following warning signs to be displayed: ──── Deep excavation, and no entry without a permit Confirmed
13 Resuscitation equipment to be available Confirmed
14 Lifelines and harness to be worn or available Confirmed
15 Continuity bond to be used N/A
16 Voltstick to be used Confirmed
17 Other N/A
D  ·  Atmosphere test requirement
  Substance Test required Initial test Re-test period
Date Time
General atmosphere The Authorising Engineer or their representative may carry out the test (A5.1 a). Natural gas No
OtherSpecify No
Within plant, excavation or confined space A suitably trained and assessed person must carry out the test (A5.1 b). Natural gas No
OtherSpecify No
E  ·  Authorisation
Competent Person in charge of work I have read this permit, understand the work to be carried out and will comply with the conditions to be observed and the attachments.
Signature
Name A. Whitfield
Contact number 07700 900418
Date and time 29 Aug 2026 09:46
Authorising Engineer I am satisfied that the work specified may be carried out subject to compliance with the above conditions and satisfactory test results; that a suitable and sufficient risk assessment has been carried out and is referenced above; and that where appropriate permission to proceed has been obtained from the Network Controller.
Signature
Name M. Ashworth
Contact number 07700 900421
Date and time 29 Aug 2026 09:34
Change of Competent Person (CP) / Authorising Engineer (AE)
   Change 1Change 2 Change 3
Hand Over Complete? (y/n)(y/n)(y/n)
Competent Person in charge of work Name
Signature
Designation / Company
Date & Time
Contact number
Hand Over Complete? (y/n)(y/n)(y/n)
Authorising Engineer Name
Signature
Designation
Date & Time
Contact number
Continuation of works / permit extensions
Work may continue until
DateTime Signature of Authorising Engineer
Not applicable — no extension has been granted. The permit runs to 05 Sept 2026 as authorised.
F  ·  Records of checks carried out
Daily check by Competent Person
Date / Initials 29 Aug 2026 10:23
Date / Initials
Date / Initials
Date / Initials
Date / Initials
Date / Initials
Date / Initials
29 Aug 2026 10:23 A. Whitfield
Cable exposed, fibre boards in place. Ground dry.
Cable exposed, fibre boards in place — Excavation 1 68888122c6a7…
Second cable found, hand dig continuing — Excavation 2 a2db9c9183c6…
G  ·  Completion of work
Competent Person in charge of work I have inspected the work covered by this permit and certify that the work has been completed Signature
Date 29 Aug 2026 16:40
On completion this Permit to Work must be returned to the Authorising Engineer
Authorising Engineer Signature
Date 29 Aug 2026 17:05
Document PtW-0001
Revision Rev 2
Issued by Gas Distribution AI
Gas escape Call 0800 111 999
Form owner Gasworks Project Management Services – FZCO, trading as Gas Distribution AI

What the crew sees.

Photographs of the running app, taken during the walkthrough above. Every screen shows one thing to do and the clause behind it.

Signed on the glassDrawn with a finger on the tablet. Stored with the act, and the same mark appears wherever that person signed.
Cable exposed, fibre boards in place — Excavation 1
Photographed on siteCable exposed, fibre boards in place — Excavation 1 68888122c6a73e6f…
Second cable found, hand dig continuing — Excavation 2
Photographed on siteSecond cable found, hand dig continuing — Excavation 2 a2db9c9183c65197…
The mark, drawn on the glass
A. WhitfieldCompetent Person
M. AshworthAuthorising Engineer

Each person signs with a finger. The mark is stored with the act and is the same wherever they signed — a typed name proves nothing about who held the device.

A photograph, where the claim is physical
Cable exposed, fibre boards in place — Excavation 1
Cable exposed, fibre boards in place — Excavation 1
Second cable found, hand dig continuing — Excavation 2
Second cable found, hand dig continuing — Excavation 2

Three acts ask for one: the daily check, the handback and a deviation. Each is a claim about the world, and a picture answers it. A photograph demanded on every act is a photograph of the ground.

A signature is drawn, not typed

Each person signs with a finger on the glass. The mark is stored with the act, and the same mark appears wherever that person signed — a typed name proves nothing about who held the device.

A. Whitfield
R. Beckett
M. Ashworth

A photograph is the record where the claim is physical

Three acts ask for one: the daily check, the handback and a deviation. Each is a claim about the world — conditions unchanged, the plant left safe, this is what I found — and a picture answers it. Every one carries a hash, so the file on the permit is the file that was taken.

excavation-1.png 68888122c6a73e6f…
excavation-2.png a2db9c9183c65197…

It works with no signal

An excavation is often a place with no bars. Acts are recorded on the device and sent when there is signal; the person sees what is waiting to go. Nothing is lost and nothing is invented while it waits.

Accepted after the briefing
Competent Person · tabletAccepted after the briefing
Crew briefed — next, the preliminaries
Competent Person · tabletCrew briefed — next, the preliminaries
Interacting work checked
Competent Person · tabletInteracting work checked

The Competent Person carries a tablet. The Authorising Engineer usually has a phone, and the same screens fit it.

On site — now the permit may be authorised
Authorising Engineer · phoneOn site — now the permit may be authorised
Authorised and issued, on site
Authorising Engineer · phoneAuthorised and issued, on site
Briefed — the permit is the CP’s to accept
Authorising Engineer · phoneBriefed — the permit is the CP’s to accept

What is not finished.

Nobody has used it on a live job yet

Every screen is a model of a Competent Person built from the standard and from watching the work described. Until somebody has used one in the rain with gloves on, that is an assumption.

The demonstration data is invented

Permit numbers, addresses, reference numbers and the control wording are illustrative. The excavation pictures are drawn and labelled as drawings — fabricating something that looks like site evidence is the one thing a permit system must never do.

It is not deployed

It runs, it is tested, and it holds up under a morning’s load. Hosting, sign-in hardening, backups and payments are the work between here and a service.

More tools are coming.

Permit Control is the first, and the rest are built on the same spine: one register, one set of people, one record. A contractor who takes this one is not committed to anything else.

Run it alongside your current system for two weeks.

On real permits, with the paper still the permit. No charge, and nothing to install. The only question worth asking at the end is where it stopped somebody doing something they needed to do.

Arrange a trial