RO vs NRO: Difference Between Routine and Non-Routine Operations in SCO
Understanding Two Key SCO Operational Control Documents
One of the most common questions asked during SCO training is:
“Should this activity be controlled using a Routine Operation (RO) or a Non-Routine Operation (NRO)?”
Both documents form an important part of the Safe Control of Operations (SCO) framework used within UK gas network operational control and are used to help plan, communicate and safely manage operational activities. If you’re new to SCO, our guide to SCO Principles explains the foundations that underpin operational control activities.
Whilst they share many similarities, they are designed for different types of work and different levels of operational complexity.
What is a Routine Operation (RO) in SCO?
A Routine Operation (RO) is generally used for planned activities where:
- The methodology is established
- The risks and controls are well understood
- Similar activities have been successfully completed previously
- The operation can be undertaken using existing procedures and controls
An RO provides a structured approach to planning and communicating the operation but does not replace the need for risk assessment, engineering procedures or competent personnel.
Typical RO Activities
- Mechanical under-pressure tee connections
- Routine valve operations
- PE Branch Saddle Connections
- Network Extensions
What is a Non-Routine Operation (NRO) in SCO?
A Non-Routine Operation (NRO) is generally used where the activity is more complex or where the consequences of failure could be more significant.
NROs typically require:
- Enhanced planning
- Greater consideration of network impacts
- Detailed contingency arrangements
- Increased communication and coordination
NROs are commonly associated with Medium Pressure (MP), Intermediate Pressure (IP) and High Pressure (HP) systems, although they are also used for large diameter Low Pressure operations within gas distribution networks.
Typical NRO Activities
- Elevated pressure operations
- Major network connections
- Complex live gas operations
- Activities with significant security of supply implications
RO Vs NRO: Key Differences
| Routine Operation (RO) | Non-Routine Operation (NRO) |
|---|---|
| Planned and established activity | More complex operational activity |
| Lower operational complexity | Higher operational complexity |
| Established methodology | Enhanced planning required |
| Standard contingency arrangements | Detailed contingency planning |
| Lower impact on security of supply | Greater potential impact on security of supply |
| Generally less coordination required | Greater coordination and communication required |
Important Point in SCO Decision-Making
A common misconception is that an RO is simply a “low-risk NRO”.
This is not the case.
When assessing RO vs NRO, the decision is based on the nature, complexity and operational impact of the activity, not simply the perceived level of risk.
Both documents rely upon:
- Suitable risk assessment
- Competent personnel
- Effective communication
- Appropriate authorisation
Neither document makes the job safe on its own.
The Role of the Competent Person and Authorising Engineer in SCO
Whether using an RO or NRO, the relationship between the Competent Person (CP) and Authorising Engineer (AE) remains critical within Safe Control of Operations (SCO) procedures.
The AE is responsible for ensuring the procedure is suitable and appropriately authorised.
The CP is responsible for implementing the controls, maintaining site safety and ensuring the operation is undertaken in accordance with the authorised procedure.
Success relies on effective planning, communication and understanding of responsibilities.
Final Thoughts on RO vs NRO in SCO
ROs and NROs are both essential tools within the SCO framework.
Understanding RO vs NRO helps ensure the correct level of planning, communication and control is applied to each operation within gas network operations and SCO-controlled activities.
When used correctly, both documents support the safe and efficient delivery of gas network activities whilst helping maintain security of supply and operational integrity. Maintaining competence in the use of ROs and NROs is an important part of ongoing professional development.
Need Help Understanding SCO Operational Controls?
Pragmatic Consulting delivers SCO training and renewal programmes covering:
- SCO Core
- Permit to Work (PtW)
- Routine Operations (RO)
- Non-Routine Operations (NRO)
- Form of Authority (FoA)
- We provide both full courses and renewal courses for those needing to refresh their knowledge
Helping delegates understand not only the documentation itself, but how it is applied in real-world operational environments.
You can find out more about all our SCO courses here.
Further Reading
You might also be interested in our related articles:
Five Key Five Key Principles of SCO (Safe Control of Operations)
