Facilities in oil and gas consist of numerous pipelines, meters, valves, vessels, separators, pumps, instrumentation and many other pieces of equipment. Knowledge of interconnections between those elements is crucial for operation, maintenance, inspection and troubleshooting of any facility.
And this is when measurement drawings come into play.
Measurement drawings show measurement equipment, its interconnection and location of various measurement points on an oil and gas facility. These drawings help field personnel to understand facility configuration and locate various measurement points.
But a drawing itself is not enough to get the job done. Drawing should be accurate, up-to-date and accessible. Inaccurate drawings cause confusion and wrong decision making in the field.
What Are Measurement Drawings?
A Measurement Drawing is a technical description of the measurements performed in a facility. Depending on the facility and needs, this includes meters, piping, valves, instruments, flows, measurement points, and connections to other assets.
It serves as a visual guide on where the measurement equipment is placed within the whole production process.
The use of measurement drawings is especially relevant to oil and gas companies as there are many parts of the measurement systems and each change in one may influence other parts of the measurement system.
Up-to-date measurement drawing system can help by linking the drawings to the asset information.
Why Accuracy Matters in Oil and Gas Facilities
1. Helps Operators Understand Facility Layouts
Oil and gas facilities are not easily understood by personnel who are not familiar with the particular facility.
An accurately drafted measurement sketch is a tool that makes it easier for operators to know the location of the equipment and how the various equipment is connected.
Rather than remembering or tracking the pipes and equipment, personnel can consult the sketch for an understanding of the measurement setup.
This is especially helpful where the facilities have been expanded or upgraded in one way or another.
2. Supports Faster Troubleshooting
In the event that there is a measurement problem, it is vital to be able to quickly ascertain its cause.
The meter may display an unusual reading owing to a problem with the meter itself, an upstream device, instrumentation, valves, or other parts of the measurement system.
Detailed drawings provide more information as to where a technician can begin his troubleshooting task. It will allow him to trace connections, pinpoint important devices, and understand the connection between the various pieces of equipment.
Without the aid of such drawings, troubleshooting could take longer since the personnel must conduct physical investigation of the system first.
3. Reduces the Risk of Working From Outdated Information
Facilities evolve with time.
New equipment might be added, existing equipment might be taken out, pipelines might be reconfigured, and measuring systems might be modified. When this happens without updating the drawings, then documentation will eventually lose consistency with the reality of the facilities.
It is a major issue.
A technician working off of an old drawing may think that a particular piece of equipment is located or connected differently than it actually is. This wastes time and, in certain cases, can create potential risks.
Having up-to-date drawings allows the documentation to accurately portray the real state of the facility today.
4. Improves Maintenance Planning
The maintenance crew requires precise details about the equipment and system configuration in order to plan their activities.
Measurements drawings would assist technicians in determining what equipment will be used in maintenance work and how it is connected to other equipment.
For instance, in the process of maintenance of a meter or measurement equipment, the technician must know what equipment is there upstream and downstream from the meter. This can be done with the help of an accurate drawing.
Moreover, it would assist in determining additional equipment that would have to be checked.
5. Supports Field Technicians
Field personnel frequently work in an environment where equipment is scattered in wide spaces.
Locating a particular meter, tool, or connector may be time-consuming especially when working in an unfamiliar plant. A well-made drawing serves as a guide that can assist the field personnel in locating the proper equipment.
Accessing such drawing digitally may make the process even easier. Rather than going through several folders to find the printout or old copy of the drawing, one can simply access the document via computer or phone.
This becomes all the more important when the field and office personnel need to share the same document.
6. Makes Facility Changes Easier to Track
Facility modifications should not end with the physical installation of new equipment. The corresponding documentation also needs to be updated.
Measurement drawings can serve as part of a facility’s change-management process.
When a meter is replaced, a pipeline is modified, or an instrument is relocated, the drawing should reflect the change. Maintaining a documented history of changes can also help teams understand how the facility has evolved.
A centralized approach to drawings can provide version control and help ensure personnel are working from approved documentation. Modern database-driven drawing systems can link drawing elements with underlying data and maintain version information.
7. Supports Measurement Accuracy
Measurement is a very essential process in the oil and gas industry. The amount of production, allocation, reporting, balancing, and even business may all depend on the measurement data.
Though diagrams alone will not assure accurate measurements, they can help in understanding what is happening at the measurement level.
The diagrams will inform the staffs about the location of the measurement, what kinds of equipment are used and how these pieces of equipment are related.
The diagram will complement other measurement management processes in discovering any inconsistencies.
The Problems Caused by Outdated Measurement Drawings
The absence of accurate documentation can have several consequences.
Slower troubleshooting: Technicians may spend additional time determining how equipment is connected.
Longer maintenance activities: Crews may need to verify field configurations before beginning work.
Communication gaps: Different teams may rely on different versions of facility documentation.
Higher operational risk: Personnel may make decisions using information that does not match the physical facility.
Difficult change management: Facility modifications become harder to track when documentation is inconsistent.
These issues can become more significant as facilities grow and their measurement systems become increasingly complex.
What Should Accurate Measurement Drawings Include?
The exact information will vary by facility, but useful measurement drawings should generally provide clear information about:
- Measurement equipment and meters
- Piping and flow paths
- Valves and relevant control points
- Instruments and associated components
- Equipment connections
- Asset identification
- Measurement points
- Relevant configuration information
- Revision or version information
The objective is to create documentation that reflects the physical and measurement configuration of the facility rather than simply producing a static visual diagram.
Moving Beyond Static PDFs
Even today, PDF drawings continue to prove useful in several situations, although static drawings may become increasingly hard to handle in changing facilities.
An alternative data-connected solution is likely to make handling of drawings much easier and more accessible. Rather than viewing the drawing as an independent document, organizations could integrate it with the corresponding asset data.
A data-connected strategy will not only facilitate the management of a centralized repository but also help with revisions and updates of relevant documentation.
The result is a more useful source of operational information that can support both field and office teams.
Making Measurement Drawings Part of Facility Management
Measurement drawings should not be treated as documents that are created once and forgotten.
They are an important part of maintaining an accurate understanding of an oil and gas facility. As equipment changes, the corresponding documentation should change with it.
Accurate and easily available drawings will ensure that operators can solve any problem, help maintenance personnel, improve communications, and minimize the hazards related to the availability of out-of-date facility drawings.
In the case of oil and gas companies, the importance of measurement drawings depends on their ability to represent the configuration of the measurement systems reliably. The more accurate, up-to-date, and available this information is, the more practical it becomes.