A plant that is mechanically complete but has unverified instrumentation is not ready: it is blind. And the moment you find out, during commissioning, with the client present and the schedule already used up, is the worst possible time to fix it.
Our scope, stated.
On E&I we cover field instrumentation. We do not claim competence in power switchboards, transformers or electrical distribution, because that is not our ground.
We say so explicitly for a practical reason: a contractor who claims everything forces the client to discover on site where its competence really ends, and that moment always comes at the worst stage. A scope declared in advance can be planned; a scope discovered along the way has to be endured.
Within that boundary we cover the full cycle: from the mechanical mounting of the instrument to point-to-point functional testing up to the control system, with the documentation that goes with it.
What we do.
Installation
Mounting of pressure, temperature, level and flow transmitters, with impulse lines and process connections. The quality of the instrument’s mechanical installation determines the reliability of the measurement far more than the instrument’s own specification: a badly made pressure tapping gives an unstable reading that no calibration can correct.
We take care of slopes, vents, drains, supports and vibration protection, and check that the installation matches the project hook-up drawings.
Calibration and verification
Calibration with traceable reference standards, linearity check across the full measuring range and recording of as-found and as-left values. The as-found reading tells you whether the instrument was measuring correctly before our intervention, and it is the only data that shows whether a process problem was real or a measurement problem.
Loop check and functional testing
Point-to-point verification from the field to the control system: continuity, polarity, tag correspondence, signal consistency, alarm and trip setpoint checks. Installation of positioners on control valves with stroke and response checks.
Hazardous areas
Installation in areas with an explosion hazard, respecting the protection method required by the classification: enclosure integrity, correct terminations, distances and seals. The related documentation is part of the handover.
Maintenance
Scheduled preventive maintenance and corrective maintenance on call: periodic calibration checks, replacement of out-of-tolerance instruments, diagnosis of abnormal readings, restoration of failed loops.
Integration with the mechanical work.
This is why the service is in our catalogue instead of being subcontracted.
When mechanical installation and instrumentation are in the hands of two different contractors, the boundary between them becomes an interface to manage, and interfaces are where sites lose time. The instrument arrives when the line is not ready, or the line is ready but the process tapping has been placed where the instrument cannot be installed.
With a single accountable party, mechanical installation and instrument installation are planned in the same sequence. It is the difference between two crews waiting for each other and two crews working.
Scope of work.
- Mounting of pressure, temperature, level and flow transmitters
- Impulse lines, process tappings, vents and drains
- Consistency check against hook-up drawings and P&IDs
- Calibration with traceable standards, as-found and as-left records
- Point-to-point loop check up to the control system
- Verification of alarms, setpoints and trip logic
- Installation and tuning of positioners on control valves
- Installation in hazardous areas to the required protection method
- Scheduled preventive and on-call corrective maintenance
- As-built documentation updates
What you receive.
- Loop folder, complete, for every loop checked
- Calibration certificates with as-found and as-left values and traceability of the standards
- Loop check report with point-to-point results
- Hazardous area documentation
- As-built installation records updated against the hook-up drawings