Telic Engineering / Controls / GE Mark VI and Mark VIe

GE Mark VI and Mark VIe. From terminal board to Trender.

Unit tripped, inspection due, or a start-up after an engine exchange? We troubleshoot, inspect, start up and commission GE Mark VI and Mark VIe on LM2500 and LM2500+G4 packages, offshore and onshore. The engine, its instruments and its protection are what we know inside out; the control system is where we read and prove them.

Request availability See the Mark VI/VIe jobs
GE Mark VIe: where we work on the system Front of a GE Mark VIe TMR control cabinet: terminal boards with field terminal blocks and the R, S and T I/O packs plugged onto them, three finned controllers R, S and T and three 16-port IONet switches, field wiring to a speed pickup and a servo valve, a ToolboxST laptop and an HMI, with six numbered points: trip history, I/O packs, speed and servos, controllers, IONet, HMI and operators. RSTTOOLBOXSTTERMINAL BOARDS 01TRIP HISTORYToolboxST, alarms, Trender 02I/O PACKSterminal boards, loops 03SPEED AND SERVOSpickups, valves, trips 04CONTROLLERSR, S and T, voting 05IONETswitches R, S, T 06HMI AND OPERATORSalarms, trends, logs
16
assignments since 2017
23+
units worked on
12
offshore
2025
latest job
Sheet 01

Where we work on a Mark VIe system

The six places where most of our work happens, numbered as in the drawing at the top of the page.

  1. 01Trip history and Trender. A trip or a failed start leaves its trace in the trip history, the diagnostic alarms and Trender in ToolboxST. We read that first, and only then go to the wiring and the parts.
  2. 02I/O packs and terminal boards. A reading you cannot trust costs more than a trip. Every pack sits on its terminal board with its own processor and network ports. Loop checks from the field device to the value in ToolboxST, and pack replacement with the checks that go with it.
  3. 03Speed and servos. Speed signals and fuel valves decide whether the unit starts and holds load. Speed pickups to the turbine and protection I/O, servo outputs to the fuel metering valves and variable geometry, and the overspeed trip tested through the protection system, not assumed.
  4. 04Controllers and voting. Redundancy only helps if it works when it is needed. Simplex, dual or TMR with controllers R, S and T. A TMR unit keeps running with one controller down, which also means a failed controller can go unnoticed. We check all three and the voting, before it turns into a second failure.
  5. 05IONet. Ethernet between the controllers and the I/O packs, with separate R, S and T networks and switches. Link faults and a dead switch show up as diagnostics long before they cause a trip, if someone reads them.
  6. 06HMI and operators. Alarms, trends and dynamic data recordings explained to operations, so the crew knows what happened and what to do next time.
Sheet 02

What we do

By engineers who have done it before. Every job comes with a short daily report and paperwork you can use.

Troubleshooting

Trips, failed starts, diagnostic alarms, I/O and network faults. Trip history and Trender first, then the wiring, then the parts.

4k and 8k inspections

The controls and instrumentation scope of 4k, 8k and annual inspections on Mark VI and Mark VIe units, including safety-critical instrumentation.

Start-up after an exchange

Engine or gas generator exchange: the checks before the first start, the start itself and the run-up to load.

Loop checks and calibration

Instrument loops, thermocouples, vibration and speed chains checked end to end, with calibration sheets you can file.

Commissioning

New Mark VIe packages and control upgrades: point-to-point checks after the panel work, functional tests, first start and load tests, within the outage window.

Control health checks

Controllers, voting, networks, power supplies and pack diagnostics on a running unit, written up so you know what to fix at the next outage.

Sheet 03

Platforms and software

What we have actually worked on. If your system is not on it, ask.

Platforms
GE Mark VI · Mark VIe · PAC Systems RX3i
Software
ToolboxST · Trender · Cimplicity HMI · Proficy Machine Edition (RX3i)
Around it
Bently Nevada 3300 and 3500 · EX2100 excitation · Woodward fuel metering valves
Engines
LM2500 and LM2500+G4, SAC and DLE · TM2500 (RX3i)
Where
Offshore: UK. Onshore: France, South Korea, Ghana, Italy.
In the track record
16 assignments, 2017–2025, about 23 units
Sheet 04

Mark VI and Mark VIe jobs

Taken from our track record, newest first.

PeriodWorkEquipmentSystemsLocation
Oct 20258k inspection, safety-critical instrumentation1× gas turbineLM2500+G4, Mark VIeOffshore UK
Feb–Apr 20254k inspection, engine exchange support, start-up1× gas turbineLM2500+G4, Mark VIOffshore UK
Oct 2024Troubleshooting1× gas turbineLM2500, Mark VIeFrance
Aug 20234k inspection, start-up1× gas turbineLM2500+G4, Mark VIOffshore UK
Jul 20238k inspection, safety-critical instrumentation, start-up1× gas turbineLM2500+G4, Mark VIOffshore UK
Jul 2022Control health check1× gas turbineLM2500+G4, Mark VIeOffshore UK
Nov 20214k instrumentation inspection1× gas turbineLM2500+G4, Mark VIOffshore UK
Feb–Apr 2021Commissioning fuel metering system, DLE2× gas turbinesLM2500 DLE, Flex500, Mark VIeSouth Korea
Sep–Oct 20204k inspection, instrumentation1× gas turbineLM2500+G4, Mark VIOffshore UK
Aug 2020Troubleshooting1× gas turbineLM2500+G4, Mark VIeOffshore UK
Earlier work6 assignments
PeriodWorkEquipmentSystemsLocation
Jun–Oct 2020Maintenance, operations support3× gas turbinesLM2500+G4, Mark VIOffshore UK
Jan–Apr 2020Commissioning5× gas turbinesTM2500, RX3iGhana
Jul–Aug 2019Field service1× gas turbineLM2500+G4, Mark VIOffshore UK
Jun 2019Field service1× gas turbineLM2500+G4, Mark VIOffshore UK
Oct–Nov 20188k inspection, start-up1× gas turbineLM2500+G4, Mark VIOffshore UK
Sep–Dec 2017Commissioning manager1× gas turbineLM2500, RX3iItaly
Sheet 05

Questions we get

Do you work for GE Vernova or for the operator?

Both. GE Vernova is one of the companies we are registered with as a supplier, and much of our Mark VI and Mark VIe work is for OEMs, packagers and service providers, as their field engineer. We also work directly for operators, alongside the OEM team where a service contract is in place.

Woodward or GE, does it matter for the job?

Less than people think. We are experts on Woodward and GE control systems, and on an LM2500 the engine, the instruments and the protection are the same whichever control runs them; the platform is where you read and prove them. Our track record has Mark VI and Mark VIe jobs every year from 2018 to 2025, next to the Woodward work.

Do you commission Mark VI to Mark VIe upgrades?

Yes. Point-to-point checks after the panel work, functional tests of every sequence and trip, first start and load test, planned so it fits the outage.

Do you supply parts?

Hard-to-find and obsolete control and instrumentation parts for Mark VI and Mark VIe packages, sourced through our supplier network, checked for compatibility, installed and tested on site.

How fast can you get an engineer to site?

Send the start date, location and scope and you get availability and an estimate the same working day. Offshore certificates (OPITO BOSIET/FOET, MIST, offshore medical) are kept current, so paperwork is not what holds you up.

Can you send more than one engineer?

Yes. For campaigns or several units at once we add contractors from our own network, under our agreement, our insurance and our reporting. How resource supply works.

Sheet 06

Read on

Mark VIe trip, outage or start-up coming up?

Send the start date, estimated duration, scope, systems on site and location. You get availability and an estimate the same working day.

Request availability

Question from purchasing or compliance? Company details, insurance, HSE and quality policies and procedures are on the Working with Telic page.

Remco Petersen
Telic Engineering B.V.
Markenplein 24, 1011 MV Amsterdam
The Netherlands
remco.petersen@telic-engineering.nl
+31 6 51345316
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