ZOK 27 is a powerful water-based gas turbine compressor cleaner and corrosion inhibitor. Originally developed for the UK Ministry of Defence over 40 years ago, ZOK 27 is used all over the world today within the Aviation, Marine, Power Generation, Oil and Gas and Industrial sectors.
Regular on-line and off-line washing with ZOK 27 produces outstanding results in gas turbine engine performance: reducing fuel consumption, exhaust gas temperatures and emissions, while simultaneously increasing power recovery and the overall lifespan of engine components – ultimately maximising the ROI on your gas turbine.
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How does ZOK 27 optimise Gas Turbine Compressor performance?
A regular on-line and off-line washing schedule is essential to operate any gas turbine at its peak performance.
A major source of power loss for gas turbines is airborne contaminants, fouling the compressor and Inlet Guide Vanes (IGVs). These foreign contaminants reduce the efficiency of the compressor blades and IGVs.
Regular scheduled compressor washing with ZOK 27 provides:
- A reduction in unplanned downtime
- A reduction in exhaust gas temperature
- Power recovery
- An increase in fuel efficiency
- A reduction in harmful emissions
- An increase in the overall lifespan of engine components.
Turbine Aging Analysis Graph
RED LINE – Demonstrates the natural aging line or drop in performance of a GT compressor over time.
YELLOW CURVE – Shows the speedy loss in overall GT compressor performance when no on-line or off-line washing is conducted.
BLACK LINE – Illustrates the potent advantage of implementing on-line washing.
GREEN LINE – Highlights the sharp recovery in compressor performance with off-line washing.
As can be clearly seen, GT compressor performance is returned to near optimum levels when on-line and off-line washing is employed as part of your regular maintenance schedule.
Mix 1 part ZOK 27 with 4 parts water before use (20% solution). For on-line cleaning, use demineralised water (<11μS/cm conductivity).
For off-line cleaning, drinking water may be used (<700μS/cm conductivity). Consult your engine’s operations manual for specific instructions.
ZOK 27 is suitable for both on-line and off-line compressor cleaning. An efficient clean can be achieved even during the very short dwell times of a hot wash. The corrosion inhibitor allows engines to be left ready for instant restart, even in salty offshore conditions. Water rinse and dry out runs are not necessary unless recommended by the engine manufacturer. The concentrate is easily diluted for use in the Aircraft, Marine, Oil and Gas, Industrial and Power Generation Industries.
Case Study – Over 99% availability with ZOK
A combined cycle power station operated by Sithe Sterling Energy in upstate New York was responsible for providing electricity to a nearby Oneida manufacturing plant.
With an integrated fitout of a GE Frame 6B gas turbine compressor engine, Zurn HRSG and extraction steam turbine, Sithe estimated that to successfully meet their supply demands they would need to maintain an availability rate of 95.9% and reliability factor of 97.0% of their gas turbine compressor engines.
Thanks to a regular cleaning program using ZOK, their actual results were significantly higher.
|Actual Availability Rate
||Actual Reliability Factor
The Power of Preventative Maintenance
Sithe attributed this success to a consistent routine of washing their gas turbine compressor engine to ensure peak performance. An on-line water wash was performed each day the engine was in operation, with ZOK 27 detergent used on alternate days. For on-line hot washes, ZOK would be used for the first 3 minutes of the water wash, followed by a 17 minute rinse. In addition to daily hot washes, Sithe performed a quarterly off-line cold wash with ZOK.
The balance of consistent on-line and off-line washes is the key to success. Sithe experienced this first hand during a period when they ran their gas turbine compressor engine for 201 consecutive days without an off-line wash. Their calculations showed that the gas turbine output had fallen by 5.6% and the heat rate by 2.4%. Following an off-line wash with ZOK 27, the engine’s performance was restored to its original levels.
Thanks to Sithe’s consistent routine of on-line and off-line washing with ZOK 27, readings between quarterly off-line cleans showed only a minimal reduction of output performance (0.4%) and minimal heat rate increases (0.3%).
OEM & Industry Approvals
ZOK is approved by Major Gas Turbine Original Equipment Manufactures (OEMs), including General Electric, Alstom, Siemens, Solar Turbines, Pratt & Whitney, Rolls-Royce, Kawasaki, Mitsubishi:
Additionally, ZOK 27 complies with the following specifications:
- Alstom Gas Turbines
- General Electric GEK 103623 & MID-TD-0000-5
- Rolls-Royce MSRR 9914
- Solar ES9-62-1 On-Crank & Off-Line
- US MIL-PRF-85704C Type 11 Off-Line
- UK Defence Standard 79-18
Safety Data Sheet (SDS)
Download the ZOK 27 Safety Data Sheet here.