Overview

Directions

• Directions - 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.
• Applications - 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.

The Science

• 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
  98.5%	99%	Year 1
  96.5%	98%	Year 2
  99.3%	99.9%	Year 3

• 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%).

Benefits

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.

Documents

• Zok Product Brochure
• MSDS