Frequently Asked Questions

Answers to our most frequently asked questions about Dresser-Rand Enginuity® products, aftermarket services, and general questions.

HPFi® (High Pressure Fuel Injection)
How long can I expect my high pressure fuel valves to last? HPFi fuel valves last an average of 13,000 operating hours. Your results may vary depending on your specific application.

Are there replacement options other than replacing my entire valve? Yes. Dresser-Rand Enginuity® offers several options for bringing your system back to “like new” condition. Visit our Aftermarket Support page to find out more about our valve re manufacturing program.

Can I remove HPFi valves without disconnecting the electrical leads? Yes. However, Dresser-Rand Enginuity recommends that the valve and EHV be removed as a single unit for maintenance as the EHV armature is easily damaged resulting in additional costs of repair.

How do I know when a valve needs to be replaced? If you’ve noticed an increase in gas flow through the Gas Flow Indicator installed with your system it may be time to have one or more valves repaired or replaced. Individual valves needing replacement can be isolated using the techniques described in the HPFi Hydraulic manual.

What oil do I have to use in my HPFi hydraulic system? Only approved hydraulic oils (listed in the HPFi Hydraulic Manual) should be used to avoid damage to critical components throughout the system and fuel valves.

How often should I change the hydraulic oil in my HPFi system? Dresser-Rand Enginuity recommends changing the hydraulic oil annually. However, if the hydraulic oil becomes contaminated it should to be changed immediately to avoid damage.

Why does Dresser-Rand Enginuity use hydraulics to control its HPFi valves? Using hydraulics allows the injection event to be controlled in a very precise manner without extracting energy from the fuel itself. This results in better mixing, efficiency, and lower overall emissions with minimal trade offs in performance.

iBALANCE™ and iFLOW™ (Engine and Compressor Monitoring)

I’m getting an alarm that is keeping the unit from auto-balancing. What should I check to resolve it? Take a look at the HPFi, iBALANCE™, or iFLOW™ manuals. Each manual has a troubleshooting section which identifies the alarms and several possible causes for those alarms.

I don’t see any numbers coming across on my HMI. What could be wrong? Check to make sure that you don’t have any communications alarms. If the communications has been interrupted in any of the critical links, then the HMI would not have data to display. Check to make sure that the Wonderware communications driver is running.

I can’t communicate with the modules using iVIEW™. What should I do? Check to make sure that the software is set up with the correct Module address. If this is correct, run the COMMSCAN program to see if the modules have been incorrectly set to the wrong address.

All my iBALANCE or iFLOW numbers are 0, but the engine is running. What’s wrong? Check to make sure that the TDC signal is present to the modules. Also make sure that the polarity of the TDC signal is correct. It should move in a positive direction first then go negative as the TDC Pin goes by the probe.

I have gain alarms and Cold Compression Pressure errors and I have already verified that the sensor is calibrated correctly. What’s next? You may have plugging in the Kiene valve which is causing the pressure signal to be attenuated to the sensor. Check to see if the pressure curve of the offending cylinder has a pronounced blow down after TDC.

iFLEX™ (intelligent Flexible Control)

How does the iFLEX™ system interface with other systems? The system communicates using the standard Modbus® protocol allowing both Serial (RS-485/232) and Ethernet communications standards.

Is a lap-top or computer interface required to change set-points? No. The iFLEX™ system comes with a touch-screen display. Set-points can be accessed and changed via the display.

Is tunable information (such as the set-points) protected? Yes! There are varying levels of password protection which will only allow authorized personnel to access and modify information in the system.

We have had trouble operating the engine as we would like due to our fuel supply having a varying BTU content. Is this something the iFLEX system could help us with? Yes! We have used meters to supply BTU values of the fuel to the iFLEX system. Using this input, the system is capable of adjusting the air/fuel ratio as required.

Does the iFLEX system provide purely air/fuel ratio control? No. The iFLEX system has been created with a stackable architecture allowing it to be built to customer specification. In addition to air/fuel ratio control, it can provide complete engine control (including starting, stopping, speed, loading, safety shutdowns) as well as compressor control and monitoring.

Is the iFLEX system capable of allowing us to increase its functionality in the future? Yes! The system is fully expandable allowing I/O and additional capabilities (control, monitoring) to be added as required.

General Questions

Do you keep an inventory of all the items I will need in stock? We do our best to have a supply of the most common parts, but call us to check. We can typically get most parts to you within a few weeks, even if we don’t have them in stock.

If I send a part in for repair how long does it typically take to be completed? This will vary greatly depending on the item to be repaired but typically a repair is completed within 3-5 weeks, sooner if necessary but expedited charges may apply.

What information does Dresser-Rand Enginuity® need from me when sending in items for repair? Specific contact information, part number, serial number, reason for return, etc. can be found on the RMA form.

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