Learning Center


Enalysis Tip 1.12 - Reciprocating Compressor Trip and Control Settings

June 4, 2020
This Enalysis Tip details Detechtion Technologies’ recommended procedure for determining the shutdown, alarm and control settings for a reciprocating compressor. Compressor safety shutdown systems consist of pressure, temperature and vibration sensors combined with a set of annunciators and switches. Alarm and shutdown triggers are applied to critical sensors to prevent operating under any conditions that would exceed compressor rated limits. Alarms provide a warning to an operator that a limit is being approached, while triggering a shutdown will immediately cease the operation of the compressor. Therefore, it is essential that each shutdown is set such that the compressor is always protected, while still allowing a sufficient operating range so as not to limit gas production. 
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Enalysis Tip 1.11 - Reciprocating Compressor Safety Shutdown Systems

June 4, 2020
Changes in operating conditions, such as discharge pressure, flow rate, inlet suction temperature or ambient air temperature, will result in a variations of compressor performance. When the changes are substantial, the mechanical limits of one set of operating conditions may infringe on the normal expected parameters under alternative operating conditions. Therefore, compressors require a safety system designed to shutdown the compressor prior to the breach of any design limit.
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Enalysis Tip 1.10 - Reciprocating Compressor Limitations

June 1, 2020
Reciprocating compressor packages are restricted to operating under conditions that ensure the mechanical ratings of the compressor are not exceeded. Exceeding one or more limits of the compressor can result in catastrophic failures requiring expensive repairs and resulting in costly downtime.
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Enalysis Tip 1.9 - Compressor Field Data Entry with Fieldlink®

May 25, 2020
Did you know that all Enalysis users can use Fieldlink to enter compressor field data into Enalysis? Fieldlink eliminates the need for any paper data collection or manual data input. Simply input all compressor field data into the app and Fieldlink will automatically upload the data to generate an Enalysis report. Fieldlink can be used as part of your daily routines or for occasional troubleshooting.
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Enalysis Tip 1.8 - Troubleshooting Blowby and Gauge Maintenance

May 19, 2020
This post will provide Detechtion Technologies’ recommended steps for troubleshooting Blowby and “Gauge Maintenance”. These two concepts, along with their possible causes, were discussed in detail in E-Tips 1.3 - 1.7.
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Enalysis Tip 1.7 - Gauge Maintenance Result for Gas Compressor on Enalysis Report

May 19, 2020
“Gauge Maintenance” is the term used by Detechtion Technologies when the monitored compressor parameters are thermodynamically impossible according to the Enalysis software model. This occurs when the calculated expected discharge temperature is greater than the actual measured discharge temperature for a cylinder.
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Enalysis Tip 1.6 - Causes of Blowby: Valve Springing and Lube Rates in Gas Compression Equipment

May 7, 2020
Blowby can result without any physical damage to wear components or unaccounted pressure drops. Improper valve springing can lead to valve flutter, allowing gas to recirculate each compression cycle. Alternatively, high rates of lubrication can lead to oil coating the valve plate and seat, which leads to an increase in pressure differential required to break the stiction when the two surfaces separate. Both are examples of inefficiencies in the compression process and can cause Blowby to flag on an Enalysis report.
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Enalysis Tip 1.5 - Causes of Blowby: Unaccounted Pressure Drops in Gas Compression Equipment

May 7, 2020
This post will look at how unaccounted pressure drops effect the Blowby calculated in an Enalysis report from Detechtion Technologies. Enalysis requires a suction and discharge pressure and temperature for each cylinder in order to calculate the thermodynamic performance of that cylinder. While suction temperature, suction pressure and discharge pressure can be common for all cylinders on a compression stage, the discharge temperature must be unique to each cylinder. The location of each these values is important when it comes to understanding and troubleshooting Blowby on an Enalysis report.
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Enalysis Tip 1.4 - Causes of Blowby in Compressor Enalysis Reports: Damaged Cylinder Wear Components

May 4, 2020
As mentioned in the last E-Tip, “Blowby” is a term used by Detechtion Technologies to quantify inefficiencies in the compression process. Blowby is an indication of the health and efficiency of the valves and piston rings inside every cylinder. In short, it is a measure of the number of molecules of gas that are being re-circulated and recompressed within a cylinder. As more gas is re-circulated and recompressed, the temperature rise across the cylinder increases, more horsepower is required and the cylinder’s capacity to compress gas decreases. There are several things that can result in Blowby to flag on an Enalysis report. This article focuses on the effect of damaged cylinder wear components. While the most common culprits are valves and piston rings, this also includes piston rod packing, VVCP seals, valve gaskets, etc. Essentially, any component that is meant to prevent the passage of gas under normal working conditions, could lead to Blowby when it becomes damaged.
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Enalysis Tip 1.3 - Detechtion Blowby and Cylinder Health

May 4, 2020
More than two thirds of the unplanned downtime of reciprocating compressors can be attributed to issues with the wearing components in a cylinder. Early identification of these issues combined with a reliable quantification of the level risk and impact on production and/or power consumption allows for proactive scheduling of maintenance. This may mean stretching out the runtime despite rising discharge temperatures in order to align the work with a prescheduled maintenance interval or changing out components earlier to avoid future unscheduled downtime oil field assets.
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