SwRI will be exhibiting at the GMRC Annual Gas Machinery Conference Virtual Event.
Monday, Oct. 5
1:15 p.m.-2:00 p.m.
"A Method and Apparatus for Direct Enthalpy Rise Measurement for Gas Compression, Phase 3," Brandon Ridens
Equations of State are used to determine the performance of compressors and pipeline hydraulics. These are semi-empirical models that calculate various thermodynamic and physical properties of gas mixtures for known pressures and temperatures. Isentropic enthalpy head is a critical thermodynamic parameter that is required to accurately design and performance test compressors. A novel method and test apparatus was developed to measure enthalpy rise directly using a calibrated, near isentropic compression process. This presentation will discuss the modifications to this test apparatus required for measuring hydrocarbon mixtures that include corrosive gas and water vapor, the measurement methodology, and test results.
3:15 p.m.-4:00 p.m.
"Dry Gas Seal Reliability: A Study of the Effects of Liquid Contamination on Seal Performance, Phase 2-3," Aaron Rimpel
Liquid contamination in dry gas seals (DGS) can come from a variety of sources and cause DGS failure. The physical effect of liquids on DGS performance is a topic of limited understanding, and conflicting theories exist regarding liquid-induced failure mechanisms. This presentation will discuss ongoing experimental and analytical efforts seeking to develop an understanding of liquid contamination effects to improve DGS system design, instrumentation, and monitoring to improve DGS reliability; also, to develop a methodology to predict DGS failures based on general geometry, operating conditions, and gas/liquid compositions and concentrations.
Tuesday, Oct. 6
2:15 p.m.-3:00 p.m.
"Dew Point Measurement Research," Sarah Simons
This project is a summary of the research work funded by the Gas Machinery Council to create a variety of gas mixtures with atypical components and obtain the dew point of each mixture at a certain pressure using two different methods for comparison purposes. The first method to obtain the dew point of a mixture is the standard procedure used by pipeline operators: take samples of the gas mixtures and have the components independently identified by three different laboratories using gas chromatography or gravimetric analysis. The dew point at the range of operating pressures is then calculated through a software program for that gas mixture using an equation of state. The second method is an actual measurement of the dew point through the use of a chilled mirror device. A summary of the results are presented for comparison purposes in this paper to form a better understanding of the limitations and capabilities of gas sample analyses.
"Development of a Robust Scrubber Level Controller – Part 2," Carolyn Day
This presentation summarizes the first two completed phases of a project investigating scrubber level controllers and the phase that is currently in progress. The presentation covers failure analysis of level controllers used in the field, development of a new level sensor technology, testing at various conditions of several commercial level sensors/controllers and the new level sensor developed by SwRI, analysis of results, and the status of the current phase of the project.
Wednesday, Oct. 7
9:00 a.m.-10:30 a.m.
"Transient Flow Modeling for Gas Compressor Systems," Adrian Alvarado, Kelsi Katcher
Hydraulic modeling is a useful tool to analyze transient scenarios that are likely to be encountered that pose high risk to an equipment’s integrity (such as compressor surge) or station operating condition commitments (such as gas standard flow delivery or maintaining power generation equipment supply pressures). Transient hydraulic modeling provides the mathematical and physics dependent transient event reactions to analyze the system response (pressure, temperature, flow rates, etc.) to said event. In this presentation, we will discuss the basic inputs of for modeling a compressor station, modeling methodology, the capabilities of the simulation controls, and analyze some case studies.
2:15 p.m.-3:00 p.m.
"Testing Variable Orifices For Optimization of Reciprocating Compressor Pulsation Control and Performance," Jordan Nielson
Methane emissions from reciprocating compressors is estimated to be 72.4 Bcf per year in the United States according to a 2006 statement by the United States Environmental Protection Agency. Methane also has a global warming potential 50 times greater than carbon monoxide. Reciprocating compressors are the machinery type with the highest contribution to methane emissions at natural gas transmissions stations. The largest contributing factor comes from the sealing components in the packing components around the piston rod. SwRI designed and set up a test loop to perform baseline packing leakage measurements on a four stage 700 HP JGT/4 compressor. The goal was to improve upon current packing leakage models and to compare new seals vs. used seals.
Thursday, Oct. 8
3:15 p.m.-4:00 p.m.
"Testing Rod Seal Leakage of a 700 HP Reciprocating Compressor," Jordan Nielson
There are many challenges to removing pulsations from reciprocating compressor systems to allow for a wide operation of pressures and flow conditions. Reciprocating compressors commonly utilize pulsation bottles and fixed orifices to reduce pulsation amplitudes. However, restrictive fixed orifices may impose large performance penalties, and the orifices may not be necessary at all operating conditions or compressor speeds. The current study investigates the use of dynamic variable orifices (DVOs) on the third stage of a 700 HP JGT/4 reciprocating compressor to evaluate and quantify how changing the effective orifice size can reduce the pressure pulsations in a reciprocating system. A DVOTM, which can be adjusted to different effective flow areas while the compressor system is operating, was installed at the cylinder nozzle and another at the line nozzle connection of the third-stage suction bottle. High speed pressure measurements were taken in the third-stage cylinder and in the piping between the second-stage discharge and the third-stage suction. The testing compares the pressure pulsations with orifice beta ratios varied from 0.4 to 0.9. The addition of the orifices showed significant reduction in the peak‑to‑peak pulsations, with the largest reduction occurring in the interstage piping between the second and third stages.
Tuesday, Oct. 13
1:00 p.m.-4:00 p.m.
"Advanced Topics in Acoustics and Vibration," Buddy Broerman, Sarah Simons, Ben White
This short course will cover advanced topics in pulsations and acoustics in piping systems that are beyond the scope of introductory level short courses. Topics in this short course include equations of state, wet gas compression and pulsation bottle design with liquid carryover from suction separators, valve noise and vibration problems; high frequency pulsation and vibrations from blade pass excitation, valves or instrumentation in centrifugal compressor systems; alternate methods of pulsation control for high pressure systems, advanced pulsation attenuation devices, pump pulsation mitigation, mixed compression, AIV, screw piles, and the impact of changing gas compositions for reverse direction flow on pulsations and horsepower requirements. Each topic will be presented with an overview of the topic, at least one case study and mitigation techniques or analysis methodologies.
For more information, please contact Ben White.