Gas Compression Magazine

April 2018

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Page 23 of 67

I ncreased demands on equipment in the energy industry has become a common subject, but that makes it no less true. For reciprocating compressors, high pressures and high WTIIHWEWVIUYMVIHJSVVI½RMRKSVIRLERGIHSMPVIGSZIV] processes, for example, are becoming the norm, and original equipment manufacturers (OEMs) are increasingly building to American Petroleum Institute (API) limits on piston rod linear speeds. These high pressures and speeds threaten the structural in- XIKVMX]WIEPMRKTIVJSVQERGIERHPSRKIZMX]SJGSQTVIWWSVTEGO- ing cases – risks that can be mitigated with the use of cooled packing cases. API 618, now in its 5th edition, requires a cooling W]WXIQJSVPYFVMGEXIHGEWIW[MXLRSRQIXEPPMGVMRKWXLEXLEZI EQE\MQYQEPPS[EFPI[SVOMRKTVIWWYVI1%;4EFSZI TWMFEVPYFVMGEXIHGEWIW[MXLER]VMRKQEXIVMEPXLEXLEZIE 1%;4EFSZITWMFEVERHEPPRSRPYFVMGEXIHGEWIW regardless of pressure. 1 Beyond the API requirement, cooled TEGOMRKGEWIWEVITVSZIRXSVIHYGIVSHXIQTIVEXYVIWEW[IPP as packing case temperatures, extending component life and MQTVSZMRKWIEPMRK Rod And Packing Cup Temperatures At 1200 rpm And 1750 psi (120 bar) Discharge Pressure Before And After The Introduction Of Coolant Into A Vortex Cooling Packing Case While the preponderance of compressors requiring cooled TEGOMRKGEWIWMWEVIPEXMZIP]VIGIRXTLIRSQIRSRSRIGSSPMRK W]WXIQWSPYXMSRMWGIPIFVEXMRKGPSWIXS]IEVWSRXLIQEVOIX MORE THAN TANGENTIAL BENEFITS Vortex Cooling packing cases, from Cook Compression, JIEXYVIXERKIRXMEPGSSPERXGLERRIPWXSTVSZMHILMKLP]IJJIGXMZI cooling in an API-compliant design. The tangential channels GVIEXIEWMRKPI¾S[TEXLJSVXLIGSSPERX8LIIRXMVIZSPYQI Continued on page 24 of coolant passes through a continuous path from inlet to SYXPIXQE\MQM^MRKGSSPERX¾S[ZIPSGMX]XLVSYKLSYXXLITEXL 8LMWLMKL¾S[ZIPSGMX]EMHIHF]XLIGLERRIPKISQIXV]GVIEXIW XYVFYPIRGIJSVLIEXVIQSZEP Computational Fluid Dynamics (CFD) Model Of Turbulent Flow In A Vortex Cooling Cup 8VEHMXMSREP GSSPIH TEGOMRK GEWI GSR½KYVEXMSRW MRGPYHMRK TVIWW½XERHTPEXIERHGLERRIPHIWMKRWYWIEGPSWIHPSSTTEXL XLEXGVIEXIWTEVEPPIPGSSPERX¾S[*VSQXLIMRPIXXLIGSSPERX in each cup follows two separate paths to the outlet, which VIHYGIWXLI¾S[ZIPSGMX]ERHHIGVIEWIWXLILIEXVIQSZEPIJ- ½GMIRG]:SVXI\'SSPMRKXIGLRSPSK][MXLMXWGSRXMRYSYW¾S[ LEWEGLMIZIHYTXS KVIEXIVIJ½GMIRG]EWGSQTEVIHXSE standard plate-and-channel design. The Vortex Cooling design also introduced single-piece con- struction for water-cooled cases, reducing the chance of leak- EKI4VIWW½XGYTWEVIZYPRIVEFPIXSHEQEKIHYVMRKEWWIQFP]EX the O-rings used to seal the coolant channel at the interface of the two cups. Plate-and-channel cups comprise two pieces as well, a plate and a cup, joined and sealed with two rod-en- circling O-rings. Again, the O-rings create potential for failure. )ZIR[MXLSYX3VMRKJEMPYVIXLIWIX[STMIGIHIWMKRWTVIWIRX potential gas-to-coolant leak paths, particularly at high pres- sures, where the two pieces are joined. Admission of gas can damage the cooling system and allow the escape of potentially hazardous gas from the compressor. In contrast, the single-piece cup of the Vortex Cooling de- sign eliminates potential failure points and has a natural leakage TEXLXLEX¾S[WSYX[EVHMRXSXLIFS\FSVIERHXLIHMWXERGI | APRIL 2018 22 COOLED PACKING CASES: WHERE TURBULENCE IS AN ADVANTAGE BY GAVON MANESH AND KRISTA BETTS

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