Browsing by Author "Carmody, Chris"

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    Dry Gas Seals: General (Installation, Operation, Troubleshooting, and Retrofitting), Controls
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2018) Asokan, S.P.; Srinivasan, R Sathya; Baldassarre, Leonardo; Bhat, Vasanth; Carmody, Chris; Doorenbox, Athal; Goebel, Daniel; Weegenhausen, Michael; Forsthoffer, Michael Sean; Forsthoffer, William Eugene; Woon Lip, Teo
    Suggested Topics for Dry Gas Seals Discussion group: • DGS operating characteristics • Unidirectional versus bidirectional • Seals faces and seats, O rings materials • Explosive decompression • Primary seal gas supply control system Primary seal failure detection • Primary seal gas vent to flare control system • Secondary seal failure detection • Tertiary seal types, carbon rings versus labyrinth • Buffer gas and associated control • Separation gas, air or nitrogen and associated controls • Tandem versus double seals application • Field problems and experiences • Challenges in Dry Gas Seal retrofits • Operation and spares maintenance, shelf life and requalification. • Dry Gas seals reliability and availability. • Dew point monitoring and control • Seal Gas Conditioning systems • Seal Gas Boosters and Heaters • API 614 – 5th Edition, current and advancements in Dry Gas seals & Systems
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    Explosive Decompression And Other O-Ring Related Issues For Turbomachinery Service- Some User Guidance
    (Turbomachinery Laboratories, Texas A&M Engineering Experiment Station, 2015) Carmody, Chris; Turbomachinery Symposium (44th : 2015)
    Flexible sealing elements, typically elastomeric O-rings are commonly used to contain fluids within pressurized cavities of turbomachinery at the interfaces between adjoining components. All too often the only selection criteria applied for these sealing element is chemical resistance and a check that the service conditions are within the published temperature limits for the material being considered. This seemingly simplistic selection process can be complicated when the fluid in question, comprised of numerous constituents that dictate several different elastomeric materials, would normally be the optimal selection. Furthermore in the case of duties where the fluid (typically gas) pressure is elevated, some additional considerations also become more prominent due to explosive decompression (ED) damage that can occur during rapid depressurization events in the pressurized system. Despite the effects of ED being well documented, there is still a relative lack of understanding regarding what makes a sealing device “ED resistant” and why. This tutorial goes through the composition of flexible sealing element materials and how they compare with a more widely understood engineering material; steel. It also focuses on sizing issues and international standards and how they are applied in given applications. Thermal considerations will also be addressed and an appreciation of the methods used to test such materials will be covered. In addition to ED topics being fully addressed there will also be other issues covered such as storage and longevity, modulus, strength, hardness, elongation, compression set, and stress relaxation. Lastly, although this tutorial focuses mainly on O-rings it can equally be applied to any elastomeric sealing material used in the turbomachinery industry.
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    Mechanical (Liquid) Seals: General (Installation, Operation, Troubleshooting, and Retrofitting)
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2018) Asokan, S.P.; Bhat, Vasanth; Carmody, Chris; Forsthoffer, Michael Sean; Forsthoffer, William Eugene; Lalithkumar, Seetharam; Morton, John; Necker, Nikolaus; Wu, Shifeng
    Mechanical seals are the most common method of sealing industrial centrifugal pumps and other rotary equipment. Although the basic concepts of a seals are simple, successfully using seals requires an understanding of the selection and operational requirements which can be unique for a specific application. In this discussion group, we will cover many of these considerations along with other application experiences from end users and seal OEMs. The discussion group will actively solicit topics from the attendees so the discussions will address real-world problems and challenges faced by the group. Suggested Topics for Mechanical Seals (Liquid) - Discussion group: Advancements in mechanical sealing – API 682 4th Edition Air testing of seals in pumps prior to installation • Challenges with low temperatures sealing • Effective leakage containment of single seals • The Selection and Design of Dual Pressurized Liquid Sealing Systems • Strengths and weaknesses in Plan 53A, 53B, and 53C piping plans Considerations when sealing abrasive slurries • How to apply dual pressurized gas seals • Mechanical seals for multiphase applications • Advances in seal face materials • Process for handling problem pump and seal applications • Definition of mean time between failure and industry best practices How and when to use split seals • Seal & System for rotating equipment other than pumps • Polymer and Elastomers sealing elements – reliability in Mechanical Seals