Dry Gas Seals Handbook by John Stahley

By John Stahley

Even though using dry fuel seals in procedure gasoline centrifugal compressors has elevated dramatically during the last two decades, the expertise is still misunderstood by means of many within the undefined. Dry fuel seals function with clearances measured in microns, less than the thickness of a human hair! whereas dry gasoline seals may be very complicated if now not accurately utilized on the time of plant, method, and/or compressor layout, the various winning installations are a testomony to how elementary those units may be whilst thoroughly utilized. enable writer John Stahley assist you take the secret out of dry fuel seals during this complete new book.

Dry fuel seals are in utilized in compressor stations, processing crops, refineries, chemical vegetation, and extra. This ebook is ideally fitted for:
• Engineers
• Operators
• upkeep personnel
• buying personnel
• Technical administration

the data present in Dry fuel Seals instruction manual can assist you're making proficient judgements concerning the software, operation, and upkeep of dry gasoline seals. This ebook provides an entire consultant to the know-how, from the primary of gasoline seal operation to "lessons realized" from genuine box experience.

Key beneficial properties & benefits:
• greater than 50 figures to demonstrate explanations
• Seven case experiences holiday down universal difficulties linked to dry gasoline seals, corrective activities, and classes learned
• Appendices offer ordinary examples of dry gasoline seal try out stories and dry fuel seal and barrier seal choice guidelines
• word list of universal phrases regarding dry gasoline seal expertise

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Extra resources for Dry Gas Seals Handbook

Example text

Labyrinth, shaft-contacting segmented carbon ring, and noncontacting segmented carbon ring) • Seal clearance • Separation gas supply pressure • Shaft diameter • Gas properties Assuming the last three factors are equal, we can evaluate the separation gas consumption of the three types of barrier seal designs. 25 inches and separation air supplied at 5 psig over secondary vent pressure, the contacting style segmented carbon ring barrier seals would have an expected operating leakage rate of approximately 1 SCFM.

In most cases, this will require a prefilter upstream of the customer connection point. Because double opposed gas seals normally use an inert gas such as plant nitrogen, which is generally quite clean and dry, seal gas quality is usually not an issue. Third, the potential for liquid condensation within the gas seal system must be thoroughly reviewed. Heavy hydrocarbons (C6 and heavier) and/or water vapor contained in the sealing gas have a tendency to condense as the gas flows through the gas seal system.

If the seal gas quality conforms to the requirements explained previously, liquid accumulation at the filters should be minimal during normal operation. It is common engineering practice to provide the duplex seal gas filter assembly with a differential pressure gage and a high differential pressure alarm to indicate when the filter element has become fouled and should be replaced. The filter manufacturer normally advises a differential pressure at which the filter element should be considered no longer useful and, therefore, replaced with a new element.

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