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Muitas gaxetas de PTFE e grafite estão disponíveis no mercado. Embora todas pareçam iguais, vale notar que existem inconsistências enormes na qualidade real do produto e no desempenho de muitas das soluções de gaxetas oferecidas.

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Understanding basic compression packing installation steps is key to getting the job done right, and will ensure outstanding packing performance.

Equipment made of glass-lined steel is used when manufacturing or processing aggressive chemicals such as aniline derivatives and strong acids such as sulfuric, nitric or hydrochloric acid. The Achilles heel of such glass-lined systems is the gaskets needed to seal the joints between components. Exposure to aggressive media causes the seals to degrade over time, resulting in damage to equipment and posing a health risk to operators. Replacing the seals costs a great deal of time and effort, with a corresponding drop in production output.

Equipment made of glass-lined steel is used when manufacturing or processing aggressive chemicals such as aniline derivatives and strong acids such as sulfuric, nitric or hydrochloric acid. The Achilles heel of such glass-lined systems is the gaskets needed to seal the joints between components. Exposure to aggressive media causes the seals to degrade over time, resulting in damage to equipment and posing a health risk to operators. Replacing the seals costs a great deal of time and effort, with a corresponding drop in production output.

The European Standard EN 13555, updated in the summer of 2014, defines the sealing gasket design factors and test methods for round flange connections. This allows the comparison of the properties of gaskets. Among other things, the standard establishes a new definition of the maximum surface pressure. What changes does this bring for the operators of plants and what criteria should be considered in the selection of gaskets using the characteristic as per EN 13555?

Compression packing has been around since the beginning of the industrial revolution and is still used extensively in types of equipment in which a stuffing box seal is required to prevent loss of process fluids to the environment. While advanced sealing solutions for rotary applications, such as mechanical seals, emerged over time, compression remains an important industrial tool. 

Technical article published in CPF June-July 2016

ePTFE gasket tapes for high chemical resistance - The connections to shell and tube heat exchangers pose immense challenges for the seals that are used because of both the chemically aggressive media and the frequent temperature load changes. Despite its excellent chemical resistance, polytetrafluoroethylene (PTFE) is not typically suitable as a sealing material in this case because the creep tendency of this material jeopardizes a reliable seal.

Technical article published in PROCESS Worldwide Magazine.

Korrosion, ungeeignete Materialien und Dichtungsversagen: Das sind wiederkehrende Probleme in der chemischen Industrie. Diese können durch den Einsatz von Dichtbändern aus expandiertem PTFE hervorragend gemeistert werden, beispielsweise bei der Abdichtung von Rohrbündelwärmetauschern, die durch chemisch aggressive Medien und häufige, große Temperaturlastwechsel enorme Herausforderungen an die eingesetzten Dichtungen stellen.

Beitrag aus CAV 10-2015 (www.prozesstechnik-online.de)

Zur Herstellung und Weiterverarbeitung aggressiver chemischer Stoffe wie Anilinderivate, Schwefel- oder Salzsäure kommen Apparate aus Stahl-Email zum Einsatz. Die notwendigen Dichtungen zwischen den Bauteilen sind dabei die Achillesferse. Aggressive Medien greifen diese an, wodurch sie undicht werden, die Anlagen beschädigen und eine große Gefahr für die Mitarbeiter darstellen. Der Austausch der Dichtungen erfordert viel Zeit und Aufwand – mit entsprechendem Produktionsausfall.