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pinning margin

French translation: limite de colmatage des filtres par le catalyseur

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16:43 Jan 17, 2012

English to French translations [PRO]
Tech/Engineering - Petroleum Eng/Sci / raffinage

English term or phrase: pinning margin

Dans un descriptif de poste d'ingénieur des procédés (raffinage):

pinning margin, air demand coke, reformer yield calculations, etc. (phrase telle qu'elle est exprimée dans le document)

Merci

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French translation:limite de colmatage des filtres par le catalyseur

Explanation:
Il s'agit du risque de blocage (pinning, comme dans "to be pinned down" du catalyseur dans un réacteur de process) conduisant au colmatage des filtres du réacteur.

En anglais:
Pinning margin refers to the margin at which a moving bed catalyst will flow through a process reactor relative to hydrocarbon flow conditions that will otherwise cause the catalyst to suspend movement and effectively pin or stick to the reactor walls or center-pipe.

Available options to reduce pinning—the tendency of catalyst to stick to the screen due to radial thrust exerted by the vapors surrounding it—was to lower the regeneration gas flow. Installation of a restriction orifice on the regeneration-gas blower suction eliminated pinning and normal CCR platformer operations resumed.