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Coker Drum – Skin Thermocouple

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This topic contains 1 reply, has 2 voices, and was last updated by  coker squirrel 15 years, 11 months ago.

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  • #4364

    Sangu Narayanan
    Participant

    Skin Thermocouple on Coker drum wall
    From: Sangu Narayanan
    Category: Safety
    Date: 29 Mar 2005

    Comments
    I am working on a new Coker unit coming up in Edmonton. On the coker drum wall, it is proposed to have a skin thermocouple. Please let me know if anybody has used this before. Will it improve the reliability with respect to determining if the coke drum has been quenched adequately and if there are no hot spots? Thanks Sangu

  • #7830

    coker squirrel
    Participant

    Drum skin temperatures alone are not the best indicators for determining whether or not a coke drum has been adequately quenched and cannot be used to determine if there are any hot spots. Drum skin temperatures can be used but there are better indicators for an adequately quenched drum. Some are: < 135°F Top outlet temperature, < 5 psig at the end of the quench and < 1 psig to remove the top head, total amount of quench water used should be consistent, the amount of sour water produced is a very good indicator, and the knowledge of any change in the coker feedstock. Some crude blends produce shot coke, which makes it very difficult to quench. Drum skin temperatures can be also used for other things. We use the bottom skin temperature (< 250°F) as an interlock for removing the bottom head.

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