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Mahmod Samman

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  • in reply to: High thicknesses NDT Inspection #28142

    Mahmod Samman
    Keymaster

    If you need to inspect from the outside, most NDE methods would have significant difficulties. Your best bet is probably Acoustic Emission but be prepared for many false indications. For inside inspections, high definition video is useful sometimes but distinguishing between edges (weld passes and overlay-clad joints) and cracks can be very challenging. Internal ACFM can only detect surface breaking flaws and appears to be very susceptible to coke deposit errors. Internal laser scanning is necessary for measuring distortion (bulging) but cannot help with crack detection. Unfortunately, as of now, internal liquid penetrant and ultrasound testing, which require scaffolding, are the most reliable.

  • in reply to: Feed type with a slide valve, feedback request #25568

    Mahmod Samman
    Keymaster

    I am not aware of any industry surveys that provide details for comparing the various options. Single inlets are typically (not always) related to drum tilting, blow-outs, and uneven cooling. Dual-inlets have been installed on some drums for over 40 years with no problems. The key is to have it designed for the specific operating parameters of your drum (e.g. flow speed, angle, fluid properties, etc..). There is a fourth option you did not mention which is Chevron’s refractory-lined spool which I understand that Chevron has started to license to other companies. In selecting a system, I would emphasize performance history over simulations. Most CFD (computational fluid dynamics) models are grossly unrealistic because they do not capture multi-phase flow, rising fluid level, and process transformations. If you want me to get you in touch with Chevron about their spool, please email info(at)hes.us.com.

  • in reply to: Corrosion on Coke Drums #21826

    Mahmod Samman
    Keymaster

    I have seen photos of internal corrosion but not external corrosion of coke drums. You may want to try asking members of the Linked In group: Coke Drum Mechanical Integrity. Someone else may have seen it.

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