My reading: Not only must there be emergency cut-off switches, these must be some way away from the point where cargo is being sucked into the pumping system.

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cargo pump inlet via a filter. The pump is a Drum AD system hydraulically driven from the vehicle power takeoff arranged to maintain a constant delivery ...
www.nmo.bis.gov.uk/fileuploads/Docs/.../Cert_2798_Revision_...[PDF] Certificate - [ Traducir esta página ]
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A flexible “jumper” hose connects one compartment to the cargo pump inlet. The pump is a Drum AD system hydraulically driven from the vehicle power takeoff ...
www.nmo.bis.gov.uk/fileuploads/Docs/.../Cert_2797_Revision_... tanker cargo and ballast handling simulator - Resultado de la Búsqueda de libros de Google
International Maritime Organization - 2002 - Transportation - 76 páginas
... similar equivalent arrangement for maintaining a suction head at the cargo pump inlet - an eductor powered by cargo - a separate "stripping" line using ...
books.google.cl/books?isbn=9280141635...GB Patent 793013 - Improvements in or relating to oil tanker cargo ... - [ Traducir esta página ]
When the level of oil in the cargo tank 125 reaches a point at which gas must be extracted from the main cargo pump inlet connection to prevent a reduction ...
www.wikipatents.com/gb/0793013.html