A rig that is not drilling and a vessel that cannot sail are the marine equivalents of an aircraft on ground, with the same arithmetic and often worse geography. The destination is frequently remote, the last leg is a boat or a helicopter, and the part is small.
01Certification matters as much as the part. Class societies and flag states want the material certificate, and a spare that arrives without one may not be fittable, which means the movement achieved nothing.
02Timing is often set by a sailing date or a weather window rather than a business day, which is why this sector calls at hours when most logistics providers are closed.