Vapor-mounted seal means a primary seal mounted so there is an annular vapor space underneath the seal. The annular vapor space is bounded by the bottom of the primary seal, the tank wall, the liquid surface and the floating roof.
Liquid-mounted seal means a primary seal mounted in continuous contact with the liquid between the tank wall and the floating roof around the circumference of the tank.
the seal means the common seal of the Company.
Beam axis means a line from the source through the centers of the x-ray fields.
Filter means material placed in the useful beam to preferentially absorb selected radiations.
Electronic seal means data in electronic form, which is attached to or logically associated with other data in electronic form to ensure the latter’s origin and integrity;
Filter profile means a graphical representation of individual filter performance, based on continuous turbidity measurements or total particle counts versus time for an entire filter run, from startup to backwash inclusively, that includes an assessment of filter performance while another filter is being backwashed.