The straight-side, eight-point gib-guided press features a 36" x 36" bed, 28" of daylight, an adjustable stroke of up to 12", distance and pressure reversal
, pressing speeds up to 23" per minute and a pre-slow down circuit to set height for changeover from rapid advance speed to pressing speed.
Patients were subsequently monitored and reassessed at 3-4 months (first follow-up), at 6-7 months (second follow-up) and at 9-10 months (third follow up) for blood pressure reversal
/ regression / resurgence.
1) The NTSB noted that research demonstrated that a spike test can identify certain defects that may not be revealed by a hydrotest alone, but which may fail when the pipeline is returned to service after the hydrotest through a phenomenon known as pressure reversal
Peer Pressure Reversal
, Chapter 2: "A Skill to Give a Child," by Sharon Scott
The phenomenon of pressure reversal
occurs when a defect survives a higher hydrostatic test pressure but fails at a lower pressure in a subsequent repressurization.