Hi Ed, I recall from my steam days that the near-perfect-vacuum condensers in our plant had special jack screws that could be spun up against reinforcing plates on the underside of the condenser to enable the box to carry the mass of the tons of water used to fill the condenser steam side for leak tests...but the OP provided virtually no info, hence the query.
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]