Reactor stud hole plug unit

A reactor stud hole plug unit comprising:

• A. a compression plate having an outer surface, an inner surface, a peripheral edge, a central opening therethrough and an annular rim extending from the inward surface and spaced inward of the peripheral edge, said peripheral edge defining a lip adapted to rest on a reactor surface about an opening to be closed with said rim extending into said opening;
• B. a mandrel having a central threaded stud extending outward therefrom through the compression plate central opening, said mandrel plate having a cylindrical upper section dimensioned to fit within said annular rim, a cylindrical lower section of larger diameter than the upper section and a frustoconical section connecting the upper and lower sections;
• C. an elastomeric seal ring having a rectangular cross section and dimensioned to snugly fit about the cylindrical upper section of the mandrel plate and engage the compression plate rim in aligned relationship;
• and
• D. a nut threadably engaging the stud so as to maintain the unit in assembled relationship and upon turning adapted to draw the mandrel plate toward the compression plate between a noncompressed state where the compression plate is spaced from the mandrel and a compressed state where the seal ring substantially fills a space defined by the annular rim, the mandrel and a wall of the opening being plugged.