HEATING JACKETS

Heating Jackets are self-contained units which consist of inner and outer steel shells, a heating unit, a device which holds the reaction vessel in place, and a

thermocouple port

STANDARD CLOSURES

Compression Closure-Outside-cap Type (for Use on Micro, 4-3/8-In, Series Reaction Vessels)- Consists of five parts: (1) outside cap that screws onto the body of the reaction vessel; (2) thrust bolts; (3) hardened-steel thrust ring that keeps the thrust bolts from marring the pressure head; (4) inner pressure head; (5) gasket.  The cap has two holes for the insertion of a tommy bar for loosening, and has two tapped holes for eyebolts for use in lifting the vessel from the heating jacket.  Four vent holes in the cap provide relief of pressure in the event of gasket failure or leakage.
Gaskets are of two types: (1) a flat copper or other metal gasket that is set into a groove on the underside of the head; (2) a "delta" gasket.  Flat gaskets are used for most services up to 15,000 psi.; "delta" gaskets for extreme pressures.  As pressure in the vessel increases, the pressure acts on the inside of the "delta" and changes the angle of contact between the gasket and its seals.  This slight change in angle with rise in pressure tends to force the "delta" ring tightly against its seat and thereby insures a self-energized joint.

See also Notes on Temperature Control .