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duce horizontal single and dual seals. These seals can be used for shaft diameters up to
220 mm and can be operated at high pv (p ~ 800 unloaded, pv ~ 65 loaded) and high process
fluid temperature. Axial seals are compact and feature a high degree of preassembly. For
example, seals produced by Pacific for 220 mm diameter shafts are about 300 m~ high and 450
mm in diameter. These seals can be supplied with covers and roller bearing that are installed
in an auxiliary cooled compartment.
Pacific has developed a drive stand design that permits seal replacement without disman-
tling the stand by using a transition bushing and an adjustable shaft. These stands are used
in glassed vessel.
Lubricating grooves on the contact surfaces and intensive cooling of the seal, lower
section of the housing, and the roller bearing result in high efficiency of axial double me-
chanical seals produced by Burgmann (see Fig. 2). These seals can be used at high pressure
and sliding speeds due to the presence of grooves on the fretting surface of seal rings.
Seals with contact surface grooves are called thermohydrodynamic.
Rubber O-rings, covered with a Teflon film, are used by Pacific and Burgmann as sealing
elements for operation in chemically corrosive fluids. These rings are installed on the pro-
cess fluid side. Thermal destruction of the rubber O-rings is prevented by intensive cooling Fig. i. Axial double mechanical seals (Pacific) for
top-entry agitator shafts: a) unbalanced with a built-
in bearing (type 500); b) balanced, cooled housing and
no bearing (type 535); i, 2) inlet and outlet of seal-
ing fluid, respectively; 3) lubricant inlet and outlet;
4) drain for sealing fluid and product leakage; 5, 6)
coolant inlet and outlet, respectively. Fig. 2. Axial double mechanical seals (Burg'mann) for
top-entering agitator shafts: a) unbalanced, no bear-
ing (type HS-D); b) unbalanced complete with a bearing
and cooled lower part of the housing (type HSL-D); 1,
2) inlet and outlet of the sealing liquid; 3) lubri-
cant inlet; 4) sealing ring with segmental grooves on