Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)

304 Centrifugal Pumps: Design and Application
Standard Beds
Bedplates
Bedplate dimensions are dictated by ANSI specifications. Various
types are used in the chemical industry, namely structural channel, bent
plate, and castings. Bedplates are generally grouted for applications
above 25 horsepower. For certain applications, drain rim channels or cast
channels are offered.
Stilt-Mounted Beds
The stilt-mounted bed is a standard bed mounted on stilts 6 in. to 8 in.
above the surface. In this way they can be washed off to obtain clean
drainage in applications such as food and paper mills. The stilts should be
a minimum of 1 inch in diameter and made of a stainless material. On
some channel beds, in order to obtain secure footing (especially on a
rough surface), three stilts are used instead of four—ending up with a
milk stool type of construction.
Spring-Mounted Beds
This is a stilt-mounted bed with springs attached to the stilts that enable
the entire assembly of pump, motor, and bed to move when external
loads are applied to the nozzles. This is done in lieu of using piping expansion
joints and loops.
Noncorrosive Beds
Noncorrosive beds are used in a corrosive atmosphere where it is
known that steel beds will corrode in a short period of time. These beds
are offered in the same sizes of the ANSI beds. They are made by epoxy
coating steel beds or from nonmetallic. The nonmetallics are made from
a form using resin transfer molding or are made as a solid mass, the
thickness being that of the height of the bed. When grouting is required,
the grout hole is usually cut with a saber saw or hole saw.
FHnger
The flinger is installed on the shaft with a press fit in front of the support
head or cradle wall. The f linger is usually made out of elastomer or
polymer. Its function is to prevent excess packing or seal leakage from
entering into the bearing housing.