Goulds Pumps 3355 - IOM - Manual (Page 13)

Product Description
Part description
Casing
The pump consists of three pressure boundary parts:
• Suction casing - available in an end suction (ES) or radial suction (RS) configuration
The suction casing has 150 or 300 lb. flanges and the discharge casing has 300 or 600 lb.
flanges.
• Discharge casing
• Interstage casings - number is dependent on the number of stages
Diffusers
Multi−vane diffusers provide smooth pulsation−free operation and eliminate radial loads in
order to increase the life of the bearing. This pump uses a diffuser design that is not an integral
part of the interstage casing. Each diffuser is precision machined to perfectly match the
impeller hydraulics.
Impeller
The impeller is enclosed and keyed to the shaft. An inducer option is available for the end
suction arrangement.
Seal chamber
• The tapered bore seal chamber is self-venting and offers maximum cooling and flushing at
the seal face which increases the mechanical seal life.
• The standard seal arrangement features a single-balanced component seal on the
discharge end and a single-unbalanced component seal on the suction end of the RS
configuration.
• Internal flushing (Plan 01) is standard.
• External piping plans are not required.
Shaft
The shaft is sized to transmit the required power across all operating conditions of the pump.
Impeller keyways are staggered in order to maintain a rotational shaft balance.
Shaft sleeves
Renewable shaft sleeves protect the shaft in the seal chamber area which provides a longer
shaft life.
Bearings
• Bearings are grease lubricated.
• The thrust bearing consists of:
• A double-row thrust bearing for pump sizes 1.5 x 2.5−7 and 2.5 x 4−8
• Two angular contact ball bearings for pump sizes 4 x 5−10 and 5 x 6−11
These thrust bearing configurations provide bi-directional load-carrying capability.
• The RS configuration uses a grease-lubricated radial ball bearing.
• The ES configuration uses a product−lubricated radial bearing located between the first
and second stages.
Baseplate
The pump and motor are mounted on a common baseplate. The rigid, fabricated steel design
reduces vibration and helps to maintain the positive alignment of the pump and motor.
Couplings
The standard baseplate design facilitates non−spacer couplings.
Model 3355 Installation, Operation, and Maintenance Manual 11