Centrifugal Pumps
Centrifugal Pump Installation Consideration
Figure 11-14 shows a typical mechanical flowsheet for two centrifugal pumps installed in parallel. It is presented to illustrate some of the considerations necessary for a good pump installation. Every installation has different objectives and very few will be exactly like this one.
The suction piping is sized for about 2-3 ft/sec and the discharge piping [...]
Wear Rings
These are easily renewable leakage seals between the impeller or shaft and casing designed to prevent leakage from high pressure to low pressure areas. They require a difference in hardness to avoid galling, and in sandy service a flushing fluid for cleaning.
12Sep2009 | admin | Comments Off | ContinuedSeals
Seals are necessary to prevent leakage at the point where the shaft enters the pump case. The most inexpensive seal is made of packing material that acts as a pressure breakdown device. Packing must be flexible and capable of being compressed for proper operation. Packing material may be made of flexible metallic strands with graphite [...]
11Sep2009 | admin | 1 comment | ContinuedBearings
Ball bearings transmit a load from a rotating surface to a fixed surface via a series of rotating balls. They are generally inexpensive, do not require any separate lubrication system, and can be designed to be selfaligning. However, they have limited ability to handle thrust, high loads, or high speeds.
Roller bearings transmit load from a [...]
Centrifugal Submersible Pump
Description
Mounting = Vertical
Casing split = Radial
Impeller type = Radial
Mounting feet = Mounting plate
No. of stages = Multiple
Applications
Flow conditions: High head and moderate flow rate, low NPSH available
Service rating: Critical
Typical uses:
1. Firewater pump offshore
2. Downhole in well
Centrifugal API Vertical Turbine or Can Pump
Description
Mounting = Vertical
Casing split = Radial
Impeller type = Mixed or radial
Mounting feet = Mounting plate
No. of stages = Multiple
Applications
Flow conditions: High head and high flow rate, low NPSH available
Service rating: Critical
Typical uses:
1. Firewater pump offshore
2. Pipeline pump
Centrifugal Sump Pump
Description
Mounting = Vertical
Casing split = Radial
Impeller type = Radial
Mounting feet = Mounting plate
No. of stages = Single
Applications
Flow conditions: Low head and moderate flow rate
Service rating: Non-critical
Typical uses: Primarily used to pump water or hydrocarbons
from shallow pits or compartments