Archive for the ‘Surface Pump’ Category
Wednesday, May 6th, 2009
Figure 6. Combined Curves
Figure 7 shows a typical Centrifugal Pump and efficiency curve for operation
at a fixed speed. It can be seen that for fixed speed operation,
the efficiency varies as flow is adjusted. For adjustable speed
operation however, the affinity laws predict that the Centrifugal Pump curve
will shift downwards for reduced ...
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Monday, April 27th, 2009
These characteristics are important when one considers a typical
duty cycle for a Centrifugal Pump application. A typical operating cycle
might be represented by the bar chart shown in figure 3.
Centrifugal pumps are generally sized to handle the peak flow
requirements, which typically occur for very short periods of time.
Consequently, the equipment would ...
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Tuesday, April 21st, 2009
Foreword
This article is a revised edition of the original D-7108 application
note as written by Dennis P. Connors, John D. Robechek, and
Dennis A. Jarc. Centrifugal Pumps The overall content and principles of this 1982
publication are still very much valid and relevant today. The significant
changes that have occurred since this article was ...
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Monday, April 13th, 2009
Centrifugal Pumps Electronic Motor Overload Protection
The SMC-3 controller incorporates, as standard, electronic motor
overload protection. This motor overload protection is accomplished
electronically with the use of current transformers on each of the
three phases. Centrifugal Pumps The controller’s overload protection is programmable,
providing the user with flexibility. The overload trip class selection
consists of either OFF, ...
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Friday, April 3rd, 2009
Centrifugal Pump Electronic Motor Overload Protection
The SMC Flex controller incorporates, as standard, electronic motor
overload protection. This overload protection is accomplished
electronically with an I2t algorithm.
When coordinated with the proper short circuit protection, overload
protection is intended to protect the motor, motor controller, Centrifugal Pump and
power wiring against overheating caused by excessive overcurrent.
The SMC ...
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Tuesday, March 31st, 2009
Centrifugal Pump Control - Start and Stop
This option is used to reduce surges during the starting and stopping of a Centrifugal Pump by smoothly accelerating and decelerating the motor. The microprocessor analyzes the motor variables and generates commands which control the motor and reduce the possibility of surges occurring in ...
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Sunday, March 29th, 2009
Centrifugal Pumps ,The SMC Flex controller provides the following modes of operation as Standard:
Soft Start
This method covers the most general applications. The motor is
given an initial torque setting, which is user adjustable. From the
initial torque level, the output voltage to the motor is steplessly
increased during the acceleration ramp time, which ...
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Friday, March 27th, 2009
Centrifugal Pumps Operating Limits:
-Max.suction head:8m
-Max.liquid temperature:60°C
-Max.environment temperature:40°C
-Continuous duty
Centrifugal Pumps Motor:
-Two-Pole induction motor(n=2900r.p.m.)
-Insulation Class B/F
-Protection IP44
Centrifugal Pumps Material:
-Pump body: Cast Iron
-Impeller: Brass
-Motor Shaft: Hi-Cr plated 45# Steel/2Cr13# Stainless Steel/S.S#304 Welding shaft
-Mechanical seal: Ceramic/Graphite
Centrifugal Pumps Application:
·Centrifugal Pumps single impeller low head water pumps for flow irrigation systems with flow rates.
·Suitable to pump ...
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Tuesday, March 24th, 2009
V. Centrifugal Pump Report
A formal written report is not required for this experiment. You are responsible for the plots, table,
and the discussion questions listed below. Your responses to the discussion questions are to be typed
with 1-1/2 to double spacing, using a character font no smaller than 12 point on 8 ...
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Sunday, March 22nd, 2009
Centrifugal Pumps Experimental Procedure
In this lab, you will be collecting flowrate, pressure, temperature, torque, and Centrifugal Pump speed data so that you can prepare pump characterization plots, similar to Figure 7. Two different impellers will be
tested, a forward facing or reverse impeller and a backward facing or normal impeller, as ...
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