Pump

Presented by John Salyers

Territory Manager for seepex, Inc.

Company

Pumping Principals

Progressive Cavity Pump

Rotor turning within the Stator

Cavitiy always retains the same shape and

volume

Flow is a proportional relationship to speed/RPM

Constant, Pulsation-free flow because of

overlapping fluid chambers

Cavities

Just imagine a piston.

Imagine multiple pistons behind each other.

Now well make the wall thickness zero.

And change the piston slightly.

Youve created the endless piston PC pump!

How it works!

The unique design of a progressive cavity pumps offers users several advantages over other positive displacement pumps. This is due to the

simple principle of the pumping element which employs a metal rotor and

a rubber stator.

Flow control vs. Diaphragm Metering Pumps

Virtually no pulsations

You do not have to use pulsation dampeners with progressive cavity pumps. You do not have to dampen flow meters to sample over time. Because of the very low pulsations in a flow meters can read in real time.

What type of PD flow do

you want entering your

flow meter?

Operating Principle

Continuous flow makes PCs ideal for

multiple component blending.

Blending

Polymer Systems

Post dilution

Blending

Polymer Systems

No pulsations to head box when pumping retention aids!!!!

Blending

Hypo Systems

Gassing is not an issue


No ball checks means no back pressure valves!

No back pressure valves required!

PC pumps are better for higher viscosities where ball checks usually gum up and clog. NO vapor locking on products that gas (bleach).

Valveless Flow Control Cost of Ownership - Operational

Operational Costs

A progressive cavity pump control loop is simple! Pump, VFD, Flow meter

VFDs take the place of pneumatic controllers. Pump speed controls the flow. Response time is immediate!

Hysteresis is dramatically reduced..virtually eliminated!


Operational Costs

And remember that flat line from the flow chart indicates that you are getting more precise dosing and mixing, resulting in better quality control.

This may lead you to consider other options like eliminating batch mixing in blend tanks and going with more cost effective continuous, on-line blending.

Multiple component inline blending is a popular application for PC pumps because multiple components can be precisely metered continuously, without slip, and without

pulsations.

Shown: a multiple component, continuous and in-line blending skid.


Other Key Benefits to PC pumps

has low shear characteristics/requires gentle handling solids are not an issue accurate metering with minimum pulsation wide temperature range (especially with even wall stators) materials for abrasive or corrosive fluids


Benefits of compression vs. clearance

slip becomes less of an issue changing viscosities are not an issue: from easily flow able to highly viscous/paste like not affected by changing pressures! the compression enables the pump to act like a valve. When its stopped, nothing will flow

through it. When its running, displacement can be controlled by RPM.

self priming is another unique feature. Some centrifugal can lose prime between batches, or from alternating pumps.

.020

Valveless Flow Control Vertical Mount

The compression between the rotor and stator enables customers to mount the pumps vertically.

Saves valuable floor space at your facility.

Valveless Flow Control Vertical Mount - Solids

Non suspended solids in slurries wont settle in the pump casing and cause wear issues when pumps are mounted vertically. The pump works with

gravity by allowing settled solids to drop into the cavity.

MDs with integrated AC drive BN tank mounted CS food grade pumps

Advantages and Characteristics:

short, compact design with directly flange-mounted drive

(wobble pumps in block design)

extremely low shear

flexible stator without steel cladding, fixed on one side

rotating unit with only one joint

rapid replacement of the conveying elements due to simple

pump structure

delivery of fluids of all viscosities, even with a high

percentage of solids

special advantages are their efficiency and trouble-free

(simple) handling

conveying capacities: up to 10.6 USGPM

pressures: up to 60 PSI

Polymer Pumps > Product Group BW



(block design)

extremely low shear

housing optionally in stainless steel or plastic

conveying capacities: 0.053 - 264 GPH


Polymer Pumps > Range MD



(block design)

extremely low shear

cost-efficient, since drive casing, elastic coupling and

common baseplate are omitted

service-friendly due to plug-in connections between rotating

unit and drive

separate pump bearing is not necessary

conveying capacities: 0.132 USGPM - 2,200 USGPM


Polymer Pumps > Range BN

Products > Review > Considerations

Lets Review


Flow Control Costs

Capital - Compare the cost of a PC/VFD to the

cost of a centrifugal/control-valve. Maintenance - Compare the maintenance to that

of a centrifugal/control valve. Operating PCs are ideal for GPM:PSI ratios of 1

or less. Also consider the idea of eliminating

compressed air on control valves. QC Is stable blending important to your end

user?


Flow Control Performance

Is turndown important? Where are you operating on the centrifugal pump

curve? Multiple component and continuous blending. Do you customer want to see tighter control which

leads to continuous blending. Varying suction head conditions.


Other advantages

Shear sensitive fluids. High viscosity fluids. Vertical mounting for space constraints.

Documents

Pump