CTP Mechanically Sealed Plastic Centrifugal Pump

How does the CTP Plastic Centrifugal Pump work?

In order to start the pump, the casing has to be filled with liquid before start-up and have a positive suction head to operate efficiently. The NPSHr (Net Positive Suction Head Required) can be provided during the selection and assessment of the pump for your intended application.

Upon start-up, the liquid enters the pump casing axially onto the eye of the impeller. The rotating impeller generates a centrifugal force accelerating the liquid through the pump casing and into the discharge piping. As the fluid is accelerated by the impeller and thrown towards the discharge outlet a low pressure point is generated at the eye of the impeller effectively drawing fluid from the suction side to the pump and continuing the pumping cycle.

Applications

CTP Pumps are typically used for tank to tank transfer applications, they can also, however, be used for pressure boosting, dispensing, loading and offloading, tank cleaning, batching & metering, when used in conjunction with some of our wide range of control accessories.

The CTP Range is ideally suited to the following applications:

Chemical Transfer: Storage tanks to smaller vessels and containers.

Surface Treatment: Transfer, Filtration & Circulation round Surface Treatment Baths

Food & Beverage: CIP Processes

Water Treatment: Dosing & Transfer of Acids, Alkalis used in Cleaning Chemicals & Nanofiltration

Chemical Manufacturing: Transfer & Pumping of Chemicals & Industrial Detergents

Demineralisation: Circulation & Transfer of Demineralised Water

Photo Processing: Transfer of Photo Developmental Chemicals & Integration into Processing Machines

Liquid Crystal Manufacture: Transfer & Circulation of Concentrated Acids & Alkalis with Crystals in Suspension

Features & Benefits

PP & PVDF wetted materials

Can handle highly corrosive liquids also containing solids and metallic particles. Pumps can handle high temperature liquids, Alkali and acids. The version in PP-GF (glass fibre reinforced polypropylene) provides great mechanical strength and allows liquid temperatures up to 70°C. The PVDF version has superior chemical resistance and allows temperatures up to 80 – 90°C.

Semi-open Impeller

Allows pumping liquids with particles up to 3mm and 10% in concentration. Compared to the pumps with magnetic coupling, metallic particles are no obstacle for the CTP Pumps. A semi-open impeller also eases the transfer of liquids with higher viscosity.

Non-metallic Pumps

The wetted components are non-metallic injection moulded thermoplastics enabling excellent corrosion resistance. The shaft is protected by means of a plastic sleeve and nut compatible with the pump housing material.

Safety Drain

The special revision hole in the back of the casing provides a drainage from the mechanical seal in case any leakage occurs. This prevents the motor and shaft from coming into contact with the pumped liquid. The PVDF barb connector allows plug  a hose and route the liquid out of the pump.

Mechanical Seal

The spring is located on the dry side of the pump therefore all metallic parts are protected against contact with the liquid. This means no elastic bellow is required.

Connection Options

CTP Mechanically Sealed Plastic Centrifugal Pumps can be supplied with 4 different connection options:

• BSPT M Threaded: Standard
• DIN Flanged: 4F
• ANSI Flange: 4A
• Hose Connection: 4H

Impeller Options

5I – Impeller Trimming

Impellers can be trimmed, which means reducing their outside diameter, resulting in a reduced circumferential speed inside of the pump and therefore capacity. This operation can be carried out to ensure that the pump matches the required duty point.

Throttling the pump can allow for flow and pressure control of the pump by moving up and down the performance curve by means of changing the system pressure. This, however, is an inefficient method of pump control. Reducing the impeller diameter is an easy and effective way of permanently reducing both the flow and head capabilities of the pump without changing the rotational speed of the unit and wasting power.

Impellers can be trimmed by a maximum of 10 mm from the maximum nominal diameter.

Motor Options

• The CTM units are fitted with Safe Area IP55 Motors in Aluminium Casings as standard and are in line with all current Energy Efficiency Class legislation.
• Motor Powers vary from 0.75 kW up to 4 kW in standard IEC frame sizes in both 50 & 60 Hz and Single or 3 Phase.
• S1 Duty Class is standard.
• 2 Pole units are supplied as standard.
• Cast Iron Casings can be supplied upon request to provide a more robust casing material for external applications or particularly arduous environments.
• Special Voltages are also available upon request, 110V & 500V for example.
• PTC Thermistors can also be supplied upon request when motors are to be controlled by variable frequency drives and to monitor motor temperature rises.

Configuration Options

Trolley Mounted Units can be supplied with motor sizes up to 4.0 kW, with 2 or 4 wheels (2 fixed, 2 free), mounting plate for control apparatus, hose wrap points & / or fitted with a variety of dedicated control & protection features.

Such as:

• Start / Stop Isolating Switches & Fixed Speed Control Panels
• Variable Speed Control Panels
• Batching Control & Flow Metering
• Remote / Radio Control
• Dry Run Protection
• Protection against Water Hammer

The units can also be hygienically rated for use in food environments and fitted with pneumatic wheels for use on uneven surfaces. The result is a mobile range of pump units providing a solution to a widespread of technological processes. The portability of the units allows easy movement to various locations with almost limitless applications.

With Tapflo’s customised Mobile Solutions, the user is provided with not only a product but functionality. Based on our extensive experience with pumping skid units, we deliver complete “made to measure” mobile units, ready to use out of the box.

Materials Data