Tapflo UK was approached by an existing client, a global leader in sustainable technologies, to provide a Custom Chemical Dosing Pump solution for a new project.
Chemical Dosing Pump Solution
- Client: Global Science & Chemical Company
- End-User:Â Fine Chemicals & Catalysts Division
Initially, a PTL Low-Pressure Peristaltic Pump was suggested, along with the option of an Air Operated Diaphragm Pump (AODD), both of which would have met the original specifications for flow and head. But without further protection, a hose or diaphragm failure would mean the aggressive process media may leak into the surrounding environment and cause a potential hazard to operators. It was therefore deemed necessary to increase the protection measures to protect the pump, the environment, and the operators.
The agreed solution was to design a bespoke Peristaltic Pump system that allows a variable flow for multiple applications, which has more than enough protection in the event of a hose rupture. We modified a PPA Corrosion-Resistant Peristaltic Pump to meet the customers’ needs. The pump was specifically designed for corrosive and hazardous applications within the water treatment industry. The key design features of this range meant that the pump perfectly lent itself to our customer’s application.
Unlike standard Peristaltic Pumps which feature painted metallic casings (usually Aluminium or Cast Iron), the PPA range features include:
- A corrosion-resistant carbon coating and roller assembly, featuring Nyaltron Rollers
- Double sealing between the casing and the gearbox, which also protects the drive end.
- Painted with anti-corrosion coating featuring Primary and Final Polyurethane. Acryl-Epoxy, 150 microns thickness.
As a result, the PPA Corrosion Resistant Peristaltic Pump provides a reliable Chemical Dosing Pump solution, ensuring maximum corrosion resistance, increased safety and reduced costs by eliminating the replacement of unnecessary spares for the customer.
The final solution was a bespoke PPA13 pump which was ATEX Eexd IIB T4-rated, inverter-controlled and fitted with an ATEX-rated hose rupture detection Sensor with additional cooling and an oversized motor. This ensured that the customer had a wide flow and pressure envelope to work with, as well as a pump which provided the perfect protection against its application to meet safety requirements.
Application Details and Requirements
The application required an ATEX pump that would be able to fulfil the material characteristics:
Fluid/s:Â Various chemicals, but most notably Allyl bromide, Phosphoric Acid, HCL & CIP fluids.
Flowrate:Â Variable dosing & filling rates, with high accuracy requirements.
- Dosing: Chemical – In aliquots of 0.2-1L.
- Charging: Chemical – 17L total charge.
- Charging: Chemical – 97L total charge.
- Dosing: Chemical – In aliquots of 0.2-1L.
- Charging: Chemical – 75L total charge.
Discharge:Â Horizontal 10m, vertical 5m.
PPA13 Solution
| Rated Capacity | 56 l/hr @ 23 rpm |
| Accuracy | ±0.5% |
| Max Discharge Pressure | 4 Bar |
| Max Suction Lift | 9 m |
| Max Solids Passage | 3 mm ø |
| Duty Class | Rated for Continuous Operation |
The Chemical Dosing system was fitted with a range of Peristaltic Pump accessories.
In-line Pulsation Dampener:
- PTFE Inserts & FKM Hose, Multi-Layered & Polyamide Reinforced.
- Reduces pulsation up to 90%, allowing for accurate reading of flow rate.
- Reduces stress on pipework and pump flanges caused by vibration & water-hammering effect.
- Surrounded by compressed gas (Air or Nitrogen), the reinforced rubber hose dampens the pulsation of the fluid. Only the inserts and hose material are in contact with the liquid, allowing for optimal resistance. The inline design allows for easy installation in any system.
Hose Rupture Detection Sensor:
ATEX-rated capacitive sensor fitted to the back of the bespoke PPA13 pump. Provides a signal to the PCS, alerting the operator of a hose rupture & switching off the pump.
Features & Benefits of the Chemical Dosing Pump
The chemical dosing pump has many features and benefits for this application including:
Oversized Motor: 0.25kW ATEX Zone 1 IIB T4-rated motor.
Selected to provide additional cooling to the unit. More cost-effective & space-efficient than an additional external cooling fan.
Electroless Nickel Plated Coating: All metallic parts are coated with an Electroless Nickel plating.
Provides resistance to the most aggressive chemicals, preserving the working life of metallic parts.
Enclosed Casing: Pump casing is completely enclosed.
Prevents spilling of harsh chemicals onto the floor or other pump components.
Leak Channel System: Fixed lip seal on hard shaft ring.
Prevents leaking chemicals from entering the gearbox & motor section.
Our Signature Hose: Multi-layered & Polyamide Reinforced.
Tested and proven to last up to 30% longer than other manufacturers, thanks to the multi-layering & reinforced design of our hoses. The most important part of a Peristaltic Pump to consider when it is the only wearing part!
Results
The end client was satisfied with the Custom Chemical Dosing System we created for them. It enhanced their application and ensured a safe, reliable and efficient pumping solution.
Tapflo provides custom chemical dosing systems to fit any client application needs.
Contact our expert sales team today to get started with yours.