Engineering That Connects Theory To Industrial Practice
Conheça o curso Bombas de Deslocamento Positivo
Conteúdo da Aula
Our Youtube Channels
BOMBAS DOSADORAS: ENTENDA O FUNCIONAMENTO E OS PRINCIPAIS TIPOS
As bombas dosadoras são equipamentos essenciais em processos industriais que exigem o controle preciso de vazões. Como o próprio nome sugere, elas são utilizadas para dosar quantidades exatas de fluidos, sendo fundamentais para garantir a qualidade de processos químicos, alimentícios, farmacêuticos, entre outros.
Essas bombas têm a capacidade de bombear vazões com alta precisão, operando dentro de tolerâncias muito pequenas. Isso é crucial quando se trabalha com substâncias que exigem dosagens rigorosas, tanto para evitar desperdícios quanto para manter a segurança do processo.
Em geral, as bombas dosadoras são do tipo deslocamento positivo, também chamadas de bombas volumétricas ou hidrostáticas. Isso significa que elas deslocam volumes fixos de fluido a cada ciclo de operação, mantendo a vazão constante, independentemente da pressão do sistema ou da viscosidade do fluido.
Entre os principais tipos de bombas dosadoras, destacam-se:
Bombas de Pistão: Utilizam um pistão que se move para frente e para trás dentro de uma câmara. Esse movimento aspira e depois empurra o fluido através de válvulas de retenção. A vazão pode ser ajustada tanto pela frequência de ciclos quanto pelo curso do pistão.
Bombas de Diafragma: Parecidas com as de pistão, mas com um diafragma que separa o fluido da parte mecânica. Isso permite o bombeamento de produtos químicos agressivos, protegendo os componentes internos da bomba.
Bombas Peristálticas: Possuem um rotor que comprime uma mangueira flexível, empurrando o fluido para frente. Como o fluido só entra em contato com a mangueira, é ideal para aplicações sanitárias ou corrosivas.
Bombas Eletrônicas Peristálticas: Modelos menores com motores de corrente contínua ou de passo, permitindo controle fino da vazão. São muito utilizadas quando se precisa de ajuste preciso e constante da dosagem.
Cada tipo de bomba apresenta vantagens específicas conforme a aplicação. Por isso, a escolha correta depende das características do fluido, da precisão exigida e das condições do processo.
Meet the Teacher
🎓 Academic Backgroung:
- Mechanical Engineer from UNIFEI (Federal University of Itajuba)
- Master in Nuclear Technology from USP/IPEN (University of São Paulo - Nuclear and Energy Research Institute)
- Specialist in Higher Education Didactics (Uniderp)
🏭 Professional Experience
- Over 20 years in the pump and industrial equipment sector
- Technical consultant and instructor at OMEL, Vallair, and Embraseal
- Experience in technical sales and applications, and both in-person and online training.
👨🏫Teaching Career:
- Over 25 years as a lecturer
- Former university professor of Mechanical Engineering in São Paulo
📈 Engenharia & Cia
- Founder of the Engenharia & Cia Youtube channel, now with over 50,000 subscribers
- Trained more than 1,200 students
- Creator of the pump sizing software.
Pump Specification: Much More Than Just Sizing
Pump specification is a fundamental step in the design and operation of hydraulic and industrial systems. Although it is often confused with the sizing of the pumping system, specification goes far beyond simply calculating flow rate and total dynamic head.
It involves selecting pumps that precisely meet the needs of the application, considering technical, operational, and even economic variables.
Pumping System Sizing: The First Step
The sizing of the pumping system is, without a doubt, the foundation for beginning the specification process. At this stage, information such as the following is gathered:
-
Desired flow rate
-
Total dynamic head (TDH)
-
Piping characteristics (diameter, length, head losses)
-
Fluid properties (density, viscosity, temperature, presence of solids, etc.)
-
With this data, it's possible to draw the system curve and identify the ideal operating range for the pump.
Pump Specification: Choosing the Right Pump for the Application
But the key question goes further: is the correctly sized pump truly the right pump for the application?
This is where pump specification comes in, analyzing, among other factors:
-
Most suitable pump type (centrifugal, positive displacement, peristaltic, pneumatic, etc.)
-
Compatibility with the pumped fluid (abrasiveness, corrosiveness, toxicity)
-
Operation frequency (continuous or intermittent)
-
Ease of maintenance
-
Noise and vibration levels
-
Energy efficiency
-
Industry or process-specific standards and requirements
A properly sized pump may still be inadequate if, for example, it’s not compatible with the fluid’s viscosity, cannot withstand the system pressure, or lacks the durability required for the application.
Pump Selection with Technical and Strategic Insight
Pump selection must also take into account strategic aspects such as:
-
Availability of spare parts and technical support
-
Total cost of ownership (TCO)
-
Integration with control and automation systems
-
Sustainability standards and energy consumption
By combining pumping system sizing with a deep analysis of technical and operational requirements, pump specification ensures the selected equipment fully meets process demands, avoiding issues like premature failures, excessive energy consumption, and low efficiency.
Conclusion
Pump specification is a multidisciplinary task that requires technical knowledge, a systemic view, and field experience. It is not limited to pumping system sizing, but rather involves selecting pumps that truly deliver performance, reliability, and operational safety.
By investing time and attention in this step, you avoid rework, reduce costs, and improve the overall efficiency of your system.
Learn every step for properly sizing and selecting pumps with our course: SPECIFICATION OF PUMPS – CLICK HERE TO LEARN MORE.
