Asphalt pumps are essential industrial equipment in the asphalt, petrochemical, road, and heavy-duty transport industries. They are responsible for transporting, unloading, and conveying asphalt. Due to its high viscosity, concentration, and operating temperature, conventional pumps are unable to process asphalt. Therefore, special pumps with a specially designed design that are heat- and corrosion-resistant are required, especially asphalt pumps .
Structure and function of an asphalt pump
Asphalt pumps are typically constructed of wrought iron, steel, or bronze and consist of a casing, an impeller (or gear), a pump shaft, a mechanical seal, and a heating jacket. These pumps typically use a hot oil or steam heating system
to prevent the asphalt from cooling and hardening during transport.
An asphalt pump draws hot asphalt from an inlet and pumps it under pressure to an outlet via a rotating shaft, gears, or internal vanes . The pump is designed to ensure smooth, leak-free operation even at high temperatures (approximately 200–250 degrees Celsius).
Types of asphalt pumps
Depending on the application, temperature, bitumen viscosity, and delivery system, bitumen pumps are divided into different types . The most important of these types are:
1. Asphalt gear pump
This pump is the most commonly used type of asphalt pump. It features two rotating gears that pick up and pump the asphalt.
Features:
-
Suitable for transporting viscous materials such as asphalt, molasses and resins.
-
High temperature resistance
-
Simple design and easy maintenance.
-
Can be equipped with a heater (heating jacket).
2. Rotary vane pump
The rotor of this model is equipped with rotating blades that transport the asphalt from the inlet to the outlet.
Advantages:
-
uniform pressure and flow
-
Low vibration and noise levels
-
Suitable for flow-through systems.
3. Asphalt cam pump
Rotary lobe pumps operate with two or more pistons simultaneously and are commonly used in the food and asphalt industries.
Product features:
-
Material-friendly transport
-
Suitable for emulsified asphalt or materials containing solid particles.
-
High efficiency and long service life.
4. Centrifugal pump for asphalt
These types of pumps are used to transport lighter asphalt or semi-liquid mixes and are typically used in asphalt mixing plants.
Using an asphalt pump
Bitumen pumps are used in a wide variety of industries, including:
-
Asphalt production and distribution plants
-
Oil refineries and petrochemical complexes
-
Tank trucks for the transport of asphalt and industrial oils
-
Insulation industry and asphalt insulation production
-
Pipelines for pumping hot bitumen from tanks to boilers or mixers
-
Stations for loading and unloading asphalt concrete in bulk
In fact, an asphalt pump is one of the most important devices when thick and hot liquids need to be transported.
Features and characteristics of asphalt pumps
-
High temperature resistance: These pumps can usually withstand temperatures up to 250°C without any problems.
-
Corrosion and abrasion resistance:
Since the machine body frequently comes into contact with heavy and sticky materials, it is made of a corrosion-resistant alloy. -
Internal heating system:
Some models have a jacketed heating chamber that uses hot oil or steam to prevent the asphalt from cooling inside the pump. -
Continuous and stable operation:
The pump’s industrial design enables continuous operation under harsh operating conditions. -
Fewer leaks and longer service life:
High-quality, precision-machined mechanical seals are used to reduce leaks and extend service life.
MOYNO uses screw pumps to transport abrasive materials.
Important points when choosing the right asphalt pump
To buy the right asphalt pump, you need to consider several important criteria:
-
Asphalt type:
60/70 asphalt, emulsion asphalt or soft asphalt – each has a different viscosity that requires a different pump. -
Required flow rate (l/min): The pump capacity should be determined based on the amount to be pumped
per hour or per minute . -
Working pressure:
The pump must be able to pump bitumen in the desired direction and to the desired height. -
Heating systems:
Pumps with heating chambers ( jacket pumps ) are ideal for preventing bitumen from hardening. -
Materials for pump housing and shaft:
Selecting a corrosion-resistant alloy such as wrought iron , stainless steel or carbon steel is critical for the longevity of the pump. -
Power source and motor type: Asphalt pumps are typically powered
by electric or diesel motors . In areas where three-phase power is unavailable, electric motors are the best solution.
How to install and maintain an asphalt pump
Proper installation and maintenance are critical to the pump’s performance and service life. Important aspects include:
-
Preheating: Before starting, stages and pumps must be preheated with steam or hot oil.
-
Avoid dry running: Never operate the pump without bitumen or lubricant.
-
Replace the mechanical seals regularly to prevent leaks from hot asphalt.
-
Lubricate the bearings regularly and monitor the temperature: An increased temperature indicates friction or damage to the guides.
-
Cleans intake tract and filter: prevents engine power loss and overload.
Iranian asphalt pump brands and manufacturers
Several companies in Iran develop and manufacture asphalt pumps. Well-known local brands include:
-
grapefruit
-
Navid engines
-
Iranian bomb production
-
Pars pump
-
Pump for asphalt paver
In addition, foreign importers of pumps of the brands Viking , Johnson Pump and Rotan are active in the Iranian market .
Safety tips for using an asphalt pump
Working with hot asphalt carries certain risks, including burns and fire. Therefore, the following safety precautions should be observed:
-
Wear heat-resistant gloves and clothing.
-
Check fittings and valves regularly to avoid leaks.
-
Maintain a safe distance from heat sources.
-
Make sure that the area where the pump is installed is well ventilated.
-
Use a pressure relief valve to prevent pressure buildup.
Finally
Asphalt pumps are essential equipment in the asphalt industry and are specifically designed for transporting hot, thick asphalt . Selecting the right pump model, along with consideration of the heating system, pump material, and operating conditions, significantly influences the efficiency and service life of the system.
Finally, proper installation and regular maintenance ensure years of reliable operation and maximize production line productivity.