DN125 concrete pump pipe

Basic parameters of DN125 concrete pump pipe
DN125 concrete pump pipe refers to the concrete conveying special pipe with a nominal diameter of 125 millimeters, which is widely used in the concrete pumping system in all kinds of construction projects. As the key channel connecting the concrete pump and the pouring part, this kind of pump pipe needs to withstand high pressure, wear-resistant and have good sealing performance.
In terms of basic specifications, DN125 pumping pipes are usually characterized by the following parameters: the outer diameter is usually 133mm or 140mm (for high pressure models), and the wall thickness ranges from 4mm to 12mm, depending on the pressure level required.310 The standard length is usually 1-6 meters, and longer sizes can be customized according to customer requirements. The flanged connection end is usually SK148mm standard (low pressure pipe) or larger 175mm/194mm flanges (high pressure pipe) to ensure a strong and airtight connection.
For material selection, high quality DN125 pump pipe mostly adopts high manganese casting materials such as ST52 high-strength steel, 37Mn5, 45Mn2, etc. Some economical products use Q235, Q345 or 20# carbon steel. These materials have excellent compressive strength and wear resistance after special heat treatment process. Taking ST52 pump pipe as an example, its service life can be more than 8 times that of ordinary steel pipe, which is especially suitable for the construction environment of high-intensity continuous operation.

Product classification and structural characteristics of DN125 concrete pump pipe
According to the use scene and structural differences, DN125 concrete pump pipe is mainly divided into the following categories:
Metal hard pipe is the main part of concrete conveying system, including straight pipe, elbow pipe and reducer pipe. This type of pump pipe is processed by seamless steel pipe or straight seam welded pipe, and the pipe body and flange are connected by automatic welding process to ensure the structural strength and sealing. High-pressure models of metal pump pipe wall thickness of up to 8-12mm, and equipped with larger flanges (such as 175mm or 194mm) and special pipe clamps to withstand higher working pressure. The surface treatment usually adopts painting or electrostatic spraying, which is both corrosion-resistant and beautiful.
Rubber hose is mainly used at the end of the pump truck as the last flexible connection for concrete delivery. This kind of hose adopts multi-layer steel wire reinforced structure: the inner rubber layer is made of polyurethane and butyl rubber, which has high abrasion resistance and high pressure resistance; the reinforcing layer is 2-4 layers of copper-plated steel wire braided or twisted, which provides pressure-resistant support. The working temperature range of standard DN125 rubber hose is from -40℃ to +70℃, the bending radius is not less than 1 meter, and bending more than 60 degrees should be avoided when using.

From the pressure level, DN125 pump hose can be divided into:
Low-pressure pumping pipe: working pressure not more than 4MPa, flange size 148mm, wall thickness 4-5mm, suitable for general building construction.
High-pressure pumping pipe: working pressure up to 10MPa, with increased flange (175mm or 194mm) and thicker wall (6-10mm), suitable for high-rise buildings and bridge projects.
Ultra-high-pressure pumping pipe: designed for special projects, adopting double-flange bolt connection, with stronger pressure bearing capacity.

DN125 concrete pump pipe performance advantages and technical parameters
With its excellent durability and efficient conveying capacity, DN125 concrete pump pipe has become the standard configuration for modern building construction. From the point of view of technical parameters, the burst pressure of high-quality DN125 metal pumping pipe can be up to 2-3 times of the working pressure to ensure the safety of construction. Taking the pump hose made of ST52 as an example, its single conveying capacity can reach 10,000-12,000 cubic meters of concrete (normal type) or higher (high-pressure type), which significantly reduces the frequency of replacement and maintenance costs.
In terms of connection, the DN125 pump pipe adopts a standardized flange system to ensure compatibility with all types of concrete pumps. The common SK148mm flange can be quickly installed and removed to improve construction efficiency; the high-pressure model adopts a more stable bolt connection to prevent loosening under high pressure.
From an economic point of view, although the unit price of DN125 pumping pipe is higher than that of common steel pipe, its extra-long service life and reduced maintenance costs make its overall cost of use superior. Take wear-resistant steel pipe as an example, its service life can be up to 5-8 times that of ordinary steel pipe, significantly reducing the replacement downtime and labor costs.

Application scenarios and selection suggestions for DN125 concrete pump pipe
DN125 concrete pump pipe is widely used in various construction scenarios, and it is crucial to choose the right type of pump pipe according to the project characteristics. For high-rise building construction, the recommended use of high-pressure or ultra-high-pressure metal pumping pipe, the initial section should be the highest pressure level fittings, with the increase in height can gradually reduce the pressure level, but need to ensure that the system’s overall pressure-bearing capacity. This type of project, the pump pipe needs to withstand more than 20MPa pressure, wall thickness should be selected 8mm and above, the flange connection needs special reinforcement.
In bridges, tunnels and water conservancy projects, due to the long conveying distance and high concrete grade, also recommended the use of high-pressure configuration. DN125 high-pressure pumping hose with 4 layers of steel wire rubber hose to ensure the flexibility of the end of the pouring and the overall pressure resistance of the system. It is worth noting that in tunnels and other space constraints, the rubber hose bending performance is particularly important, but need to strictly adhere to the bending limit of no more than 60 degrees.
For ordinary residential buildings and industrial plants and other low-pressure application scenarios, the standard DN125 low-pressure pumping hose (wall thickness of 4-5mm, flange 148mm) can meet the needs of more economical. In this type of project, the pumping system pressure is usually below 4MPa, focusing on the wear resistance of the fittings should be considered and the convenience of connection.

Maintenance and Precautions
Correct usage and maintenance measures can significantly extend the service life of DN125 concrete pump hose. For metal pump pipe, make sure the connection is firm and well sealed when installing to avoid slurry leakage and pressure loss. Before and after each use, the hose body should be checked for deformation, cracks or excessive wear, especially the bending part of the hose is more prone to wear and tear and needs to be focused on9.
For routine maintenance, it is recommended that a regular inspection system be established to record the usage time and delivery volume of each pump hose.DN125 rubber hoses usually need to be replaced after delivering 10,000-12,000 cubic meters of concrete (high pressure type lasts longer), while metal pump hoses have a longer replacement cycle. A suitable quantity of spare hoses should be kept in stock, especially fragile bends and end hoses, to avoid construction interruptions.
When transporting and storing, the hose should be handled gently to avoid collision damage. Metal pipes can be stacked in multiple layers but need to protect the flange surface with a partition; rubber hoses should be stored flat or hanging to avoid folding and pressure. Long-term storage should be placed in a dry and ventilated place, the surface of the metal hose can be coated with antirust oil, while the rubber hose needs to avoid direct sunlight and ozone sources.

The following key factors should be noted when purchasing:
Material certification: Suppliers are required to provide material certificates and mechanical test reports to ensure compliance with standards such as ST52 and 37Mn513
Pressure level: Select low-pressure (4MPa), high-pressure (10MPa) or ultra-high-pressure pump tubing according to project requirements.
Flange standard: Confirm compatibility with existing equipment, commonly available in SK148 model.

DN125 concrete pump pipe as a key component of modern and efficient construction, its performance and quality directly affect the project progress and cost. By understanding the characteristics and application scenarios of various types of pump pipes, the constructor can make more scientific purchasing decisions and maximize the benefits. As a professional supplier, we are ready to provide customers with technical advice and customized solutions to jointly promote the efficient development of the construction industry.