What is the diameter of DN 125 pump pipe?

Concrete pump pipe as an indispensable accessory in modern building construction, its specification parameters directly affect the construction efficiency and quality. Among them, DN125 pump pipe is one of the most commonly used specifications, which is widely used in all kinds of concrete conveying scenarios. This article will comprehensively introduce the DN125 pump pipe diameter size, different types of outer diameter differences, material properties and application scenarios, to help industry practitioners better understand and choose the right pump pipe products.

Basic diameter parameters of DN125 pump pipe
DN125 is the standard nominal diameter marking of concrete pump pipe, indicating that its nominal inner diameter is 125 mm. However, in actual application, the outer diameter of DN125 pump pipe will vary for different types and uses. According to industry standards and actual production, the DN125 pump pipe outside diameter is mainly concentrated in the 133mm to 140mm.
In the field of concrete pump pipe, DN125 specifications are usually categorized into two types: high pressure and low pressure. The welded flange outer diameter of the low-pressure type is Φ148mm, while the welded flange outer diameter of the high-pressure pipe is Φ157mm.This design difference makes the high-pressure pipe able to withstand greater conveying pressure, which is suitable for long-distance or high-rise concrete pumping operations.

DN125 pump pipe material and wall thickness selection
The performance of DN125 concrete pump pipe depends largely on its material and wall thickness. Common materials on the market include:
Carbon steel material: such as ST52, 20#, Q235, etc. This kind of pipe has lower cost and is suitable for general construction environment, and its service life is usually 15,000-20,000 cubic meters of concrete conveying capacity.
Alloy steel materials: such as 37Mn5, 45Mn2, 55Mn, etc., have higher strength and wear resistance. Especially 45Mn2, 55Mn alloy steel pipes with quenching treatment have a service life of 25,000-40,000 cubic meters8.
Double-layer wear-resistant pipe: made by special process, such as high chromium alloy + Q235 combination, the service life can be up to 50,000-80,000 cubic meters, which is 4-8 times of the ordinary pipe.
In terms of wall thickness, there is a wide range of choices for DN125 pump pipe, ranging from 4mm to 11mm. Common wall thickness specifications include 4.0mm, 4.5mm, 5.0mm, 5.5mm, and 7.0mm. Thicker pipe walls can withstand higher pressures, but they also increase weight and cost. Users need to choose the appropriate wall thickness according to the specific construction pressure requirements and wear resistance needs.

Types and application scenarios of DN125 pump pipe
According to the way of use and structural characteristics, DN125 concrete pump pipe is mainly divided into the following categories:
Straight pipe: various length specifications, commonly 1m, 2m, 3m, 6m, 9m, 12m, etc.8. Straight pipe is the basic component of the pumping system, which is used for conveying concrete in straight sections.
Elbow: such as DN125 R500 90° elbow, used to change the conveying direction, the material is mostly ST52 or 37Mn5, and the flange size is usually SK148mm.
Boom tube: Specialized in pump truck boom system, light weight and wear-resistant. High-end products adopt double-layer wear-resistant design, the service life can reach more than 30,000 cubic meters.
Rubber hose: Used at the end of pumping, DN125 rubber hose is usually equipped with a steel wire layer, with a working pressure of up to 85 bar and a burst pressure of 170-220 bar.

In terms of application scenarios, DN125 pump hose is widely used in:
High-rise building construction
Bridge project construction
High-speed railway projects
Large-scale infrastructure construction
Concrete conveying in special environment

Precautions for choosing DN125 pump pipe
When choosing high-quality DN125 concrete pump pipe, it is recommended to pay attention to the following points:
Material certification: check whether the products provide mechanical test reports and material certificates.
Process standards: high-quality pump pipe usually adopts automatic welding process and surface treatment such as sandblasting and painting.
Flange matching: Confirm that the flange specifications are compatible with the existing equipment.
Cost-effective assessment: Select pipes with appropriate life expectancy based on expected usage to avoid over-investment or frequent replacement.

DN125 concrete pump pipe as an important accessory in the construction industry, its diameter specifications and performance parameters directly affect the construction efficiency. Understanding the characteristics of different types of DN125 pump pipe can help users make more informed purchasing decisions and optimize construction costs.