Concrete Hose Blowout: Why It Happens and How to Prevent It

A concrete hose blowout refers to the sudden rupture or failure of a delivery hose during concrete pumping, causing pressurized concrete to leak or spray out. Such failures can occur in the hose body, or at connection points. Numerous real job site accidents have demonstrated that the sudden release of pressurized concrete can not only damage surrounding equipment but also inflict fatal injuries on nearby personnel. This article will introduce the common causes of concrete hose blowouts and how proper usage and maintenance can reduce the risk of such accidents for you.

What Causes Concrete Hose Blowout?

Concrete delivery hoses mainly consist of an inner tube, reinforcement, and an outer cover. During prolonged use, the various components of the hose undergo varying degrees of wear. As wear accumulates across different sections, incidents such as line blockages or pressure spikes can lead to a blowout of the hose or its connection points. The following are some common causes of concrete hose blowouts:

Hose Wear and Damage

The inner tube is subjected to constant, direct impact from concrete aggregates; as usage time and pumping volume increase, the inner wall of the hose gradually thins, eventually exposing the reinforcement. Wear on the reinforcement compromises the hose’s pressure-bearing capacity.

Moreover, this kind of continuous wear—occurring from the inside out—is not easily detected during routine, simple inspections. Sometimes, the outer cover may appear intact, yet the internal condition is compromised. Continuing to use the hose without taking precautions in such a state creates a risk of a concrete hose blowout occurring at any moment during subsequent pumping operations.

Blockages and Pressure Spikes

If a blockage occurs within the concrete hose, the pressurized concrete cannot flow normally, this causes a rapid increase in flow resistance and a corresponding rise in pumping pressure. If the hose is worn, or if the blockage occurs at a connection or coupling, the inability to properly relieve this pressure can lead to a hose blowout.

The blockage and the resulting pressure surge can trigger a blowout.

Wrong Hose Selection

When selecting a hose, you must consider the actual operating conditions of the concrete pumping process to ensure the hose functions correctly. If the hose’s working pressure is lower than the actual pumping pressure, the hose will be subjected to pressure exceeding its specifications during every pumping cycle, such usage will increase the risk of a concrete hose blowout.

Connection Problems

A blowout does not usually occur on the hose body itself, it can also happen at the connection point. Unlike a blowout in the hose body, if a fitting is cracked, loose, or improperly connected, its failure can cause the hose to suddenly detach from the connection, resulting in the high-speed ejection of pressurized concrete from within the hose.

Excessive Kinking

The hose itself is flexible and is frequently dragged and bent during use to ensure concrete is poured into the designated location. However, prolonged, repeated bending can damage the internal reinforcement, thereby reducing the hose’s pressure-bearing capacity. Excessive bending that creates a distinct kink can also cause the hose to crack, allowing pressurized concrete to leak from the damaged area and increasing the risk of a hose blowout.

If a blowout occurs suddenly on-site, there is often insufficient time to implement protective measures or evacuate personnel from the area for you. Therefore, routine inspections are crucial, they enable you to detect potential hose issues early and reduce the risk of a sudden blowout.

Concrete Pump Hose Inspection Checklist

Check for Excessive Inner Tube Wear

• Is there noticeable thinning of the inner wall?
• Is the wear concentrated in specific areas? What is the extent of the wear?
• Is there any accumulation of aggregate on the inner wall surface?

If the wear is severe enough to expose the reinforcement, you should stop using the hose and replace it.

Check the Hose Body for Damage

• Are there any cracks or signs of significant deformation on the outer surface?
• Has wear at frequently bent or dragged sections exposed the internal structure?

Inspect Fittings and Connections

• Is the connection between the fitting and the hose secure?
• Are there any cracks or damage on the fittings?
• Are there any signs of concrete leakage at the connection point?

Check for Kinking and Improper Bending

• Does the hose develop noticeable kinks during repeated dragging?
• Do these kinks cause structural deformation of the hose?
• Has the hose been subjected to excessive bending during use?

Check Working Pressure and Blockage Risks

• Is the actual pumping pressure within the hose’s normal working pressure range?
• Did the pumping pressure remain stable, or were there significant pressure fluctuations?
• Did any pipe blockages occur during pumping? If so, were the hose and connections inspected afterwards?

The points mentioned above are key areas to focus on when inspecting concrete pump hoses. They can also serve as early warning signs of a potential concrete hose blowout. These hoses require routine inspection and maintenance. It is recommended that your team keep records of every inspection, this enables rapid assessment and timely action should issues arise, thereby reducing the risk of accidents.

How to Choose a Replacement Concrete Pump Hose

Using a suitable concrete pump hose can improve on-site pumping efficiency and reduce the risk of concrete hose blowouts. Therefore, selecting the right replacement hose is a matter that deserves your attention. Beyond basic specifications, you should also consider the actual usage history of the old hose to choose one better suited to your specific operating conditions. The following purchasing guide is provided for your reference.

Required Working Pressure

Confirm that the hose’s rated working pressure meets the actual pumping pressure at the site and can withstand normal pressure fluctuations.

Correct Hose Size

Hose sizes include length, inner diameter, outer diameter, and thickness—ensure these specifications match the pumping system and fitting sizes.

End Fittings and Connections

In addition to the hose body itself, the connection points—being potential weak spots—must also be compatible. You need to verify that the hose’s fitting type, dimensions, and connection method are suitable for your existing equipment.

Pumping Conditions

Actual pumping conditions include the concrete mix design, aggregate size, and whether the hose needs to be frequently moved on-site. These factors will influence your choice regarding thickness, wear resistance, and other specifications.

Previous Hose Use

When replacing the hose, you also need to consider the previous usage history of the old hose and identify any obvious issues it had during operation. Select a replacement hose with improved performance based on these defects to prevent the same problems.

You might think that the danger of a hose blowout occurs near the hose body. However, records of actual accidents show that pressurized concrete ejected during a blowout has shattered car windshields as far as 15 meters away from the point of failure. The terrifying aspect of a concrete hose blowout is its suddenness; without sufficient on-site experience, a moment of carelessness could lead to serious injury.

If you are looking for replacement concrete pump hoses to meet on-site requirements for high-pressure concrete pumping, JEWINNERPARTS can manufacture custom hoses tailored to your specific requirements. Also there are whip check、whip sock or other hose restraint device are available for you to choose from.

If you have any question, just email us: info@jewinner.com, we will get back to you within 24 hours.