Performance requirements for dredging hoses

  • Ozone aging resistance of outer rubber layer

ISO28017:2009 (E) stipulates the ozone resistance of the outer rubber layer: “In 50pphm ozone concentration at 40°C and 20% strain After 72 hours, cracks and other abnormal phenomena should not be seen under a 2x magnifying glass.”

  • Bending performance

For ordinary mud discharge hoses, it is generally stipulated that the bending angle is ≥10°. For the floating mud discharge hose, the supplier and the buyer generally agree that the bending angle is ≥90°.

  • Floating performance

The general agreement between the two parties on the floating performance requirements of the floating mud discharge hose is: when the density of the conveying material in the pipe is not greater than 1.5t/m3, the volume of the hose emerging from the water surface is ≥ 20%.

  • Tensile performance

For general dredging hoses, users do not require tensile properties. However, some hoses installed in special parts, such as bow blowing hoses, have tensile performance indicators. For example, the first section of the DN800×11800 bow blowing hose matched with the Wanqingsha dredger is required to be able to withstand 57 tons of tension.

  • Environmental performance

The anti-aging agent D of naphthylamine rubber compound is an earlier anti-aging agent, which has good protection performance and is relatively cheap. Due to the detection of free β-naphthylamine, which can cause cancer, it has been withdrawn from use and replaced by p-phenylenediamine and phenolic antioxidants.

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