At the end of April, Nanjing Deers completed the production of one batch of floating dredging hose. According to the client’s requirements, floating dredging hoses were tested by BV department. The content of this BV test is the appearance, size, water pressure, and bending test of the self-floating hose.
Appearance and Size Test
In terms of appearance, the floating dredging hoses have two marks: the main logo in the middle and the English + number on the side. BV inspectors checked the logo and observed whether the appearance was smooth, cracked, flange and hose cavity. The size measurement selects a certain number randomly, and mainly measures the flange parameters (outer diameter, center distance, number, and diameter of holes) as well as the inner diameter and length of the hose.
Water Pressure Test
As for the water pressure test, no pressure relief was observed when the pressure was held for 5 minutes under the test pressure. The measured data showed that the hose body became longer and the outer diameter of the hose body became smaller, indicating that the hose body would become longer and thinner under the condition of increasing pressure.
Bending Test
Bending test is carried out at the working pressure, using the method of drawing parallel lines to measure the included angle between the two flanges, adding water to make the pressure reach the working pressure, and using the electric hoist to bend the pipe body to the designed angle, observe the changes or abnormalities of the hose body, the test results without pressure relief and crack.
