Page 38

2014SprShotcreteEMag

Safety Shooter the weight of a hose and compare to a new hose. these characteristics probably has had its liner Check the feel of a hose. Is it “flimsy” when worn past its practical life span. compared to a new hose? A hose that exhibits The steel hose ends are typically the greatest wear points on hoses. Examine the hose body for excessive wear at the inlet and outlet faces, and for any signs of the hose barbs beginning to show on the inside of the hose body. Examine the hose ferrule for any movement between it and the hose body and hose. These are indications that the steel is worn out and the hose should be dis- carded. Many hoses have a sight hole located in the ferrule so you can check to make sure the hose isn’t pulling out of the ferrule (Fig. 3). Also, remember to examine the surfaces where the coupling gasket seats for dents, damage, or con- crete buildup. Hose failure can result in a plugged line in the best case; and injury or death to a shotcrete crew member or anyone else on the job site is a very real scenario. Routine inspections of your pumping hose are crucial to catching worn parts before they fail on the job. A few minutes spent checking over the hoses as they are being laid Fig. 2: The jacket on this hose has been damaged enough to expose the out or packed up can save a lot of time, effort, reinforcing cables, compromising the pressure capability of the hose. and cost spent dealing with a failed hose at a This hose needs to be replaced immediately job site. HOSE SAFETY GUIDELINES • Always wear proper personal protective equipment (PPE) on concrete pumping job sites! • Always use the correct hose for the job. A hose should not be used in applications where its rated working pressure is exceeded. • Never kink the hose. Kinks cause blockages and pressure spikes. The hose may straighten violently and cause personal injury. • Always verify that a blocked hose is not pressurized before opening any coupling. • Never look into a hose that is plugged. • Never use a hose with frays or breaks, or with the braiding or reinforcing exposed. Check both the outer cover and inner liner. A hose with exposed braiding is a guarantee it will not support its rated capacity. • Never sit, straddle, or stand on a hose. • Never use compressed air to clean a hose. • Never drag the hose by the coupling or drag the hose sideways with a manlift or crane. • Never beat on concrete pumping hose with a hammer or other object. This impact damages the reinforcing material and will lead to premature hose failure and rupture. • Hoses should be inspected on a daily basis. • Check the inside surface of the hose body. If there is excessive wear or exposed hose barbs, the hose must be discarded or returned to the factory for re-coupling. • Verify that the hose cover is visible through the ferrule inspection hole. • Typical concrete pumping hoses have rubber properties that resist sun damage and oxidation. To maximize the life span of a concrete pumping hose, store unused hoses in a clean, dry, dark place. • Concrete pumping hoses are designed for pumping concrete. Consult the hose company if any other product is pumped through its hoses. 36 Shotcrete • Spring 2014


2014SprShotcreteEMag
To see the actual publication please follow the link above