Pipeline specification: use 125 mm OD pipe for outputs above 80 m³/h; 100 mm is acceptable below that, but velocity must stay under 5 m/s to prevent segregation. Always place a 1 m long 150-to-125 mm tapered reducer at the hopper outlet to minimize turbulence. Gaskets are rated for 150 bar; discard any with visible cracks or Shore-A hardness below 70. Secure every coupling with two safety pins at 90 ° apart; vibration loosens single pins within 20 minutes of high-pressure pumping.

 

 

Personnel: establish a 10 m exclusion zone around the end-hose; a whipping 5-inch hose generates 3 500 N of force—enough to fracture bones. Equip the nozzleman with a dead-man remote that defaults to STOP when released. Finally, test emergency stop buttons monthly; 17 % of injuries occur when E-sticks fail due to concrete splash seizing the switch.