achieve the desiredsurface roughness. Depending on the specificspeednq, the
wheel types are eitherslow-running radialwheels(nqà10±30)or medium-
running radialwheels (nqà30±60).The specific speedrepresents a wheel-type
characteristic. For the specificspeednqconsistingof speednin rpm,volume
flowQin m^3 /s and flowheadHin m the followingnumericalequation applies:
nqàn
ÅÅÅÅ
Q
p
H^3 =^4
Fig. 18.1 Hygieniccentrifugalpump.
280 Handbookof hygiene controlin the foodindustry