Handbook of Hygiene Control in the Food Industry

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