Fomula yosinthira pakati pa liwiro la kuyenda mu payipi ndi liwiro la kuyenda:

Fomula yosinthira pakati pa liwiro la kuyenda mu payipi ndi liwiro la kuyenda:
Kuthamanga kwa madzi kumakhala kofanana ndi dera lozungulira payipi lomwe limachulukitsidwa ndi liwiro la madzi.
Lolani kuti liwiro la kuyenda likhale Q, m'mimba mwake wamkati mwa payipi likhale D, ndipo liwiro la kuyenda kwa madzi likhale V. Kenako Q = π(D/2)²×V.
Pamene gawo la Q ndi m³/h, gawo la D ndi m, ndipo gawo la V ndi m/s:
Q = π(D/2)²×V×3600 = 2827×D²×V (m³/h).