1. Ipayipi elidala kanye nokulinganisa iseva kwepayipi.
2. Izinto zepayipi zi-pyknotic futhi zilingana, kanti ezinye izinto azikwazi ukudlulisa umsindo kahle;
3. Ubuso bodonga lwamapayipi bune-coating efana nopende;
4. Ukusetshenziswa akulona ipayipi lamanzi eligcwele;
5. Ingaphakathi lepayipi linamabhamuza omoya amaningi noma amaphesenti amakhulu ezinto eziqinile;
6. Ipayipi/ithubhu eliqondile alide ngokwanele.
7. Indawo yokufaka imitha iseduze nomfula ongaphezulu kwepayipi elifake ivalvu;
8. Isiguquli noma ukuphazamiseka komsindo endaweni.
9. I-medium elinganisiwe uhlobo lwengxube noma uketshezi oluthile olune-acoustical conductivity embi, njengendle eluhlaza, udaka, udaka, njll.
10. Uketshezi oluqondiswe ekugelezeni kwepayipi lusuka phezulu luye phansi noma lufakwe njengendawo ephezulu yepayipi, okwenza amanzi epayipi angagcwali noma amabhamuza agcwale endaweni yokufaka.
Isikhathi sokuthunyelwe: Juni-30-2022