ASTM A182 F304 Xov Xwm Kev Ua Haujlwm Tshwj Xeeb yog ib qho tshwj xeeb piping tsim tsim kom nrawm thiab ruaj ntseg nrog cov kav dej. Lub Koom Haum Koom Tes Ntawm Tus Poj Niam National Taper (NPT) Xov ntawm ob xaus, muab kev sib xyaw ua ke nrog txiv neej xov paj. Nws yog feem ntau siv los piv rau lub installation, txij nkawm, thiab kev kuaj xyuas cov txheej txheem hauv cov tshuab luam yeeb.