Nyob ntawm qhov ntev ntawm lub cable thiab qhov kub thiab txias, qhov kev siv hluav taws xob feem ntau yog 20 watts ib 'meter' hauv -20 degrees.
Antifreeze ua haujlwm:
(1) Ua ntej nkag mus rau lub caij ntuj no, tag nrho cov kav dej rwb thaiv tsev yuav tsum tau ua tib zoo tshuaj xyuas, thiab cov khoom ntawm cov txheej txheem rwb thaiv tsev ntawm cov kav dej uas tau poob thiab puas yuav tsum tau kho raws sij hawm, thiab kev ntsuas rwb thaiv tsev tsim nyog yuav tsum tau ua rau cov kav dej tawm sab nraud, valves, hluav taws kub hydrants, thiab lwm yam.
(2) Rau lub qhov dej ntawm lub qhov dej, qhov dej ntsuas dej thiab qhov dej tua hluav taws uas muaj qhov tsis zoo ntawm cov manhole npog lossis qhov tob tob, lawv yuav tsum tau ntim nrog cov quav nyab qhuav lossis lwm cov ntaub ntawv thermal rwb thaiv tsev uas tsim nyog ua ntej tuaj txog ntawm qhov txias snap.
(3) Thaum muaj cov kav dej thiab cov kav dej phwj tuaj thiab cov chaw ua cua sov (cov cua sov chav lossis qhov cub) hauv chav, qhov kub hauv tsev yuav tsum tsis txhob txo qis qis dua 0 degree, txhawm rau tswj qhov kub hauv tsev, qhov cua sab hauv tsev. lub sij hawm yuav tsum tsis txhob ntev dhau lawm, thiab qhib qhov rais tsis pub nyob ib hmos (tsis muaj chav dej thiab chav ntxhua khaub ncaws yuav ua rau qhov teeb meem no).
