Kev txiav txim siab cov ntaub ntawv kev sib txhuam hauv qab no yog qhov tseem ceeb heev rau kev kawm txog kev sib txhuam ntawm cov roj marine hauv cov roj uas tsis muaj sulfur thiab cov khoom siv qis, nrhiav kev daws teeb meem los txo qhov hnav thiab ua kom lub neej ntev ntawm cov khoom siv cav. Cov ntaub ntawv hauv qab no ntawm kev hnav feem ntau tshwm sim Nyob rau hauv qhov sib xyaw lubrication thiab ciam teb lubrication thaj chaw, los ntawm kev txhim kho qhov sib piv ntawm cov khoom siv ntxiv, cov khoom siv los tiv thaiv kev hnav thiab tiv thaiv kev hnav muaj peev xwm ntawm cov roj nplua nyeem tuaj yeem txhim kho, thiab kev pabcuam lub neej ntawm cov khoom siv kho tshuab tuaj yeem ua tau. txuas ntxiv hauv kev ua haujlwm tiag tiag.

Los ntawm kev tshuaj xyuas ntawm cov laj thawj tseem ceeb ntawm kev hnav, "lub tog raj kheej liner-piston nplhaib" ib feem ntawm lub cav marine muaj xws li plaub hom kev hnav hauv qab no:

(1) Kev qaug zog hnav yog ib qho tshwm sim uas qhov kev sib txhuam ntawm qhov chaw ua rau muaj qhov deformation loj thiab kev ntxhov siab hauv qhov chaw sib cuag, thiab ua rau tawg thiab puas. Kev qaug zog yog nyob rau hauv kev sib txhuam poob ntawm cov khoom siv kho tshuab hauv qhov qub;

(2) Abrasive hnav yog ib qho tshwm sim nyob rau hauv uas cov khoom tawv ua rau abrasions thiab shedding ntawm cov ntaub ntawv nto ntawm qhov chaw ntawm kev sib txhuam khub nyob rau hauv tus txheeb ze zog. Kev hnav ntau dhau yuav polish lub cav lub tog raj kheej phab ntsa thiab ncaj qha ua rau cov roj nplua nyeem tsis yooj yim rau kev ruaj khov ntawm lub tog raj kheej phab ntsa. Roj zaj duab xis, ua rau muaj zog hnav, aluminium thiab silicon nyob rau hauv cov roj yog lub ntsiab ua rau abrasive hnav;

(3) Adhesive hnav yog tshwm sim los ntawm qhov nce ntawm sab nraud siab los yog qhov tsis ua hauj lwm ntawm lub nruab nrab lubricating, kev sib txhuam khub ntawm qhov chaw "adhesive". Adhesive hnav yog ib hom kev hnav hnyav heev uas yuav ua rau cov khoom tshwj xeeb txheej ntawm lub tog raj kheej liner kom tev tawm, ua rau muaj kev puas tsuaj loj rau kev ua haujlwm ntawm lub cav;

(4) Corrosion hnav yog qhov tshwm sim ntawm cov khoom poob los ntawm cov tshuaj lom neeg lossis electrochemical cov tshuaj tiv thaiv ntawm cov khoom siv saum npoo thiab qhov nruab nrab nyob ib puag ncig thaum lub sij hawm tus txheeb ze txav ntawm kev sib txhuam ntawm qhov chaw, thiab cov khoom poob los ntawm kev ua haujlwm. Nyob rau hauv cov ntaub ntawv ntawm corrosion hnyav heev thiab hnav, cov khoom nto ntawm lub tog raj kheej phab ntsa yuav tev tawm, thiab txawm tias thaum sib txhuam ntawm nkawm khau ntawm qhov chaw sib txawv, cov txheej txheej saum npoo yuav plam cov khoom qub thiab raug puas tsuaj loj.