{"id":1438,"date":"2025-03-18T14:55:38","date_gmt":"2025-03-18T06:55:38","guid":{"rendered":"https:\/\/www.tflequip.com\/?p=1438"},"modified":"2025-03-18T14:55:38","modified_gmt":"2025-03-18T06:55:38","slug":"what-are-the-reasons-for-failure-and-leakage-of-centrifugal-pump-mechanical-seal","status":"publish","type":"post","link":"https:\/\/www.tflequip.com\/cs\/what-are-the-reasons-for-failure-and-leakage-of-centrifugal-pump-mechanical-seal\/","title":{"rendered":"Jak\u00e9 jsou p\u0159\u00ed\u010diny poruchy a net\u011bsnosti mechanick\u00e9 ucp\u00e1vky odst\u0159ediv\u00e9ho \u010derpadla?"},"content":{"rendered":"

Odst\u0159ediv\u00e1 \u010derpadla jsou v z\u00e1sad\u011b ut\u011bsn\u011bna mechanick\u00fdmi ucp\u00e1vkami, zat\u00edmco magnetick\u00e1 \u010derpadla jsou ut\u011bsn\u011bna statick\u00fdmi t\u011bsnic\u00edmi izola\u010dn\u00edmi pouzdry. Existuje mnoho typ\u016f mechanick\u00fdch ucp\u00e1vek pro odst\u0159ediv\u00e1 \u010derpadla a jejich modely se li\u0161\u00ed, ale existuje p\u011bt hlavn\u00edch m\u00edst net\u011bsnosti: ucp\u00e1vka mezi pouzdrem a h\u0159\u00eddel\u00ed; ucp\u00e1vka mezi dynamick\u00fdm krou\u017ekem a pouzdrem; ucp\u00e1vka mezi dynamick\u00fdm a statick\u00fdm krou\u017ekem; ucp\u00e1vka mezi statick\u00fdm krou\u017ekem a sedlem statick\u00e9ho krou\u017eku; ucp\u00e1vka mezi t\u011bsnic\u00edm koncov\u00fdm krytem a t\u011blesem \u010derpadla. Selh\u00e1n\u00ed a net\u011bsnost t\u011bsn\u011bn\u00ed \u010derpadla jsou velmi problematick\u00e9. A\u0165 u\u017e se jedn\u00e1 o odst\u0159ediv\u00e9 nebo magnetick\u00e9 \u010derpadlo, \u00fanik kapaliny je d\u016fle\u017eit\u00fdm faktorem zp\u016fsobuj\u00edc\u00edm nehody ve v\u00fdrob\u011b. N\u00e1sleduje anal\u00fdza a \u0159e\u0161en\u00ed probl\u00e9mu net\u011bsnosti zp\u016fsoben\u00e9 selh\u00e1n\u00edm t\u011bsn\u011bn\u00ed.<\/p>\n

 <\/p>\n

\"1120\"<\/p>\n

1. \u00danik b\u011bhem zku\u0161ebn\u00edho provozu<\/strong><\/p>\n

Po statick\u00e9 zkou\u0161ce mechanick\u00e9 ucp\u00e1vky \u010derpadla bude odst\u0159ediv\u00e1 s\u00edla vznikaj\u00edc\u00ed p\u0159i vysokorychlostn\u00ed rotaci b\u011bhem provozu potla\u010dovat \u00fanik m\u00e9dia. Proto po vylou\u010den\u00ed poruchy t\u011bsn\u011bn\u00ed h\u0159\u00eddele a koncov\u00e9ho krytu je net\u011bsnost mechanick\u00e9 ucp\u00e1vky b\u011bhem zku\u0161ebn\u00edho provozu v podstat\u011b zp\u016fsobena po\u0161kozen\u00edm dynamick\u00fdch a statick\u00fdch t\u0159ec\u00edch dvojic krou\u017ek\u016f.<\/p>\n

Hlavn\u00edmi faktory, kter\u00e9 zp\u016fsobuj\u00ed selh\u00e1n\u00ed t\u011bsn\u011bn\u00ed t\u0159ec\u00edho p\u00e1ru, jsou:<\/p>\n

(1) B\u011bhem provozu doch\u00e1z\u00ed v d\u016fsledku abnorm\u00e1ln\u00edch jev\u016f, jako je podtlak a kavitace, k p\u016fsoben\u00ed velk\u00e9 axi\u00e1ln\u00ed s\u00edly, kter\u00e1 zp\u016fsobuje odd\u011blen\u00ed sty\u010dn\u00e9 plochy dynamick\u00fdch a statick\u00fdch krou\u017ek\u016f;
\n(2) P\u0159i instalaci mechanick\u00e9 ucp\u00e1vky je stla\u010den\u00ed p\u0159\u00edli\u0161 velk\u00e9, co\u017e vede k v\u00e1\u017en\u00e9mu opot\u0159eben\u00ed a po\u0161kr\u00e1b\u00e1n\u00ed koncov\u00e9ho povrchu t\u0159ec\u00edho p\u00e1ru;
\n(3) T\u011bsn\u011bn\u00ed dynamick\u00e9ho krou\u017eku je p\u0159\u00edli\u0161 t\u011bsn\u00e9 a pru\u017eina nem\u016f\u017ee nastavit axi\u00e1ln\u00ed plovouc\u00ed velikost dynamick\u00e9ho krou\u017eku;<\/p>\n

(4) Statick\u00e9 t\u011bsn\u011bn\u00ed krou\u017eku je p\u0159\u00edli\u0161 voln\u00e9. Kdy\u017e dynamick\u00fd krou\u017eek axi\u00e1ln\u011b plave, statick\u00fd krou\u017eek se odd\u011bl\u00ed od sedla statick\u00e9ho krou\u017eku;
\n(5) V pracovn\u00edm m\u00e9diu jsou zrnit\u00e9 l\u00e1tky, kter\u00e9 se b\u011bhem provozu dost\u00e1vaj\u00ed do t\u0159ec\u00edho p\u00e1ru. Zjist\u011bte dynamick\u00e9 a statick\u00e9 \u010deln\u00ed plochy t\u011bsnic\u00edho krou\u017eku;
\n(6) Volba konstrukce je \u0161patn\u00e1, \u010deln\u00ed tlak t\u011bsn\u011bn\u00ed je p\u0159\u00edli\u0161 n\u00edzk\u00fd nebo t\u011bsnic\u00ed materi\u00e1l m\u00e1 velk\u00e9 smr\u0161t\u011bn\u00ed za studena. K v\u00fd\u0161e uveden\u00e9mu jevu \u010dasto doch\u00e1z\u00ed b\u011bhem zku\u0161ebn\u00edho provozu. N\u011bkdy jej lze odstranit spr\u00e1vn\u00fdm se\u0159\u00edzen\u00edm statick\u00e9ho sedla krou\u017eku, ale v\u011bt\u0161inu z nich je t\u0159eba demontovat a vym\u011bnit.<\/p>\n

2. Net\u011bsnost p\u0159i statick\u00e9 zkou\u0161ce instalace<\/strong><\/p>\n

Po instalaci a odlad\u011bn\u00ed mechanick\u00e9 ucp\u00e1vky je zpravidla nutn\u00e9 prov\u00e9st statickou zkou\u0161ku t\u011bsnosti. Pokud je net\u011bsnost mal\u00e1, jedn\u00e1 se v\u011bt\u0161inou o probl\u00e9m s dynamick\u00fdm krou\u017ekem nebo statick\u00fdm t\u011bsnic\u00edm krou\u017ekem; pokud je net\u011bsnost velk\u00e1, znamen\u00e1 to, \u017ee je probl\u00e9m mezi t\u0159ec\u00edmi p\u00e1ry dynamick\u00e9ho a statick\u00e9ho krou\u017eku. Na z\u00e1klad\u011b p\u0159edb\u011b\u017en\u00e9ho pozorov\u00e1n\u00ed net\u011bsnosti a posouzen\u00ed m\u00edsta net\u011bsnosti ru\u010dn\u011b oto\u010dte kole\u010dkem a pozorujte. Pokud nedojde k \u017e\u00e1dn\u00e9 zjevn\u00e9 zm\u011bn\u011b net\u011bsnosti, jedn\u00e1 se o probl\u00e9m se statick\u00fdm a dynamick\u00fdm krou\u017ekov\u00fdm t\u011bsn\u011bn\u00edm; pokud dojde b\u011bhem ot\u00e1\u010den\u00ed k v\u00fdrazn\u00e9 zm\u011bn\u011b net\u011bsnosti, lze ur\u010dit, \u017ee se jedn\u00e1 o probl\u00e9m s dynamickou a statickou krou\u017ekovou t\u0159ec\u00ed dvojic\u00ed; pokud je net\u011bsn\u00e9 m\u00e9dium rozst\u0159ikov\u00e1no pod\u00e9l axi\u00e1ln\u00edho sm\u011bru, jedn\u00e1 se v\u011bt\u0161inou o probl\u00e9my s dynamick\u00fdm krou\u017ekov\u00fdm t\u011bsn\u011bn\u00edm, a pokud je net\u011bsn\u00e9 m\u00e9dium rozst\u0159ikov\u00e1no v\u0161ude kolem nebo unik\u00e1 z otvoru pro chlazen\u00ed vodou, jedn\u00e1 se v\u011bt\u0161inou o poruchu statick\u00e9ho krou\u017ekov\u00e9ho t\u011bsn\u011bn\u00ed. Krom\u011b toho mohou sou\u010dasn\u011b existovat i net\u011bsn\u00e9 kan\u00e1ly, ale obecn\u011b se rozli\u0161uje prim\u00e1rn\u00ed a sekund\u00e1rn\u00ed. Pokud pozorn\u011b pozorujete a zn\u00e1te konstrukci, budete schopni spr\u00e1vn\u011b posoudit.<\/p>\n

3. Porucha zp\u016fsoben\u00e1 ztr\u00e1tou mazac\u00edho filmu na obou t\u011bsnic\u00edch ploch\u00e1ch.<\/strong><\/p>\n

(1) Vzhledem k existenci zat\u00ed\u017een\u00ed \u010deln\u00edho t\u011bsn\u011bn\u00ed se \u010derpadlo spou\u0161t\u00ed, kdy\u017e v t\u011bsnic\u00ed komo\u0159e nen\u00ed \u017e\u00e1dn\u00e1 kapalina, co\u017e zp\u016fsobuje such\u00e9 t\u0159en\u00ed;<\/p>\n

(2) Tlak m\u00e9dia je ni\u017e\u0161\u00ed ne\u017e tlak nasycen\u00fdch par, co\u017e zp\u016fsobuje vzplanut\u00ed kapaln\u00e9ho filmu na \u010deln\u00ed stran\u011b a ztr\u00e1tu maz\u00e1n\u00ed;<\/p>\n

(3) Pokud je m\u00e9dium t\u011bkav\u00fd produkt a v chladic\u00edm syst\u00e9mu mechanick\u00e9 ucp\u00e1vky dojde k usazov\u00e1n\u00ed vodn\u00edho kamene nebo jeho ucp\u00e1n\u00ed, zv\u00fd\u0161\u00ed se tlak nasycen\u00fdch par m\u00e9dia v d\u016fsledku t\u0159en\u00ed o \u010deln\u00ed plochy a tepla generovan\u00e9ho rotuj\u00edc\u00edm prvkem, kter\u00fd kapalinu m\u00edch\u00e1, co\u017e rovn\u011b\u017e zp\u016fsob\u00ed, \u017ee tlak m\u00e9dia je ni\u017e\u0161\u00ed ne\u017e jeho tlak nasycen\u00fdch par.<\/p>\n

4. Selh\u00e1n\u00ed mechanick\u00e9ho t\u011bsn\u011bn\u00ed zp\u016fsoben\u00e9 koroz\u00ed<\/strong><\/p>\n

(1) D\u016fln\u00ed vrypy a rovnom\u011brn\u00e9 pronik\u00e1n\u00ed do t\u011bsnic\u00ed plochy.
\n(2) Kv\u016fli sva\u0159ov\u00e1n\u00ed krou\u017eku z karbidu wolframu a sedla z nerezov\u00e9 oceli je sedlo z nerezov\u00e9 oceli b\u011bhem pou\u017e\u00edv\u00e1n\u00ed n\u00e1chyln\u00e9 k mezikrystalov\u00e9 korozi;
\n(3) Sva\u0159ovan\u00e9 kovov\u00e9 m\u011bchy, pru\u017einy atd. jsou n\u00e1chyln\u00e9 k prasknut\u00ed kombinovan\u00fdm p\u016fsoben\u00edm nap\u011bt\u00ed a st\u0159edn\u011b silnou koroz\u00ed.<\/p>\n

5. Porucha t\u011bsn\u011bn\u00ed v d\u016fsledku opot\u0159eben\u00ed \u010deln\u00ed plochy t\u011bsn\u011bn\u00ed<\/strong><\/p>\n

(1) Stupe\u0148 vyv\u00e1\u017een\u00ed \u03b2 mechanick\u00e9 ucp\u00e1vky ovliv\u0148uje tak\u00e9 jej\u00ed opot\u0159eben\u00ed. Obecn\u011b je vhodn\u00fd stupe\u0148 vyv\u00e1\u017een\u00ed \u03b2=75%. Pokud je \u03b2<75%, opot\u0159eben\u00ed se sice sni\u017euje, ale zvy\u0161uje se net\u011bsnost a mo\u017enost otev\u0159en\u00ed povrchu t\u011bsn\u011bn\u00ed. U mechanick\u00fdch t\u011bsn\u011bn\u00ed s vysok\u00fdm zat\u00ed\u017een\u00edm (vysokou hodnotou PV) je \u03b2 vzhledem k velk\u00e9mu t\u0159ec\u00edmu teplu \u010deln\u00ed plochy obecn\u011b 65% a\u017e 70%. Pro n\u00edzkovrouc\u00ed uhlovod\u00edkov\u00e1 m\u00e9dia, proto\u017ee teplota je citliv\u011bj\u0161\u00ed na zply\u0148ov\u00e1n\u00ed m\u00e9dia, je za \u00fa\u010delem sn\u00ed\u017een\u00ed vlivu t\u0159ec\u00edho tepla \u03b2 p\u0159ednostn\u011b 80% a\u017e 85%.<\/p>\n

(2) N\u00edzk\u00e1 odolnost proti opot\u0159eben\u00ed, velk\u00fd sou\u010dinitel t\u0159en\u00ed a nadm\u011brn\u00fd tlak na koncov\u00fd povrch (v\u010detn\u011b tlaku pru\u017einy) t\u0159ec\u00edho p\u00e1ru zkracuj\u00ed \u017eivotnost mechanick\u00e9 ucp\u00e1vky. U b\u011b\u017en\u011b pou\u017e\u00edvan\u00fdch materi\u00e1l\u016f je po\u0159ad\u00ed odolnosti proti opot\u0159eben\u00ed n\u00e1sleduj\u00edc\u00ed: karbid k\u0159em\u00edku - uhl\u00edkov\u00fd grafit, cementovan\u00fd karbid - uhl\u00edkov\u00fd grafit, keramick\u00fd uhl\u00edkov\u00fd grafit, st\u0159\u00edkan\u00fd keramick\u00fd uhl\u00edkov\u00fd grafit, nitrid k\u0159em\u00edku - keramick\u00fd uhl\u00edkov\u00fd grafit, rychlo\u0159ezn\u00e1 ocel - uhl\u00edkov\u00fd grafit a pl\u00e1tovan\u00fd cementovan\u00fd karbid - uhl\u00edkov\u00fd grafit.<\/p>\n

(3) U m\u00e9di\u00ed obsahuj\u00edc\u00edch pevn\u00e9 \u010d\u00e1stice je hlavn\u00ed p\u0159\u00ed\u010dinou selh\u00e1n\u00ed t\u011bsn\u011bn\u00ed vniknut\u00ed pevn\u00fdch \u010d\u00e1stic do t\u011bsnic\u00edho povrchu. Pevn\u00e9 \u010d\u00e1stice, kter\u00e9 se dostanou na \u010deln\u00ed plochu t\u0159ec\u00edho p\u00e1ru, p\u016fsob\u00ed jako abraziva a zp\u016fsobuj\u00ed siln\u00e9 opot\u0159eben\u00ed a selh\u00e1n\u00ed t\u011bsn\u011bn\u00ed. P\u0159im\u011b\u0159en\u00e1 mezera mezi t\u011bsnic\u00ed plochou, vyv\u00e1\u017een\u00ed mechanick\u00e9 ucp\u00e1vky a blik\u00e1n\u00ed kapaln\u00e9ho filmu na \u010deln\u00ed plo\u0161e t\u011bsn\u011bn\u00ed jsou hlavn\u00edmi p\u0159\u00ed\u010dinami otev\u0159en\u00ed \u010deln\u00ed plochy a vniknut\u00ed pevn\u00fdch \u010d\u00e1stic.<\/p>\n

6. Net\u011bsnost mechanick\u00e9ho t\u011bsn\u011bn\u00ed zp\u016fsoben\u00e1 chybami v instalaci, provozu nebo v samotn\u00e9m za\u0159\u00edzen\u00ed.<\/strong><\/p>\n

(1) Net\u011bsnost mechanick\u00e9ho t\u011bsn\u011bn\u00ed zp\u016fsoben\u00e1 \u0161patnou instalac\u00ed. Projevuje se p\u0159edev\u0161\u00edm v n\u00e1sleduj\u00edc\u00edch aspektech:<\/p>\n

1) Sty\u010dn\u00e1 plocha dynamick\u00fdch a statick\u00fdch krou\u017ek\u016f je nerovn\u00e1 a p\u0159i instalaci doch\u00e1z\u00ed k jejich otla\u010den\u00ed nebo po\u0161kozen\u00ed;<\/p>\n

2) Dynamick\u00e9 a statick\u00e9 t\u011bsnic\u00ed krou\u017eky maj\u00ed nespr\u00e1vnou velikost, jsou po\u0161kozen\u00e9 nebo nejsou pevn\u011b p\u0159itisknut\u00e9;<\/p>\n

3) Na povrchu dynamick\u00fdch a statick\u00fdch krou\u017ek\u016f jsou ciz\u00ed p\u0159edm\u011bty;<\/p>\n

4) T\u011bsn\u011bn\u00ed ve tvaru V dynamick\u00fdch a statick\u00fdch krou\u017ek\u016f se instaluj\u00ed v opa\u010dn\u00e9m sm\u011bru nebo se jejich hrany p\u0159i instalaci oto\u010d\u00ed;<\/p>\n

5) Na obj\u00edmce doch\u00e1z\u00ed k net\u011bsnosti, t\u011bsn\u011bn\u00ed nen\u00ed nainstalov\u00e1no nebo lisovac\u00ed s\u00edla nen\u00ed dostate\u010dn\u00e1;<\/p>\n

6) S\u00edla pru\u017einy je nerovnom\u011brn\u00e1, jednotliv\u00e1 pru\u017eina nen\u00ed svisl\u00e1 a d\u00e9lky v\u00edce pru\u017ein jsou r\u016fzn\u00e9;<\/p>\n

7) \u010celn\u00ed plocha t\u011bsnic\u00ed dutiny nen\u00ed dostate\u010dn\u011b kolm\u00e1 k h\u0159\u00eddeli;<\/p>\n

8) V aktivn\u00ed \u010d\u00e1sti t\u011bsn\u011bn\u00ed na obj\u00edmce jsou m\u00edsta koroze.<\/p>\n

(2) Hlavn\u00edmi p\u0159\u00ed\u010dinami net\u011bsnosti mechanick\u00e9ho t\u011bsn\u011bn\u00ed b\u011bhem provozu za\u0159\u00edzen\u00ed jsou:<\/p>\n

1) Axi\u00e1ln\u00ed pohyb ob\u011b\u017en\u00e9ho kola \u010derpadla p\u0159ekra\u010duje normu, h\u0159\u00eddel periodicky vibruje, procesn\u00ed provoz je nestabiln\u00ed a tlak v t\u011bsnic\u00ed komo\u0159e se \u010dasto m\u011bn\u00ed, co\u017e zp\u016fsobuje periodickou net\u011bsnost t\u011bsn\u011bn\u00ed;<\/p>\n

2) T\u0159ec\u00ed p\u00e1r je po\u0161kozen\u00fd nebo deformovan\u00fd a nem\u016f\u017ee proch\u00e1zet, co\u017e zp\u016fsobuje net\u011bsnost;<\/p>\n

3) Nespr\u00e1vn\u00fd v\u00fdb\u011br materi\u00e1l\u016f t\u011bsnic\u00edch krou\u017ek\u016f, bobtn\u00e1n\u00ed a ztr\u00e1ta pru\u017enosti;<\/p>\n

4) Velk\u00e1 pru\u017eina nen\u00ed ve spr\u00e1vn\u00e9m sm\u011bru;<\/p>\n

5) Vibrace za\u0159\u00edzen\u00ed jsou b\u011bhem provozu p\u0159\u00edli\u0161 velk\u00e9;<\/p>\n

6) Mezi dynamick\u00fdmi a statick\u00fdmi krou\u017eky a obj\u00edmkou h\u0159\u00eddele se tvo\u0159\u00ed usazeniny, kter\u00e9 zp\u016fsobuj\u00ed, \u017ee pru\u017eina ztr\u00e1c\u00ed svou pru\u017enost a nem\u016f\u017ee kompenzovat opot\u0159eben\u00ed t\u011bsnic\u00ed plochy;<\/p>\n

7) T\u011bsnic\u00ed krou\u017eek je praskl\u00fd atd.<\/p>\n

(3) \u010cerpadlo p\u0159i op\u011btovn\u00e9m spu\u0161t\u011bn\u00ed po ur\u010dit\u00e9 dob\u011b zastaven\u00ed net\u011bsn\u00ed. To je zp\u016fsobeno p\u0159edev\u0161\u00edm tuhnut\u00edm a krystalizac\u00ed m\u00e9dia v bl\u00edzkosti t\u0159ec\u00edho p\u00e1ru, p\u0159\u00edtomnost\u00ed vodn\u00edho kamene na t\u0159ec\u00edm p\u00e1ru a koroz\u00ed a zablokov\u00e1n\u00edm pru\u017einy, co\u017e vede ke ztr\u00e1t\u011b pru\u017enosti.<\/p>\n

7. Selh\u00e1n\u00ed mechanick\u00e9ho t\u011bsn\u011bn\u00ed v d\u016fsledku vysok\u00e9 teploty<\/strong><\/p>\n

1. Tepeln\u00e9 prask\u00e1n\u00ed je b\u011b\u017en\u00fdm jevem poruch vysokoteplotn\u00edch olejov\u00fdch \u010derpadel, jako jsou \u010derpadla na zbytkov\u00fd olej, \u010derpadla na recyklovan\u00fd olej a \u010derpadla na dno atmosf\u00e9rick\u00fdch a vakuov\u00fdch v\u011b\u017e\u00ed. Radi\u00e1ln\u00ed trhliny se objev\u00ed na povrchu krou\u017eku v d\u016fsledku such\u00e9ho t\u0159en\u00ed, n\u00e1hl\u00e9ho p\u0159eru\u0161en\u00ed chladic\u00ed vody, vniknut\u00ed ne\u010distot do t\u011bsnic\u00ed plochy a vakuov\u00e1n\u00ed.<\/p>\n

2. Karbonizace grafitu je jednou z hlavn\u00edch p\u0159\u00ed\u010din selh\u00e1n\u00ed t\u011bsn\u011bn\u00ed p\u0159i pou\u017eit\u00ed uhl\u00edko-grafitov\u00fdch krou\u017ek\u016f. Pokud grafitov\u00fd krou\u017eek b\u011bhem pou\u017e\u00edv\u00e1n\u00ed p\u0159ekro\u010d\u00ed p\u0159\u00edpustnou teplotu (obecn\u011b -105 ~ 250 \u00b0C), vysr\u00e1\u017e\u00ed se na jeho povrchu prysky\u0159ice a prysky\u0159ice v bl\u00edzkosti t\u0159ec\u00ed plochy karbonizuje. Pokud je v n\u011bm pojivo, zp\u011bn\u00ed a zm\u011bkne, \u010d\u00edm\u017e se zv\u00fd\u0161\u00ed net\u011bsnost t\u011bsnic\u00ed plochy a dojde k selh\u00e1n\u00ed t\u011bsn\u011bn\u00ed;<\/p>\n

3. Pomocn\u00e1 t\u011bsn\u011bn\u00ed (nap\u0159. fluorokau\u010dukov\u00e9, EPDM a celopry\u017eov\u00e9) po p\u0159ekro\u010den\u00ed p\u0159\u00edpustn\u00e9 teploty st\u00e1rnou, praskaj\u00ed, tvrdnou a rychle ztr\u00e1cej\u00ed pru\u017enost. V sou\u010dasnosti pou\u017e\u00edvan\u00fd pru\u017en\u00fd grafit m\u00e1 dobrou odolnost proti vysok\u00fdm teplot\u00e1m a korozi, ale jeho pru\u017enost je n\u00edzk\u00e1. Snadno tak\u00e9 prask\u00e1 a p\u0159i instalaci se snadno po\u0161kod\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"

Centrifugal pumps are basically sealed by mechanical seals, while magnetic pumps are sealed by static seal isolation sleeves. There are many types of mechanical seals for centrifugal pumps, and the models vary, but there are five main leakage points: the seal between the sleeve and the shaft; the seal between the dynamic ring and the […]<\/p>","protected":false},"author":4,"featured_media":1439,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[36],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/posts\/1438"}],"collection":[{"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/comments?post=1438"}],"version-history":[{"count":0,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/posts\/1438\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/media\/1439"}],"wp:attachment":[{"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/media?parent=1438"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/categories?post=1438"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/tags?post=1438"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}