28 B3 BPS teret2 · Microsoft PowerPoint - 28_B3_BPS_teret2 Author: Racunalo Created Date: 7/4/2014...
Transcript of 28 B3 BPS teret2 · Microsoft PowerPoint - 28_B3_BPS_teret2 Author: Racunalo Created Date: 7/4/2014...
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4.7.2014
BRODSKI POMOĆNI SUSTAVISustavi na tankerima
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Sustav tereta
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Posušivanje i ocjeđivanje
• sustav s pumpnom stanicom– više tankova na jednu pumpu, posušivanje se vrši
ejektorom ili stapnom pumpom ili vakuum pumpom i odjeljivačem plinova
• sustav s uronjenom pumpom– regulacijom broja okretaja uronjene pumpe i
posebnim cjevovodom
• sustav s bunarskom pumpom– posebnim cjevovodom za posušivanje
(propuhivanjem)
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Smještaj pumpi
• pumpna stanica- sirova n., derivati, OBO
• mini PS- “shuttle t.”, kemikal-tankeri
• strukturna pregrada - “cofferdam”– OBO, kemikal-tankeri
• uronjene i bunarske pumpe- derivati
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Posušivanje i ocjeđivanje
• Prednosti sustava s PS
• Prednosti sustava s UP
- veliki kapacitet i
- različiti pogoni
- manje pokretnih dijelova
- pristup i održavanje
- redundancijaShuttle t. i za većeudaljenosti
- manje pumpne j.
- jednostavna regulacijabroja okr.Veliki broj segregacija
Mogućnostkontaminacije teretauljem iz hidrauličkog s.
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GRUPIRANJE TANKOVA
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
• Annex II Marpol konvencije• Test posušivanja• Sprječavanje povratnog strujanja
- mjerenje količine zaostale vode u usisnomzdencu, pumpi tereta te cjevovodu
- nepovratnim ventilom (klapnom)
- radom pumpe (pokretnim rotorom)
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Posušivanje i ocjeđivanje
- posušivanje inertnim plinom, dušikom ili zrakom
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
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Posušivanje i ocjeđivanje
Količina zaostalih tekućina u usisnom zdencu ovisi o:
- obliku i veličini zdenca
- udaljenosti h (prema slici)
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Posušivanje i ocjeđivanje
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COW - međunarodni propisi
• svrha: nosivost, kalo, okoliš, korozija TT• 1983. - IMO Code for COW systems• od ‘79 tankeri nosivosti 20000 t i postojeći
od 40000 t • djelotvornost: horizontalne 90% direktni
mlaz, okomite 85%• 0,00085% ulja na povr. vode - čist tank
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COW sustav• fiksni cjevovod (nepropusnost)• sigurnosni v. vode na usis PT• odvojenost od prost. posade• strojevi za pranje: promjer mlaznice, radni tlak,
gibanje• p=10,5 bar uz promjer od 25-38 mm daje domet
30-50 m• brzina okretanja 0-3°/min (1,5), a kut elevacije 3°
po okretaju
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Stroj za pranje
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COW - dobava nafte
• “bleed off” metoda• 1 pumpa tereta• recirkulacija nafte (kasnije faze pranja
tankova)
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COW - predostrožnost
• IGS• ispravnost opreme• “suha” nafta (ispuštanje 1-2m)• pridržavanje uputstva• pogodnost nafte za COW (viskozitet ili
točka tečenja)
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Pogodnost nafte
• viskozitet pri temperaturi iskrcaja ne veći od 600 cSt
• temperatura iskrcaja za barem 10 K viša od točke tečenja
• Što ako nije pogodna?
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COW - paluba