Kiki -livalvecavitation? Oyinza otya okukimalawo?
Tianjin Tanggu Amazzi-okusiba Valve Co., Ltd
Tianjin,CHINA
19th,Omweezi ogwomukaaga,2023. 2023
Nga eddoboozi bwe liyinza okuba n’akakwate akabi ku mubiri gw’omuntu, frequency ezimu ziyinza okuzannya akatyabaga ku byuma by’amakolero nga vvaalu efugira esunsuddwa bulungi, waliwo obulabe obweyongedde obw’okufuuka cavitation, ekijja okuvaako amaloboozi amangi n’okukankana, ekivaamu okwonooneka okw’amangu ennyo ku payipu ez’omunda n’ez’omugga ez’omuggavalve.
Okugatta ku ekyo, amaloboozi amangi gatera okuleeta okukankana okuyinza okwonoona payipu, ebikozesebwa n’ebyuma ebiralaValivanga ekiseera kigenda kiyitawo, okuvunda kw’ebitundu, valve cavitation ereetebwa enkola ya payipu prone okwonooneka okw’amaanyi. Okwonooneka kuno kusinga kuva ku maanyi g’amaloboozi g’okukankana, enkola y’okukulukuta okw’amangu n’okukulukuta okwolekera omutindo gw’amaloboozi amangi ag’okukankana okw’amaanyi amanene okukolebwa okutondebwa n’okugwa kw’ebiwujjo by’omukka okumpi ne wansi w’okukendeera.
Wadde nga kino kitera okubaawo mu mupiiravvaalu eziyitibwa valvesne vvaalu ezitambula mu mubiri, mu butuufu kiyinza okubaawo mu kuddamu okumpi, okw’amaanyi okufaananako n’ekitundu ky’omubiri gwa wafer ekya V-ballvalve, naddalavvaalu z’ebiwujjoku ludda olwa wansi olwa vvaalu ngavalveis stressed mu kifo kimu prone to cavitation phenomenon, ekitera okukulukuta mu valve piping ne welding okuddaabiriza, valve tesaanira kitundu kino ekya layini.
Ka kibeere nti cavitation ebaawo munda mu valve oba wansi w’omugga gwa valve, ebyuma mu kitundu cavitation bijja kwonoonebwa nnyo firimu ultra-thin, ensulo n’ebizimbe bya cantilever ekitundu ekitono, okukankana okunene amplitude kuyinza okuleeta oscillations. Ebifo ebitera okulemererwa bisangibwa mu bikozesebwa nga pressure gauges, transmitters, thermocouple sleeves, flowmeters, sampling systems Actuators, positioners ne limit switches ezirimu springs zijja kwambala amangu, era mounting brackets, fasteners ne connectors zijja kusumululwa ne ziremererwa olw’okukankana.
Fretting corrosion, ebeerawo wakati w’ebintu ebyambala ebiraga okukankana, kya bulijjo okumpi ne cavitation valves. Kino kivaamu okisayidi enkalu nga abrasives okwanguya okwambala wakati w’ebintu ebyambala. Ebikozesebwa ebikoseddwa mulimu isolation ne check valves, nga kwotadde ne control valves,pumps, rotating screens, samplers n’enkola endala yonna ekyukakyuka oba esereba.
Okukankana okw’amaanyi ennyo era kuyinza okwatika n’okukulukuta ebitundu bya vvaalu z’ebyuma n’ebisenge bya payipu. Obutundutundu bw’ebyuma obusaasaanidde oba eddagala erivunda bisobola okucaafuwaza emikutu mu payipu, ekiyinza okuba n’akakwate akanene ku payipu za vvaalu ez’obuyonjo n’emikutu gya payipu egy’obulongoofu obw’amaanyi. Kino nakyo tekikkirizibwa.
Okuteebereza okulemererwa kwa cavitation kwa valve valves kusingako okuzibu era si simply calculated choke pressure drop. Obumanyirivu bulaga nti kisoboka okuba nti puleesa mu mugga omukulu ekka okutuuka ku puleesa y’omukka gw’amazzi nga tebannaba kufuumuuka kwa kitundu mu kitundu n’okugwa kw’ekibumba ky’omukka. Abamu ku bakola vvaalu balagula okulemererwa kw’okuziba kw’enjuba nga tekunnabaawo nga bategeeza okukka kwa puleesa y’okwonooneka okusooka. Enkola y’omukozi wa vvaalu okutandika n’okulagula okwonooneka kw’ebisenge (cavitation damage) yeesigamiziddwa ku kuba nti ebiwujjo by’omukka bigwa, ne bireeta ebituli n’amaloboozi. Kizuuliddwa nti okwonooneka okw’amaanyi mu cavitation kujja kwewalibwa singa eddaala ly’amaloboozi eryabalirirwa liba wansi w’ekkomo eriragiddwa wansi.
Sayizi ya vvaalu okutuuka ku yinsi 3 – 80 dB
Sayizi ya vvaalu ya yinsi 4-6 – 85 dB
Sayizi ya vvaalu yinsi 8-14 – 90 dB
Sayizi za vvaalu za yinsi 16 n’okusingawo – 95 dB
Enkola z’okumalawo okwonooneka kw’ebifo ebiyitibwa cavitation
Dizayini ya valve ey’enjawulo okumalawo cavitation ekozesa split flow ne graded pressure drop:
“Valve diversion” kwe kugabanyaamu okukulukuta okunene mu bukulukuta obutonotono obuwerako, era ekkubo ly’okukulukuta kwa vvaalu likoleddwa mu ngeri nti okukulukuta kukulukuta okuyita mu bifo ebitono ebiwerako ebikwatagana. Okuva ekitundu ky’obunene bw’ekiwujjo ky’ekisenge (cavitation bubble) bwe kibalirirwa okuyita mu kifo ekiggule okukulukuta kwe kuyita. Ekisenge ekitono kisobozesa obuwujjo obutonotono, ekivaamu amaloboozi amatono ate nga tekwonooneka nnyo bwe kituuka ku kwonooneka.
“Graded pressure drop” kitegeeza nti vvaalu ekoleddwa okuba n’ebifo bibiri oba okusingawo eby’okutereeza mu lunyiriri, kale mu kifo ky’okukka kwa puleesa kwonna mu mutendera gumu, etwala emitendera emitonotono egiwerako. Ekitono okusinga okugwa kwa puleesa ssekinnoomu kuyinza okuziyiza puleesa mu kukendeera okugwa puleesa y’omukka gw’amazzi, bwe kityo ne kimalawo ekintu eky’okufuuka ekituli mu vvaalu.
Okugatta diverting ne pressure drop staging mu valve y’emu kisobozesa okulongoosa cavitation resistance by. Mu kiseera ky’okukyusa vvaalu, okuteeka vvaalu efugira ne puleesa ku mulyango gwa vvaalu eba waggulu (okugeza oludda olw’ewala waggulu w’omugga, oba ku buwanvu obwa wansi), oluusi okumalawo ebizibu by’okuzimba ebituli.
Okugatta ku ekyo, okuteeka vvaalu y’okufuga mu kifo ebbugumu ly’amazzi we liri, n’olwekyo puleesa y’omukka entono (nga eky’okuwanyisiganya ebbugumu ku ludda olw’ebbugumu eri wansi) kiyinza okuyamba okumalawo ebizibu by’okuzimba ebituli.
Mu bufunze kiraze nti ekintu ekiyitibwa cavitation phenomenon of valves ddala si kikwata ku degradation performance yokka n’okwonooneka kwa valves. Payipu n’ebikozesebwa wansi mu mugga nabyo biri mu bulabe. Okulagula cavitation n’okukola emitendera okugimalawo y’engeri yokka ey’okwewala ekizibu ky’ensaasaanya ya vvaalu ey’ebbeeyi.
Obudde bw'okuwandiika: Jun-25-2023
