Ezweni elihlukahlukene lobuchwepheshe bokulinganisa ukugeleza, ama-flowmeter e-Doppler avelele njengesixazululo esikhethekile esenzelwe enye yezinselelo ezivame kakhulu zezimboni: ukulinganisa izinga lokugeleza koketshezi oluqukethe izinhlayiya ezilengayo, amabhamuza, noma izinto eziqinile. Ngokungafani nama-flowmeter e-electromagnetic (adinga uketshezi oluqhubayo) noma ama-flowmeter e-ultrasonic transit-time (athembele kuketshezi oluhlanzekile, olufana), ama-flowmeter e-Doppler avelele ekubaleni ukugeleza koketshezi oluyinkimbinkimbi, olungafani—ikhono eliwenza abaluleke kakhulu ezimbonini ezisukela ekuhlanzweni kwamanzi amdaka kanye nokumbiwa kwemigodi kuya ekucutshungulweni kokudla kanye nowoyela negesi, lapho ama-flowmeter endabuko evame ukwehluleka ngenxa yokungcoliswa koketshezi noma ukungcola. Ngezansi ukuhlolwa okugxile kwezinzuzo zawo ezibalulekile, ukusetshenziswa kwangempela, kanye nokucatshangelwa okubalulekile kokusetshenziswa okuhle, okwenzelwe ukugqamisa inani lawo elisebenzayo ezindaweni zezimboni.
I. Izinzuzo Eziyinhloko: Kungani Ama-Doppler Flowmeters Ephumelela Ezindaweni Eziyinselele
1. Ukusebenza Okungalingani Kuma-Fluids Angafani
Inzuzo ebaluleke kakhulu yama-flowmeter e-Doppler yikhono lawo lokunikeza izilinganiso zokugeleza ezinembile koketshezi olune-turbidity ephezulu, izinto eziqinile ezilengayo, noma amabhamuza aqeqeshwe—izimo lapho ama-flowmeter avamile ehluleka noma ehluleka ngokuphelele.
Ama-flowmeter e-electromagnetic, isibonelo, adinga ukuthi uketshezi lube nomthamo omncane wokuhambisa (ngokuvamile ≥5 μS/cm) futhi lungahlushwa ukuguguleka kwe-liner noma ukuvaleka kwe-electrode uma luvezwa ezintweni eziqinile ngokweqile. Ama-flowmeter e-Ultrasonic transit-time, okwamanje, ancike kuketshezi oluhlanzekile, olungenamabhamuza ukuqinisekisa ukuthi amagagasi omsindo ahamba ngqo phakathi kwama-transducer; ngisho nezinhlayiya ezincane zingasakaza amagagasi, okuholela ekufundweni okungaguquki noma okungalungile.
Ama-flowmeter e-Doppler, ngokuphambene, asebenzisa izinhlayiya noma amabhamuza avimbela obunye ubuchwepheshe ukukhiqiza izimpawu ezinokwethenjelwa. Ezitshalweni zokwelashwa kwamanzi amdaka, lokhu kusho ukuthi angalinganisa kalula ukugeleza kwendle eluhlaza (ecebile ngezinto eziqinile eziphilayo) noma udaka olusebenzayo (olugcwele ama-microbial flocs) ngaphandle kokuvaleka noma ukuwohloka kokunemba. Emisebenzini yezimayini, aphatha udaka oluqukethe amalahle, i-ore, noma isihlabathi—uketshezi olukhukhumezayo kangangokuthi lungabhubhisa izingxenye ezihambayo zama-flowmeter e-turbine noma luqede ama-electrode amamodeli e-electromagnetic. Lokhu kukhethekile kwenza ama-flowmeter e-Doppler abe yisinqumo "esifanele" sezimboni lapho ubumsulwa boketshezi bunganikezwanga khona, futhi ukulinganisa okuqhubekayo kubalulekile ekusebenzeni kahle.
2. Umklamo Ongaphazamisi Unciphisa Isikhathi Sokungasebenzi Nokunakekelwa
Ama-flowmeter amaningi e-Doppler anomklamo ongaphazamisi, okusho ukuthi afakwa ngaphandle kwamapayipi kunokuba afakwe oketshezini. Lo mklamo ususa izindawo eziningana ezibuhlungu kakhulu zama-flowmeter aphazamisile, okuletha izinzuzo zokusebenza ezibonakalayo:
- Akukho Ukuphazamiseka Emisebenzini: Amamodeli angaphazamisi awadingi ukubhoboza, ukusika, noma ukuvalwa kwesistimu ukuze afakwe. Ochwepheshe bamane banamathisele i-transducer epayipini besebenzisa ama-clamp noma ama-adhesive—inqubo ethatha imizuzu, hhayi amahora. Ezindaweni ezinezinqubo ezibalulekile (isb., ama-reactor amakhemikhali, amaphampu amanzi angcolile) angakwazi ukubekezelela isikhathi sokungasebenzi, lokhu kuyishintsho olukhulu. Isitshalo samanzi angcolile sikamasipala esithuthukisa uhlelo lwaso lokuqapha ukugeleza, isibonelo, singafaka amamitha e-Doppler angaphazamisi emapayipini angasese akhona ngaphandle kokuvimba ukusebenza kwephampu, sigweme ukuphazamiseka kwensizakalo okubizayo emiphakathini yendawo.
- Ingozi Yokungangcoliswa Noma Yokuvuza: Njengoba i-transducer ingalokothi ithinte uketshezi, ayikho ingozi yokungenisa izinto ezingcolisayo—inzuzo ebalulekile ekusetshenzisweni kokudla, kwezemithi, noma kwe-semiconductor lapho ukuhlanzeka komkhiqizo kungaxoxiswana ngakho. Iphinde isuse ingozi yokuvuza, okuyinkinga enkulu yokuphepha lapho kulinganiswa uketshezi oluyingozi njenge-acids, ama-hydrocarbon, noma amakhemikhali anobuthi.
- Impilo Yesevisi Ende Enokugcinwa Okuncane: Ama-flowmeter aphazamisayo abhekene noketshezi olunamandla, ukugqwala, kanye nokushintshashintsha kwengcindezi, okuholela ekushintsheni kwezingxenye njalo. Amamodeli e-Doppler angaphazamisi, ngokuphambene, awanazo izingxenye oketshezini, ngakho-ke impilo yawo yesevisi ivame ukunwebeka eminyakeni eyi-10-15. Ukugcinwa njalo kunqunyelwe ekuhlanzweni kwe-transducer njalo (ukususa uthuli noma imfucumfucu) kanye nokuhlolwa kokulinganisa—okuncane kakhulu kunokugcinwa okudingekayo kwezinye izindlela zemishini noma eziphazamisayo.
3. Ukuphumelela Kwezindleko Zezicelo Ezikhethekile
Nakuba ama-flowmeter e-Doppler engeyona inketho eshibhile yokulinganisa uketshezi oluhlanzekile (isikhathi sokuthutha se-ultrasonic noma amamitha omshini angabizi kakhulu ezimweni ezinjalo), anikeza inani elimangalisayo lezindleko zezinhlelo zawo eziqondiwe—lezo ezihilela uketshezi oluyinkimbinkimbi, olugcwele izinhlayiya. Amandla awo okubekezelela izimo ezinzima aqeda isidingo sokushintsha amamitha njalo, okuyizindleko ezinkulu zezikhungo ezithembele kubuchwepheshe obungafanele.
Cabanga ngenkampani yezimayini elinganisa ukugeleza kodaka lwensimbi: i-turbine flowmeter ingadinga ukushintshwa kwe-blade njalo ezinyangeni ezi-3-6, ibiza izinkulungwane zamaRandi ngezingxenye kanye nomsebenzi minyaka yonke. I-Doppler flowmeter, ngokuphambene nalokho, ingasebenza iminyaka eminingi ngokulungiswa okuncane, inciphise izindleko zomjikelezo wokuphila ngo-50% noma ngaphezulu. Ngaphezu kwalokho, ukufakwa okungaphazamisi kunciphisa izindleko zabasebenzi uma kuqhathaniswa namamitha okuphazamisayo, adinga ukusika amapayipi, ukushisela, kanye nokuhlolwa kwengcindezi. Kumabhizinisi amancane kuya kwaphakathi (ama-SME) ezimbonini ezifana nokucubungula ukudla (ukulinganisa i-fruit pulp noma i-chocolate slurry) noma ukwelashwa kwamanzi angcolile, ama-Doppler flowmeter ahlinzeka ngesisombululo esingabizi kakhulu esigwema izindleko eziphezulu zamamitha kagesi akhethekile noma e-Coriolis ngenkathi eqhubeka nokunikeza ukusebenza okuthembekile.
4. Ukuguquguquka Kuzo Zonke Izinto Zombhobho
Ama-flowmeter e-Doppler anikeza ukuguquguquka okungenakuqhathaniswa uma kukhulunywa ngobukhulu bepayipi nezinto zokwakha, okwenza afaneleke kakhulu ekusethweni kwezimboni okuhlukahlukene:
- Ububanzi Bosayizi Wepayipi: Zingasetshenziswa ngamapayipi asukela ku-0.5 inches (emigqeni yokucubungula ukudla encane) kuya ku-120 inches (emigoqweni emikhulu yamanzi amdaka kamasipala), okususa isidingo sokuthola izinhlobo eziningi zamamitha ezingxenyeni ezahlukene zesakhiwo.
- Ukuhambisana Nezinto Ezihlukahlukene: Zisebenza kahle ngamapayipi enziwe ngensimbi, i-PVC, ithusi, ukhonkolo, noma i-fiberglass. Amamodeli angaphazamisi asebenzisa ama-transducer alinganiswe ngobukhulu bepayipi nezinto ezihlukene, okuqinisekisa ukudluliswa kwesignali okuthembekile ngisho nangepayipi lensimbi ejiyile noma elingelona elensimbi.
Lokhu kuguquguquka kubaluleke kakhulu ezimbonini ezinezinhlelo ezahlukene zamapayipi. Emkhakheni kawoyela negesi, isibonelo, amamitha e-Doppler angalinganisa uwoyela ongahluziwe emipayipini emikhulu yensimbi kanye nemikhiqizo ecolisisiwe emigqeni emincane ye-PVC. Ekucubungulweni kokudla, aqapha utamatisi onamapayipini ensimbi engagqwali kanye nenhlama ebhakedeni emapayipini epulasitiki. Ngokungafani namamitha okugeleza kagesi, avame ukudinga ama-liners akhethekile ukuvimbela ukugqwala, amamitha okugeleza e-Doppler asebenza ngamapayipi angafakwanga umugqa, okunciphisa kakhulu izindleko zokufaka kanye nobunzima.
II. Izicelo Zomhlaba Wangempela: Izimboni Eziguqulwe Yi-Doppler Flowmeters
1. Ukwelashwa Kwamanzi Angcolile Nokuqapha Imvelo
Ama-flowmeter e-Doppler ayinto ebalulekile ezitshalweni zokwelashwa kwamanzi amdaka (WWTPs) emhlabeni jikelele, abhekana nezinselele eziyingqayizivele zokulinganisa indle, udaka, kanye nokungcola:
- Ukuqapha Indle Engavuthiwe: Amamitha e-Doppler angaphazamisi alandelela ukugeleza kwendle engenayo kuma-WWTP, aqinisekisa ukuthi amaphampu anosayizi wokusingatha ukugeleza okuphezulu (isb., ngemva kwezimvula ezinkulu) futhi avimbele ukugcwala. Lolu lwazi lubalulekile ekwenzeni ngcono ukusetshenziswa kwamandla ephampu nokugwema umonakalo wengqalasizinda obizayo.
- Ukuphathwa Kodaka Olusebenzayo: Amamitha e-Doppler angenelelayo—ahlonyiswe ngama-transducer aqinile, amelana nokugqwala—alinganisa ukugeleza kodaka ematangini okungenisa umoya. Lokhu kusiza abashayeli ukulungisa amazinga omoya-mpilo kanye nomsebenzi wamagciwane, ukuqinisekisa ukususwa okuphumelelayo kwezakhamzimba (i-nitrogen ne-phosphorus) kanye nokuhambisana nezindinganiso zemvelo.
- Ukuthobela Ukukhishwa Kwendle: Amamitha e-Doppler aqapha ukugeleza kwendle ephathwayo emifuleni noma olwandle, enikeza idatha yokufakazela ukuhambisana nemithetho efana noMthetho Wamanzi Ahlanzekile wase-US noma i-EU's Urban Wastewater Treatment Directive. Emazweni asathuthuka njenge-India noma i-Brazil, lapho ingqalasizinda yamanzi angcolile ivame ukucindezelwa khona, le datha isiza izikhungo zokusiza ukuthi zibeke phambili ukutshalwa kwezimali emandleni okwelapha, ukunciphisa ukungcola kanye nokuvikela impilo yomphakathi.
2. Ukumbiwa Nokucubungula Izimbiwa
Imboni yezimayini ithembele kakhulu kuma-flowmeter e-Doppler ukukala ukugeleza kwama-slurries—izingxube zamanzi namaminerali aqinile (amalahle, i-ore yethusi, i-ore yegolide) arhabaxa futhi angcolile kakhulu:
- Ukuthuthukiswa Kokuthutha Okune-Slurry: Amamitha e-Doppler aqapha ukugeleza kwe-slurry ye-ore emapayipini asuka ezimayini aye ezitshalweni zokucubungula, aqinisekise ukulethwa okuqhubekayo futhi avimbele ukuvaleka kwamapayipi (okungabangela isikhathi sokungasebenzi esibiza u-$10,000 noma ngaphezulu ngehora). Aphinde asize ukulungisa isivinini sephampu ukuze kuncishiswe ukusetshenziswa kwamandla ngenkathi kugcinwa ukukhishwa kwamandla.
- Ukuphathwa Kwezinsila: Izimayini zisebenzisa amamitha e-Doppler ukukala ukugeleza kwezinsila (imfucuza) emachibini okugcina izinto, ukuqinisekisa ukulandelwa kwemithetho eqinile yezemvelo evimbela ukukhishwa kwezinsila. Lokhu kuvimbela ukungcoliswa kwenhlabathi namanzi, okuyinkinga enkulu emisebenzini yezimayini ezindaweni ezizwela kakhulu emvelweni.
- Ukuqapha Ukuvuza Kwezinto Eziphilayo: Emisebenzini yokuvuza izinto ezifile (esetshenziselwa ukukhipha igolide noma ithusi), amamitha e-Doppler alandelela ukugeleza kokuvuza okufile okubangelwa yi-acidic ngokusebenzisa izinqwaba zamaminerali. Lolu lwazi lusiza ekwenzeni ngcono ukulinganisa kwamakhemikhali, luthuthukise amazinga okubuyisa insimbi kanye nokunciphisa inani lamakhemikhali angcolile.
Ezimayini zensimbi zase-Australia, isibonelo, ama-flowmeter e-Doppler angaphazamisi afakwa kumapayipi ensimbi angama-intshi angu-48 athwala udaka lwensimbi. Asebenza ngokwethembeka emazingeni okushisa aphezulu (-10°C kuya ku-50°C) kanye nezimo ezinothuli, eletha idatha ehambisanayo ngisho nasezindaweni zokumba ezinzima kakhulu.
3. Ukucubungula Ukudla Neziphuzo
Ama-Doppler flowmeter afanele ukusetshenziswa kokudla neziphuzo okubandakanya uketshezi oluqinile, olugcwele izinhlayiya—lapho inhlanzeko nokunemba kubaluleke kakhulu:
- Ukucutshungulwa Kwezithelo Nemifino: Zilinganisa ukugeleza kwe-pulp yezithelo (isb., utamatisi, i-apula, noma umango) emapayipini ensimbi engagqwali, ukuqinisekisa ukukala okunembile ushukela, izithako zokugcina ukudla, noma izinongo. Lokhu kuvumelana kuyisihluthulelo sokugcina ikhwalithi yomkhiqizo kuwo wonke amaqoqo.
- Ubisi kanye ne-Confectionery: Amamitha e-Doppler aqapha ukugeleza kwe-chocolate slurry (nge-cocoa solids) noma i-yogurt (enezingcezu zezithelo) ngaphandle kokungcolisa umkhiqizo. Ukwakheka kwawo okungaphazamisi kuhambisana nezindinganiso zokuhlanzeka eziqinile njenge-FDA (US) kanye ne-EU 10/2011, ezivimbela ukuxhumana phakathi kwamadivayisi okulinganisa nemikhiqizo yokudla ngaphandle kokuthi kuhlanzwe ngokuphelele.
- Ubhiya: Emafektri obhiya akhiwe ngezandla, amamitha e-Doppler alinganisa ukugeleza kwe-wort (ngezinhlayiya ze-malt ezilengisiwe) ngesikhathi sokubilisa. Lokhu kusiza abenzi bobhiya ukulawula umsebenzi wemvubelo kanye nokuqukethwe kotshwala, ukuqinisekisa ukuthi ibhetshi ngayinye kabhiya ihlangabezana nokunambitheka kanye nezimpawu zamandla.
Ama-flowmeter amaningi e-Doppler asezingeni lokudla aqukethe ama-transducer ensimbi engagqwali kanye nezilinganiso zokuvikelwa kwe-IP69K, okwenza amelane nokuhlanza okunamandla ngamakhemikhali okuhlanza abangela ukucindezeleka okukhulu—okubalulekile ekugcineni ukuphepha kokudla ezindaweni zokucubungula ezimatasa.
4. Amafutha kanye negesi kanye namakhemikhali kaphethroli
Emkhakheni kawoyela negesi, ama-Doppler flowmeter axazulula inselele yokulinganisa uketshezi ngegesi noma izinto eziqinile eziqeqeshwe kahle—ezivame kakhulu emisebenzini ephezulu (yokukhipha) kanye neyephansi (yokuhlanza):
- Ukulinganiswa Kwamafutha Angcolile Okuphezulu: Balinganisa ukugeleza kukawoyela ongahluziwe kusuka emithonjeni kuya emipayipini, evame ukuqukethe izinhlayiya zesihlabathi kanye namabhamuza egesi yemvelo. Amamitha e-turbine endabuko angalimala yisihlabathi, kuyilapho amamitha e-Doppler engazinaki amabhamuza futhi asebenzise isihlabathi ukukhiqiza isignali ethembekile. Lokhu kuqinisekisa ukulinganiswa okunembile komthamo wokukhiqiza, okubalulekile ekulandeleni imali engenayo.
- Ukuhlanganisa Uphethiloli Ongaphansi: Ezindaweni zokuhluza, amamitha e-Doppler aqapha ukuhamba kwamafutha asindayo (isb., uphethiloli we-bunker) noma amafutha okugcoba anokungcola okulengayo. Aqinisekisa ukuhlanganiswa okunembile kwezithasiselo, esiza izindawo zokuhluza ukuhlangabezana nezindinganiso zekhwalithi kaphethiloli (isb., imininingwane ye-ASTM International) futhi agweme ukubuyiswa kwemikhiqizo okubizayo.
- Ukutholwa Kokuvuza Kwepayipi: Amamitha e-Doppler angaphazamisi afakwe ngezikhathi ezithile eceleni kwamapayipi aqhathanisa amazinga okugeleza phakathi kwamaphuzu. Ukwehla okungazelelwe kokugeleza kubonisa ukuvuza, okubangela izexwayiso ezizenzakalelayo kumaqembu okulungisa. Lokhu kutholwa kusenesikhathi kunciphisa umonakalo wemvelo kanye nokulahlekelwa yizimali—okubalulekile lapho kuthuthwa ama-hydrocarbon ayingozi.
Ezindaweni zikawoyela zaseMpumalanga Ephakathi, ama-flowmeter e-Doppler asebenza ezimweni zasehlane ezibucayi (amazinga okushisa afinyelela ku-60°C) kanye namapayipi anomfutho ophezulu (afinyelela ku-10,000 psi), okubonisa ukuqina kwawo ezindaweni zezimboni ezidinga kakhulu.
III. Izinto Ezibalulekile Okufanele Zicatshangelwe Ukuze Kusebenze Kahle
Nakuba ama-flowmeter e-Doppler ephumelela kakhulu ezimweni ezinzima, anemikhawulo okumele ixazululwe ukuqinisekisa ukulinganisa okunembile nokuthembekile:
- Ukugxila Okuncane Kwezinhlayiya: Ama-Doppler flowmeter adinga okungenani izingxenye eziyi-100 ngesigidi (ppm) sezinhlayiya ezilengayo noma amabhamuza ukuze akhiqize isignali ethembekile. Kuketshezi oluhlanzekile (isb., amanzi ahlanzekile, utshwala obucwengekile), azokhiqiza ukufundwa okunganembile noma angabi nasignali nhlobo. Kulezi zinhlelo zokusebenza, isikhathi sokudlulisa se-ultrasonic noma amamitha kagesi ayizinketho ezingcono.
- Usayizi Wezinhlayiya Nejubane: Izinhlayiya kumele zibe nkulu ngokwanele (≥10 μm) ukuze zibonise izimpawu ngempumelelo futhi zihambe ngesivinini esifanayo noketshezi. Ezinhlayiya ezinezinhlayiya ezincane kakhulu (isb., ukumiswa kwe-colloidal) noma izinhlayiya ezihlala (isb., isihlabathi esinzima emanzini ahamba kancane), ukufundwa kungase kungabi okuzinzile. Ukuhlola amasampula oketshezi ngaphambi kokufakwa kungasiza ukuqinisekisa ukuhambisana.
- Ubukhulu Bodonga Lwepayipi Nezinto Ezisetshenziswayo: Amamitha e-Doppler angaphazamisi ahlushwa amapayipi aminyene kakhulu (≥2 amayintshi) noma izinto ezincipha kakhulu (isb., insimbi eboshwe nge-lead), njengoba izimpawu zingase zingangeni odongeni ngokwanele. Abakhiqizi bavame ukunikeza iziqondiso zamapharamitha epayipi ahambisanayo—ukukhetha i-transducer elinganiswe kahle yepayipi lakho elithile kuqinisekisa ukusebenza kahle.
- Ukuphazamiseka Kwephrofayili Yokugeleza: Izithiyo ezifana nezindololwane, amavalvu, noma amaphampu angaphezulu komfula wemitha zingadala ukugeleza okuguqukayo, okubangela ukuthi izinhlayiya zihambe ngesivinini esingaguquki. Ukuze unciphise lokhu, faka imitha okungenani ububanzi bepayipi obuyi-10 ngaphansi kwezithiyo kanye nobubanzi bepayipi obuyi-5 phezulu komfula wengxenye elandelayo. Lokhu kuqinisekisa iphrofayili yokugeleza okuzinzile kanye nokufundwa okunembile.
Ngokubhekana nalezi zici—njengokuqinisekisa ukuhlushwa kwezinhlayiya noma ukulungisa indawo yemitha—abasebenzisi bangakhulisa ukunemba nokuthembeka kwama-flowmeter e-Doppler, baqinisekise ukuthi aletha inani elihambisanayo iminyaka.
Isiphetho
Ama-flowmeter e-Doppler anendawo eyingqayizivele nebalulekile kubuchwepheshe bokulinganisa ukugeleza, enikeza ukunemba okukhethekile ezimweni ezinzima kakhulu zoketshezi. Amandla awo okusingatha uketshezi olungafani, oluhlabayo, noma olugcwele amabhamuza—oluhlanganiswe nokufakwa okungaphazamisi, ukusebenza kahle kwezindleko, kanye nokuguquguquka—awenza abaluleke kakhulu ezimbonini ezifana nokwelashwa kwamanzi amdaka, ukumbiwa kwezimayini, ukucubungula ukudla, kanye namafutha negesi. Nakuba engeyona ikhambi “elifanelana nosayizi owodwa” (uketshezi oluhlanzekile ludinga obunye ubuchwepheshe), indima yawo ekuxazululeni izinkinga zokulinganisa eziyinkimbinkimbi ayinakweqiswa.
Njengoba izimboni ziqhubeka nokubhekana nemithethonqubo eqinile yezemvelo, izidingo eziphezulu zokusebenza kahle, kanye nezidingo zokuphatha uketshezi eziyinkimbinkimbi, ama-flowmeter e-Doppler azohlala eyithuluzi elibalulekile. Intuthuko kwezobuchwepheshe—njengezindlela zokucubungula isignali ezithuthukisiwe (ukusingatha amazinga aphansi ezinhlayiya) kanye nokuxhumana okungenantambo (kokuqapha kude)—zandisa amakhono azo, okwenza abe yigugu nakakhulu emisebenzini yezimboni yesimanje. Kungakhathaliseki ukuthi ukulinganisa indle esitshalweni samanzi angcolile edolobheni, i-ore slurry epayipini lezimayini, noma ushokoledi efektri ye-confectionery, ama-flowmeter e-Doppler afakazela ukuthi ubuchwepheshe obukhethekile buvame ukuba yisihluthulelo sokuxazulula izinselele zezimboni ezicindezela kakhulu.
Isikhathi sokuthunyelwe: Septhemba-02-2025