DHDZ ke tekanyetso ea naha e nang le baetsi ba li-flange tsa molala. Khamphani e na le matla a matla a botekgeniki, e ka rala le ho etsa litlhaloso tse fapaneng tse khethehileng tsa lihlahisoa tse kenyang liphaephe ho latela litlhoko tsa mosebelisi. Ka tlhahlobo ea metallographic, liteko tsa 'mele, tlhahlobo ea lik'hemik'hale, tlhahlobo e sa senyeheng le lisebelisoa tse ling tse tsoetseng pele tsa tlhahlobo le mekhoa.
Baetsi ba li-flange ba ameha haholo ho: gb neck flange, neck flat welding flange, neck butt welding flange, neck non-standard flange le mefuta e meng ea melala ea molala. Setsi sa Iplant se na le palo e kholo ea basebetsi ba mochini oa liphaephe, lisebelisoa tse tsoetseng pele tsa forging le spectral metallography, ho lemoha liphoso, tlhahlobo ea 'mele le ea lik'hemik'hale le lisebelisoa tse ling tse felletseng tsa tlhahlobo, k'hamphani e kenya tšebetsong sistimi ea taolo e tloaelehileng ea boleng. E thehile tsamaiso ea netefatso ea boleng ba saense, mokhoa o phethahetseng oa netefatso ea boleng le theknoloji ea tlhahiso ea mahlale e netefatsa boleng ba sehlahisoa ka nepo.

Baetsi ba DHDZ Flange ba thehile lefapha la taolo ea boleng le setsi sa liteko, tse nang le lisebelisoa tsa liphaephe tse nang le khatello e matla le liphaephe tse mahareng le tse tlase tsa khatello ea lisistimi tse peli tsa liteko, mesebetsi ea liteko e phethiloe, lisebelisoa tsa liteko le lisebelisoa li maemong a machabeng le a malapeng, ho na le tlhahlobo ea bofokoli ba X-ray, ho lemoha ha bofokoli ba ultrasonic, tlhahlobo ea metallographic, tlhahlobo ea lik'hemik'hale, tlhahlobo ea thepa ea mochini, tlhahlobo ea khatello ea metsi le liteko tse ling tsa liteko tsa metsi.
China gb neck flange bahlahisi - ba hapa ka boleng, phaello e nyane empa molao-motheo oa thekiso o potlakileng, o lula o hatela pele, tlholisanong e matla ea 'maraka, ka tšebelisano-'moho e ntle le moea oa ts'ebeletso e tšepahalang ho hapa boholo ba bareki ba tšepa le nts'etsopele e potlakileng. Ho hatela pele, ho lelekisa bokhabane, ho tsoela pele ho ithuta, ho sa khotsofatsoe ke tumelo ea bareki ba rona ea ho theha maemo a win habeli, ho theha bokamoso bo betere.