DNV-OS-F101 L450 SAWL Bututun Karfe na ƙarƙashin teku: Ƙarfin Masana'antu & Bayanin Samfura

Me yasa Womic Steel don DNV Offshore Pipe?

● Kamfanin DNV GL ya amince da shi don bututun SAWL

● Tsarin UOE tare da O-press mai ƙarfin t 6,000 da kuma faɗaɗa sassa 72 - ovality ≤ 0.15%

● Gwajin CTOD na cikin gida (dakin gwaje-gwajen da CNAS ta amince da shi)

● Babban tarihin aiki tare da ayyukan Tekun Arewa, Brazil, da Yammacin Afirka

● Binciken ɓangare na uku daga DNV, ABS, BV, ko wakilin abokin ciniki

● Cikakken bin ƙa'ida da DNV-OS-F101 (gami da Annex A, B, D kamar yadda ake buƙata)

Tambayoyin da Ake Yawan Yi:

T: Menene bambanci tsakanin DNV-OS-F101 L450 da API 5L X65 na ƙarƙashin teku?
A: An rubuta DNV-OS-F101 musamman don bututun ruwa na ƙasashen waje. Babban bambance-bambance: juriya mai tsauri (0.2% vs 0.5%), gwajin tauri na CTOD na dole (ba API 5L ke buƙata ba), buƙatun tasirin Charpy mafi girma (sau da yawa 50J vs 27J), ƙarin buƙatu don juriyar rugujewa da ƙirar gajiya. Ga ayyukan ruwa mai zurfi, DNV shine ma'aunin da aka fi so.

T: Shin kuna bayar da gwajin CTOD don ƙarfe na walda da HAZ?
A: Eh. Muna yin gwajin CTOD (Crack Tip Opening Displacement) bisa ga BS 7448 ko ASTM E1820. Za mu iya gwadawa a -20°C, -30°C, -46°C, ko kuma kamar yadda aka ƙayyade. Sakamakon da aka saba samu: ƙarfe mai walda δ ≥ 0.35mm, HAZ δ ≥ 0.40mm. Mai binciken DNV ne ya shaida gwajin CTOD.

T: Za ku iya samar da L450 don sabis mai tsami (H₂S)?
A: Eh. Muna samar da L450 tare da ƙarin sabis na tsami kamar yadda aka bayar a cikin DNV-OS-F101 Annex A. Wannan yana buƙatar ƙarancin CEV (≤ 0.40%), ƙarin Mo (0.15-0.25%), PWHT, tauri ≤ 85 HRB, da gwajin HIC/SSC. Mun samar da sabis na tsami L450 ga ayyukan Tekun Arewa da Gabas ta Tsakiya a ƙasashen waje.

T: Menene zurfin ruwa da bututunku zai iya jurewa?
A: Juriyar rugujewa ta dogara ne da rabon D/t (kauri/diamita/bango), ovality, da ƙarfin fitarwa. Ga bututun L450 UOE na yau da kullun tare da D/t = 30 (misali, 610mm × 20mm) da ovality 0.2%, matsin lamba na rugujewa ya wuce 30 MPa (daidai da zurfin ruwa na mita 3,000). Don ruwa mai zurfi, za mu iya tsara bango mai kauri ko ovality mai ƙarfi. Da fatan za a samar da zurfin ruwan ku da matsin lamba na ƙira don nazarin rugujewa.

T: Shin ana buƙatar binciken DNV ga kowane jigilar kaya?
A: DNV-OS-F101 yana buƙatar cewa mai ƙera ya riƙe tsarin inganci da aka amince da shi kuma DNV zai bincika samarwa a wuraren shaida da aka ƙayyade (misali, gwajin hydrostatic, CTOD, duba girma). Ana duba wurin Womic kowace shekara ta DNV. Ga kowane oda, muna haɗa masu binciken DNV don shaida gwaje-gwajen da ake buƙata. Haka kuma za mu iya shirya binciken ABS, BV, ko LR bisa buƙatar abokin ciniki.

T: Menene lokacin jagora na yau da kullun don bututun L450 mai takardar shaidar DNV?
A: Kwanaki 90-120, gami da jadawalin binciken DNV. Lokacin jagora ya dogara da samuwar faranti (faranti TMCP na ƙasashen waje suna da tsawon lokacin jagora, yawanci makonni 10-14). Gwajin CTOD yana ƙara makonni 2-3. Don sake yin oda tare da faranti masu cancanta, ana iya rage lokacin jagora zuwa kwanaki 60-75.

Bayanin Aiki - Bututun Fitar da Iskar Gas Mai Zurfi Na Yammacin Afirka (Tafkin Guinea)

Ƙasa:Yankin bakin teku na Najeriya / Yankin kan iyaka na Equatorial Guinea (Gulf of Guinea)
Daidaitacce & Matsayi:DNV-OS-F101 L450 SAWL (UOE) tare da ƙarin sabis mai tsami
Girma da Adadi:

l OD 610mm (24″) × WT 20.6mm – mita 52,000 (kimanin tan 13,500) wanda aka ƙera ta hanyar tsarin UOE

l OD 610mm (24″) × WT 25.4mm – mita 8,000 (kimanin tan 2,500) wanda aka ƙera ta hanyar tsarin UOE (sashen hawa da hanyar zuwa bakin teku)
Jimilla:Mita 60,000 (kilomita 60), kimanin tan 16,000

Bayani dalla-dalla:Rufin 3LPE na waje (3.2mm) tare da rufin siminti mai nauyin siminti (60mm, yawa 3,050 kg/m³) don samun iska mai kyau. Ƙarshen da aka yanke 30°/1.6mm. Gwajin Hydro a 25.0 MPa (matsin ƙira 18.0 MPa). Zurfin ruwa: 800-1,400m. Charpy mai mahimmanci a -20°C (minti 50J, an cimma 120-180J). CTOD a -20°C: ƙarfe mai walda ≥ 0.25mm, HAZ ≥ 0.30mm (an cimma 0.40-0.65mm). DWTT a -20°C: yankin yanke ≥ 85% (an cimma 90-98%). Ovality ≤ 0.2% (UOE an cimma 0.08-0.15%). Tauri ≤ 85 HRB (sabis mai tsami). HIC ga kowace NACE TM0284: CLR 0%, CTR 0%, CSR 0%. SSC ga kowace NACE TM0177: babu fashewa. 100% UT tare da TOFD, da 25% RT. Binciken ɓangare na uku daga DNV GL a duk lokacin samarwa.

Aikace-aikace:Bututun fitar da iskar gas mai zurfi da ke jigilar iskar gas daga filayen teku (zurfin ruwa mita 800-1,400) zuwa tashar LNG ta bakin teku. Bututun mai tsawon kilomita 60 ya haɗa da sashin babban layin ruwa mai zurfi (kilomita 52, 20.6mm WT), sashin hawan dutse mai ƙarfi (kilomita 4, 25.4mm WT), da kuma hanyar shiga bakin teku ta yankin hawan dutse (kilomita 4, 25.4mm WT tare da rufin siminti). Iskar gas ɗin ta ƙunshi alamar H₂S (5-10 ppm) da CO₂ (3-5%), wanda ke buƙatar cancantar aikin tsami.

Kalubalen Fasaha da Magani:

1. Juriyar rugujewar ruwa mai zurfi (zurfin ruwa na mita 1,400)– Matsin ruwa na waje a mita 1,400 yana da kimanin 14.3 MPa. Matsin ruwa da ake buƙata tare da ma'aunin aminci shine > 25 MPa. Womic ta ƙera bututun UOE mai girman 24″ × 20.6mm tare da D/t = 29.6. Ta amfani da tsarin UOE, mun sami ovality na 0.08-0.12% (ƙasa da iyakar 0.2% na DNV). Mun yi nazarin abubuwa masu iyaka (FEA) da gwajin matsin lamba na rugujewa cikakke akan samfura biyu. An cimma matsin lamba na rugujewa: 27.8 MPa da 28.5 MPa - duka biyun da ke sama.

2. Taurin karyewar CTOD don ƙarfin riser mai ƙarfi– Sashen hawan yana fuskantar nauyin gajiya saboda motsin tasoshin jini da raƙuman ruwa. DNV yana buƙatar gwajin CTOD a -20°C. Womic ta yi CTOD akan ƙarfe na walda da HAZ don bututun WT na 25.4mm. Sakamako: ƙarfe na walda δ = 0.42-0.55mm, HAZ δ = 0.48-0.65mm. Mun kuma samar da lanƙwasa na gajiya na SN don walda mai zagaye don taimakawa kimanta rayuwar gajiyar abokin ciniki.

3. Sabis mai tsami tare da alamar H₂S– Duk da cewa yawan sinadarin H₂S yana da ƙasa (5-10 ppm), aikin ya buƙaci cikakken cancantar yin amfani da tsami saboda matsin lamba mai yawa (18 MPa) da kuma haɗarin tsatsa a yankin. Womic ya yi amfani da ƙananan faranti na sulfur (S ≤ 0.0010%), CEV ≤ 0.38%, ƙarin Mo 0.20%, da PWHT a 580°C na tsawon awanni 1.5. Tauri bayan PWHT: ƙarfe mai tushe 78-82 HRB, walda 80-85 HRB. Gwaje-gwajen HIC da SSC sun wuce ba tare da fasa ba.

4. Rufin siminti mai nauyi da kuma dacewa da 3LPE– Sashen da ke fuskantar bakin teku yana buƙatar rufin siminti mai nauyi (60mm, wanda aka ƙarfafa da ragar ƙarfe) don kwanciyar hankali a ƙasa. An shafa murfin siminti a kan 3LPE tare da wakilin haɗin gwiwa. An haɗa Womic tare da wani fili na musamman a Angola. Mun samar da takardun shaida na gwaji don mannewa da gwajin tasiri. Rufin siminti ya wuce gwajin faɗuwa (faɗuwa ta mita 1, babu tsagewa).

5. Daidaita shigarwa na Reel-lay– An sanya bututun ta amfani da hanyar shimfida reel (an lulluɓe shi a kan jirgin reel). Wannan yana buƙatar sarrafa ovality mai ƙarfi (≤ 0.2%) da tsayin ƙarfafa walda ≤ 0.5mm. Ovality mai sarrafa womic zuwa 0.08-0.15% da murfin walda na ƙasa zuwa ≤ 0.3mm tsayi. Mun yi zagayen kwaikwayon spooling guda 10 a kan bututun gwaji - babu fashewa ko lalacewar ovality.

6. Binciken DNV da takardu– Masu binciken DNV sun shaida gwajin hydrostatic, CTOD, HIC, SSC, da kuma duba girma ga kowane rukuni. Womic ta samar da takardar bayanai mai inganci mai shafuka 1,500 (gami da duk rahotannin gwaji, jadawalin PWHT, rajistan ayyukan UT, da sa hannun mai binciken) cikin makonni 4 da jigilar kaya. An karɓi takardar ba tare da tambayoyi ba.

7. Sakamako:An yi nasarar shigar da bututun mai cikin nasara a kwata na biyu na 2025 ta amfani da jirgin ruwa mai lanƙwasa Deep Constructor. Babu wata matsala a jikin bututu ko kuma katsewar dinkin walda da ta faru yayin spooling, tura shi, ko gwajin bayan kwanciya. Manajan aikin abokin ciniki ya ce: "Sakamakon sarrafa ovality na Womic da sakamakon CTOD ya wuce tsammaninmu. Bututun suna walda akai-akai a filin tare da ƙimar karɓar wucewa ta farko da kashi 98%. Womic Steel yanzu tana cikin jerin masu samar da kayayyaki da aka amince da su don ƙarin ayyukan fitar da iskar gas mai zurfi guda biyu a Yammacin Afirka.

Tuntuɓi:
Yanar Gizo: www.womicsteel.com
Imel: sales@womicsteel.com

Waya / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568

Womic Steel – Abokin hulɗarka mai aminci ga bututun ƙarfe na DNV-OS-F101 L450 SAWL don fitar da iskar gas mai zurfi, hanyoyin kwararar ruwa a ƙarƙashin teku, da tsarin haƙa riser na ƙasashen waje a duk duniya.