1. Bayani na yau da kullun

NACE MR0175/ISO 15156 ita ce ma'aunin da aka amince da shi a duniya don zaɓar kayan ƙarfe don amfani a cikin yanayin samar da mai da iskar gas mai ɗauke da H₂S (mai tsami). An buga tare da NACE International (wanda yanzu shine AMPP) da Ƙungiyar Ƙasa da Ƙasa don Daidaitawa (ISO), gyaran da aka yi a yanzu shine ANSI/NACE MR0175-2021/ISO 15156:2020.

Kafa wannan ma'auni ya samo asali ne daga matsin lamba da masana'antar ke yi wajen zurfafa bincike da kuma albarkatun da ke nesa da teku. Yayin da ci gaban filayen mai da iskar gas ke ƙaruwa, tsatsa da hydrogen sulfide ke haifarwa ya zama mai matuƙar muhimmanci—musamman fashewar damuwa ta sulfide (SSC), wanda zai iya haifar da gazawar ƙarfe mai ƙarfi da ƙarancin ƙarfe, wanda ke haifar da mummunan lamari.

2. Tsarin Daidaitacce da Faɗin

An raba ma'aunin zuwa sassa uku, an haɗa shi zuwa fayil ɗin PDF guda ɗaya, kuma ya haɗa da Da'irori na Fasaha da yawa da aka buga a 2021 da 2022:

Sashe	Faɗin	Babban Abun Ciki
Kashi na 1	Ka'idoji na Gabaɗaya	Yana bayyana yanayi mai tsami, ƙa'idodin zaɓin kayan asali, hanyoyin cancanta
Kashi na 2	Karfe Mai Ƙarancin Carbon da Alloy	Iyakan tauri (≤22 HRC), buƙatun walda, sarrafa sinadarai
Kashi na 3	CRAs da Sauran Kaya	Iyakokin muhalli ga kowace iyali na ƙarfe (zafin jiki, pH₂S, yawan sinadarin chloride)

Wannan ƙa'ida ta shafi kayan aikin da ake amfani da su a masana'antar samar da mai da iskar gas da kuma masana'antar yin amfani da iskar gas inda gazawar ka iya haifar da haɗari ga lafiyar jama'a da ma'aikata ko kuma ga muhalli. Tana magance duk hanyoyin tsagewa da H₂S ke haifarwa, ciki har da SSC, SCC, HIC, SWC, da sauransu.

3. Ma'anar Muhalli Mai Tsami

A bisa ga ƙa'idar, idan matsin lamba na H₂S a cikin yanayin iskar gas ya wuce 0.3 kPa (0.05 psia), ana rarraba muhallin a matsayin mai tsami, wanda ke buƙatar zaɓin abu bisa ga buƙatun ƙa'idar.

Kayan aikin da suka dace sun haɗa da kan rijiyoyin ruwa, bishiyoyin Kirsimeti, tsarin bututu, masu raba ruwa, layukan ruwa a wuraren samar da kayayyaki na sama, da kuma tsarin bututun mai da ke jigilar sinadarin hydrocarbon mai tsami.

4. Bukatun Kayan Aiki Masu Muhimmanci

Karfe Mai Ƙarfe da Ƙaramin Alloy (Sashe na 2)

Karfe mai tushe, ƙarfe mai walda, da taurin HAZ ba dole ba ne ya wuce 22 HRC (248 HV10)

Maganin zafi bayan walda (PWHT) wajibi ne

Ana buƙatar cikakken iko kan sinadarai

Katako Mai Juriya Ga Tsatsa (Kashi na 3)

Kayan da aka fi sani sun haɗa da: SS 316, ƙarfe 6-moly, SS duplex 2507, Alloy 825, Alloy 625, Alloy C-276, da Alloy 400. Kowannensu yana da takamaiman iyakokin muhalli don yanayin zafi, matsin lamba na H₂S, da yawan sinadarin chloride.

5. Muhimman Sabuntawa da Hasashen Nan Gaba

Bugun 2021/2020 ya ci gaba da kasancewa daidai da bugu na 2003, tare da yin gyare-gyare kaɗan ta hanyar Zagayen Fasaha. A cikin 2018, kwamitocin gudanarwa sun amince cewa ya zama dole a sake yin babban rubutu don magance sauƙin amfani da kuma haɗa ci gaban masana'antu.

Ana gudanar da zaɓe da kuma wallafa wani sigar da aka sake rubutawa gaba ɗaya a ISO, wadda aka sake tsara ta zuwa sabbin sassa uku:

Sashe na 1: Bukatun kayan aiki da sarrafawa

Kashi na 2: Kimanta yanayin sabis da zaɓin kayan aiki

Sashe na 3: Bukatun tabbatarwa, cancanta, da kuma zaɓe

Sabuwar sigar ta ba da ƙarin bayani game da hanyoyin gwajin H₂S, gami da jagora kan samfura, zaɓin hanyoyin gwaji, da kuma girman gwajin da ake buƙata don cancantar samfura.

6. Muhimmancin Aiki

NACE MR0175/ISO 15156 yana aiki a matsayin tushen zaɓin abu a cikin haɓaka filin mai da iskar gas. Ma'aunin ya jaddada cewa babu wani bakin ƙarfe da ke da cikakken kariya daga tsatsagewar da ke haifar da chloride - fahimtar iyakokin ƙarfe yana da mahimmanci don zaɓar abu a cikin yanayi mai wahala. Kayan aiki waɗanda ke da saurin lalacewa, kamar bawuloli, kayan aiki, da kayan aiki, suna buƙatar bin ƙa'idar sosai. Duk kayan aikin mai da tsami dole ne su kasance da cikakken bin diddigin su, tare da takaddun shaidar gwajin niƙa waɗanda ke tabbatar da gwajin tauri, bin ƙa'idodin sinadarai, da yanayin maganin zafi.

A cikin yanayin filin mai da iskar gas, zaɓin kayan abu yana bin ƙa'idar NACE MR0175 / ISO 15156. Wannan ma'auni shine "ƙa'idar zinare" don tabbatar da amincin aikin kayan aiki a cikin muhallin da ke ɗauke da hydrogen sulfide (H₂S). Yana rufe duk kayan aiki da abubuwan da ke ɗauke da matsi, daga wuraren rijiyoyi zuwa sassan sarrafawa na ƙasa.

Kayan aikin kan rijiya da na ƙasa: kayan aikin kan rijiya, bututu da igiyoyin casing (bututun samarwa, casing).

Bututun da abubuwan haɗin gwiwa: bututun layi da ake amfani da shi don watsa mai da iskar gas mai nisa, misali,API 5L aji X65 bututun layi, da sauransu.

Kayan aikin sarrafa saman da canja wurin: tasoshin matsi, masu rabawa - kayan aiki masu ɗauke da matsin lamba da ake amfani da su don rabawa da sarrafa mai/gas.

Baya ga samfuran da ke sama, ma'aunin ya kuma ƙunshi nau'ikan kayan aiki daban-daban, gami da ƙarfen carbon, ƙarfe mai ƙarancin ƙarfe, bakin ƙarfe, da ƙarfe mai tushen nickel.