Yadda ake yin Gwajin Mannewa da Gwajin Zagayawa Ruwa | EN877:2021

Bututun ƙarfe da aka jefaAna gwada mannewa da gwaje-gwajen zagayen ruwa mai zafi da sanyi bisa ga EN877, musamman don tantance aminci da dorewar tsarin rufe su na hana lalata, musamman a yanayin aiki na gaske. Waɗannan gwaje-gwajen galibi suna mayar da hankali kan rufin da aka shafa a saman ciki da waje na bututun SML (kamar resin epoxy, polyurethanes, da rufin turmi na siminti). Gwajin manne kai tsaye yana auna ƙarfin haɗin gwiwa tsakanin murfin da ƙarfe na tushe na bututun ƙarfe mai siminti. Gwaje-gwajen zagayen ruwa mai zafi da sanyi suna kwaikwayon canjin zafin jiki na zagaye da bututun ke fuskanta a lokacin amfani da su, suna tantance kwanciyar hankali na dogon lokaci na tsarin rufewa a ƙarƙashin waɗannan matsin lamba na zafi mai canzawa.

Gwajin Mannewa;

Za a duba mannewar murfin ne kawai a kan samfuran da suka fito daga samfuran da aka gama ta hanyar gwajin giciye bisa ga EN ISO 2409, ta wannan hanyar:

• samfurin gwaji: mafi ƙarancin tsawon sashi 100 mm wanda aka yanke daga bututu mai rufi ko kuma dacewa da shi, mafi kyawun girmansa aƙalla DN 100;
• adadin yankewa: 6;
• tazara tsakanin yankewar: 2 mm (3 mm don rufin da ke da mafi ƙarancin kauri da masana'anta suka ƙayyade daidai ko sama da 120 µm);
• Sakamakon zai yi daidai da Tebur 1.

Tebur 1:

Juriya ga zagayowar zafin jiki

Za a yi gwajin ne kawai akan samfuran da aka samo daga samfuran da aka gama. Za a yi amfani da zagaye 1500 na wucewar ruwan zafi da sanyi bisa ga jadawalin da ke ƙasa:

a) (30 + 1) lita na ruwa a zafin jiki na (93 + 2) °C na tsawon minti 1, a daidai lokacin kwararar ruwa,
b) lokacin hutawa da magudanar ruwa na minti 1;
c)(30 + 1) lita na ruwa a zafin jiki na (15 + 5)°C na tsawon minti 1, a daidai lokacin kwararar ruwa,
d) lokacin hutawa da magudanar ruwa na minti 1

Za a auna zafin ruwan a wurin shiga.An bayar da misali na tsarin gwaji na yau da kullun a cikin Hoto na 3.

Bayan dakatar da gwajin, za a wanke bututun da kayan haɗin nan take don kawar da duk wani tabo. Sannan a raba bututun a tsayin daka sannan a duba murfin ciki don ganin matakin ƙuraje da tsatsa wanda bai wuce matakan da ke ƙasa ba:

Matakin ƙuraje: Girma 3, aji 3 bisa ga EN IS0 4628-2:
Matakin tsatsa: Ri 2 bisa ga EN IS0 4628-3.