API 5Lndiye muyezo wa chitoliro chachitsulo chomwe chimagwiritsidwa ntchito kunyamula mafuta, gasi wachilengedwe, ndi madzi. Muyezowu umaphatikizapo mitundu yosiyanasiyana ya chitsulo, chomwe X42 ndi X52 ndi mitundu iwiri yofanana. Kusiyana kwakukulu pakati pa X42 ndi X52 ndi mawonekedwe awo amakaniko, makamaka mphamvu yotulutsa ndi mphamvu yokoka.

X42: Mphamvu yocheperako ya chitoliro chachitsulo cha X42 ndi 42,000 psi (290 MPa), ndipo mphamvu yake yokoka imayambira pa 60,000-75,000 psi (415-520 MPa). Chitoliro chachitsulo cha X42 nthawi zambiri chimagwiritsidwa ntchito m'machitidwe a mapaipi omwe ali ndi mphamvu yapakati komanso yofunikira, yoyenera kunyamula zinthu monga mafuta, gasi wachilengedwe, ndi madzi.

X52: Mphamvu yocheperako ya chitoliro chachitsulo cha X52 ndi 52,000 psi (360 MPa), ndipo mphamvu yokoka imayambira pa 66,000-95,000 psi (455-655 MPa). Poyerekeza ndi X42, chitoliro chachitsulo cha X52 chili ndi mphamvu zambiri ndipo chimayenera makina a mapaipi omwe ali ndi mphamvu zambiri komanso kupanikizika.

Ponena za momwe zinthu zilili,Muyezo wa API 5Limatchula mikhalidwe yosiyanasiyana yoperekera mapaipi achitsulo chosasunthika ndi mapaipi olumikizidwa:

Chitoliro chachitsulo chopanda msoko (N state): N state ikutanthauza mkhalidwe wokonzanso. Mapaipi achitsulo chopanda msoko amasinthidwa asanaperekedwe kuti agwirizane bwino kapangidwe ka chitoliro chachitsulo, motero amawongolera mawonekedwe ake amakina ndi kulimba kwake. Kukonzanso kumatha kuchotsa kupsinjika kotsalira ndikuwonjezera kukhazikika kwa chitoliro chachitsulo.

Chitoliro cholumikizidwa (M state): M state imatanthauza chithandizo cha thermomechanical cha chitoliro cholumikizidwa pambuyo popangidwa ndi kuwotcherera. Kudzera mu chithandizo cha thermomechanical, kapangidwe ka chitoliro cholumikizidwa kamakonzedwa bwino, magwiridwe antchito a malo owotcherera amawonjezeka, ndipo mphamvu ndi kudalirika kwa chitoliro cholumikizidwa panthawi yogwiritsidwa ntchito zimatsimikiziridwa.

Muyezo wa API 5Limalongosola mwatsatanetsatane kapangidwe ka mankhwala, mawonekedwe a makina, njira zopangira, kuwunika ndi kuyesa zofunikira za mapaipi achitsulo cha mapaipi. Kukhazikitsa muyezowu kumaonetsetsa kuti mapaipi achitsulo cha mapaipi ndi otetezeka komanso odalirika ponyamula mafuta, gasi wachilengedwe ndi madzi ena. Kusankha mapaipi oyenera achitsulo ndi momwe amaperekera zinthu kungakwaniritse zosowa za mapulojekiti osiyanasiyana aukadaulo ndikuwonetsetsa kuti makina a mapaipi akugwira ntchito bwino.