استاندارد API مربوط به تولید، پالایش و توزیع نفت خام و محصولات پتروشیمی است که در صنعت پایپینگ به سه بخش اسپک (Spec)، استاندارد (STD) و پیشنهاد فنی (RP) تقسیم‌‏بندی می‏‌شوند.

این استانداردها عبارتند از:

Spec. API 5L: line pipe
Spec. API 6D: pipeline valves
Spec. API 6FA: fire test for valves
Spec. API 12D: field welded tanks for storage of production liquids
Spec. API 12F: shop welded tanks for storage of production liquids
Spec. API 12J: oil & gas separators
Spec. API 12K: indirect type oil field heaters

Std. API 594: wafer & wafer-lug check valves
Std. API 598: valve inspection & testing
Std. API 599: metal plug valves-flanged & butt-welding ends
Std. API 600: steel gate valves-flanged & butt-welding ends
Std. API 602: compact steel gate valves-flanged threaded, welding & extended-body ends
Std. API 603: class 150, cast, corrosion-resistant, flanged-end gate valves
Std. API 607: fire test for soft-seated quarter-turn valves
Std. API 608: metal ball valves-flanged & butt-welding ends
Std. API 609: lug- & wafer-type butterfly valves
Std. API 610: centrifugal pumps for petroleum, heavy duty chemical & gas industry services
Std. API 611: general purpose steam turbines for refinery services
Std. API 612: special purpose steam turbines for refinery services
Std. API 613: special purpose gear units for refinery services
Std. API 614: lubrication, shaft-sealing & control oil systems for special purpose application
Std. API 615: sound control of mechanical equipment for refinery services
Std. API 616: gas turbines for refinery services
Std. API 617: centrifugal compressors for general refinery services
Std. API 618: reciprocating compressors for general refinery services
Std. API 619: rotary-type positive displacement compressors for general refinery services
Std. ApI 620: design & construction of large, welded, low pressure storage tanks
Std. API 630: tube & header dimensions for fired heaters for refinery service
Std. API 650: welded steel tanks for oil storage
Std. API 660: heat exchangers for general refinery service
Std. API 661: air-cooled heat exchangers for general refinery service
Std. API 670: vibrations, axial position & bearing-temperature monitoring systems
Std. API 671: special purpose couplings for refinery service
Std. API 674: positive displacement pumps-reciprocating
Std. API 675: positive displacement pumps-controlled volume
Std. API 676: positive displacement pumps-rotary
Std. API 677: general purpose gear units for refineries services
Std. API 678: accelerometer-base vibration monitoring system
Std. API 1104: welding pipelines and related facilities
Std. API 2000: venting atmospheric & low-pressure storage tanks-non-refrigerated & refrigerated

RP API 530: calculation for heater tube thickness in petroleum refineries
RP API 560: fired heater for general refinery services
RP API 682: shaft sealing system for centrifugal & rotary pumps
RP API 1110: pressure testing of liquid petroleum pipelines
Publ. 941: steel for hydrogen service at elevated temperature & pressures in petroleum refineries & petrochemical plants
Publ. 2009: safe welding & cutting practices in refineries
Publ. 2015: safe entry & cleaning of petroleum storage tanks