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Home – OCTG (Oil Country Tubular Goods) – API 5CT OCTG Casing – API 5CT Casing Grade Selector API 5CT Casing Grade Selector Two questions drive grade choice: the load (depth and pressure) and whether the well is sour. Answer both for a starting grade. Depth / pressure class Shallow / low pressure Medium depth / moderate pressure Deep / high pressure Deepest / HPHT Service environment Sweet (no H2S) Sour (H2S present) Wet CO2 / mild sour Recommend Grade — Confirm this grade with an engineer →