Petroleum-liquid density/viscosity/vapor pressure at a temperature.

Uses a named preset (currently 'diesel_no2', a representative ASTM D975 sample) or a custom fluid via api_gravity + two viscosity points [[T_degC, cSt], [T_degC, cSt]] (ASTM D341 fit) + vapor_pressure_kpa.

Water/steam properties (own IAPWS-IF97 implementation).

Give both pressure and temperature for a single-phase state; only one of them for saturation properties at that pressure or temperature.

Storage-tank working/nominal volume and residence time from autonomy.

Select the smallest ASME B36.10M pipe meeting a velocity limit.

ASME B31.1 pressure-design wall check against a selected schedule.

Darcy-Weisbach + Crane K pressure drop for one liquid pipe segment.

List fitting keys accepted by dp_segment_liquid and their K basis.

Pump total dynamic head from static lift, line losses, and pressures.

NPSH available at the pump; margin check when NPSHr is supplied.

Hydraulic power, and shaft power when an efficiency is supplied.

ISA 75.01 required Cv/Kv for turbulent liquid flow (Fp = 1).

Supply inlet/vapor/critical pressures to enable the choked-flow check (for water use critical_pressure_bar_a = 220.64).