Refrigerant Suction Line Sizing & Pressure Drop Calculator
Size suction vapor lines to maintain allowable saturation temperature penalty (≤ 1 K / 2 °F) while ensuring minimum gas velocity for lubricating oil entrainment in vertical risers per ASHRAE.
System Capacity & Refrigerant
Includes elbows and valve allowances
Recommended Suction Line Size & Velocity
Recommended Pipe Size
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Vapor Velocity (v)
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Pressure Drop ΔP
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Sat. Temp Drop ΔT_sat
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Mass Flow Rate ṁ
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ASHRAE Suction Line Design Criteria
Allowable ΔT_sat: ≤ 1.0 K (2.0 °F) | Min Riser Velocity: ≥ 5.0 m/s (1000 fpm) | Max Line: ≤ 20.0 m/s
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