Steam Line Warm-Up Condensate & Drain Calculator
Calculate startup transient condensate load from pipe steel sensible heat absorption and size drip leg steam traps to prevent catastrophic water hammer.
Steam Main Dimensions & Conditions
8" Sch 40 = 28.55 lb/ft, 6" = 18.97 lb/ft
Recommended: 30 to 60 mins
Recommended: 1 trap every 150-200 ft
Warm-Up Condensate Loads
Total Warmup Condensate:
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Peak Condensate Generation Rate:
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Required Capacity per Steam Trap:
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Steam Saturation Temperature:
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Latent Heat of Evaporation (h_fg):
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Total Pipe Steel Weight:
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Steam Main Startup Condensate Dynamics
During startup, steam entering cold carbon steel lines encounters enormous heat sink capacity. Large quantities of steam condense immediately as latent heat ($h_{fg}$) is released to heat the heavy steel pipe wall to saturation temperature ($T_{sat}$).
Warm-Up Condensate Equation
C_warmup = [ W_pipe · C_p · (T_sat - T_init) ] / h_fg
If drip pockets are undersized or traps cannot evacuate this surge, high-velocity steam ($80 - 150 ext{ ft/s}$) pushes standing water slugs into high-momentum projectiles, causing devastating hydraulic water hammer.