STEAM TRAP APPLICATIONS DRIP LEG DESIGN
Figure 1:
Proper DRIP LEG Designs
DRIP LEG DESIGN CRITERIA: 1) Locate prior to valves, bends in pipe (direction changes), low points, end of line and straight piping runs (max. 200 ft. apart). 2) Diameter: • Drip leg diameter (D L ) to be equal to steam main diameter (D) for steam main sizes up to 4” • Drip leg diameter (D L ) may be half the steam main diameter (D) for steam main sizes over 4”, but not less than 4” 3) Length (L): • For systems with automatic start-up, L to be 28” minimum (= 1 PSI minimum head pressure) • For systems with supervised start-up, L to be 1.5 x D L , but not less than 8”
FTT Trap
Strainer
Gate Valve
Drain Valve
DRIP LEG Draining Steam Main
DRIP LEG Before Regulator orControlValve
Isolation Valve
WFT Trap
Strainer
To condensate return line
Drain Valve
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Tel: 610-495-5131 • Pottstown PA • USA •• www.watsonmcdaniel.com
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