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Blow Down Separators
Separators are sized according to boiler operating pressure & blow-down valve size. Vents are sized to keep internal flash pressures to a maximum of 5 PSI – as recommended by the National Board of Boiler & Pressure Vessel Inspectors and as required by some state and municipal codes.
Key Points:
- Top vent piping to atmosphere should be independent and as direct as possible – and NEVER reduced in size.
- Inlet and piping from the boiler to the separator should always be the same size as the boiler blow-off connection. (If separator is used with more than 1 boiler, inlet and piping from boilers to separator should always be the same size as the largest boiler blow-off connection.
- The drain connection from the separator or aftercooler should have free flow to the sewer, with a minimum number of elbows, etc. Horizontal drain piping must have adequate pitch and long runs should be avoided.
Aftercoolers for Hot Liquids
For required cooling of blow down discharge before entering public sewer, select a W&D AFTERCOOLER for manual or automatic control. Aftercoolers, properly sized for your respective conditions, take care of maximum temperature limitations on wastes entering public sewers to comply with local code(s).
In many cities, blow-off to the atmosphere or an open drain is prohibited. W&D Blow-Down Separators help ensure you are in compliance with local laws. Water, scale and sludge are carried to the sewer through a large drain and at the correct temperature. The flash steam and pressure are absorbed by the baffle plate and vented safely to the atmosphere. |
