d slurry pump casing type

Venting of Ejector Sumps | UpCodes

(13) Venting of Ejector Sumps

(a) Size of Vents

The size and length of all vent pipes serving building sanitary ejector sumps shall be determined from, and in accordance with 248 CMR 10.16 (14) _Table 3:_ _Size and Lengths of Sump Vents_.

SIZE AND LENGTHS OF SUMP VENTS 2**Diameter of Drain to Sump 1****Diameter of Vent (inches)** 1 1/4 1 1/2 2 2 1/2 3 4 5 6 8 10 12 2 23 52 290 2 1/2 5 13 89 290 3 2 30 110 290 4 1 17 57 280 5 10 80 280 6 20 97 280 8 3 41 270 10 1 53 250 12 61 230

Note 1:Where more than one drain connects to the sump, size vent on the basis of a drain diameter having a cross sectional area equal to the sum of the areas of the multiple drains. Note 2:The above values provide for a maximum of one-inch pressure drop in the system

(b) Pneumatic Ejector

1. The air pressure relief pipe from a pneumatic ejector shall not be connected to the regular venting system but shall be vented independently to the atmosphere through the roof.

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