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Inflow through Manhole Covers Can Be A Problem
Syracuse Castings’ Flow-Seal Manhole Covers significantly
reduce surface water inflow.
Many manhole covers in service today allow large volumes
of unwanted storm water to flow into the sanitary system.
As evidenced in the illustrations, storm water can and does
penetrate at the cover’s pickholes, vent holes, and at the bearing
seat of the frame. This water can not be separated and must be
treated at the sewage treatment plant. This becomes a very costly
process.
Tests conducted at our foundry prove conclusively that
Flow-Seal covers substantially reduce the inflow of water as
compared to covers of standard design.
Flow-Seal covers have two basic features
- Non-penetrating pickholes
- A 1/4-inch round neoprene gasket fitted into a machined
groove on the underside of the manhole cover.
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New Construction
Flow-Seal Manhole Covers are available for the
majority of manhole frames shown in this
catalog. Specify pattern number for the manhole
frame and cover selected with notation that
Flow-Seal covers are required.
Replacement Manhole Covers
Specify pattern number for cover being
replaced, if available. Also include complete
cover dimensions: C, CC, & X. (See Figure 1 left)
Caution: Existing frame seat, dimension W, must
be a minimum of one (1) inch in width for
Flow-Seal cover to properly seal.
(See Figure 2 left)
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