Packaged Metering Manhole Specifications.pdf - Plasti-Fab, Inc.

11. The manhole sides, bottom and external flume sections shall be
designed to withstand a static load of 150 lb/ft per foot (68
kg/305mm) of depth with less than l/4" (6mm) deflection.
12. There shall be no light duty angles of flanges protruding beyond the
flume or manhole that can be damaged by shear or load forces.
13. Inlet and Outlet Pipes: The FRP manhole and flume shall be provided
with _____ inch / millimeter O.D. pipe stubs for connection to
______ inch / millimeter O.D. incoming and outgoing (concrete /
clay / fiberglass / cast iron / PVC) pipe. Flume end adapters shall
allow a smooth flow transition from pipe flow to flume flow.
a. Two neoprene boots with stainless steel clamping bands shall
be supplied and sized to connect inlet and outlet pipe stubs
to the pipeline.
b. Pipe stubs shall have slip flanges for connection to existing line.
14. Cover
a. The Packaged Metering Manhole will be furnished with a
fiberglass cover equipped with heavy duty stainless steel
hinges having l/2" (12mm) diameter hinge pins and
stainless steel hasp for locking. The cover shall be
sufficient strength to withstand 1000 lbs. (454kg) top load.
The cover shall overlap the manhole and seat on a
neoprene seal to prevent dirt, rain and debris from getting
into the manhole.
b. The Packaged Metering Manhole shall have a gastight
aluminum lid for non-traffic loads mounted with a 20" / 24"
(508mm / 610mm) concentric manway.
c. The Packaged Metering Manhole shall have a concentric
manway designed to withstand a 16,000 lb. (7257kg)
vertical dynamic wheel load (H-20), plus lateral forces from
earth loading, ground water and frozen soil. The manhole
opening shall be a (4' (1219mm) diameter barrel use: 22-
1/2" (572mm) I.D or 28" (711mm) I.D. - 5' (1524mm)
diameter barrel use 22-1/2" (572mm) I.D., 28" (711mm) I.D.
or 36" (914mm) I.D.) manway for use with a cast iron cover,
suitable for H-20 highway loading.
d. The Packaged Metering Manhole shall have aluminum hatch
access ____ inch / millimeter x ____ inch / millimeter.
15. Internal Ladder: The ladder rungs shall have a non-slip traction
surface and internal stainless steel safety bar. The ladder shall
meet or exceed OSHA General Industry Standards, Part 1910.27
for "Fixed Ladders".
16. Utility Tap: The manhole barrel shall be fitted with a 2" (51mm) FRP
through-wall utility tap(s) having threaded connections to permit
sub-grade entrance for power, sample or recording lines without
damaging the watertight integrity of the manhole.
17. A l/2” (12mm) thick expanded polystyrene bead board will be supplied
for placement on the concrete slab under the manhole.
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