Manhole Base Liners by Predl Systems
Introducing the GU
Manhole Base Liner
Shope Concrete Products is
proud to introduce the GU Manhole Base Liner from our existing product line. Shope Concrete Products is
a widely known distributor in the Puget Sound area for Predl Systems GU
Liners, previously SealCon. We feel it's important to offer our customers
smart solutions which address today's environmental challenges and
cost effective budgets within commercial, industrial, and residential sectors.
Why use a
GU Manhole Base
About 40% of the
more than 20,000 wastewater systems in the United States are
concrete. Corrosion severely compromises the structural
integrity of these concrete components, costing millions in
corrosion can be expected when septic conditions exist, which
may result in corrosive destruction to concrete bases.
The more turbulent the effluent, the more hydrogen sulfide is
released. This is most common at lift stations and manholes.
This gas collects above the flow line where it combines with
carbon dioxide (C[O.sub.2]). Both of these "acid" gasses produce
a mild, weak acid solution when they dissolve into the sewer's
The solution? The GU
Manhole Base liner is the ultimate containment system for
protecting and increasing the life of your manhole base from
microbial induced corrosion.
has Microbial Induced Corrosion been around?
Concrete Corrosion (MICC) has been apparent in concrete manhole and
related sanitary sewer structures since the mid 1940's and is on the
increase. The hydrogen sulfide issue has been clearly accepted by
utility operators, civil engineers, and the precast concrete
industry. Corrosion in anaerobic and aerobic forms has the capacity
to severely damage concrete manhole structures.
Two forms of Microbial
Corrosion in Concrete
Two forms of MSMA are
responsible for the corrosive action and deterioration of the
concrete structure. One form of MSMA is a process by which hydrogen
sulfide is produced by anaerobic bacteria occurring below the flow
line. This reaction becomes increasingly prevalent in systems with
flat sewer slopes producing oxygen deficient or septic sewage, long
detention times in force mains, wet wells or surcharging gravity
The second form of MSMA is an aerobic process in which oxidized
hydrogen sulfide produces sulfuric acid above the flow line. The
rate of corrosion accelerates due to turbulence created by steep
slopes , high flow velocities, drop connections, hydraulic jumps and
poor channel design affecting riser sections, cones, flat slab
tops and adjustment chimneys.