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Cover Stuck Shut - Hammer Time! Not With CAP. - Video

Click the "Play" arrow to see the vicious attacks on some of our city assets.  This brutal fight can be hazardous and potentially fatal for utility workers.  CAP eliminates unsafe practices and reestablishes the peace. 


Disclaimer: May not represent the performance of all traditional materials, manufacturers, processes, treatments, installations, system types, geographic locations, practices or other conditions.

CAPs Resist Corrosion without Expensive Coatings

Corrosion causes iron manhole covers to break

Corrosion in Wastewater and Grease Traps

Some sewer lids corrode from Hydrogen Sulfide gas exposure, water and salt, which can lead to cover failure in harsh environments.   Improvements in stormwater infiltration prevention have made sewage less dilute, and H2S more concentrated.  Fats, Oils, and Grease (FOG) in grease traps also contribute to severe H2S production. H2S is converted to sulfuric acid by bacteria in the sewer system.

Corroded iron manhole covers show degradation

Corrosion Costs the US Infrastructure..."Big League"

"...the total annual estimated direct cost of corrosion in the U.S. is a staggering $276 billion"  Source: “Corrosion Costs and Preventive Strategies in the United States,” U.S. Federal Highway Administration (FHWA), PUBLICATION NO. FHWA-RD-01-156

See Report Summary by National Association of Corrosion Engineers
Corroded manhole cover with holes and degraded

H-20 Strength...CAPs resist corrosion

In specific wastewater treatment and collection locations with high H2S concentrations (e.g.  lift stations, treatment plants, grease traps, air release valves), CAPs can help maintain that critical H-20 proof load certification. CAPs stay strong even after exposure to caustic environments.

CAPs Extend Product Life in Highly Corrosive Sewers

In sewer systems with high H2S levels, some iron covers can corrode within one year. But cities do not audit manhole covers for traffic strengths after installation. Maybe they should?

CAP Composites Do Not Degrade from H2S Corrosion

Zero Strength Loss!!

University of Texas RGV researchers exposed test bars to extreme levels of H2S in a manhole (2000 ppm).  The CAP material did not weaken after 8 months.   2000 ppm is a very high concentration but does exist in some actual US manholes.

Iron Weakened 30%-50% in 8 months!!!

In this same manhole, UTRGV engineers found that the grey iron test bars lost almost half of their strength after exposed for 8 months.  Results may not reflect all iron manufacturers with various supply sources, processes, treatments, etc.

Municipalities Report Zero Sticking Problems with CAPs

"We Have Not Needed To Hit One Assembly From CAP with a Sledgehammer to Open It"

Many municipalities report that CAP covers have eliminated stuck covers.  When covers stick, municipal workers commonly slam the edges with a sledgehammer or melt it with a flame torch to dislodge the cover from the frame.  CAP assemblies reduce the time, cost, and safety concerns from striking covers with sledgehammers.

It's Hammer Time!

CAP Composites Resist Sticking...Even In Areas with Dirt, Rocks and Debris Accumulation

Municipalities love CAP assemblies....  


"We suffered from stuck...covers frequently." "We found it necessary to use a sledgehammer to loosen the rust and debris between the edge of the cover and frame."


Then, "after having purchased over 500 CAP assemblies over the past three years, we have not needed to hit one...not used any special tools...even where dirt and rocks have accumulated between the cover and frame."


-Jon Hedegard, Director Wastewater Services

Harlingen Waterworks Systems, TX

CAP - "Superior Performance"

"Our operators would strike the cover with a sledgehammer...covers would break and need replacement"


Then, "After seeing the superior performance of the of the CAP product, we decided the CAP composite covers were one of the best options for the City of Chandler at this time."


Alvin Roberston, Superintendent

City of Chandler, AZ

CAP Won't Seal to The Frame!

The cover in this extreme case would not separate from the frame even after cracking and chipping with a sledgehammer.  The municipality had to excavate the entire assembly from the ground and replace it.

CAP Frames Prevent Corrosion Below The Cover

CAP Frames - Support Where You Need It

CAP's Assemblies Don't Fall Down on the Job

CAP's Assemblies Don't Fall Down on the Job

Corroded Frame Ledge - Manhole Covers without support

During a replacement, city workers observed that this traditional cover support on the frame had entirely corroded away revealing why it was "sinking."

CAP's Assemblies Don't Fall Down on the Job

CAP's Assemblies Don't Fall Down on the Job

CAP's Assemblies Don't Fall Down on the Job

When some frames corrode - material flakes off from the frame decreasing support to the cover.  After material loss from the cover and frame simultaneously, the result is predictable.

Durability - Not Just UV Exposure!

Corrosion Affects the Frame and Concrete Below

Corrosion Affects the Frame and Concrete Below

Manhole cover durability above and below cover

Many inquire about the weather resistance while ignoring the more frequent reason for replacements - acid exposure under the cover.

Corrosion Affects the Frame and Concrete Below

Corrosion Affects the Frame and Concrete Below

Corrosion Affects the Frame and Concrete Below

manhole cover corrosion leaves its mark

In some extreme locations, corrosion is so aggressive that remnants of the oxidized iron are left on the concrete below the frame.

CAP Prevents Water Pathways From Metal Loss Due to Corrosion

No Corroded Holes and Gaps with CAP!

Inflow of rainwater into sanitary sewer systems comes from many sections of the collection system.  Holes and gaps in the cover and frame assembly will increase the gallons-per-minute inflow of rainwater, especially in flood situations.  CAPs help eliminate this source of inflow.

Whole Above the Hole

CAP's corrosion resistance will help keep your covers intact resisting inflow.  Corrosion holes permit flow.  

CAP's Avoid Corrosion Fractures-Half a Cover Won't Stop Inflow

CAP's won't crack from corrosion. Mechanical strength degradation on some covers can cause fractures.

Hydrogen Sulfide Gas? No Problem for Composites!

Composites resist corrosion and acids

The material used in CAP's covers is also selected to use in frames and hangers in the electrowinning cathode/anode reaction.  In this copper purification process, copper sheets are held with composite supports inside a sulfuric acid tank.  While the acidic vapor eats through most materials, CAP materials resist the high concentrations of sulfuric acid vapor exposure.  

Durability-both sides of the cover? Just CAP that! ®

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