Case Studies

Leaking Water Pit

Medical Hospital, New York City

Project Scope

Install a flexible membrane liner in a concrete pit that holds water for a fire suppressant system located in a major medical hospital.


As part of an addition to a major NYC hospital, a pit was built to hold water for the fire suppressant system. The pit was designed with water stops, but the pit leaked into adjacent parts of the hospital. A water resistant coating was applied but it too failed. A second attempt at the applied coating also proved futile.


The architect for the job selected a flexible liner from Witt Lining Systems to line the pit. A Witt Liner isn’t affected by the cracks in the concrete that the applied coating was unable to bridge in the previous attempts to repair the pit. A geotextile padding was installed on the pit walls and floors to protect the liner. The custom liner was fabricated in one piece and shipped to the job site for installation. The pipe penetration in the tank was handled on site by the installation company with a pipe boot supplied by Witt Lining Systems.


Installation of the padding and liner was completed over 3 days. Upon completion, the pit was returned to service. Field reports concluded that no further water was weeping into other rooms as was the case with the failed coating. The finished liner is expected to provide years of worry-free service in the pit

2211 E.L. Anderson Blvd.
Claremore, OK 74017


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Claremore, OK 74018-0488

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Since 1972 we have been the industry leader in providing flexible PVC corrosion resistant liners. Flexible liners are a cost effective alternative to bonded Linings and coatings. Flexible PVC liners are used in plating tanks, chemical tanks, storage tanks, waste water treatment pits, secondary containment, cooling towers, pits, sumps, solar heated water storage tanks, or anywhere liquid containment or corrosion protection is desired.

Industries served include metal finishing, plating, anodizing, aerospace, oil and gas, mining, municipal water treatment, and food and agriculture. Witt offers a variety of materials such as Koroseal®, Spectra Blue® and Exceline®.  Witt Lining Systems also offers alternatives to PVC, custom fabricating Teflon® , Kynar® PVDF , and XR-5® liners. Wiitt offers a variety of liner grades and thicknesses to suit your lining need.  Links

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