| Ultraviolet fiberglass cured in place pipe (CIPP) liner is | | | | division directed the liner company to construct a |
| far superior in many ways to felt pipe lining. | | | | temporary holding pond with an EPDM (ethylene |
| One of the main reasons to use fiberglass liner with | | | | propylene diene monomer) geomembrane liner to |
| UV curing, instead of water or steam cured felt liners, | | | | capture any styrene-laced cure water. The liner |
| is that felt curing causes by-products that negatively | | | | company then had to pump out and haul the water |
| affect the environment. In particular cities using felt | | | | off-site to avoid any environmental contamination. If |
| liners are concerned about flushing styrene-laced | | | | they had used UV fiberglass cured in place pipe, they |
| water into their sewer systems. However UV cured | | | | would not have had this problem causing additional |
| fiberglass pipe lining is environmentally friendly for pipe | | | | time and expense to the job. |
| rehabilitation. | | | | Another advantage to fiberglass cured in place pipe |
| According to a Jan/Feb 2005 article in Stormwater | | | | liner over felt is the curing time. The curing time for felt |
| magazine, when a failed storm sewer pipe 18 miles | | | | liners is 2.5 hours but only 50 minutes for a length of |
| east of Breckenridge, Colorado, was causing a | | | | 300 feet of 8" UV CIPP liner. There is also one to two |
| sinkhole underneath I-70 the Colorado Department of | | | | hours cooling time for felt and zero for fiberglass. |
| Transportation (CDOT) decided to use cured in place | | | | If you look at just the curing speed and the effect on |
| felt liner to repair the pipe instead of replace it. They | | | | the environment, you can already see how UV cured |
| used a polyester felt tube liner, saturated with resin | | | | fiberglass liner makes more sense than using felt. But |
| and coated with a waterproof layer which was | | | | add to that the fact that the fiberglass pipe lining does |
| inserted into the pipe. Hot water or steam was | | | | not shrink (felt shrinks up to 13%, requiring residual |
| circulated through the tube, which hardened the resin. | | | | grouting and lateral seals) and it has a minimum life |
| Because of the styrene-laced by-product of using felt | | | | span of 50 years, you really see how using fiberglass |
| with water or steam curing, the CDOT environmental | | | | CIPP liner is the right choice. |