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Opening of Bids - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer
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Opening of Bids - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer
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7/9/2024 2:49:57 PM
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Board of Public Works
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Projects
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7/9/2024
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dissolve the Perkadox 16, use styrene at a minimum of 1.0-2.0 times the weight of <br />Perkadox 16. <br />• For the catalyzation, add the chemicals separately in the following sequential order <br />and mix each chemical 1-2 minutes before adding the next ingredient: <br /> <br />• Perkadox 16/styrene monomer solution or other primary catalyst <br /> <br />• Trigonox KSM or other secondary catalyst <br /> <br />• 1 cc of dye per pound of Perkadox 16 <br /> <br />After the Perkadox 16/styrene monomer/Trigonox KSM solution has been mixed <br />thoroughly, filter the solution with an appropriate screen. The resin & catalyst solution <br />should be mixed for approximately 7-10 minutes. After mixing, obtain a sample for gel <br />time testing and once again measure and record the temperature of the resin and the <br />time. The resin temperature should still be cool (i.e. 55-60ºF), but will probably be slightly <br />increased compared to the original measurement. Once the temperature is verified to be <br />acceptable, pump the resin into the tube. If the resin temperature is greater than 70ºF, <br />take special precautions to ice the tube as it is loaded into the truck. <br /> <br />Note: When mixing in 55-gallon drums, the number of mixes required for any given wet <br />out is often increased and this can lead to errors or mistakes in resin catalyzation. In the <br />event many people get involved with the wet out, delays or equipment failures may <br />distract the wet out supervisor and result in mixing errors. Therefore, it is strongly <br />recommended that the wet out supervisor develop a system for marking the drums as <br />each chemical is added in order to avoid double chemical additions and/or leaving a <br />chemical out. For example, when the Cobalt Naphthenate is added, spray paint a "C" on <br />the drum, when the Trigonox KSM is added, spray paint a "T" on the drum, and a "P" for <br />the Perkadox 16. <br /> <br />RESIN SAMPLING & GEL TIME TESTING <br /> <br />Prior to pumping the resin into the tube, obtain a sample from each drum or every 500 <br />pounds of inline mixer for gel time testing. Gel time testing is strongly recommended in <br />order to verify that the resin has been properly catalyzed and mixed. In addition, <br />performing gel time tests will provide a quality record that may be required by the owner <br />and/or provide the necessary information for solving unanticipated problems that may be <br />encountered during the wet out or in the field. <br /> <br />Pre-heat the water bath between 160-175ºF. For consistent comparison and quality <br />control, heat the water bath to the same temperature every time. Before filling the 50 ml <br />test tubes with resin, position the thermocouple wire within 1 inch of the bottom of the <br />tube. Fill the test tubes with 3.5 inches of resin and immerse into the water bath to a <br />depth of 2.5 inches. Record the rise in temperature and the exothermic event with a chart <br />recorder for your permanent records. After the resin has exothermed and looks <br />consistent with previous gel time test data it can be pumped into the tube for the wet out <br />procedure. After the cure is complete, leave the test tube in the water bath for 10-15 extra <br />minutes to verify that the resin cure rises up the test tube in the 1-inch portion left above <br />the level of water. This type of curing can sometimes simulate the type of cure one might <br />expect in lateral lines or manholes in the presence of water. <br /> <br />
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