HYDRAULIC ANALYSIS OF PIPE LINED WITH MADISON S 100% SOLIDS STRUCTURAL POLYURETHANE COATINGS

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2 An example of the hidden costs is the pump efficiency, which is related to the water/wastewater flow efficiency. Because Madison s 100% solids structural polyurethanes have better abrasive resistance and is smoother than cement-mortar and other lining materials, the pump efficiency of pipes lined with Madison s polyurethane coatings is significantly higher than the case of other lining materials. This paper gives out detailed hydraulic and friction analysis of various pipes lined with Madison s 100% solids structural polyurethane coatings. 2. Fundaments of hydraulic analysis While conducting hydraulic analysis on pipes lined/coated with a coating, it is important to understand how water is going to flow through the piping and the loss associated with this flow. The primary loss of energy is due to the friction between the fluid and the pipe wall. The flow is converted to waste heat, drop in pressure in a pipeline is observed, and the energy is lost. Illustrations made by Dan Lundy 1 are very helpful to help one understand the basic terminology of hydraulic analysis. Consider Figure 1 below. With the pump "on" but the hydrant valve closed, the pump simply produces pressure with no flow. The pressure all along the horizontal pipe is 60 psi. This is the "shutoff head" for this pump. Figure 1. Shutoff head, courtesy of Dan Lundy 1 Consider then if the pump is "on" and the hydrant valve is open. As water flows through the pipe, valves and fittings, the interaction of the liquid with the pipe walls will produce turbulence and friction resistance, which results in the loss of energy or "head" (Figure 2). Water flowing through a closed pipe will experience irreversible loss of pressure or "headloss.

5 3. Friction and hydraulic headloss of pipes lined with Madison s 100% solids structural polyurethane coatings For any pipeline internal lining application, the lining must be able to withstand the constant flow of liquid and any particulates. Normal municipal pipeline velocities are in the range of 8 to 16 feet per second (2 to 4 meters per second) but these rates can increase in some cases to over 30 feet per second. The corrosion protection lining must be capable to withstand the constant abrasion caused by the passing water at the various velocities. Premature failure of the lining system can occur thereby exposing the steel substrate to the corrosion cycle. ASTM D4060 is a commonly used testing method for measuring the abrasion resistance of a coating system. The Taber Abrasion Test (ASTM D4060) rotates a sample under a specific weight against a grinding wheel for a defined number of revolutions. The samples are evaluated by measuring the weight of the sample before and after the abrasion. The resulting weight loss indicates the comparative ability of the lining to resist abrasion and wear. The lower the reported weight loss, the more abrasion resistant the lining. Table 1 summarizes the abrasion resistance testing results of a typical Madison s 100% solids structural polyurethane lining material, comparing with other solvent based or 100% solids epoxy linings as well as cement-mortar systems. The 100% solids polyurethane lining demonstrated superior abrasion resistance. This parallels what is already known in the industry that polyurethanes offer excellent abrasion resistance. The solvent based and 100% solids epoxy lining systems offered moderate abrasion resistance. The cement-mortar system samples illustrated the inherent nature of cement-based products to wear away at an accelerated rate in environments that are subject to fast velocities. However, with cementitious linings, the abrasion resistance can vary widely depending on the type and amount of aggregate. Table 1 Abrasion Resistance Results Product Type Solvent Amine Based Epoxy 100% Solids Epoxy Madison s 100% Solids Polyurethane Cement Mortar Average Weight Loss 122 mg loss 183 mg loss 50 mg loss 1500 mg loss For a pipe to have satisfactory flow characteristics, it initially must provide a high Hazen- Williams flow coefficient C factor and must be able to maintain a high flow coefficient through years of service. The capability of a lining system to maintain a high flow coefficient is correlated with its ability resisting to deterioration due to abrasion or other

6 physical/chemical attack. The higher resistances to deterioration, the better the capability can a lining have to maintain the high flow coefficient. Numerous flow tests have been conducted to demonstrate how well various pipe lining materials meet these requirements. The average value of C factor for new cementmortar lined pipes was found to be 144, although some tests reported values from 150 to 157. For older systems, the average value of C factor was found to be 140. As a result, it is commonly accepted by the pipe industry that a C factor of 140 for cement-mortar linings is a realistic and long-term value. 2 Tests have also been conducted and reported by third parties, including a world s leading pipe manufacturer, on the abrasion resistance and flow coefficient of pipes lined with Madison s 100% solids structural polyurethane coating systems 3. It showed that the Madison s linings will provide a tough abrasion resistant interior that will resist erosion from sand or grit particles being carried in suspension. Also the pipes and fittings lined with the Madison s polyurethane materials can produce and maintain a smooth interior of pipe surface to which most materials will not adhere, having a Hazen-Williams C factor of 150. For a specific set of conditions, such a Hazen-Williams C factor of 150 is approximately equal to a Manning n coefficient of Effluent line 4 mile steel pipeline Average speed of 10 ft/sec Temperature: 140 o F/60 o C. Lining: Madison s 100% solids rigid PU Production: 16,000 ft 2 /12hr shift Figure 4 A smooth and abrasion resistant interior pipe surface for high aggressive and high slow rate applications with a Madison s 100% solids structural polyurethane product Typical minimum specified dry film coating thickness of Madison s 100% solids structural polyurethane coatings for water/wastewater applications is given in Table 2, depending on the condition of substrate. In contrast, most other lining materials such as cement mortar, polyethylene, and/or 100% solids polyurea are applied at a much thicker dry film thickness than Madison s 100% solids structural polyurethane products, hence the actual inside diameter of the pipes lined with theses other materials is much smaller. The combination of high flow coefficient with a larger inside diameter provides

7 exceptionally high flow capacities of pipes lined with Madison s 100% solids structural polyurethane lining materials. Table 2 Typical minimum specified dry film coating thickness of Madison s 100% solids structural polyurethane linings for water/wastewater interior applications Substrate Type Madison s 100% solids structural polyurethane linings External Application Steel 25 mils (625 microns) normal 25 mils (625 microns) normal 50 mils (1250 microns) - slip bore Ductile iron 40 mils (1000 microns) 25 mils (625 microns) 50 mils (1250 microns) slip bore Reinforced concrete Pre-stressed concrete cylinder 60 mils (1500 microns) 40 mils (1000 microns) 25 mils (625 microns) 30 mils (750 microns) \$60,000 \$50,000 \$40,000 \$30,000 \$20,000 \$53,107 \$40,129 Cement mortar Polyurethane \$10,000 \$0 Pumping cost Figure 5 Significant annual pumping cost with a Madison s polyurethane lining vs. cement-mortar for a 30,000 ft normal 24 inch size pipe Figure 5 illustrates that significant pumping cost savings of about \$12, US dollars could be achieved by simply the use of a Madison s 100% solids rigid polyurethane lining rather than a cement-mortar lining for a 30,000 feet length 24 inch normal size

8 steel pipe. This saving is estimated assuming: 6,000 gpm design flow, 70% pumping efficiency, \$0.06 dollar KWH unit power cost, a 140 Hazen-Williams C factor for a 375 mils thick cement-mortar lining and 150 for a 25 mils thick polyurethane lining. This represents the total pumping cost savings of over \$648,900 dollars during the pipeline operation period of a 50-year design life (assuming zero inflation). Pipe manufacturers can also save money from the use of Madison s 100% solids rigid polyurethane lining. The estimation in Figure 5 assumes a 24 inch normal size of steel pipe. About 2.83% pipe material cost could be saved if a Madison s polyurethane lining rather than a cement-mortar lining is used. For the 30,000 feet length pipeline, it means a pipe material cost saving of \$68,000 US dollars assuming a unit cost of \$80 per feet of steel. Furthermore, the above estimation assumes that Madison s 100% solids rigid polyurethane performs equally as cement-mortar. However, both laboratory and field experience and testing results have proved that the polyurethane would outperform the cement-mortar. 4. Summary Madison s 100% solids structural polyurethanes have better abrasive resistance and is smoother than cement-mortar and other lining materials, the pump efficiency of pipes lined with Madison s polyurethane coatings would be significantly higher than the case of other lining materials. 1 Dan Lundy, Water & Environmental Technology, Course Notes, Clackamas Community College, Oregon City, Oregon, USA, DIPRA, Hydraulic Analysis of Ductile Iron Pipe, U.S. Pipe, Polyurethane Lined Ductile Iron Pipe and Fittings For Force Mains and Gravity Sewer Lines, 1993

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