AWWA C205 Cement Mortar Lining, C210 Epoxy, C222 Polyurethane
Available coating options include AWWA C205 Cement Mortar Lining, AWWA C210 Epoxy lining and coating; AWWA C222 Polyurethane lining and coating.
One of the various linings offered by Jindal Tubular USA is Cement Mortar (CML). It has been used to line metallic pipe in the United States since the late 1800’s. Hand applied CML linings were used for over 40 years before a practical method of applying the material was developed. CML is preferred by many of our customers here in the USA due to its strength, protective qualities, and long successful experience record.
Jindal Tubular USA applies CML in accordance with the American Water Works (AWWA) C-205 standard. AWWA first developed and adopted a set of standard specifications for CML and its application in June of 1941. The lining applied by Jindal Tubular is certified to NSF/ANSI Standard 61 and 372 through testing by NSF International.
Jindal’s Bay St. Louis facility uses a mortar produced by mixing cement conforming to ASTM C150, Type I, Type II, or Type V depending on the customer’s preference. The aggregate complies with the requirements of ASTM C33, with a gradation passing 100 percent US Standard Sieve No. 4, and water from the potable water system.
The mix is applied to the proper depth by an applicator passing through the center of a rotating pipe. The speed of the applicator and the flow of the mortar are synchronized so that the pipe is lined completely without interruption to the proper depth. A batch of concrete will contain on the average 2 parts ASTM C-33 fine aggregate and 1 part Portland cement type2 per 3,000lb batch. The rotating pipe is brought up to pouring speed in rotation of approximately 400 rpm while the cement mix is sprayed throughout the entire I.D. of the pipe. Once all material is spayed, the rotation speed is brought up to what is referred to as packing speed (average 750RPM) and the mix centrifugally distributes itself to an even thickness throughout the entire length of the pipe. The excess water is removed with the use of a blower while the pipe is at packing speed. When the rotation is stopped, thickness of lining is checked and the pipe is moved to a curing bay.
Jindal Tubular uses two types of curing processes. The lining can be cured using moist curing if the ambient temperature is greater than 40 degrees F. Moist curing requires the ends of the pipe to be covered with plastic or wet burlap and the pipe allowed to sit for a period of 96 hours.
The CML can also be cured using the Accelerated curing method through the use of steam. This method requires to ends of the pipe to be covered and heat applied resulting in a minimum temperature of 95 degrees Fahrenheit for 18 hours.
Pipes 36 inches in diameter and smaller are lined to a thickness of 0.375 inches, pipe greater than 36 inches are lined to a depth of 0.5 inches with CML. This in governed by the AWWA Standard and/or customer specifications.