08/08/2018 In Products Technical

Cement-mortar lining for iron pipe has been used for nearly 100 years. The first installation of greyness iron pipe with a cement lining was recorded in Savannah, GA in 1922. Today's modernDuctile fe pipe still utilizes cement lining for a safe and reliable means of providing make clean drinking water to millions of people every day.

On occasion, however, the cement lining may have incurred some harm in the field. The lining, although very durable, does not take the same resistance to bending stress or impact as the piping itself. Certainly, the pipe or fitting should be checked for farther structural damage, but one time adamant the affected area is only the cement lining, repairs can be made under the applicable provisions within the ANSI/AWWA C104/A21.4 standardCEMENT-MORTAR LINING FOR DUCTILE Fe PIPE AND FITTINGS.

The Procedure for Repairing Cement Mortar Linings:

The process for making these repairs is outlined in the AWWA C104 standard as well as the AWWA M41 Manual of Practice for DUCTILE Fe Piping AND FITTINGS. Prior to start, you lot should verify with the pipe manufacturer that the materials to be used, including the cement and seal glaze, are suitable for utilize. That is, they encounter the necessary requirement of the standard and are NSF 61 and NSF 372 approved.

The steps to repair are equally follows:

  1. Cut out the damaged area completely to the metal surface, edges should exist perpendicular or slightly undercut.
  2. Clean the damaged expanse and surrounding expanse to exist repaired.
  3. Mix a stiff mortar consisting of i part of cement to two parts of sand by book.
  4. Wet the area to be repaired too equally the area surrounding the repair.
  5. With a trowel, apply the cement lining to the damaged area and smooth evenly with the adjoining, undamaged lining.
  6. A taper of the lining thickness at the ends of the pipage or fitting is allowed nether the AWWA C104 Standard. The length of the taper should be a brusque equally possible and should not exceed 2 inches for a standard lining or 4 inches for a double thickness lining.
  7. If required, apply seal coat to the repaired area within 5-30 minutes post-obit the application of the cement. A section of wet canvas or burlap tin be tied to the pipe or fitting stop to allow moisture retentiveness and assist with curing of the cement lining
  • Notation: The standard lining thickness for pipe and fittings is equally follows:
    •  3 – 12-inch pipe - 1/xvi inch
    • fourteen – 24-inch pipe – 3/32 inch
    • xxx – 64-inch – i/8 inch
    • Double thickness linings at twice the thicknesses noted can exist provided if specified past the purchaser

Pro Tip: Repairs tin simply be made in areas easily accessible by accomplish such equally well-nigh the pipe or plumbing fixtures ends. For pipe that has been damaged in the eye, consider setting these aside for utilise as spools or field cut piping.

Bundle of Cement-Lined Ductile Atomic number 26 Pipe.

Helpful Tips to Avoid Damage In The Field:

Finally, a few reminders to aid minimize the occurrence of the damaged pipe while on the job site:

  • Always handle the pipage with the proper equipment.
  • Be careful not to drop or touch the pipe while unloading.
  • The pipe should exist properly stored on timbers – never just stacked on themselves.
  • Last, information technology is not recommended to insert forks within the pipe barrel for transportation equally this tin damage a lining across the ability to repair.

For additional information on repairing cement linings please contact your local McWane Ductile Sales Representative.

Ductile iron pipe cement-mortar lining repair tip sheet

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Jeff Houser

Jeff Houser, McWane Ductile New England District Senior Sales Representative, is a 2d-generation waterworks professional in the Northeast with electric current responsibilities for the New England Commune. Jeff started his waterworks career in the late '80s. He learned the waterworks business past selling for an independent distributor in fundamental Vermont and managing territories in the Empire and New England district. Jeff graduated from SUNY Schenectady with an acquaintance degree in Hotel Eating place Direction. Jeff is an agile member of the Connecticut Section AWWA, New England WW Association, and Utility Contractors Association of Northward.E. Jeff received the McWane Ductile Salesperson of the year honour in 2022 and 2022, likewise equally the 2022 Kenneth O. Hodgson Distinguished Service Award in 2022 from NEWWA. Jeff strives to support Distributors, Contractors, Fabricators, and the Municipal customer base throughout the New England Territory. In his spare fourth dimension, he enjoys spending time with his wife of more 30 years, Jean, and being outdoors, hunting, fishing, and golfing.