There are various methods available for restraining Ductile Iron Pipe joints, and a common question our customers ask us is, “Which method of restraint is best – locking gaskets or boltless restrained joints?”
Both methods work very well, but the “best” method of restraint for your project can vary depending on the type of installation, the pressure the line will operate under, and the size (diameter) of the ductile iron pipe that is being used.
In this article, we will compare two common restraint options supplied by McWane Ductile - Sure Stop 350® Gaskets and TR Flex® pipe.
Is every piece of ductile iron pipe round? The short answer is no, but most of the time it is so slight that it is not even noticeable to the user. In fact, the way pipe is manufactured today, out-of-round issues are rarely a concern. At our foundries, there are quality assurance procedures in place that help safeguard this from occurring.
Cement-mortar lining for iron pipe has been used for nearly 100 years. The first installation of gray iron pipe with a cement lining was recorded in Savannah, GA in 1922. Todays modern Ductile iron pipe still utilizes cement lining for a safe and reliable means of providing clean drinking water to millions of people every day.
On occasion, however, the cement lining may have incurred some damage in the field. The lining, although very durable, does not have the same resistance to bending stress or impact as the pipe itself. Certainly, the pipe or fitting should be checked for further structural damage, but once determined the affected area is only the cement lining, repairs can be made under the applicable provisions within the ANSI/AWWA C104/A21.4 standard CEMENT-MORTAR LINING FOR DUCTILE IRON PIPE AND FITTINGS.
All ductile iron pipe manufacturers use markings in a similar manner to assist customers in selecting the right material for the project. This includes verifying the material is suitable for the application intended (i.e. water or sewer) as well as adhering to the project requirements as stipulated by the owner/engineer for pipe class, lining, and exterior coating.
Because the colors used by each manufacturer may vary, we will explain how McWane Ductile applies these markings and describe their need and locations.
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