One thing that has often confused users (whether I’m talking with engineers, distributors or contractors) is the difference between “Thickness Class” and “Pressure Class” pipe. While both refer to a specific metal wall thickness of the pipe barrel, in this article we will discuss the history of the two class standards, and what class of ductile iron pipe you should use in your application.
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.
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.
Many of you may have had the opportunity to attend the AWWA/ACE 18 Conference held in Las Vegas just a few weeks ago. Among the many highlights of that show is the Annual Pipe Tapping Contest.
The participants consist of both US and International teams that are selected through a qualifying process where they would have competed in various regional or sectional events held throughout the preceding year.
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