What is the AWWA Standard for Ductile Iron Pipes?

Ductile iron pipes, widely used for their durability and strength, are manufactured according to various specifications, including American and European standards. These standards provide guide lines on dimensions, thicknesses, and other critical attributes to ensure the pipes meet the required performance and quality levels for different applications. Below are the key dimensions andthicknesses according to American  (ANSI/AWWA).

AMERICAN SPECS(ANSI/AWWA C151)

OD/ ID, WT/ Class

The American Water Works Association (AWWA) provides specifications for DI pipes through ANSI/AWWA CI51/A21.51. These specifications cover a range of diameters and pressure classes:

Diameter: The nominal sizes for ductile iron pipes under AWWA standards range from 3 inches (about 76 mm) to 64 inches(about 1,626 mm).

Thickness Class: AWWA standards specify thickness classes rather than specific wall thicknesses. These classes aredesignated as Class 50 through Class 56 for pipes up to 24 inches in diameter, with each class coresponding to a different wall thickness desianed to withstand varying levels of internal pressure and external loads.

Pressure Class: The pipes are also categorized by pressure classes, typically ranging from 150 psi (about 1,034 kPa) to 350psi (about 2,413 kPa), indicating the maximum operating pressure the pipes are designed to handle.

Inside Diameter (UNL/CL/DCL): inside diameter varies depending on the presence of internal lining material (UNL = unlinedpipe, i.e. bare ductile iron,CL= cement lined, DCL= Double cement lined)

Note that:

ANSI/AWWA C151/A21.51: American standard for ductile iron pipes for water and other liquids.

ANSI/AWWA C115/A21.15: For flanged ductile iron pipes.

Here is a size chart with the dimensions and weights of ductile iron pipes for water transmission (Nps 3″ to 54″ – Class 53, the most commonly used for water applications):

Pipe Lengths (ANSI/AWWA): Under the American National standards linstitute (ANSl and the American Water Works Association (AWWA) specificationsparticularly ANSI/AWWA C151/A21.5l, ductile iron pipes are commonly provided in the following lengths:

Laying Lengths: The standard laying length for ductile iron pipes in the United States is usually  5.5 meters or 6.l meters for the main body of the pipe, not including the length of the joint or bell.

Custom Lengths: Some projects may require pipes of specific lengths to accommodate unique design considerations, and manufacturers can provide pipes in custom lengths according to project specifications.

  #AWWAC151 #DIP  #ductileironpipesforwaterandotherliquids #flangedductileironpipes #ductileironpipesforwatertransmission