{"id":2040,"date":"2025-04-25T09:49:52","date_gmt":"2025-04-25T01:49:52","guid":{"rendered":"https:\/\/www.ductileironsuppliers.com\/?p=2040"},"modified":"2025-06-17T15:12:32","modified_gmt":"2025-06-17T07:12:32","slug":"what-is-the-wall-thickness-of-ductile-iron-pipe","status":"publish","type":"post","link":"https:\/\/www.ductileironsuppliers.com\/ar\/what-is-the-wall-thickness-of-ductile-iron-pipe.html","title":{"rendered":"\u0645\u0627 \u0647\u064a \u0633\u0645\u0627\u0643\u0629 \u062c\u062f\u0627\u0631 \u0623\u0646\u0627\u0628\u064a\u0628 \u062d\u062f\u064a\u062f \u0627\u0644\u062f\u0643\u062a\u0627\u064a\u0644\u061f"},"content":{"rendered":"

Ductile iron pipe wall thickness varies significantly based on nominal pipe size and design method\u2014either by pressure class (per ANSI\/AWWA C151\/A21.51) or by thickness class (per ANSI\/AWWA C150\/A21.50). For pressure classes 150\u2013350 psi, wall thickness ranges from 0.25 in for 3\u20136\u2033 pipes up to 0.87 in for 64\u2033 pipes. Alternatively, thickness classes (50\u201356) start at 0.25 in (class 51 for 3\u20134\u2033) and increase in ~0.03\u20130.04 in increments per class. In Europe, ISO 2531\/EN 545 defines metric nominal diameters (DN 40\u2013DN 2000) with wall thicknesses in classes K9\u2013K11, from 4.8 mm (K9) up to 7.5 mm (K11) for DN 40\u2013250 mm. Selection depends on working pressure, surge allowance, trench load, cover depth, and application requirements to ensure structural integrity and long service life.<\/p>\n

\"What<\/a>
What Is the Wall Thickness of Ductile Iron Pipe?<\/figcaption><\/figure>\n

1. Design Standards<\/h2>\n

1.1 Pressure Classes (ANSI\/AWWA C151\/A21.51)<\/h3>\n

ANSI\/AWWA C151\/A21.51 specifies ductile iron pipe from 3\u2033 to 64\u2033 nominal size, classifying wall thickness by working pressure\u2014150, 200, 250, 300, and 350 psi. Pressure classes correspond to rated water working pressure, with an additional 100 psi surge allowance in thickness design.<\/p>\n

1.2 Thickness Classes (ANSI\/AWWA C150\/A21.50)<\/h3>\n

ANSI\/AWWA C150\/A21.50 defines \u201cthickness classes\u201d 50\u201356 independent of pressure, allowing special applications (e.g., threaded or grooved pipe) with nominal thicknesses from 0.25 in (class 51 for 3\u20134\u2033) up to 1.05 in (class 56 for 54\u2033) . Designers select the greater thickness required for internal pressure or trench loads, per AWWA C150 tables.<\/p>\n

2. Wall Thickness by Pressure Class<\/h2>\n
\n

 <\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Nominal Size (in)<\/th>\nOutside Diameter (in)<\/th>\nClass 150 (in)<\/th>\nClass 200 (in)<\/th>\nClass 250 (in)<\/th>\nClass 300 (in)<\/th>\nClass 350 (in)<\/th>\n<\/tr>\n<\/thead>\n
4<\/td>\n4.80<\/td>\n0.26<\/td>\n0.26<\/td>\n0.26<\/td>\n0.26<\/td>\n0.26<\/td>\n<\/tr>\n
6<\/a><\/td>\n6.90<\/td>\n0.25<\/td>\n0.25<\/td>\n0.25<\/td>\n0.25<\/td>\n0.25<\/td>\n<\/tr>\n
8<\/a><\/td>\n9.05<\/td>\n0.27<\/td>\n0.27<\/td>\n0.27<\/td>\n0.27<\/td>\n0.27<\/td>\n<\/tr>\n
12<\/a><\/td>\n13.20<\/td>\n0.31<\/td>\n0.31<\/td>\n0.31<\/td>\n0.31<\/td>\n0.31<\/td>\n<\/tr>\n
16<\/td>\n17.40<\/td>\n0.34<\/td>\n0.34<\/td>\n0.34<\/td>\n0.34<\/td>\n0.34<\/td>\n<\/tr>\n
24<\/td>\n25.80<\/td>\n0.38<\/td>\n0.38<\/td>\n0.38<\/td>\n0.41<\/td>\n0.44<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Data from AWWA C151\/A21.51 pressure-class tables.<\/em><\/p>\n

3. Wall Thickness Classes<\/h2>\n
\n

 <\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
Thickness Class<\/th>\n3\u2033 & 4\u2033 Pipes (in)<\/th>\n6\u2033\u20138\u2033 Pipes (in)<\/th>\n10\u2033\u201312\u2033 Pipes (in)<\/th>\n14\u2033\u201316\u2033 Pipes (in)<\/th>\n<\/tr>\n<\/thead>\n
50<\/td>\n\u2014<\/td>\n0.25<\/td>\n0.29<\/td>\n0.33<\/td>\n<\/tr>\n
51<\/a><\/td>\n0.25<\/td>\n0.28<\/td>\n0.32<\/td>\n0.36<\/td>\n<\/tr>\n
52<\/a><\/td>\n0.28<\/td>\n0.31<\/td>\n0.35<\/td>\n0.39<\/td>\n<\/tr>\n
53<\/a><\/td>\n0.31<\/td>\n0.34<\/td>\n0.38<\/td>\n0.42<\/td>\n<\/tr>\n
54<\/a><\/td>\n0.34<\/td>\n0.37<\/td>\n0.41<\/td>\n0.45<\/td>\n<\/tr>\n
55<\/td>\n0.37<\/td>\n0.40<\/td>\n0.44<\/td>\n0.48<\/td>\n<\/tr>\n
56<\/a><\/td>\n0.40<\/td>\n0.43<\/td>\n0.47<\/td>\n0.51<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Based on ANSI\/AWWA C150\/A21.50 special \u201cthickness classes\u201d .<\/em><\/p>\n

4. European Metric Standards (ISO 2531 \/ EN 545)<\/h2>\n
\n

 <\/p>\n

\n\n\n\n\n\n\n\n\n
DN (mm)<\/th>\nOD (mm)<\/th>\nClass 40 (mm)<\/th>\nClass K9 (mm)<\/th>\nClass K10 (mm)<\/th>\nClass K11 (mm)<\/th>\n<\/tr>\n<\/thead>\n
100<\/td>\n118<\/td>\n4.8<\/td>\n6.0<\/td>\n6.0<\/td>\n<\/td>\n<\/tr>\n
150<\/td>\n170<\/td>\n5.0<\/td>\n6.0<\/td>\n6.5<\/td>\n<\/td>\n<\/tr>\n
200<\/td>\n222<\/td>\n5.4<\/td>\n6.3<\/td>\n7.0<\/td>\n<\/td>\n<\/tr>\n
250<\/td>\n274<\/td>\n5.8<\/td>\n6.8<\/td>\n7.5<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Per ISO 2531\/EN 545 metric classes for DN 40\u2013DN 2000.<\/em><\/p>\n

5. Selecting the Right Thickness<\/h2>\n

Key factors influencing wall thickness choice include:<\/p>\n