Dimensions and Weights: Circular Concrete Pipe

Dimensions and approximate weights of circular reinforced concrete pipe manufactured to ASTM C 76, reinforced concrete culvert, storm drain and sewer pipe. The tables give internal diameter, waterway area, minimum wall thickness and approximate weight per foot for the two wall types in general use, with large sizes and metric equivalents following.

Graduated sizes of circular reinforced concrete pipe stacked in a precast yard.

Wall B and Wall C

ASTM C 76 defines more than one wall thickness for the same internal diameter. Wall B is the standard wall and covers the full diameter range. Wall C is a thicker wall, available from 24 in. upward, and is the reason the first six rows of the Wall C columns read as dashes rather than as values — it is not produced at the smaller diameters.

The choice between them has three practical consequences worth separating:

Strength. A thicker wall carries more reinforcement and can reach a higher class at the same diameter. Where a class table returns a requirement at the top of the standard range, Wall C is one of the routes to meeting it.
Weight. Wall C is substantially heavier — at 48 in., roughly 1,010 lb/ft against 867 lb/ft for Wall B. That difference is a lifting, hauling and bedding consideration, not a footnote, and it changes what equipment the contractor needs.
Outside diameter. A thicker wall means a larger outside diameter at the same waterway, which affects trench width, clearance to other utilities and the earth load the pipe attracts.

The 8 in. and 10 in. sizes carry an asterisk in the tables. Although not specifically called out in ASTM C 76, circular concrete pipe in these two diameters is routinely manufactured; at those sizes non-reinforced pipe under ASTM C 14 is normally the specified product, as set out at applicable specifications and recommended use.

Standard sizes, English units

Circular reinforced concrete pipe, ASTM C 76 — dimensions and approximate weights (English units)
Internal diameter, in	Waterway area, sq ft	Wall B min. thickness, in	Wall B weight, lb/ft	Wall C min. thickness, in	Wall C weight, lb/ft
8*	0.3	2	60	---	---
10*	0.5	2	87	---	---
12	0.8	2	93	---	---
15	1.2	2.25	127	---	---
18	1.8	2.5	168	---	---
21	2.4	2.75	214	---	---
24	3.1	3	264	3.75	365
27	4.0	3.25	322	4	420
30	4.9	3.50	384	4.25	475
33	5.9	3.75	451	4.50	550
36	7.1	4	524	4.75	655
42	9.6	4.50	686	5.25	810
48	12.6	5	867	5.75	1010
54	15.9	5.50	1068	6.25	1210
60	19.6	6	1295	6.75	1475
66	23.8	6.50	1542	7.25	1735
72	28.3	7	1811	7.75	2015
78	33.2	7.50	2100	8.25	2410
84	38.5	8	2409	8.75	2660
90	44.2	8.50	2740	9.25	3020
96	50.2	9	3090	9.75	3355
102	56.7	9.50	3480	10.25	3760
108	63.6	10	3865	10.75	4160

Large sizes, English units

Above 108 in. the product moves into the large-size range, tabulated separately. Note that in this range the wall thickness in inches equals the internal diameter in feet — a 12 ft pipe has a 12 in. wall — which is a convenient check when reading a schedule.

Circular reinforced concrete pipe, ASTM C 76 large sizes — dimensions and approximate weights (English units)
Internal diameter, in	Internal diameter, ft	Wall thickness, in	Waterway area, sq ft	Approximate weight, lb/ft
114	9.5	9.5	70.8	3840
120	10	10	78.5	4265
126	10.5	10.5	85.6	4690
132	11	11	95.0	5150
138	11.5	11.5	103.8	5625
144	12	12	113.0	6125
150	12.5	12.5	122.7	6645
156	13	13	132.7	7190
162	13.5	13.5	143.1	7755
168	14	14	153.9	8340
174	14.5	14.5	165.0	8945
180	15	15	176.6	9570

Metric units

The metric table lists the conventional nominal metric diameter alongside the inch size. The correspondence is conventional rather than exact: 300 mm is the metric designation for 12 in., 900 mm for 36 in., 2,700 mm for 108 in. Waterway areas are in square metres, thicknesses in millimetres and masses in kilogrammes per metre.

Circular reinforced concrete pipe, ASTM C 76 — dimensions and approximate masses (metric units)
Internal diameter, in	Internal diameter, mm	Waterway area, m²	Wall B min. thickness, mm	Wall B mass, kg/m	Wall C min. thickness, mm	Wall C mass, kg/m
8*	200	0.03	51	90	---	---
10*	250	0.05	51	130	---	---
12	300	0.07	51	140	---	---
15	375	0.11	57	190	---	---
18	450	0.16	64	250	---	---
21	525	0.22	70	320	---	---
24	600	0.29	76	390	95	545
27	675	0.37	83	480	102	625
30	750	0.46	89	570	108	710
33	825	0.55	95	670	114	820
36	900	0.66	102	780	121	975
42	1050	0.89	114	1020	133	1205
48	1200	1.17	127	1290	146	1505
54	1350	1.48	140	1590	159	1800
60	1500	1.82	152	1925	171	2190
66	1650	2.21	165	2295	184	2580
72	1800	2.62	178	2695	197	3000
78	1950	3.08	190	3125	210	3585
84	2100	3.57	203	3585	222	3960
90	2250	4.10	216	4075	235	4495
96	2400	4.67	229	4600	248	4990
102	2550	5.27	241	5180	260	5595
108	2700	5.91	254	5750	273	6190

Using these figures

Weights are approximate and are given for estimating, handling and transport planning; actual weights vary with the mix, the reinforcement and the manufacturer's tolerances, and a producer's own schedule governs for a real order. Waterway areas are the internal cross-sectional area at the nominal diameter and are the figures used when comparing capacity against an equivalent round size in a non-circular section — see elliptical pipe and box sections.

Availability of any given size, wall type and class varies by region and by plant. Confirm with local producers before fixing a design on an unusual combination. Current dimensional data is maintained by the American Concrete Pipe Association, and the class required for a given diameter and fill height is tabulated under storm sewers and pipe culverts.