AWWA C208 Mitered Pipe Bend

For some large size elbows, some customers would choose the mitre type which could save time and money in manufacturing.The usual standard for mitre elbows is AWWA C208.

Specification

Description	Range
DN range	100 To 2400
PN Range	PN6, PN10, PN16, PN25

The following are the characteristics of this elbow of C&N.

Degree≤22.5°,use 2pieces to weld
22.5°< degree ≤ 45°, use 3 pieces to weld
45° <degree ≤ 67.5°, use 4 pieces to weld
67.5° < degree ≤ 90°, use 5 pieces to weld

❯❯ The number of the miters should be a maximum of 5 according to ASME B 31.3 specification.

Miter Elbow Formula

In upper image, dashed lines shows where the pipes needs to be cut. Every dashed cut line incorporates a vertical reference line marked at following distances from pipe finish.

– Cut Back : Offset distance of cut lines from reference lines at the pipe bottom and top.
– L1 : Distance between reference lines.
– L2 : Distance Between the first and the last reference line from pipe end.

Miter Elbow Input values:

– N = 4 : No. of cuts
– D = 90 mm : Required Miter Elbow Degree
– POD = 273 mm : Pipe O.D.
– E = 381 mm : Standard Radius of Miter Elbow

Weight Calculation of Miter Elbow

Weight = 2*R*n*tan(alfa/(2*n))*W, where

alfa = bend angle (total)
n = no. of miter joints
W = Unit weight of pipe (kg/ m or lb/ feet)
R = bend radius at end (=circumscribed)

Equivalent Lengths of Mitered Elbow

Miter pipe fittings	Spiral Welded Steel e = 0.1 millimeter	Steel e = 0.05 millimeter
Threaded Miter Pipe bend
90° elbow, r/ d=1	26	30
45° elbow, r/ d=1	14	16

Wel Miter Pipe bend
90° elbow, sharp bend	49	55
90° elbow, r/ d=1	16	19
90° elbow, r/ d=1.5	12	13
90° elbow, r/ d=2	10	11

45° elbow, sharp bend	16	18
45° elbow, r/ d=1	12	14
45° elbow, r/ d=1.5	8.3	9.4

AWWA C208 elbows are made from mitre-cut pieces of pipe. The mitre cut pieces that make up the elbow are called gores. In a 5 piece elbow there are two end gores and three middle gores. When welded together, the elbow looks like the back of a shrimp.
Apart from elbows, C&N rolls and welds other mitred pipe fittings under AWWA C208 dimensions, which include tees, reducers, crosses, wyes, laterals, reducing elbows, saddles and so on. Welcome to contact us if any same goods are required.

MATERIAL EXCELLENCE: Forged from robust carbon steel, our fittings ensure durability and longevity. They withstand the rigours of water systems, from high pressure transmission to everyday distribution.

PRECISE DIMENSIONS: The standard provides precise guidelines for the manufacture of these fittings. Whether it’s elbows, tees or reducers, our dimensions are perfectly aligned with industry requirements.

COST-EFFICIENCY AND RELIABILITY: Carbon steel strikes the perfect balance between cost effectiveness and performance. Our fittings minimise installation costs while maximising reliability.

WATER INFRASTRUCTURE TRANSFORMATION: By adhering to this standard, we contribute to sustainable water networks. From treatment plants to distribution pipelines, our fittings ensure seamless flow.

COATING AND CORROSION PROTECTION: We apply special coatings to enhance durability and prevent corrosion. These coatings protect against environmental factors, ensuring extended service life.

Dimensions of Steel Water Pipe Fitting

Notes:

All dimensions based on outside diameter of pipe equal to nominal diameter, D, except dimensions for 12-in. nominal and smaller pipe, which are based on pipe OD noted.
For elbow dimensions, see Sec. 4.1.13.3 and Figure 2.
Add additional length to these dimensions when necessary for fanged, mechanical couplings, or bell and spigot joints, or as needed to meet other design conditions.
*Lateral dimensions given are for an equal diameter, 30° angle fitting. For an angle greater than 30° through 70°, see equations in Sec. 4.1.7. For angles greater than 70°, use dimension given for a tee.