3. ASME B16.9 fittings

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90˚ Elbow Long

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Description

90˚ Elbow Long Radius is a pipe fitting used to change the flow direction of liquid or gas in a piping system. Its bending angle is 90 degrees and its bending radius is 1.5 times the nominal diameter of the pipe, so it is called “long radius”.

Applications

Used in industrial piping systems to redirect flow without causing great pressure.
Widely used in petroleum, chemical, food, pharmaceutical, and many other industries.

Standards

The ASME B16.9 standard includes dimensional requirements, tolerances, materials, and other provisions to ensure product integrity.
Other technical standards include ASTM, ANSI and MSS SP-43 for stainless steel and other alloy fittings.

Size

Common sizes for 90˚ Elbow Long Radius include diameters from 1/2 inch to 48 inches or larger depending on the specific requirements of the system.
Dimensional parameters of interest include nominal diameter (NPS), pipe thickness (schedule), and bending radius.

Material

Carbon Steel : ASTM A234 WPB, ASTM A106 Grade B, ASTM A53 Grade B
Stainless Steel : ASTM A403 WP304, WP304L, WP316, WP316L, WP321, WP321H, WP347, WP347H
Alloy Steel : ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91
Duplex and Super Duplex Stainless Steel : ASTM A815 UNS S31803 (Duplex 2205), ASTM A815 UNS S32750 (Super Duplex 2507)
Nickel Alloys : ASTM B366 UNS N04400 (Monel 400), ASTM B366 UNS N06625 (Inconel 625), ASTM B366 UNS N08825 (Incoloy 825)
Titanium Alloys : ASTM B363 WPT2, WPT12
Aluminum Alloys : ASTM B361 6061
Copper Alloys : ASTM B61 (Bronze), ASTM B62 (Brass)

ASME B16.9 90˚ Elbow Long Radius Thicknesses (Schedules)

90˚ Elbow Long Radius fittings to ASME B16.9 can be manufactured in a variety of thicknesses to suit pressure and temperature requirements in various applications. Below are common thicknesses (Schedule):

Popular Thicknesses (Schedules).

SCH 5S
SCH 10S
SCH 20
SCH 40S (STD – Standard)
SCH 60
SCH 80S (XS – Extra Strong)
SCH 100
SCH 120
SCH 140
SCH 160
XXS (Double Extra Strong)

Dimensions and Thickness of 90˚ Elbow Long Radius from 1/2 inch to 24 inches according to ASME B16.9

NPS (Inch)	OD (mm)	SCH 5S (mm)	SCH 10S (mm)	SCH 20 (mm)	SCH 40S (STD) (mm)	SCH 80S (XS) (mm)	SCH 120 (mm)	SCH 160 (mm)	XXS (mm)
1/2	21.3	1.65	2.11	2.41	2.77	3.73	–	–	–
3/4	26.7	1.65	2.11	2.41	2.87	3.91	–	–	–
1	33.4	1.65	2.77	3.38	3.38	4.55	–	–	–
1 1/2	48.3	1.65	2.77	3.68	3.68	5.08	–	–	–
2	60.3	1.65	2.77	3.91	3.91	5.54	7.11	–	–
2 1/2	73.0	2.11	3.05	5.16	5.16	7.01	7.47	–	–
3	88.9	2.11	3.05	5.49	5.49	7.62	9.27	–	–
3 1/2	101.6	2.11	3.05	5.74	5.74	8.08	9.52	–	–
4	114.3	2.11	3.05	6.02	6.02	8.56	11.13	–	–
5	141.3	2.77	3.40	6.55	6.55	9.53	12.70	–	–
6	168.3	2.77	3.40	7.11	7.11	10.97	15.09	18.26	21.95
8	219.1	2.77	3.76	8.18	8.18	12.70	19.05	23.01	26.57
10	273.0	3.40	4.19	9.27	9.27	15.09	22.23	28.58	32.51
12	323.8	3.96	4.57	9.53	10.31	17.48	25.40	33.32	37.49
14	355.6	3.96	4.78	9.53	11.13	19.05	28.58	36.53	–
16	406.4	4.19	4.78	9.53	12.70	21.44	30.96	40.49	–
18	457.2	4.19	4.78	9.53	14.27	23.83	34.29	44.45	–
20	508.0	4.78	5.54	9.53	15.09	26.19	38.10	48.26	–
22	558.8	5.54	6.35	9.53	15.88	28.58	41.15	53.98	–
24	609.6	6.35	6.35	9.53	17.48	31.75	44.45	59.54	–

Material summary table for 90˚ Elbow Long

MATERIAL	STANDARD	MECHANICAL PROPERTIES	APPLICATION
Carbon steel	ASTM A234 WPB	Tensile strength: 415-585 MPa	Oil and gas pipeline, industrial water system
Stainless Steel	ASTM A403 WP304/316	Tensile strength: 485-700 MPa	Chemicals, food, pharmaceuticals
Alloy steel	ASTM A234 WP5/WP9	Tensile strength: 415-585 MPa	High temperature, high pressure
Copper	ASTM B61/B62	Tensile strength: 205-275 MPa	Water supply system, HVAC
Aluminum	ASTM B241/B345	Tensile strength: 140-310 MPa	Air conditioning and heat conduction system
PVC/CPVC plastic	ASTM D2466/D2846	Tensile strength: 34-55 MPa	Water supply and drainage system, light chemicals