Inspecting the drawings provided, our engineering showed their feasibility. After discussing the detailed data of the elbows, the client placed the order in February.

Since there’re 540 pcs in total for 2 items, we made one sample for client’s confirmation at first. After client’s evaluation and confirmation, we produced the elbow in quantity.

After reviewing all the goods photos, the client agreed to arrange delivery.

Inspection photos

ASTM A234 WPB Elbow is a type of pipe fitting commonly used to change the direction of fluid flow in a piping system. It is made from carbon steel that conforms to the ASTM A234 standard, which specifies the requirements for pipe fittings made from wrought carbon steel and alloy steel.

ASTM A234 WPB Explanation

ASTM A234: This is a standard specification set by ASTM International (formerly known as the American Society for Testing and Materials) for wrought carbon steel and alloy steel fittings. It includes various fittings like elbows, tees, reducers, and caps used in pressure systems and piping.

WPB: This refers to a specific grade of carbon steel material under ASTM A234. WPB stands for Weldable (W), Pipe (P), and Grade B (B). This means the material is suitable for welding and can handle moderate pressure and temperature conditions. WPB fittings are typically used in carbon steel piping systems where medium pressure is involved.

Manufacturing Process

Forging: The elbow is forged into shape to meet the desired specifications.

Heat Treatment: Elbows are heat-treated to improve mechanical properties, especially strength and durability.

Welding: Elbows are often welded to other pipes to form a continuous pipeline. Welding procedures are crucial to ensure the joint’s strength and prevent leaks.

Non-Destructive Testing: Elbows are tested for defects using methods like X-rays or ultrasonic testing to ensure no internal or external flaws.

Specification of ASME B16.9 Elbow

90 Degree Elbow Dimensions

Key Characteristics of ASTM A234 WPB Elbow

Material: WPB fittings are made of carbon steel, commonly using materials like A106 Grade B or A53 Grade B steel, offering good strength, weldability, and pressure tolerance.

Temperature Range: ASTM A234 WPB fittings are suitable for use in systems operating within the temperature range of -29°C to 425°C (-20°F to 800°F).

Strength: The tensile strength of WPB fittings is typically around 485 MPa (70 ksi) minimum, ensuring they can withstand standard operating pressures.

Corrosion Resistance: While WPB elbows offer good resistance in non-extreme environments, they are generally not suitable for highly corrosive or acidic environments. They are commonly used in systems carrying water, oil, and natural gas.

Applications: Commonly used in pipelines for oil and gas, chemical plants, power generation, and HVAC systems.

Common Applications

Oil and Gas Industry: For the transportation of oil, natural gas, and water pipelines.

Chemical and Petrochemical Plants: Used in fluid and gas transport systems, especially in medium-pressure applications.

Power Plants: For steam, water, and gas transport systems.

HVAC Systems: Used for systems requiring a change in fluid flow direction.

Common Sizes and Angles

Angles: The most common elbow angles are 45°, 90°, and 180°. These are used to change the direction of the pipeline in various ways.

Pipe Sizes: ASTM A234 WPB elbows come in a wide range of sizes, from small-diameter pipes to large-diameter pipes, depending on the project’s requirements. 

The post ASTM A234 WPB Elbow Order appeared first on Quality Manufacturer of Industrial Pipe Fittings.

Elbows are within our products. Thus we offered our competitive quotation based on the drawing. Two months later, the customer showed us more accurate drawing, together with many photos showing the details of the elbow that they wanted. We inspected all the information offered updated quotation fulfilling customer’s requirements.

After reviewing our quotation, the client placed the order. And after reviewing our sample elbow, we manufactured in quantity.

We took very detailed photos of the sample to make sure that’s what our client want.

Sample inspection photos

ASTM A234 WPB Elbow Specification

ASTM A234 WPB Elbow refers to an elbow pipe fitting made from carbon steel that complies with the ASTM A234 standard and has a WPB material grade designation. The A234 specification covers wrought carbon steel and alloy steel fittings that are intended for use in pressure piping systems. The WPB grade specifically refers to a material that is commonly used for seamless and welded butt-welding fittings.

Butt Weld Elbow is a commonly used pipe fitting, usually used to change the direction of the pipe. According to the angle of the elbow, there are three common types of butt weld elbows: 45 degrees, 90 degrees and 180 degrees.

The 45 degree butt weld elbow is an elbow used to change the direction of the pipe. The bending angle is 45 degrees, which is used to offset the direction of the pipe by 45 degrees.

The 90 degree butt weld elbow is used to change the direction of the pipe by 90 degrees, that is, to form a right angle. This type of elbow is common in pipe systems that require large turns.

The 180 degree butt weld elbow is usually used when the direction of the pipe is completely reversed, forming a U-shaped bend. It completely reverses the flow direction of the pipe and returns to the starting position.

ASTM A234 WPB Butt Weld Fittings Chemical Composition

ASTM A234 WPB Butt Weld Fittings Mechanical Property

180 Degree Elbow Dimension

Nominal Size		Outside Diameter at Bevel	Center to Center		Back to Face
			180° Returns
DN	NPS	OD	O		K
			LR	SR	LR	SR
15	1/2	21.3	76		48
20	3/4	26.7	76		51
25	1	33.4	76	51	56	41
32	1 1/4	42.2	95	64	70	52
40	1 1/2	48.3	114	76	83	62
50	2	60.3	152	102	106	81
65	2 1/2	73	190	127	132	100
80	3	88.9	229	152	159	121
90	3 1/2	101.6	267	178	184	140
100	4	114.3	305	203	210	159
125	5	141.3	381	254	262	197
150	6	168.3	457	305	313	237
200	8	219.1	610	406	414	313
250	10	273	762	508	518	391
300	12	323.8	914	609	619	467
350	14	355.6	1067	711	711	533
400	16	406.4	1219	813	813	610
450	18	457	1372	914	914	686
500	20	508	1524	1016	1016	762
550	22	559	1676	1118	1118	838
600	24	610	1829	1219	1219	914
650	26	660
700	28	711
750	30	762
800	32	813
850	34	864
900	36	914
950	38	965
1000	40	1016
1050	42	1067
1100	44	1118
1150	46	1168
1200	48	1219

Tolerances for Butt-Weld Fittings

TOLERANCES  FOR  BW FITTINGS
Nominal  Size		All Fittings		45°&90° Elbows & Tees, Crosses	3D Radius Elbows	180°    Returns			Caps	Reducers & Lap Joint Stub Ends	Lap Joint  Stub Ends
DN	NPS	OD 3) 4)	ID 3)	A   B   C   M	A   B	O	K	U	E,  E1	H   F	G	R	t
15-65	1/2 -21/2	+1.6 -0.8	± 0.8	± 2	± 3	± 6	± 6	±  1	± 3	± 2	0      -1	0      -1	+1.6 0
80-90	3-31/2	± 1.6	± 1.6	± 2	± 3	± 6	± 6	±  1	± 3	± 2	0      -1	0      -1	+1.6 0
100	4	± 1.6	± 1.6	± 2	± 3	± 6	± 6	±  1	± 3	± 2	0      -1	0      -2	+1.6 0
125-200	5-8	+2.4 -1.6	± 1.6	± 2	± 3	± 6	± 6	±  1	± 6	± 2	0      -1	0      -2	+1.6 0
250-450	10-18	+4.0 -3.2	± 3.2	± 2	± 3	± 10	± 6	± 2	± 6	± 2	0      -2	0      -2	+3.2 0
500-600	20-24	+6.4 -4.8	± 4.8	± 2	± 3	± 10	± 6	± 2	± 6	± 2	0      -2	0      -2	+3.2 0
650-750	26-30	+6.4 -4.8	± 4.8	± 3	± 6	—	—	—	± 10	± 5	—	—	—
800-1200	32-48	+6.4 -4.8	± 4.8	± 5	± 6	—	—	—	± 10	± 5	—	—	—
1300-1500	52-60	+6.4 -4.8	± 4.8	± 5	—	—	—	—	—	—	—	—	—
1600-1700	64-68	+6.4 -4.8	± 4.8	± 5	—	—	—	—	—	—	—	—	—
1800-2000	72-80	+6.4 -4.8	± 4.8	± 5	—	—	—	—	—	—	—	—	—

Inspection and Testing

Visual Inspection: To ensure there are no surface defects, cracks, or deformation.

Dimensional Inspection: Verifying the elbow’s dimensions, wall thickness, and radius, ensuring it meets the required specifications.

NDT (Non-Destructive Testing): Methods like X-ray, ultrasonic testing (UT), or magnetic particle testing (MPT) may be used to check for internal flaws or weld defects, particularly for critical applications.

Hydrostatic Testing: Performed to ensure that the elbow can withstand the pressure it will encounter during service without leaking.

ASTM A234 WPB Elbow Application

1. Oil and Gas Industry

2. Chemical Processing

3. Power Plants

4. Water Treatment Plants

5. Heating and Ventilation Systems (HVAC)

6. Marine and Shipbuilding

7. Industrial Manufacturing and Construction

8. Food and Beverage Industry

9. Pharmaceutical Industry

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