API 5L pipe bend | API 5l carbon steel 45/ 90 deg bends manufacturer

What is the minimum bending radius for API 5l carbon steel long radius bends?

API 5L does not provide specific guidelines for the minimum bending radius of long radius bends. The minimum bending radius for API 5L carbon steel long radius bends is generally determined by factors such as the pipe diameter, wall thickness, material properties, and the specific bending process used.
Industry standards frequently advise employing bending radiuses that are multiples of the pipe diameter, like 3 or 5 times.
However, it is still important to consult industry standards, guidelines, and experienced professionals. Only then can one determine the appropriate minimum bending radius for carbon steel API 5l piggable bends.

Check API 5l carbon steel 45 degree bends application

How do you select the correct API 5l seamless bend for a specific application?

For seamless pipes, API 5L defines a number of grades of carbon steel and alloy steel, including API 5L Grade B, X42, etc. Depending on the demands of the application, choose the appropriate grade for the API 5l seamless bend. Some of these are the fluid's corrosivity, temperature, pressure, and mechanical qualities.
Based on the system's flow rate, pressure requirements, and structural factors, take into account the needed pipe diameter and size.
Based on the layout of the system, the available space, and the flow parameters, determine the necessary bend radius and bend angle.
Establish the necessary bend angle for the application, such as a API 5l psl1 90-degree hot bend.
Verify that the chosen bend conforms with the applicable norms and requirements.

What is the maximum allowable bending angle for API 5l short radius bend?

A maximum permitted bending angle for an API 5L small radius bend is not specified by API 5L. Instead, it is determined by practical factors including the pipe's wall thickness, the qualities of the material, and the particular requirements of the application.
Now, too acute bending angles may result in stress concentrations, which may compromise the performance of pipes or cause early failure. It is typically advised to keep the bending angle in check when bending Api 5l 2.5d pipe with a small radius.
The best course of action is to consult with engineering codes, standards, and guidelines from the industry. Such as, ASME B31.3 for process piping or ASME B31.4/B31.8 for pipeline transportation systems.

API 5L pipe bend specification

Material	Sizes	Types
API 5L	1/2"-24" (seamless) 2"-36" (welded)	Semaless Welded
Bends Radii	Test Certificates	Wall thickness
75 / 100 / 250 / 300 / 500 / 800 / 1,000 / 1,500 mm	EN 10204/3.1B 100% Radiography Test Report Third Party Inspection Report	SCH 5 to SCH XXS
Ends	Value Added Services	Surface
Bevel End / Buttweld	Hot Dipped Galvanizing Electro Polish Epoxy & FBE Coating	Nature color Anti-rust oil Black panting
Radii	Delivery Time	Bending methods
1.5d / 2.5d / 3d / 4d / 5d / 6d / 7d	7-14 days	Cold bending Hot bending

Types of API 5L Pipe Bend

Stainless Steel 316 pipe bends

Stainless steel 316 pipe bend

Stainless steel 316 bend

Stainless steel WP316 45 degree pipe bends

SS 316 90 deg Pipe Bending

Stainless 316 bend

API 5L pipe bend dimensions

Nominal Size			Center to End		Center to Center		Back to Face
Nominal Size			90°Bend	45°Bend	180°Returns
DN	NPS	OD	A	B	O		K
DN	NPS	OD	3D	3D	LR	SR	LR	SR
15	1/2	21.3			76		48
20	3/4	26.7	57	24	76		51
25	1	33.4	76	31	76	51	56	41
32	1 1/4	42.2	95	39	95	64	70	52
40	1 1/2	48.3	114	47	114	76	83	62
50	2	60.3	152	63	152	102	106	81
65	2 1/2	73	190	79	190	127	132	100
80	3	88.9	229	95	229	152	159	121
90	3 1/2	101.6	267	111	267	178	184	140
100	4	114.3	305	127	305	203	210	159
125	5	141.3	381	157	381	254	262	197
150	6	168.3	457	189	457	305	313	237
200	8	219.1	610	252	610	406	414	313
250	10	273	762	316	762	508	518	391
300	12	323.8	914	378	914	609	619	467
350	14	355.6	1067	441	1067	711	711	533
400	16	406.4	1219	505	1219	813	813	610

API 5L bend chemical composition

Grade	C	Si	Mn	P	S	V	Nb	Ti
5L X52	0.16	0.45	1.65	0.020	0.010	0.07	0.05	0.04
5L X56	0.16	0.45	1.65	0.020	0.010	0.07	0.05	0.04
5L X60	0.16	0.45	1.65	0.020	0.010	0.08	0.05	0.04
5L X65	0.16	0.45	1.65	0.020	0.010	0.09	0.05	0.06
5L X70	0.17	0.45	1.75	0.020	0.010	0.10	0.05	0.06

API 5l short radius bend mechanical properties

Grade	Yield Strength	Tensile Strength	Yield to Tensile	Elongation
	min. (KSI)	min. (KSI)	Ratio (max)	%
5L X52	52	66	0.93	21
5L X56	56	71	0.93	19
5L X60	60	75	0.93	19
5L X65	65	77	0.93	18
5L X70	70	82	0.93	17

Can API 5l line return bends be used for high-pressure and high-temperature applications?

Yes, API 5L line return bends can be used for high-pressure and high-temperature applications. Given that they meet the specific requirements outlined in the API 5L standard.
While API 5L primarily focuses on the transportation of fluids, it does not explicitly specify the use of bends or fittings.
When selecting and using Api 5L line return bends, it is essential to consider factors such as the band's material grade, wall thickness, and dimensional specifications. The bend should meet the pressure and temperature ratings required for the specific application.

What are the common methods used for manufacturing API 5l 45 deg bend?

Hot induction bending involves heating the pipe to a high temperature using an induction heating coil. Then an API 5l 45 deg bend is created using bending machines or hydraulic presses.
The cold bending method bends smaller diameter pipes without applying heat. It involves using equipment like a mandrel bending machine or a hydraulic press.
Hydraulic bending utilizes hydraulic force to deform the pipe and achieve the desired Api 5l 45 deg bend.
Rotary draw bending and hot forming are two other methods, typically used for smaller-diameter pipes and thicker-walled pipes respectively.

What are the requirements for testing and certification of API 5l u bend?

The API 5L specification and related standards generally govern the testing and certification requirements for API 5L fittings such as API 5l mitered pipe bend and API 5l U bend. These requirements ensure that the U-bends meet the necessary quality and performance standards for use in various applications.
While the nature of the application, operating conditions, and customer specifications are variables, some common testing and certification requirements are: