▷ API PIPE MILL LINE | API Pipe Mill for Oil and Gas

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Hydro static Testing
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The integrity of API-grade pipes by detecting leaks and defects using high-pressure water testing

API Pipe Mill Line for Oil and Gas

An API Tube Mill Machine is a sophisticated industrial device specifically designed for manufacturing tubes and pipes that comply with American Petroleum Institute (API) standards. These machines are essential for producing durable, high-quality, and precise pipes that are critical in oil, gas, and other high-pressure applications.

API pipes play a vital role in numerous critical industries. Below is a detailed look at their applications and the importance of adhering to API standards, using more transition words to enhance readability and flow:

Applications of API Pipes

Oil and Gas Pipelines
To begin with, API pipes are indispensable in transporting crude oil, natural gas, and refined products over vast distances. Moreover, these pipelines operate under high pressure, making it essential for the pipes to resist corrosion, mechanical stress, and temperature fluctuations.
Offshore Drilling
In addition, offshore drilling platforms rely heavily on API pipes. Specifically, these pipes must possess exceptional strength and corrosion resistance, as they endure the harsh conditions of marine environments.
Refineries and Petrochemical Plants
Furthermore, API pipes facilitate the movement of chemicals, steam, and water within refineries and chemical plants. Since these environments often involve high temperatures and pressures, the durability of these pipes is of utmost importance.
Structural Applications
Lastly, API pipes are occasionally employed in structural applications. For example, they are used in building oil rigs and other infrastructure where strength and reliability are paramount.

In summary, an API Tube Mill Machine is a sophisticated piece of equipment essential for producing pipes and tubes that meet the stringent requirements of the oil and gas industry.

API Pipe Mill For Oil Transportation

The production capacity of the API Tube Mill Machine is influenced by several factors, including tube diameter, wall thickness, and the type of steel used. Nevertheless, the machine is highly efficient and capable of impressive outputs. For instance:

Daily Output: It can produce up to 300 tons of tubes per day.
Speed: The production speed is adjustable, ranging from 10 meters per minute to 60 meters per minute, thereby providing flexibility for different production requirements.
Operating Efficiency: Additionally, the machine boasts an operating efficiency of up to 95%, ensuring minimal downtime and continuous production.

Steel Strips Specification:

Moreover, the steel strips used in the API Tube Mill Machine must meet strict specifications to guarantee the production of high quality tubes. These specifications include:

Material Type: Hot Rolled Steel (HRS), Cold Rolled Steel (CRS), and other API-compliant steel grades.
Thickness Range: From 4mm to 16mm, catering to a wide variety of applications.
Width Range: Between 600mm and 2000mm, depending on the tube dimensions.
Yield Strength: Ranging from 245 MPa to 485 MPa, ensuring durability and performance under stress.
Coil Weight: Up to 25 tons, allowing for extended production cycles without frequent reloading.

What is an API Tube Mill?

Main production line:
Raw material (steel coil) _uncoiling _ shovel feeding+leveling _ shearing and butt-welding _ horizontal accumulator _ non-power leveling _ roughly forming _ precision forming _ welding seam guide _ extrusion _ high-frequency welding _ deburr device _ medium frequency annealing device _ air cooling device _ water cooling _ sizing _ milling type flying cutting saw _ conveyor
Finishing line:
Conveyor _ straightening _ end facing and beveling machine _ Hydro test _ packaging

Machine Parts Details:
The API Tube Mill Machine comprises several key components, each designed for a specific function in the production process:

Machine parts details

1. Single Head Hydraulic Decoiler
1.1	Structure type	Single side, hydraulic expanding tightly
1.2	I.D. of steel coil	Φ610mm~Φ710mm
1.3	O.D. of steel coil	Φ1300mm~Φ2100mm
1.4	Width of strips	238mm~520mm
1.5	Maxi. Load weight	≤10,000kgs
1.6	Remark	l Coupled with disc brake l Coupled with loading cart

2. Shovel Feeder+Leveling System
2.1	Shovel feeding	l Press coil thread, with extension plate….send coil into leveling unit
2.2	Leveling	l It is used to rough-straighten steel coils and plates before sending them to subsequent processes.
2.3	Structure type	2 units of pinch rollers, 5-roller leveling, fully hydraulic control
2.4	Motor power	11KW
2.5	Pinch feeding speed	10m/min

3. Shear And Butt-welder
3.1	Function	l Cut off the defective part at the beginning and end of the steel strip and the defective part in the middle of the coil. l Cut the head and tail before butt welding, so that the butt welding joints are straight and aligned, which is beneficial to butt welding.
3.2	Structure type	Hydraulic shear + CO₂ welding
3.3	Shear thickness	2.0-6.0mm
3.4	Maximum cutting width	550mm
3.5	Cutter material	6CrW2Si

4. Horizontal Accumulator
4.1	Main composition	It is used to store and drive the strip steel, and consists of horizontal rollers, vertical rollers, center rollers, transition rollers, etc.
4.2	Horizontal rollers	l Divided into 12 equal parts l Roller material: Ф165mm solid type, GCr15, surface hardened, HRC 55-60° l The inner horizontal roller is passive, and the outer horizontal roller is driven by 11 single reduction motors to provide power for the accumulator filling. l There’re transition rollers between the inner and outer horizontal rollers.
4.3	Principle	l Pull in from the outside and discharge from the center l Non-power, pulled out by the power of the main machine.
4.4	Accumulator diameter	Ф7M
4.5	Strip width	238mm~520mm
4.6	Strip thickness	2.0~6.0mm
4.7	Storage capacity	400-1000M
4.8	Motor power	5.5KW×11 SETS

5. Mill-forming Machine
5.1	Feeding guide	Leveling device	l 5-roller leveling, non-power l Shaft material: 40Cr l Adjust type: hand wheel rotation
		Guide vertical rollers	2 units, manual adjustment
		Feeding device	1 station
5.2	Requirements	Round tube range: Ф76-Ф165mm, T=2.0-6.0mm; Square tube range: 50×50mm-130×130mm, T≤5.0mm.
5.3	Roller groups	Horizontal stands	Universal stands	Vertical stands
		5 stations	3 stations	6 stations
5.4	Shaft dia.	Φ140mm	H:Φ140mm/V:Φ100mm	Φ100mm
5.5	Shaft material	42CrMo	42CrMo/40Cr	40Cr
5.6	Transmission shaft	SWC industrial coupling
5.7	Stands material	Q345B steel welding annealing treatment
5.8	Adjust type	l The forming machine is divided into two parts: rough forming and precision forming. l This unit adopts FFX forming process in the rough forming part, so the rough forming rollers can be shared and the roller wear is small. l Change rollers for different tube diameter in precision forming.
5.9	Power transmission	From universal transmission joint to horizontal roller stands
5.10	Driven gearbox	Quantity	8 gearboxes
		Material of gearbox	Q345 steel welding, annealing
		Gear type	Spiral bevel gear (umbrella type)
		Material of gear	20CrMnTi, carburizing and quenching
		Modulus	16 teeth
5.11	Forming machine layout	Anti-pumping device, V, 5-roller leveling, V, H, H, U, U, U, RV, RV, RV, V, H, V, H, V, H “H”represents the horizontal roller stands; “U” represents universal stands; “RV”represents the rotating vertical roller stands; “V”represents the vertical roller stands.

6. HF Welding Machine (IGBT)
6.1	Structure	The high-efficiency switch welder (all-in-one machine) is mainly composed of full-bridge rectifier, filter, modular power module (consisting of high-power IGBT and other power devices), secondary rectifier circuit, inverter circuit (consisting of MOS pipe), load and other components.
6.2	Power	500KW
6.3	Welding speed	Max 50M/min

7. Guiding and Extrude and Scraper
Welding section range	Guiding device, 3-roller extrusion device, scraping welding device, polishing, cooling system
Guide device	Two-roller weld guide device
Extrusion roller device	l Use three-roller extrusion l The rollers on both sides are driven by motors to adjust the worm gear
Scraping device	Double-knife planing, alternate or simultaneous use, no stopping to change the saw, can be quickly raised and lowered, can be adjusted forward and backward and up and down, easy to adjust
Polishing device	Use a flat roller to polish the weld by extrusion

8. Medium Frequency Annealing Device (Online)
8.1	O.D of round tube	Φ76mm~Φ165mm
8.2	Round tube thickness	2.0mm~6.0mm
8.3	Annealing temperature	950 ℃ ± 50 ℃
8.4	Temperature control accuracy	± 4 ℃
8.5	Heating width	30mm
8.6	Power	2×500KW
8.7	Annealing speed	20M/min-50M/min
8.8	Equipment composition	l IF rectifier inverter cabinet, 2sets; l Capacitance output cabinet, 2sets; l Center console, 1 set; l Rocker arm button control box, 2 sets; l Mobile trolley, 2 sets; l Water-water cooling system, 2 sets; l Cables for the connection between the IF rectifier cabinet and inverter cabinet, 2sets; l Thermometer, 1 set; l Gripping mechanism, 2 set.

9. Air Cooling
9.1	Roller table length	50M
9.2	Air-cooled roller table	Active pull-out stable frame, driven by motor 37KW
9.3	Function	Use air cooling to reduce the temperature of the steel pipe to room temperature

10. Water Cooling
10.1	Water cooling tank length	8M
10.2	Structure type	Sink and shower installed in machine bed
10.3	Function	Use water cooling to reduce the temperature of the steel pipe to room temperature

11. Sizing Machine
11.1	Function	Extrude the welded, scratched, calendered and cooled round pipe to the required diameter.
11.2	Requirements	Round tube range: Ф76-Ф165mm, T=2.0-6.0mm; Square tube range: 50×50mm-130×130mm, T≤5.0mm.
11.3	Roller groups	Horizontal stands		Vertical stands
		5 stations		5 stations
11.4	Shaft dia.	Φ140mm		Φ110mm
11.5	Shaft material	42CrMo		40Cr
11.6	Transmission shaft	SWC industrial coupling
11.7	Stands material	35# cast steel, annealing
11.8	Adjust type	l Change rollers for different tube diameter l Flat roller lifting and vertical roller opening/closing, adjusted by AC motor button control box
11.9	Power transmission	From universal transmission joint to horizontal roller stands
11.10	Driven gearbox	Quantity	5 gear boxes
		Material of gearbox	Q345 steel welded, annealing
		Gear type	Spiral bevel gear (umbrella type)
		Material of gear	20CrMnTi
		Modulus	16 teeth

11.11

Sizing machine layout

V, U, V, U, V, U, V, U, V, U, speed measuring roller, 2 Turkish heads;

“V”represents the vertical roller stands;

“U” represents universal stands.

12. Main Driven Motor

12.1

Power

l DC 160KW×2 SETS

l Z4-250-42, 1000/2000rpm

12.2

Reducer model

l ZSY type hardened gear reducer

l 1 SET for forming machine

l 1 SET for sizing machine

13. Milling Type Flying Cutting Saw Φ165×6mm
13.1	Machine basement	Equipped with linear guides, drag chain brackets, buffers, etc.
13.2	Cutting saw structure	4 rollers
13.3	Feeding system	l Profiling track feed system l Polar coordinate system profiling feed l Feed control: AC servo motor, servo drive, 2×1.8KW
13.4	Milling cutting saw	l AC servo motor, variable frequency drive, 2×11KW l Number of saw blades: 2 l Saw blade material: carbide TCT
13.5	Guide roller device	4-roller guide, screw drive, electric adjustment
13.6	Clamp device	Clamping and loosening of the device: hydraulic drive
13.7	Transmission mechanism	Gear rack
13.8	Transmission control	AC servo motor, variable frequency control
13.9	Speed measuring roller device	l Speed roller lowering and lifting: pneumatic drive l Speed sensor: encoder
13.10	Hydraulic pump station	Pressure: 12MPa
13.11	Electrical system	l System composition: operation console, electric control cabinet l Equipped with human-machine interface HMI, motion controller, fieldbus communication, servo drive, remote diagnosis module
13.12	Cut length	6-12M
13.13	Cut length accuracy	±2.0mm

14. Conveyor
14.1	Structure	Roller type
14.2	Length	12M
14.3	Function	For the tube entering into straightening machine smoothly

15. Straightening Machine
15.1	Tube diameter	Φ76~Φ165mm
15.2	Tube thickness	2.0~6.0mm
15.3	Tube length	6-12M
15.4	Straightening speed	Max 30-55m/min
15.5	Coil material	Q235, Q355, GI
15.6	Straightness of pipe end	≤0.2%
15.7	Surface quality	no scratch
15.8	Straightening roller dia.	Φ260mm
15.9	Effective roller length	460mm
15.10	Motor power	37KW×2 sets
15.11	Straightening roller arrangement	l 2-2-2, all active l 1 unit of guide roller