Pipes for Chemical Equipment are high-performance steel or alloy tubes designed for transporting corrosive and hazardous chemicals in industrial settings. These chemical resistant pipes offer superior corrosion resistance and durability, ensuring safe and efficient operation in chemical processing plants, including pipelines, reactors, and heat exchangers. Conforming to standards like ASTM A312, ASTM A213, and ASME B31.3, they are ideal for petrochemical, pharmaceutical, and wastewater treatment applications. Pipes for Chemical Equipment

Produced through seamless or welded processes, Stainless Steel Pipes (e.g., 304, 316L) and nickel-based alloys (e.g., Inconel, Hastelloy) provide excellent resistance to aggressive chemicals and high temperatures. Available in sizes from 1/2” to 24” (DN15–DN600) with wall thicknesses from SCH 10 to SCH 160, these pipes can be customized with coatings like PTFE or epoxy to enhance durability. Their smooth inner surfaces (Ra ≤ 0.8 µm) minimize friction and prevent material buildup, making them suitable for high-purity applications in pharmaceuticals and food processing.

Corrosion resistant tubes undergo stringent testing, including hydrostatic, ultrasonic, and chemical resistance tests, to ensure compliance with industry standards. With tensile strengths ranging from 485 MPa (316L SS) to 690 MPa (Inconel 625), they withstand mechanical stress and high-pressure conditions. Surface treatments like pickling, passivation, or polymer linings enhance resistance to acids, alkalis, and solvents, reducing maintenance costs and extending service life in harsh chemical environments.

Compared to standard carbon steel pipes, Pipes for Chemical Equipment offer superior chemical compatibility and longevity, making them a cost-effective choice for handling corrosive substances like sulfuric acid, hydrochloric acid, and caustic soda. Their versatility supports high-pressure systems (up to 230 psi for HDPE variants) and cryogenic applications, ensuring reliability across diverse chemical processes.

These industrial piping solutions address challenges like corrosion, leaks, and thermal stress, ensuring safe fluid transport in chemical equipment. Whether used in high-temperature reactors or low-pressure drainage systems, these pipes deliver unmatched performance, safety, and longevity, making them a preferred choice for engineers in demanding industries.

Pipes for Chemical Equipment

Key Benefits

Corrosion Resistance

Resists aggressive chemicals like acids and alkalis, ensuring long-term durability.

High Strength

Withstands high pressures and mechanical stress in demanding applications.

Temperature Tolerance

Performs reliably in extreme high and low temperatures.

Smooth Surface

Reduces friction and prevents material buildup for high-purity applications.

Cost-Effective

Reduces maintenance and replacement costs due to extended service life.

Customizable

Available in various sizes, materials, and coatings to meet specific needs.

Technical Specifications

Explore the dimensional ranges and common applications of various seamless pipe types.

Typical dimensional ranges for seamless steel pipe types
Type	Outer Diameter	Wall Thickness	Length	Applications
Hot-Rolled Seamless	Above 32 mm	2.5 – 200 mm	Up to 12 m	General industrial, structural
Cold-Rolled Seamless	6 – 650 mm	0.25 – 50 mm	Up to 12 m	Precision applications
Thin-Walled Pipe	5 – 100 mm	Less than 0.25 mm	Up to 6 m	Instrumentation, automotive
Heavy Wall Pipe	50 – 650 mm	10 – 200 mm	Up to 12 m	High pressure, structural

Seamless Pipe Specification Chart
DN	NB (inch)	OD (mm)	Nominal Wall Thickness (mm)
DN	NB (inch)	OD (mm)	SCH10	SCH20	SCH30	STD	SCH40	SCH60	XS	SCH80	SCH100	SCH120	SCH140	SCH160	XXS
15	1/2"	21.3	2.11		2.41	2.77	2.77		3.73	3.73				4.78	7.47
20	3/4"	26.7	2.11		2.41	2.87	2.87		3.91	3.91				5.56	7.82
25	1"	33.4	2.77		2.90	3.38	3.38		4.55	4.55				6.35	9.09
32	1.1/4"	42.2	2.77		2.97	3.56	3.56		4.85	4.85				6.35	9.70
40	1.1/2"	48.3	2.77		3.18	3.68	3.68		5.08	5.08				7.14	10.15
50	2"	60.3	2.77		3.18	3.91	3.91		5.54	5.54				8.74	11.07
65	2.1/2"	73	3.05		4.78	5.16	5.16		7.01	7.01				9.53	14.02
80	3"	88.9	3.05		4.78	5.49	5.49		7.62	7.62				11.13	15.25
90	3.1/2"	101.6	3.05		4.78	5.74	5.74		8.08	8.08
100	4"	114.3	3.05		4.78	6.02	6.02		8.56	8.56				13.49	17.12
125	5"	141.3	3.4			6.55	6.55		9.53	9.53		12.7		15.88	19.05
150	6"	168.3	3.4			7.11	7.11		10.97	10.97		14.27		18.26	21.95
200	8"	219.1	3.76	6.35	7.04	8.18	8.18	10.31	12.7	12.7	15.09	18.26	20.62	23.01	22.23
250	10"	273	4.19	6.35	7.8	9.27	9.27	12.7	12.7	15.09	18.26	21.44	25.4	28.58	25.4
300	12"	323.8	4.57	6.35	8.38	9.53	10.31	14.27	12.7	17.48	21.44	25.4	28.58	33.32	25.4
350	14"	355.6	6.35	7.92	9.53	9.53	11.13	15.09	12.7	19.05	23.83	27.79	31.75	35.71
400	16"	406.4	6.35	7.92	9.53	9.53	12.7	16.66	12.7	21.44	26.19	30.96	36.53	40.19
450	18"	457.2	6.35	7.92	11.13	9.53	14.27	19.05	12.7	23.83	39.36	34.93	39.67	45.24
500	20"	508	6.35	9.53	12.7	9.53	15.09	20.62	12.7	26.19	32.54	38.1	44.45	50.01
550	22"	558.8	6.35	9.53	12.7	9.53		22.23	12.7	28.58	34.93	41.28	47.63	53.98
600	24"	609.6	6.35	9.53	14.27	9.53	17.48	24.61	12.7	30.96	38.89	46.02	52.37	59.54
650	26"	660.4	7.92	12.7		9.53			12.7
700	28"	711.2	7.92	12.7	15.88	9.53			12.7
750	30"	762	7.92	12.7	15.88	9.53			12.7
800	32"	812.8	7.92	12.7	15.88	9.53	17.48		12.7
850	34"	863.6	7.92	12.7	15.88	9.53	17.48		12.7
900	36"	914.4	7.92	12.7	15.88	9.53	19.05		12.7

Seamless Pipes

Minimum Thickness

Seamless pipes, available in various wall thicknesses, are designed for precise applications, with cold-rolled thin-walled pipes achieving thicknesses as low as 0.25 mm or less.

The outer diameter of hot-rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-200mm, the outer diameter of cold-rolled seamless steel pipe can be 6mm, the wall thickness can be 0.25mm, the outer diameter of thin-walled pipe can be 5mm, and the wall thickness is less than 0.25mm, cold rolling

The ability to produce seamless pipes with ultra-thin walls and controlled ovality makes them critical for industries like automotive, hydraulics, and petrochemicals, ensuring reliability and performance.

Permissible Variations in Outside Diameter of Steel Pipes
NPS/ DN/ OD	Permissible Variations in Outside Diameter
	Over		Under
	in.	mm	in.	mm
NPS 1/8 to 1½, incl DN 6 to 40 OD 10.3 to 48.3, mm	1/64	0.4	1/64	0.4
Over 1½ to 4, incl DN 40 to 100 OD 48.3 to 114.3, mm	1/32	0.8	1/32	0.8
Over 4 to 8, incl DN 100 to 200 OD 114.3 to 219.1, mm	1/16	1.6	1/32	0.8
Over 8 to 18, incl DN 200 to 450 OD 219.1 to 457, mm	3/32	2.4	1/32	0.8
Over 18 to 26, incl DN 450 to 650 OD 457 to 660, mm	1/8	3.2	1/32	0.8

According to the production method, seamless tubes are divided into hot - rolled tubes, cold - rolled tubes, cold - drawn tubes, extruded tubes, jacking tubes, etc. The maximum diameter is 650 mm and the minimum diameter is 0.3 mm. Depending on the application, there are thick - walled tubes and thin - walled tubes. Seamless steel tubes are mainly used as petroleum geological drilling tubes, cracking tubes for petrochemical industry, boiler tubes, bearing tubes and high - precision structural steel tubes for automobiles, tractors and aviation. In the plate, Q345B seamless steel pipe belongs to the low - alloy series.

Among the low - alloy materials, this kind of material is the most common. The outside diameter of hot - rolled seamless pipe is usually more than 32mm, the wall thickness is 2.5 - 200mm, the outside diameter of cold - rolled seamless steel pipe can be 6mm, the wall thickness can be 0.25mm, the outside diameter of thin - walled pipe can be 5mm, and the wall thickness is less than 0.25mm, cold rolling has higher dimensional accuracy than hot rolling.

Common Standards for Seamless Pipes

A consolidated overview of international seamless pipe standards, their materials, and applications.

Overview of Seamless Pipe Standards from ASTM, API, JIS, and GB
Standard System	Standard Code	Material Type	Typical Applications
ASTM / ASME (USA)	ASTM A53	Carbon Steel	General-purpose piping, structural
	ASTM A106	Carbon Steel	High-temperature service
	ASTM A179	Low Carbon Steel	Heat exchangers, condensers
	ASTM A333	Carbon/Alloy Steel	Low-temperature service
	ASTM A335	Alloy Steel	High-temperature, pressure piping
	ASTM A213 / A209	Alloy/Stainless Steel	Boilers, superheaters
	ASTM A312	Stainless Steel	Corrosion-resistant piping
	ASTM A519	Carbon/Alloy Steel	Mechanical tubing (e.g., SAE 1026)
	ASTM A790	Duplex Stainless Steel	High-strength, corrosion-resistant service
API (Oil & Gas)	API 5L	Carbon Steel	Oil & gas pipelines
API (Oil & Gas)	API 5CT	Carbon Steel	Casing & tubing for wells
JIS (Japan)	JIS G3454/G3455/G3456	Carbon Steel	Pressure piping service
	JIS G3460	Carbon Steel	Boilers, heat exchangers
	JIS G3429	High-strength Steel	High-pressure gas cylinders
GB (China)	GB 3087	Carbon Steel	Low & medium pressure boilers
	GB 5310	Carbon Steel	High-pressure boiler pipes
	GB/T 8163	Carbon Steel	Fluid and structural use

A seamless pipe is made from a solid billet pierced and drawn into a tube without welding. This gives it a uniform structure and higher pressure resistance compared to welded pipes.

The process involves heating a billet and rotary piercing it, followed by hot rolling, cold rolling, or cold drawing to achieve diameter and thickness.

Seamless pipes have no weld seam, giving them higher strength (~20% more pressure capacity), uniform thickness, and better corrosion resistance. Welded pipes are cheaper, available in large diameters and lengths, but the seam can be a weak point.

They can be made of carbon steel, alloy steel, and stainless steel, depending on the application requirements.

Common specs include ASTM A106, A53, A333, A335, A213, API 5L, and EN 10216‑2 for carbon, alloy, and stainless seamless pipes.

Used in oil & gas transmission, well casings, boilers, heat exchangers, structural piping, hydraulic cylinders, automotive, aerospace, power plants, chemical industries, and water systems.

Diameters range from ⅛″ to ~26″; wall thickness schedule SCH 10–160. Lengths: 6 m, 12 m or custom; finishes include natural, varnished, black paint, FBE, 3PE, with plastic or iron caps.

Yes.
Due to complex manufacturing, seamless pipes are typically pricier than welded, but offer higher performance and durability.

Yes.
Seamless pipes can substitute welded pipes in most applications, but welded pipes cannot always replace seamless in high-pressure/temperature situations.

Production becomes uneconomical and equipment-limited above ~24–26″ OD, so seamless pipes larger than that are rare or made via special hot-expansion processes.

Industry Applications

Seamless pipes are critical in various industries thanks to their excellent strength, temperature resistance, and structural uniformity. They ensure safe and efficient performance in demanding environments.

Power Generation

Used in steam pipelines, boiler tubes, superheaters, and heat exchangers for high-temperature and high-pressure conditions in power plants.

Oil & Gas Industry

Transports crude oil, natural gas, and petroleum products in pipelines and refinery units, handling high-pressure and corrosion.

Chemical & Petrochemical

Handles chemicals, gases, and hazardous substances in reactors and heat exchangers, ensuring safe processing.

Mechanical & Automotive

Applied in automotive systems and machinery for fluid conveyance and precision components requiring strength and accuracy.

Construction & Structural

Used in structural support, water and sewage systems, and building frameworks for strength and corrosion resistance.

Marine & Shipbuilding

Utilized in hydraulic and engine systems onboard, resisting corrosion in marine environments.

Aerospace & Defense

Employed in aircraft and military equipment for hydraulic systems and structural components.

Food & Pharmaceuticals

Stainless pipes for hygienic transport of food and pharmaceutical products, maintaining sterility.

Mining & Slurry Transport

Designed for transporting slurries and chemicals in mining, withstanding abrasion and harsh conditions.

Pipes for Chemical Equipment

Pipes for Chemical Equipment