Stainless Steel Pipe Dimensions And Chart

When we ask for price from stainless steel pipe suppliers, they will ask you about the pipe parameters. If you don't know these parameters and specifications, you may buy the wrong stainless steel pipe product that doesn't match your project. So, what are the parameters of steel pipe size?

 

Stainless Steel Pipe Dimension Parameter

 

Stainless steel pipe parameters include outside diameter, diameter, wall thickness, length (6 m for 20 ft, 12 m for 40 ft), end type, material grade, manufacturing standard, and SMLS/WELDED.

 

Once you know these pipe parameters, you can calculate the weight of the pipe, the price per foot or per meter, and the pressure the pipe can withstand.

 

Stainless Steel Pipe Dimension Chart

 

 

In the steel pipe size specification chart, each parameter has a specific range to ensure the quality and safety of the steel pipe.

 

ASME B36.19：Dimension for Stainless Steel Pipes

 

DN	NPS	OD(mm)	Sch5S	Sch10S	Sch40S	Sch80S	Sch10	Sch20	Sch30	Sch40	STD	Sch60	Sch80	XS	Sch100	Sch120	Sch140	Sch160	XXS
6	1/8	10.3		1.24	1.73	2.41	1.24		1.45	1.73	1.73		2.41	2.41
8	1/4	13.7		1.65	2.24	3.02	1.65		1.85	2.24	2.24		3.02	3.02
10	3/8	17.1		1.65	2.31	3.2	1.65		1.85	2.31	2.31		3.2	3.2
15	1/2	21.3	1.65	2.11	2.77	3.73	2.11		2.41	2.77	2.77		3.73	3.73				4.78	7.47
20	3/4	26.7	1.65	2.11	2.87	3.91	2.11		2.41	2.87	2.87		3.91	3.91				5.56	7.82
25	1	33.4	1.65	2.77	3.38	4.55	2.77		2.90	3.38	3.38		4.55	4.55				6.35	9.09
32	1 1/4	42.2	1.65	2.77	3.56	4.85	2.77		2.97	3.56	3.56		4.85	4.85				6.35	9.7
40	1 1/2	48.3	1.65	2.77	3.68	5.08	2.77		3.18	3.68	3.68		5.08	5.08				7.14	10.15
50	2	60.3	1.65	2.77	3.91	5.54	2.77		3.18	3.91	3.91		5.54	5.54				8.74	11.07
65	2 1/2	73	2.11	3.05	5.16	7.01	3.05		4.78	5.16	5.16		7.01	7.01				9.53	14.02
80	3	88.9	2.11	3.05	5.49	7.62	3.05		4.78	5.49	5.49		7.62	7.62				11.13	15.24
90	3 1/2	101.6	2.11	3.05	5.74	8.08	3.05		4.78	5.74	5.74		8.08	8.08
100	4	114.3	2.11	3.05	6.02	8.56	3.05		4.78	6.02	6.02		8.56	8.56		11.13		13.49	17.12
125	5	141.3	2.77	3.40	6.55	9.53	3.40			6.55	6.55		9.53	9.53		12.7		15.88	19.05
150	6	168.3	2.77	3.40	7.11	10.97	3.40			7.11	7.11		10.97	10.97		14.27		18.26	21.95
200	8	219.1	2.77	3.76	8.18	12.7	3.76	6.35	7.04	8.18	8.18	10.31	12.70	12.70	15.09	18.26	20.62	23.01	22.23
250	10	273.1	3.40	4.19	9.27	12.7	4.19	6.35	7.8	9.27	9.27	12.7	15.09	12.70	18.26	21.44	25.4	28.58	25.40
300	12	323.9	3.96	4.57	9.53	12.7	4.57	6.35	8.38	10.31	9.53	14.27	17.48	12.70	21.44	25.4	28.58	33.32	25.40
350	14	355.6	3.96	4.78	9.53	12.7	6.35	7.92	9.53	11.13	9.53	15.09	19.05	12.70	23.83	27.79	31.75	35.71
400	16	406.4	4.19	4.78	9.53	12.7	6.35	7.92	9.53	12.70	9.53	16.66	21.44	12.70	26.19	30.96	36.53	40.49
450	18	457	4.19	4.78	9.53	12.7	6.35	7.92	11.13	14.27	9.53	19.05	23.83	12.70	29.36	34.93	39.67	45.24
500	20	508	4.78	5.54	9.53	12.7	6.35	9.53	12.70	15.09	9.53	20.62	26.19	12.70	32.54	38.1	44.45	50.01
550	22	559	4.78	5.54			6.35	9.53	12.70		9.53	22.23	28.58	12.70	34.93	41.28	47.63	53.98
600	24	610	5.54	6.35	9.53	12.7	6.35	9.53	14.27	17.48	9.53	24.61	30.96	12.70	38.89	46.02	52.37	59.54
650	26	660					7.92	12.7			9.53			12.70
700	28	711					7.92	12.7	15.88		9.53			12.70
750	30	762	6.35	7.92			7.92	12.7	15.88		9.53			12.70
800	32	812.8					7.92	12.7	15.88	17.48	9.53			12.70
850	34	863.6					7.92	12.7	15.88	17.48	9.53			12.70
900	36	914.4					7.92	12.7	15.88	19.05	9.53			12.70
	38	965.2									9.53			12.70
1000	40	1016									9.53			12.70
1050	42	1066.8									9.53			12.70
1100	44	1117.6									9.53			12.70
	46	1168.4									9.53			12.70
1200	48	1219.2									9.53			12.70

 

Steel Pipe Dimension Standard

 

The commonly used size standards for steel pipes are divided into ASME B36.10 and ASME B36.19.

 

ASME B36.10: This is the most fundamental and widely used dimensional standard for industrial piping. It specifies the dimensions (outer diameter and wall thickness) of welded and seamless pipe made of carbon steel, alloy steel, and stainless steel for conveying fluids. Its nominal pipe sizes range from NPS 1/8 to NPS 80. This standard defines a standard series of wall thicknesses, the most commonly used of which include Sch 5, Sch 10, Sch 20, Sch 40, Sch 80, Sch 120, Sch 160, and Sch XXS.

 

ASME B36.19: This supplementary standard, B36.10, specifically addresses stainless steel and nickel alloy piping. This standard specifies the dimensions (outside diameter and wall thickness) of welded and seamless stainless steel and nickel alloy pipe, suitable for thin-walled pipe in corrosive conditions. The size range covered is smaller than B36.10, typically ranging from NPS 1/8 to NPS 30. It also defines wall thickness series for stainless steel and corrosion-resistant alloys, particularly thin-wall series: Sch 5S, Sch 10S, Sch 20, Sch 40S, Sch 80S, etc.

 

Common Steel Pipe Dimensions

 

Nominal Pipe Size (NPS): NPS is a designation used to identify steel pipe sizes. It is not an exact measurement of the pipe's actual inside or outside diameter. NPS is the core designation used to standardize and simplify the dimensions of connections between pipes, fittings (such as elbows, tees, and flanges), valves, and other components within a piping system. All pipes, fittings, and valves with the same NPS have a uniform outside diameter at their connecting ends, ensuring they can mate and connect.

 

 

Nominal Diameter (DN): DN is the nominal size designation used within the ISO/DIN system and is fully equivalent to NPS. DN is used to standardize the connection sizes of piping system components and is typically calculated by multiplying NPS by 25 and rounding to the nearest whole number.

• DN = NPS x 25

  
  

• NPS = DN / 25

 

 

NPS and DN correspond to each other; each NPS has a corresponding DN.

 

Outside Diameter (OD): This refers to the actual measured diameter of the outer circumference of the pipe wall. It is a key physical dimension of the pipe.

 

Wall Thickness: Pipe wall thickness refers to the actual physical thickness of the pipe wall. In the ASME B36.19 standard, stainless steel pipe wall thickness is standardized by pipe schedule and must be suffixed with "S" to distinguish it from carbon steel pipe (B36.10).

 

Inside Diameter (ID): The inside diameter is the actual physical measurement of the inside circumference of the pipe wall. It is not a standardized designation but rather calculated:

• ID = OD - (2 x Wall Thickness)

 

 

SCH for Stainless Steel Pipe Dimension

 

"SCH" is the schedule in steel pipe dimensions. It’s a standardized system used to define the wall thickness of pipes relative to their nominal size. Developed by the American Standards Association, schedules range from SCH 5 to SCH XXS at the extreme end.

 

SCH is not a direct measurement. Instead, it's a code representing a pipe's standardized wall thickness for a given Nominal Pipe Size (NPS). And SCH correlates loosely with a pipe's pressure-containing capacity. Higher SCH numbers generally indicate thicker walls and higher pressure.

 

The formula behind SCH is derived from historical standards:

 

SCH = \frac{1000 \times P}{S}

•  P: Maximum allowable working pressure (psi)

  
  

• S: Allowable stress of the pipe material (psi)

 

This means two pipes with the same SCH number will have different actual wall thicknesses for different NPS sizes but similar pressure-bearing capabilities.

 

Same NPS + Same SCH = Same OD, but pipes with the same NPS share the exact same outer diameter (OD), regardless of SCH. Thicker walls (higher SCH) reduce the inner diameter (ID).

 

 

Example 1: Schedule 40 Steel Pipe Dimensions

 

Schedule 40 Steel Pipe is a carbon steel/alloy steel pipe wall thickness grade that complies with the ASME B36.10 standard. It belongs to the Standard Weight (STD) grade and is widely used in medium and low pressure industrial piping systems.

 

SCH 40 is a medium wall thickness, between SCH 10 and SCH 80. At the same NPS, SCH 40 has a thinner wall thickness than SCH 80 but thicker than SCH 10.

 

Example 2: Schedule 80 Steel Pipe Dimensions

Schedule 80 steel pipe is the thick-walled carbon steel pipe standardized under ASME B36.10, for high-pressure, high-stress applications. 

 

 

How To Get Stainless Steel Pipe Quote?

 

For example: ASTM B163 Incoloy 825 Seamless Tubes, OD = 25.4mm, Wall Thickness = 2.11m, Length = 6000mm, Quantity = 100PCS.

 

•  Availability and delivery lead time. 

  
  

• Mill Test Certificate (MTC).

  
  

• Country of origin / Mill name.

  
  

• Price (FOB) and packing specification.

  
  

• Reference photo if available.

 

Or: SMLS pipe ALLOY C276 size: 6", SCH 40S, QTY 6M.

 

Get a quick quote