Schedule 80 Steel Pipe Pressure Rating

Pressure Rating Chart for Schedule (SCH) 80 Carbon Steel & Alloy Steel Seamless Pipes:

Steel pipes schedule is marked by ‘Sch’ and is an indicating method represented by ASME/ANSI B36.10. The inside diameter of any steel pipe is crucial, as most are used to transport fluids and gases. Schedule 80 does not refer to the wall thickness of the pipe, but rather a range of wall thicknesses. Different specifications represent varying wall thicknesses for the same diameter. SCH 80 pipe is used in a wide variety of industries and is in high demand. SCH 80 pipe is stronger and heavier than SCH 40 pipe and is primarily used in applications where the pipe must be exposed.

Since more material is required to manufacture Sch 80 carbon steel seamless pipe (measured in millimeters), Sch 80 pipe is more expensive than Sch 40 seamless pipe. Sch 80 pipe is sized to withstand high temperatures and pressures. This makes it an excellent choice for piping applications involving high water temperatures and high pressures. Sch 80 pipe's greater thickness helps it withstand higher PSI pressures. Furthermore, it is considered ideal for industrial chemical applications. The 1 inch Sch 80 pipes thickness is approximately 0.179 and 630 PSI. this number is greater than that of sch 40 PSI and thickness. Hunan Standard Steel Co., Ltd. is a major producer of schedule 80 steel pipes dimensions in mm and has been supplying its products to a wide range of customers across various industries.

Source of SCH 80 Pressure Rating:
The pressure rating of SCH 80 seamless steel pipe is mainly based on the following international standards and engineering specifications. Its technical parameters and design criteria have strict scientific basis and industry consensus:

(1) ASME B36.10 (carbon steel/alloy steel) & B36.19 (stainless steel)
Wall thickness definition: clearly defines the wall thickness size series of SCH 80 to ensure the pressure consistency of different pipe diameters.
Outer diameter standard: specifies the fixed outer diameter corresponding to each NPS (inch system) (for example, the outer diameter of a 2" pipe is always 60.3mm).

(2) ASME B31 series pressure piping specifications
B31.1 (power piping): high temperature and high pressure design criteria for power and boiler systems.
B31.3 (process piping): calculation method for pressure-temperature rating (P-T Rating) in the chemical and petroleum industries.

(3) ASTM material standards
A106 (carbon steel), A312 (stainless steel) and other specified materials have mechanical properties (such as tensile strength and yield strength) that directly affect the allowable stress value.

Schedule (SCH) 80 Pipes Pressure Rating:

Schedule (SCH) 80 Steel Pipe Pressure Rating (psig) at Various Temperatures:
Pipe Size (inches)	Pipe Schedule	Temperature (oF)
		100	200	300	400	500	600	650	700	750
1"	40	3048	2629	2362	2171	2019	1924	1867	1824	1810
	80	4213	3634	3265	3002	2791	2659	2580	2528	2501
	160	6140	5296	4759	4375	4068	3876	3761	3684	3646
1 1/2"	40	2257	1947	1750	1608	1496	1425	1383	1354	1340
	80	3182	2744	2466	2267	2108	2009	1949	1909	1889
	160	4619	3984	3580	3291	3060	2916	2829	2772	2743
2"	40	1902	1640	1474	1355	1260	1201	1165	1141	1129
	80	2747	2369	2129	1957	1820	1734	1682	1648	1631
	160	4499	3880	3486	3205	2980	2840	2755	2699	2671
3"	40	1806	1558	1400	1287	1196	1140	1106	1084	1072
	80	2553	2202	1979	1819	1691	1612	1564	1532	1516
	160	3840	3312	2976	2736	2544	2424	2352	2304	2280
4"	40	1531	1321	1187	1091	1014	967	938	919	909
	80	2213	1909	1715	1577	1466	1397	1355	1328	1314
	160	3601	3106	2791	2566	2386	2273	2206	2161	2138
5"	40	1342	1158	1040	956	889	847	822	805	797
	80	1981	1709	1535	1411	1312	1250	1213	1189	1176
	160	3414	2945	2646	2433	2262	2155	2091	2049	2027
6"	40	1219	1052	945	869	808	770	747	732	724
	80	1913	1650	1483	1363	1267	1208	1172	1148	1136
	160	3289	2836	2549	2343	2179	2076	2014	1973	1953
8"	40	1073	926	832	765	711	678	657	644	637
	80	1692	1459	1311	1205	1121	1068	1036	1015	1005
	160	3175	2738	2460	2262	2103	2004	1944	1905	1885
10"	40	974	840	755	694	645	615	596	584	578
	80	1609	1388	1247	1147	1066	1016	986	966	956
	160	3147	2714	2439	2242	2085	1986	1927	1880	1868

• 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-2 bar

Read more: ASME B36.10 / B36.19 Steel Pipe Dimensions & Sizes or Out Diameter(OD) VS Nominal Diameter(NB)