About ASTM A795 Standard

Dec 08, 2023

ASTM A795 Standard

ASTM A795 fire sprinkler pipe is a carbon steel pipe specially used in fire sprinkler systems. The American Society for Testing and Materials (ASTM) is an international standards organization that develops and publishes voluntary consensus technical standards for a variety of materials, products, systems, and services. ASTM A795 is the standard specification for black and hot-dip galvanized welded and seamless steel pipe in sizes NPS 1/2 to NPS 10 with wall thicknesses as shown in the table below. The standard covers materials, dimensional tolerances, test methods, marking requirements and minimum requirements for packaging and labeling of black and hot-dip galvanized steel pipes. ASTM A795 is an international standard covering two steel grades, Grade A and Grade B. Welds of Class B ERW pipe must be heat treated to a minimum of 1000°F (540°C) after welding so that no untempered martensite remains. This is to ensure the strength and durability of the pipe. Otherwise, the tube can be processed in such a way that no untempered martensite remains. ASTM A795 is an important standard for industries such as oil and gas that frequently use pipelines. This standard helps ensure the safety and quality of pipes used by these industries.

DIMENSIONS AND SIZES OF ASTM A795 PIPE

TABLE 1 Dimensions, Weights, and Test Pressure for Light-Weight Fire Protection ASTM A795 Pipe—Schedule 10A
NPS Designator	Outside Diameter		Nominal Wall Thickness		Weight Plain End		Test Pressure
	Outside Diameter		Nominal Wall Thickness		Weight Plain End		Furnace-Welded		Seamless and Electric-Resistance-Welded
	Inch	mm	Inch	mm	lb/ft	kg/m	psi	MPa	psi	MPa
3/4	1.05	-26.7	0.083	-2.11	0.86	-1.28	500	-3.45	700	-4.83
1	1.315	-33.4	0.109	-2.77	1.41	-2.09	500	-3.45	700	-4.83
1 1/4	1.66	-42.2	0.109	-2.77	1.81	-2.69	500	-3.45	1000	-6.89
1 1/2	1.9	-48.3	0.109	-2.77	2.09	-3.11	500	-3.45	1000	-6.89
2	2.38	-60.3	0.109	-2.77	2.64	-3.93	500	-3.45	1000	-6.89
2 1/2	2.88	-73	0.12	-3.05	3.53	-5.26	500	-3.45	1000	-6.89
3	3.5	-88.9	0.12	-3.05	4.34	-6.46	500	-3.45	1000	-6.89
3 1/2	4	-101.6	0.12	-3.05	4.98	-7.41	500	-3.45	1200	-8.27
4	4.5	-114.3	0.12	-3.05	5.62	-8.37	500	-3.45	1200	-8.27
5	5.56	-141.3	0.134	-3.4	7.78	-11.58	B	B	1200	-8.27
6	6.63	-168.3	0.134	-3.4	9.3	-13.85	B	B	1000	-5.51
8	8.63	-219.1	0.188C	-4.78	16.96	-25.26	B	B	800	-4.83
10	10.75	-273.1	0.188C	-4.78	21.23	-31.62	B	B	700	-6.89
A：Schedule 10 corresponds to Schedule 10S as listed in ANSI B 36.19 for NPS 3⁄4 through 6 only.
B：Furnace-welded pipe is not made in sizes larger than NPS 4.
C：Not Schedule 10.

TABLE 2 Dimensions, Weights, Test Pressures for Standard-Weight Fire Protection ASTM A795 Pipe—Schedule 30 and Schedule 40
NPS Designator	Outside Diameter		Nominal Wall Thickness		Weight Plain End		Test Pressure
NPS Designator	Outside Diameter		Nominal Wall Thickness		Weight Plain End		Furnace-Welded		Seamless and Electric-Resistance-Welded
	Inch	mm	Inch	mm	lb/ft	kg/m	psi	MPa	psi	MPa
1/2	0.84	-21.3	0.109	-2.77	0.85	-1.27	700	-4.83	700	-4.83
3/4	1.05	-26.7	0.113	-2.87	1.13	-1.69	700	-4.83	700	-4.83
1	1.32	-33.4	0.133	-3.38	0.68	-2.5	700	-4.83	700	-4.83
1 1/4	1.66	-42.2	0.14	-3.56	2.27	-3.39	1000	-6.89	1000	-6.89
1 1/2	1.9	-48.3	0.145	-3.68	2.72	-4.05	1000	-6.89	1000	-6.89
2	2.38	-60.3	0.154	-3.91	3.66	-5.45	1000	-6.89	1000	-6.89
2 1/2	2.88	-73	0.203	-5.16	5.8	-8.64	1000	-6.89	1000	-6.89
3	3.5	-88.9	0.216	-5.49	7.58	-11.29	1000	-6.89	1000	-6.89
3 1/2	4	-101.6	0.226	-5.74	9.12	-13.58	1200	-8.27	1200	-8.27
4	4.5	-114.3	0.237	-6.02	10.8	-16.09	1200	-8.27	1200	-8.27
5	5.56	-141.3	0.258	-6.55	14.63	-21.79	C	C	1200	-8.27
6	6.63	-168.3	0.28	-7.11	18.99	-28.29	C	C	1200	-8.27
8	8.63	-219.1	0.277A	-7.04	24.72	-36.82	C	C	1200	-8.27
10	10.75	-273.1	0.307A	-7.8	34.27	-51.05	C	C	1000	-6.89
A：NPS 1⁄2 through 6—Schedule 40; NPS 8 and 10—Schedule 30.
B：Based on 20-ft (6.1-m) lengths.
C：Furnace-welded pipe is not made in sizes larger than NPS 4.

TABLE 3 Chemical Requirements
Si	C	Mn	P	S
Type E (Electric-Resistance-Welded Pipe) & Type S (Seamless Pipe)
Open-Health Electric-Furnace or Basic-Oxygen
Grade A	0.25	0.95	0.035	0.035
Grade B	0.3	1.2	0.035	0.035