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ASTM A795

ASTM-A795-Grade-A​-sprinkler-pipe-supplied-by-Tianjin-United-Steel-Pipe

ASTM A795

ASTM A795 fire sprinkler pipe is a type of carbon steel pipe specifically for 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 wide range of materials, products, systems, and services. ASTM A795 is the standard specification for black and hot-dipped galvanized welded and seamless steel pipe in NPS 1/2 to NPS 10, with wall thickness as given in the table below. This standard covers minimum requirements for material, dimensional tolerances, testing methods, marking requirements, and packaging and labeling requirements for black and hot-dipped galvanized steel pipe. ASTM A795 is an international standard that covers two steel grades, Grade A and Grade B. The weld seam of ERW pipe in grade B must be heat treated after welding to a minimum of 1000℉ (540℃) so that no untempered martensite remains. This is to ensure the strength and durability of the pipe. Otherwise, the pipe may be processed in such a way that no untempered martensite remains. ASTM A795 is an important standard for industries such as oil and gas, where pipes are frequently used. This standard helps to ensure the safety and quality of the pipes used in these industries.

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Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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Steel Grade of ASTM A795

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 DesignatorOutside DiameterNominal Wall ThicknessWeight Plain EndTest Pressure
Furnace-WeldedSeamless and Electric-Resistance-Welded
in.mmin.mmlb/ftkg/mpsiMPapsiMPa
3/41.05(26.7)0.083(2.11)0.86(1.280)500(3.45)700(4.83)
11.315(33.4)0.109(2.77)1.41(2.090)500(3.45)700(4.83)
1.251.66(42.2)0.109(2.77)1.81(2.690)500(3.45)1000(6.89)
1 1/21.9(48.3)0.109(2.77)2.09(3.110)500(3.45)1000(6.89)
22.38(60.3)0.109(2.77)2.64(3.930)500(3.45)1000(6.89)
2 1/22.88(73.0)0.12(3.05)3.53(5.260)500(3.45)1000(6.89)
33.5(88.9)0.12(3.05)4.34(6.460)500(3.45)1000(6.89)
3 1/24(101.6)0.12(3.05)4.98(7.410)500(3.45)1200(8.27)
44.5(114.3)0.12(3.05)5.62(8.370)500(3.45)1200(8.27)
55.56(141.3)0.134(3.40)7.78(11.580)BB1200(8.27)
66.63(168.3)0.134(3.40)9.3(13.850)BB1000(5.51)
88.63(219.1)0.188C(4.78)16.96(25.260)BB800(4.83)
1010.75(273.1)0.188C(4.78)21.23(31.620)BB700(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 DesignatorOutside DiameterNominal Wall ThicknessWeight Plain EndTest Pressure
Furnace-WeldedSeamless and Electric-Resistance-Welded
in.mmin.mmlb/ftkg/mpsiMPapsiMPa
1/20.84(21.3)0.109(2.77)0.85(1.270)700(4.83)700(4.83)
3/41.05(26.7)0.113(2.87)1.13(1.690)700(4.83)700(4.83)
11.32(33.4)0.133(3.38)0.68(2.500)700(4.83)700(4.83)
1  1/41.66(42.2)0.14(3.56)2.27(3.390)1000(6.89)1000(6.89)
1 1/21.9(48.3)0.145(3.68)2.72(4.050)1000(6.89)1000(6.89)
22.38(60.3)0.154(3.91)3.66(5.450)1000(6.89)1000(6.89)
2 1/22.88(73.0)0.203(5.16)5.8(8.640)1000(6.89)1000(6.89)
33.5(88.9)0.216(5.49)7.58(11.290)1000(6.89)1000(6.89)
3 1/24(101.6)0.226(5.74)9.12(13.580)1200(8.27)1200(8.27)
44.5(114.3)0.237(6.02)10.8(16.090)1200(8.27)1200(8.27)
55.56(141.3)0.258(6.55)14.63(21.790)CC1200(8.27)
66.63(168.3)0.28(7.11)18.99(28.290)CC1200(8.27)
88.63(219.1)0.277A(7.04)24.72(36.820)CC1200(8.27)
1010.75(273.1)0.307A(7.80)34.27(51.050)CC1000(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.

Chemical Composition of ASTM A795 Pipe

The ASTM A795 lays out the requirements for each length of pipe to be subjected to a hydrostatic test by the manufacturer. The hydrostatic test is essential in order to ensure that there are no leaks in the pipe wall. This standard also covers the testing of pipe with plain ends, with threads only, or with threads and couplings. The hydrostatic test may be applied to single or multiple lengths, and it is important that all lengths of pipe be tested in order to ensure the quality of the entire batch. By adhering to the ASTM A795 standard, manufacturers can ensure that their pipes meet the necessary requirements and are of the highest quality.

  1. The ASTM A795 material must meet the chemical composition requirements specified in the table below.
  2. The buyer may conduct an analysis of two pipes from each lot of 500 lengths, or a fraction thereof. The chemical composition thus determined must meet the requirements outlined in the table below.
  3. Chemical analysis methods, practices, and definitions must adhere to Test Methods, Practices, and Terminology A 751.
  4. If the analysis of either pipe does not conform to the requirements specified in the table below, analyses on additional pipes from the same lot of double the original number must be performed, each of which must conform to the requirements specified in the table below.
Chemical Requirements
SiCMnPS
Type E (Electric-Resistance-Welded Pipe) & Type S (Seamless Pipe)
Open-Health Electric-Furnace or Basic-Oxygen
Grade A0.250.950.0350.035
Grade B0.31.20.0350.035

Test Requirements of ASTM A795 Pipe

- Hydrotest of ASTM A795 Pipes

The ASTM A795 lays out the requirements for each length of pipe to be subjected to a hydrostatic test by the manufacturer. The hydrostatic test is essential in order to ensure that there are no leaks in the pipe wall. This standard also covers the testing of pipe with plain ends, with threads only, or with threads and couplings. The hydrostatic test may be applied to single or multiple lengths, and it is important that all lengths of pipe be tested in order to ensure the quality of the entire batch. By adhering to the ASTM A795 standard, manufacturers can ensure that their pipes meet the necessary requirements and are of the highest quality. The minimum test pressure is in the Dimension & Size Table above.

- Nondestructive Electric Test of ASTM A795 Pipes

According to ASTM A795, nondestructive electric testing (NDT) can be used as an alternative to the hydrostatic test for black and hot-dipped galvanized steel pipe. NDT is a process that uses electrical current to test for defects in the material without causing damage to the pipe. When accepted by the buyer, each pipe must be tested with an NDT before it can be used in a fire sprinkler system. The use of NDT provides a number of benefits over hydrostatic testing, including shorter testing times and less disruption to the construction schedule. In addition, NDT is more effective at detecting defects in the weld area, making it a more reliable test for ensuring the quality of the pipe. As a result, the use of NDT is becoming increasingly common in the fire sprinkler industry.

- Flattening Test of ASTM A795 Pipes

The standard ASTM A795 requires that a flattening test be performed on pipes to ensure their quality. The test involves flattening a specimen of the pipe, at least 100 mm in length, between two parallel plates. The weld is located either 0 or 90° from the line of direction of force, as required. There are 3 steps to the test:

  1. The first test is for the ductility of the weld, and it is performed by slowly flattening the weld until it breaks. If there are any cracks or breaks on the inside or outside surfaces before the distance between the plates is less than two-thirds of the original outside diameter of the pipe, then the weld is not up to standards and must be fixed.
  2. The second test is for ductility exclusive of the weld, and it is performed in the same way as the first test. However, if there are any cracks or breaks on the inside or outside surfaces before the distance between the plates is less than one-third of the original outside diameter of the pipe, but is not less than five times the wall thickness of the pipe, then the weld is not up to standards and must be fixed.
  3. The third and final test is for soundness, and it is performed by continuing to flatten the weld until it breaks or the opposite walls of the specimen meet. If evidence of laminated or unsound material or incomplete weld is revealed during this test, then the entire welding job must be deemed unsatisfactory.

Coating of ASTM A795 Pipes

ASTM A795 fire sprinkler pipe is required to be galvanized on both the inside and outside to provide adequate protection against corrosion. The zinc coating must be free of any uncoated areas, blisters, flux deposits, or gross dross inclusions. Additionally, any lumps, projections, globules, or heavy deposits of zinc that could interfere with the intended use of the material are not permitted. A fire sprinkler pipe is a critical component in any fire safety system, and it must meet all things for quality and performance.

If the fire sprinkler pipe is coated with zinc, it is required to have a minimum coating weight of 1.5 oz/ft2 (0.46 kg/m2). This is typically accomplished by hot-dip galvanizing, in which the steel is dipped in molten zinc—the zinc coats the outer surface of the pipe, providing a durable barrier against corrosion. The thickness of the coating is essential, as it affects the pipe’s ability to withstand fire. The standard for fire sprinkler pipe is ASTM A795, which specifies a minimum coating thickness of 1.3 oz/ft2 (0.40 kg/m2). This ensures that the pipe will be able to withstand the high temperatures of a fire without fail.

Fire sprinkler pipe is often required to have a protective coating to meet the requirements of the purchaser. The specific type of coating will be agreed upon by the purchaser and the supplier, but some common options include oil, lacquer, enamel, or other materials. To apply the coating, the pipe must first be cleaned of all foreign matter and dried. Once the pipe is prepared, the coating can be applied according to the instructions provided by the manufacturer. This process is essential to ensure that the fire sprinkler pipe meets the necessary standards.

Workmanship, Finish, and Appearance of ASTM A795 Pipes

Fire sprinkler pipe is primarily used to transport water in a fire sprinkler system. In order to be effective, the finished pipe must meet certain standards set forth by the American Society for Testing and Materials (ASTM). Specifically, the pipe must be reasonably straight and free of defects. Any imperfection with a depth greater than 12.5 percent of the specified wall thickness is considered a defect. In addition, all burrs at pipe ends must be removed. These requirements help to ensure that the fire sprinkler pipe will function properly in the event of a fire.

Fire sprinkler pipe is a type of pipe that is commonly used in fire sprinkler systems. The pipe is required to conform to certain practices in order to be used in these systems. For example, each end of the pipe must be plain end unless otherwise specified. Additionally, when threads are specified, they must be manufactured in accordance with ASME B1.20.1 gaging practice and tolerances. Finally, when couplings are specified, they must be manufactured in accordance with Specification A 865. Fire sprinkler pipe must meet these requirements in order to be used in fire sprinkler systems.

Product Marking of ASTM A795 Pipes

A fire sprinkler pipe is a type of steel pipe that is specifically used in fire suppression systems. It is required to be marked with the manufacturer’s name or brand, the type of pipe, the ASTM designation, the length, and the letters “NH” if it has not been hydrostatically tested. This information must be securely attached to each bundle of bundled pipe NPS 112 and smaller. Fire sprinkler pipe is generally made out of black or hot-dipped galvanized steel and it has a diameter range of 6-8 inches. It is important to note that not all steel pipes are suitable for use as Fire sprinkler pipes and it is essential to check with your local fire code restrictions before installation.

When a subsequent processor cuts pipe sections into shorter lengths for resale as material, the processor must transfer complete identifying information to each unmarked cut length, or metal tags securely attached to bundles of unmarked small diameter pipe. The same material designation must be included with the information transferred, as well as the processor’s name, trademark, or brand. By doing this, buyers of the cut pipe can be assured that they are getting quality material that meets their needs.

In addition to the aforementioned standards, barcoding is accepted as a supplementary identifier. The buyer can choose the bar-coding scheme to be utilized for the order.

The Purpose of Painting ASTM A795 Fire Pipes in Red

The purpose of a fire sprinkler system is to provide water to suppress or extinguish a fire. The system is usually located on the roof or the top floors of a building, and the pipes that carry the water are typically painted red so that they are easily visible in the event of a fire. Fire sprinklers are usually activated by heat, and the water is discharged through sprinkler heads that are located throughout the building. In most cases, only the sprinklers closest to the fire will activate, which minimizes water damage. Fire sprinklers are an essential part of any fire safety system, and their use can help to save lives and property.

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