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ASTM A795 PIPE

ASTM A795 Fire Protection Pipe

 

ASTM A795/A795M fire sprinkler pipe and industrial pipes are specific types of carbon steel pipes designed for fire sprinkler systems, following the standards set by the American Society for Testing and Materials (ASTM).

 

ASTM A795 specification covers black and hot-dipped galvanized welded and seamless steel pipe in NPS 1/2 to NPS 10,inclusive (DN 15 to DN 250),intended for use in fire protection systems. 

Type F-Furnace-butt welded, continuous welded
Type E-Electric-resistance-welded
Type S-Seamless.

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size of ASTM A795 Fire Protection Pipe

 

Dimensions, Weights, and Test Pressure For Light-Weight Fire Protection Pipe-Schedule 10A
  Test Pressure
NPS
Designator		 DN
Designator		 Outside Diameter Nominal Wall Thickness Weight Plain End Furnace-Welded Seamless and
Electric-Resistance-Welded
    in. mm in. mm lb /ft kg/m psi kPa psi kPa
3/4 20 1.050 [26.7] 0.083 [2.11] 0.83 [1.28] 500 [3400] 700 [4800]
1 25 1.315 [33.4] 0.109 [2.77] 1.41 [2.09] 500 [3400] 700 [4800]
1 1/4 32 1.660 [42.2] 0.109 [2.77] 1.81 [2.69] 500 [3400] 1000 [6900]
1 1/2 40 1.900 [48.3] 0.109 [2.77] 2.09 [3.11] 500 [3400] 1000 [6900]
2 50 2.375 [60.3] 0.109 [2.77] 2.64 [3.93] 500 [3400] 1000 [6900]
2 1/2 65 2.875 [73.0] 0.120 [3.05] 3.53 [5.26] 500 [3400] 1000 [6900]
3 80 3.500 [88.9] 0.120 [3.05] 4.34 [6.46] 500 [3400] 1000 [6900]
3 1/2 90 4.000 [101.6] 0.120 [3.05] 4.98 [7.41] 500 [3400] 1200 [8300]
4 100 4.500 [114.3] 0.120 [3.05] 5.62 [8.37] 500 [3400] 1200 [8300]
5 125 5.563 [141.3] 0.134 [3.40] 7.78 [11.58] B B 1200 [8300]
6 150 6.625 [168.3] 0.134 [3.40] 9.30 [13.85] B B 1000 [6900]
8 200 8.625 [219.1] 0.188C [4.78] 16.96 [25.26] B B 800 [5500]
10 250 10.750 [273.1] 0.188C [4.78] 21.23 [31.62] B B 700 [4800]
  • A Schedule 10 corresponds to Schedule 10S as listed in ANSI B36.19 for NPS 3/4 through 6 [DN 20 through 150] only.
  • B Furnace-welded pipe is not made in sizes larger than NPS 4 [DN 100].
  • C Not Schedule 10.

 

Dimensions, Weights, Test Pressures For Standard-Weight Fire Protection Pipe-Schedule 30 and Schedule 40
  Test Pressure
NPS
Designator		 DN
Designator		 Specified Outside
Diameter		 Nominal Wall
ThicknessA		 Weight Plain End Weight Threaded
and CoupledB		 Furnace-Welded Seamless and
Electric-Resistance-Welded
    in. mm in. mm lb/ft kg/m lb/ft kg/m psi kPa psi kPa
1/2 15 0.84 [21.3] 0.109 [2.77] 0.85 [1.27] 0.85 [1.27] 700 [4800] 700 [4800]
3/4 20 1.05 [26.7] 0.113 [2.87] 1.13 [1.69] 1.13 [1.68] 700 [4800] 700 [4800]
1 25 1.315 [33.4] 0.133 [3.38] 1.68 [2.50] 1.68 [2.50] 700 [4800] 700 [4800]
11/4 32 1.66 [42.2] 0.140 [3.56] 2.27 [3.39] 2.28 [3.40] 1000 [6900] 1000 [6900]
11/2 40 1.9 [48.3] 0.145 [3.68] 2.72 [4.05] 2.73 [4.07] 1000 [6900] 1000 [6900]
2 50 2.375 [60.3] 0.154 [3.91] 3.66 [5.45] 3.69 [5.50] 1000 [6900] 1000 [6900]
21/2 65 2.875 [73.0] 0.203 [5.16] 5.80 [8.64] 5.83 [8.68] 1000 [6900] 1000 [6900]
3 80 3.5 [88.9] 0.216 [5.49] 7.58 [11.29] 7.62 [11.35] 1000 [6900] 1000 [6900]
31/2 90 4 [101.6] 0.226 [5.74] 9.12 [13.58] 9.21 [13.71] 1200 [8300] 1200 [8300]
4 100 4.5 [114.3] 0.237 [6.02] 10.80 [16.09] 10.91 [16.25] 1200 [8300] 1200 [8300]
5 125 5.563 [141.3] 0.258 [6.55] 14.63 [21.79] 14.82 [22.07] C C 1200 [8300]
6 150 6.625 [168.3] 0.280 [7.11] 18.99 [28.29] 19.2 [28.60] C C 1200 [8300]
8 200 8.625 [219.1] 0.277A [7.04] 24.72 [36.82] 25.57 [38.09] C C 1200 [8300]
10 250 10.75 [273.1] 0.307A [7.80] 34.27 [51.05] 35.78 [53.29] C C 1000 [6900]
  • A NPS 1/2 through 6 [DN 15 through 150]- Schedule 40; NPS 8 and 10 [DN 200 and 250]-Schedule 30.
  • B Based on 20-ft [6.1-m] lengths.
  • C Furnace-welded pipe is not made in sizes larger than NPS 4 [DN 100].

 

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Chemical Requirements of ASTM A795 Fire Protection Pipe

 

  • The ASTM A795 steel material shall conform to the requirements as to chemical composition specified in the table on the right
  • An analysis of two pipes from each lot of 500 lengths,or fraction thereof, may be made by the purchaser. The chemical composition thus determined shall conform to therequirements specified in the table on the right
  • Chemical analysis methods, practices, and definitions must adhere to Test Methods, Practices, and Terminology A 751.
  • If the analysis of either pipe does not conform to the requirements specified in the table on the right, analyses shall be made on additional pipes of double the original number from the same lot, each of which shall conform to the requirements specified in the table on the right
  Composition, max, %
  C Mn P S
Type E(electric-resistance-welded pipe) & Type S(seamless pipe)
Open-hearth, 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
Type F (furnace-welded pipe)
Open-hearth, electric-furnace, or basic oxygen 0.050 0.045

Test Requirements Of ASTM A795 Fire Protection Pipe

Hydrostatic Test Of ASTM A795 pipe

The hydrostatic test (hydrotest) is a mandatory pressure test to verify the pipe's ability to withstand internal pressure without leakage or structural failure.
Acceptance Criteria:
Zero leakage: No weeping, sweating, or pressure drop .
Exemptions: Pipes that pass the nondestructive electric test may be exempt from the hydrostatic test, as per the standard.

Nondestructive Electric Test Of ASTM A795 pipe

This test is a non-destructive method to detect surface or near-surface defects (e.g., cracks, seams, or discontinuities) in the pipe, typically using eddy current or ultrasonic testing. It can replace the hydrostatic test if specified.
Acceptance Criteria:
No significant defects (e.g., cracks, holes, or large inclusions) are allowed.
The test must be calibrated using reference standards (e.g., pipes with artificial defects) to ensure accuracy.


Flattening Test Of ASTM A795 pipe

Purpose: The flattening test evaluates the ductility and weld quality (for welded pipes) by compressing a pipe segment until its walls are flattened, checking for cracks or brittleness.
Sampling: 1 test per 500 pipes (or lot) for welded pipes .
Acceptance Criteria:
No cracks, splits, or breaks are allowed in the pipe body or weld (if welded) during or after flattening.
Minor surface irregularities (e.g., slight creases) that do not affect structural integrity are acceptable.

Coating Of ASTM A795 Fire Protection Pipe

fire steel pipe

 

 

 

  • The weight of the zinc coating shall not be less than1.5 oz/ft 2 [0.46 kg/m2] .The weight of coating expressed in ounces per square foot or kilograms per square metre shall be calculated by dividing the total weight of zinc, inside plus outside, by total area, inside plus outside, of the surface coated.
  • The ASTM A795 standard specifies a minimum coating thickness of 1.3 oz/ft2 (0.40 kg/m2).
  • ASTM A795 requires that Test specimens for the determination of weight of coating shall be cut approximately 4 in. [100 mm] in length.
  • ASTM A795 requires that If flattening tests are made on galvanized samples, any flaking or cracking of the galvanized coating shall not because for rejection.
  • Protective Coating-If required by the purchaser, the pipe shall be cleaned of all foreign matter, dried, and given a protective coating such as oil, lacquer, enamel, etc., as agreed upon by the purchaser.

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Product Marking Of ASTM A795 Fire Protection Pipe

 

  • Each length of pipe shall be legibly marked by rolling,stamping, or stenciling to show the name or brand of the manufacturer, the kind of pipe, that is, continuous-welded, electric-resistance-welded A, electric-resistance-welded B,seamless A, or seamless B. Grade A or B for Type E or S pipe,the ASTM designation, the length, and the letters "NH" if not hydrostatically tested. Bundled pipe NPS 1 1 ⁄2 [DN 40] and smaller may have this information marked on a tag, securely attached to each bundle.
  • When pipe sections are cut into shorter lengths by a subsequent processor for resale as material, the processor shall transfer complete identifying information to each unmarked cut length, or to metal tags securely attached to bundles of unmarked small diameter pipe. The same material designation shall be included with the information transferred and the processor's name, trademark, or brand shall be added.
  • Bar Coding-In addition to the above requirements, bar coding is acceptable as a supplemental identification method. The purchaser may specify in the order a specific bar coding system to be used.

 

Correlation between STM A795 and UL and FM

 

The correlation between ASTM A795 fire-resistant pipes, UL (Underwriters Laboratories), and FM (FM Approvals) lies in their complementary roles in ensuring the safety, reliability, and compliance of fire protection piping systems. 

 

 

  • ASTM A795: A material standard developed by ASTM International (American Society for Testing and Materials) that specifies technical requirements for carbon steel pipes used in fire protection systems (e.g., chemical composition, mechanical properties, manufacturing processes, and testing methods). It defines the "basic quality" of the pipe itself.
  • UL: A global safety certification organization that develops safety standards and conducts product certification to verify that products meet fire, electrical, or structural safety requirements.
  • FM: A certification organization focused on property loss prevention (especially in fire and industrial safety). It develops standards for fire protection products and systems to ensure they perform reliably in fire emergencies.

Fire protection systems (e.g., sprinkler systems, standpipes) are critical for life and property safety. A pipe that meets only ASTM A795 (material standards) may still fail in actual use .UL and FM certifications fill this gap: They verify that the pipe, as a key component, can maintain performance in the entire lifecycle of the fire protection system (from installation to fire emergencies).
Since UL and FM standards explicitly reference ASTM A795 as the material benchmark, manufacturers must first produce pipes that meet ASTM A795, then pass UL/FM's additional tests to enter the market.

A795 Fire Protection Pipes

  •  youfa certificate Of ASTM A795 Fire Protection Pipe

Ul Certificates For Fire Sprinkler Pipe 1-1
Ul Certificates For Fire Sprinkler Pipe 1-1
Ul Certificates For Fire Sprinkler Pipe 1-2
Ul Certificates For Fire Sprinkler Pipe 1-2

Contact us for more information regarding ASTM A 795 steel tubing specifications and product options, or request a quote for further pricing details today.
Youfa steel pipe is your trusted source for premium ASTM A795 carbon steel tubing products.

 

 

 

 

 

 

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