ASTM A795

ASTM A795

ASTM A795 is a standard for steel pipe used in fire sprinkler systems. It is available in two finishes: black lacquer and hot-dipped zinc. The nominal pipe size system is used to specify sizes.

This specification applies to welded and seamless black and hot-dipped galvanized steel pipe in sizes NPS 1/2 to NPS 10, inclusive, with wall thicknesses as specified in Tables 1 and 2. Pipe with different wall thicknesses may be supplied as long as it meets all other requirements of this specification and has the outside diameter listed in Table 2. This specification specifies pipe for use in fire protection systems. The pipe may be bent; however, it is not meant for bending at room temperature with an interior diameter less than twelve times the exterior diameter of the pipe being bent.

Sprinkler pipe is sometimes known as fire steel pipe or fire steel pipeline; however, it is most commonly used to refer to sprinkler steel pipe. It refers to the materials used in pipelines for fire suppression, connecting fire equipment, and transferring water, gas, or other media. Due to particular needs, the thickness and material of sprinkler pipe, as well as red paint sprayed or epoxy coating to transport firewater, have special requirements.

PRODUCT FEATURES

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 Designator

Outside Diameter

Nominal Wall Thickness

Weight Plain End

Test Pressure

Furnace-Welded

Seamless and Electric-Resistance-Welded

 

in.

mm

in.

mm

lb/ft

kg/m

psi

MPa

psi

MPa

3/4

1.050

(26.7)

0.083

(2.11)

0.860

(1.280)

500

(3.45)

700

(4.83)

1

1.315

(33.4)

0.109

(2.77)

1.410

(2.090)

500

(3.45)

700

(4.83)

1.25

1.66

(42.2)

0.109

(2.77)

1.810

(2.690)

500

(3.45)

1000

(6.89)

1 1/2

1.90

(48.3)

0.109

(2.77)

2.090

(3.110)

500

(3.45)

1000

(6.89)

2

2.38

(60.3)

0.109

(2.77)

2.640

(3.930)

500

(3.45)

1000

(6.89)

2 1/2

2.88

(73.0)

0.120

(3.05)

3.530

(5.260)

500

(3.45)

1000

(6.89)

3

3.50

(88.9)

0.120

(3.05)

4.340

(6.460)

500

(3.45)

1000

(6.89)

3 1/2

4.00

(101.6)

0.120

(3.05)

4.980

(7.410)

500

(3.45)

1200

(8.27)

4

4.50

(114.3)

0.120

(3.05)

5.620

(8.370)

500

(3.45)

1200

(8.27)

5

5.56

(141.3)

0.134

(3.40)

7.780

(11.580)

B

B

1200

(8.27)

6

6.63

(168.3)

0.134

(3.40)

9.300

(13.850)

B

B

1000

(5.51)

8

8.63

(219.1)

0.188C

(4.78)

16.960

(25.260)

B

B

800

(4.83)

10

10.75

(273.1)

0.188C

(4.78)

21.230

(31.620)

B

B

700

(6.89)

 

ASchedule 10 corresponds to Schedule 10S as listed in ANSI B 36.19 for NPS 3⁄4 through 6 only.

BFurnace-welded pipe is not made in sizes larger than NPS 4.

CNot 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

Furnace-Welded

Seamless and Electric-Resistance-Welded

 
 

in.

mm

in.

mm

lb/ft

kg/m

psi

MPa

psi

MPa

 

1/2

0.84

(21.3)

0.109

(2.77)

0.850

(1.270)

700

(4.83)

700

(4.83)

 

3/4

1.05

(26.7)

0.113

(2.87)

1.130

(1.690)

700

(4.83)

700

(4.83)

 

1

1.32

(33.4)

0.133

(3.38)

0.680

(2.500)

700

(4.83)

700

(4.83)

 

1  1/4

1.66

(42.2)

0.140

(3.56)

2.270

(3.390)

1000

(6.89)

1000

(6.89)

 

1 1/2

1.90

(48.3)

0.145

(3.68)

2.720

(4.050)

1000

(6.89)

1000

(6.89)

 

2

2.38

(60.3)

0.154

(3.91)

3.660

(5.450)

1000

(6.89)

1000

(6.89)

 

2 1/2

2.88

(73.0)

0.203

(5.16)

5.800

(8.640)

1000

(6.89)

1000

(6.89)

 

3

3.50

(88.9)

0.216

(5.49)

7.580

(11.290)

1000

(6.89)

1000

(6.89)

 

3 1/2

4.00

(101.6)

0.226

(5.74)

9.120

(13.580)

1200

(8.27)

1200

(8.27)

 

4

4.50

(114.3)

0.237

(6.02)

10.800

(16.090)

1200

(8.27)

1200

(8.27)

 

5

5.56

(141.3)

0.258

(6.55)

14.630

(21.790)

C

C

1200

(8.27)

 

6

6.63

(168.3)

0.280

(7.11)

18.990

(28.290)

C

C

1200

(8.27)

 

8

8.63

(219.1)

0.277A

(7.04)

24.720

(36.820)

C

C

1200

(8.27)

 

10

10.75

(273.1)

0.307A

(7.80)

34.270

(51.050)

C

C

1000

(6.89)

 
 

ANPS 1⁄2 through 6—Schedule 40; NPS 8 and 10—Schedule 30.

BBased on 20-ft (6.1-m) lengths.

CFurnace-welded pipe is  not made in sizes larger than NPS 4.

Chemical Composition of ASTM A795 Pipe

  1. The ASTM A795 material must meet the chemical composition requirements specified in Table 3.
  2. The purchaser 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 Table 3.
  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 Table 3, 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 Table 3.

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

0.30

1.20

0.035

0.035

Coating of ASTM A795 Pipes

  1. Hot-dip galvanized pipe must be zinc-coated on both the inside and outside. The zinc used for the coating must be of any grade that meets Specification B 6.
  2. Coating Weight: The weight of the zinc coating shall not be less than 1.5 oz/ft2 (0.46 kg/m2) as determined by the average of two specimens tested in accordance with 16.1 and shall not be less than 1.3 oz/ft2 (0.40 kg/m2) for either of the specimens. The coating weight, expressed in ounces per square foot or kilograms per square meter, is calculated by dividing the total weight of zinc, inside and out, by the total area of the surface coated, inside and out.
    • Test specimens for determining coating weight must be approximately 4 in. (102 mm) in length.
    • A stripping test in accordance with Test Method A 90 is used to determine the weight of zinc coating. Each specimen’s total zinc content must be determined in a single stripping operation.
    • Any flaking or cracking of the galvanized coating shall not be cause for rejection if flattening tests are performed on galvanized samples.
  1. Protective Coating—If the purchaser requests it, the pipe must be cleaned of all foreign matter, dried, and coated with a protective coating such as oil, lacquer, enamel, or other material agreed upon by the purchaser.

Lengths of ASTM A795 Pipes

Unless otherwise specified, the pipe shall be delivered in single random lengths ranging from 16 to 22 feet (4.9 to 6.7 m).

Weights of ASTM A795 Pipes

  1. Tables 1 and 2 show the weights and corresponding wall thicknesses for pipes of various outside diameters.
  2. Nipples shall be cut from a pipe of the same quality and weight as described in 1.

Dimensions, Weight, and Permissible Variations of ASTM A795 Pipes

  1. Weight—The weight of the pipe covered by Tables 1 and 2 shall not deviate from the prescribed weight by more than 65 percent. The weight of pipe with other wall thicknesses shall not deviate from the nominal weight calculated from the relevant equations in Section 5 of ASME B36.10M by more than 65 percent.

NOTE 6—The weight tolerance of 65 percent is calculated by dividing the weights of standard lifts of pipe produced for shipment by the mill by the number of feet in the lift. Individual lengths can be weighed on pipe sizes larger than NPS 4, and the weight tolerance applies to the individual length.

  1. Diameter—For pipe NPS 112 and below, the outside diameter at any point shall not vary more than 164 in. (0.4 mm) above or less than 132 in. (0.8 mm) below the standard specified. The outside diameter of pipe NPS 2 and above shall not deviate more than 61 percent from the standard specified.
  2. Thickness—At any point, the minimum wall thickness shall not deviate more than 12.5 percent from the nominal wall thickness.

Workmanship, Finish, and Appearance of ASTM A795 Pipes

  1. The finished pipe must be reasonably straight and defect-free. Any imperfection with a depth greater than 12.5 percent of the specified wall thickness, as measured from the pipe’s surface, is considered a defect. All burrs at pipe ends must be removed.
  2. End Finish—The pipe shall conform to the following practice:
  • Unless otherwise specified, each end of the pipe shall be furnished plain end.
  • When threads are specified, all threads must be manufactured in accordance with ASME B1.20.1 gaging practice and tolerances.
  • When couplings are specified, they must be manufactured in accordance with Specification A 865.

Product Marking of ASTM A795 Pipes

  1. Each length of pipe shall be legibly marked by rolling, stamping, or stenciling with the manufacturer’s name or brand, the type of pipe, that is, continuous-welded, electric-resistance-welded A, electric-resistance-welded B, seamless A, or seamless B. The ASTM designation, the length, and the letters “NH” if not hydrostatically tested for Type E or S pipe. This information may be marked on a tag securely attached to each bundle of bundled pipe NPS 112 and smaller.
  2. 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 to 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.
  3. Barcoding is acceptable as a supplemental identification method in addition to the requirements in 1 and 2. The purchaser may specify a specific bar-coding system to be used in the order.

Packaging, Package Marking, and Loading of ASTM A795 Pipes

  1. When specified in the purchase order, shipment packaging, marking, and loading shall be in accordance with Practices A 700.
  2. For Government Procurement—Unless otherwise specified in the contract or purchase order, the material must be preserved, packaged, and packed in accordance with MIL-STD-163. The levels that apply must be specified in the contract or order. Marking for shipment of such material shall be in accordance with Fed. Std. No. 123 and, for military agencies, MIL-STD-129.
show various kind of galvanized pipes
Galvanized Pipe
Pipe Coating
Pressure Pipe
pipe-fittings
Pipe Fitting
Scroll to Top

Get A Quote Now

Fill in the form below and our team will be happy to assist you