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Pipe Specification A795
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Specification |
A795 NPS 1/2 -- 10" Schedule 10 and Schedule 40 |
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Scope |
Covers seamless and
welded, black and hot-dipped galvanized nominal
wall pipe. For coiling, bending, flanging and is
suitable for welding. Pipe ordered for this
specification is intended for use in free
protection system.
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Kinds of Steel
Permitted For
For Pipe Material |
Open-hearth
Electric-furnace
Basic-oxygen |
Hot-Dipped
Galvanizing |
Sets
standards for coating of pipe with zinc inside
and outside by the hot-dipped process. Weight of
coating must not average less than 1.8 oz per
square foot and not less than 1.6 per square ft. |
Permissible Variations
in Wall Thickness |
The
minimum wall thickness at any point shall not
vary by more than 12.5% under the nominal wall
thickness. |
Chemical
Requirements |
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Grade A |
Grade B |
Furnace-Weld Pipe Type F |
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Carbon max.
% |
0.25 |
0.30 |
- |
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Manganese % |
0.95 |
1.20 |
- |
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Phosporous,
max. % |
0.05 |
0.05 |
0.08 |
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Sulfur,
max. % |
0.06 |
0.06 |
0.08 |
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Tensile
Requirements |
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Seamless
or ERW |
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Grade A
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Grade B |
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Tensile Strength, min., psi |
48,000
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60,000 |
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Yield Strength, min., psi |
30,000 |
35,000 |
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NDE and
Hydrostatic
Testing |
Hydrostatic inspection test pressures for plain
end and threaded are specified. Hydrostatic
pressure shall be maintained for not less than 5
seconds for all sizes of seamless and electric
resistance weld pipe. Non destructive electric
test in accordance with practices E 213 or E 309
for the larger sizes. Pressure is maintained for
not less than 5 seconds. |
Permissible Variations
in Weights per Foot |
Plus
or minus 5% |
Permissible
Variations in
Outside Diameter |
Outside diameter at any point shall not vary
from standard specified more than-
For NPS 1 1/2 and Smaller Sizes: 1/64" over
1/32" under
For NPS 2 and Larger Sizes: 1% over 1% under
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Mechanical Tests
Specified |
Flattening - Tests are to be performed on
electric-resistance welded pipe, and furnace
welded pipe. |
Number of
Tests Required |
Flattening and tensile on one length of pipe
from each lot of 400 lengths or less of a style. |
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Lengths |
Unless specified, pipe shall be furnished on
single random lengths or 16 to 22 ft. |
Required Markings
on Each Length
(On Tags attached to
each Bundle in case
of Bundled Pipe) |
Rolled Stamped or Stenciled (Mfrs. option)
Name or brand of the manufacturer
Electric-resistance welded A
Eectric-resistance welded B
Seamless A / Seamless B,
Grade A or B for type E or S pipe
Wall thickness schedule ASTM A795
The letters NH if not hydrostatically tested
The length of pipe |
General
Information |
End
finish may be plain end beveled or plain end
square cut. |
