|
Specification
A53 |
NPS 1/8 -- 26
STD. XS and XXS, ANSI Schedules 10 through 160 |
| Scope |
Covers Seamless
and Welded, Black and hot-dipped galvanized nominal (average) wall
pipe for coiling, bending, flanging and other special purposes and
is suitable for welding. Continuous-Welded pipe is not intended for
flanging. Purpose for which pipe is intended should be stated on
order. |
| Kinds of Steel
Permitted For Pipe Material
|
Open-hearth
Basic-oxygen
Electric-furnace
|
| 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 oz. Per square foot.
|
| Permissible
Variations in Wall Thickness
|
The minimum wall
thickness at any point shall not be more than 12.5% under the
nominal wall thickness specified. |
| Chemical Requirements
|
| |
C max % |
Mn max % |
P max
% |
S max % |
| Seamless or ERW
Grade A |
0.25 |
0.95
|
0.05
|
0.06 |
| Seamless or ERW
Grade B |
0.30
|
1.20
|
0.05
|
0.06 |
| Continuous-weld
|
- |
- |
0.08
|
0.06
|
|
| Tensile
Requirements |
|
|
Seamless and Electric Resistance Welded |
|
|
Continuous-Welded |
Grade A |
Grade B
|
|
Tensile
Strength, min., psi |
45,000
|
48,000
|
60,000
|
|
Yield
Strength, min., psi |
25,000
|
30,000 |
35,000 |
|
|
Hydrostatic Testing |
Hydrostatic
inspection test pressures for plain end and threaded and coupled
pipe are specified. Hydrostatic pressure shall be maintained for not
less than 5 seconds for all sizes of seamless and electric
resistance-weld pipe. |
|
Permissible
Variations in Weights per
Foot |
Plus or Minus 10%
|
|
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 " 1/32" under |
For NPS 2
and Larger Sizes
1% over 1%
under |
|
|
Mechanical Tests
Specified |
- Tensile Test --
Transverse required on ERW for NPS 8 and large.
- Sending Test
(Cold) -- STD and XS-NPS 2 and under XXS-NPS 1 1/4 and under.
- Degree of Bend
Diameter of Mandrel
- For Normal A53
Uses 90 12 x nom. dia. of pipe
- For Close Coiling
180 8 x nom. dia. of pipe
- Flattening Test --
NPS 2 and larger STD and XS. (Not required for XXS pipe). |
|
Number of Tests Required |
- Seamless and
Electric-Resistance-Welded
- Bending, flattening, tensile on one
length of pipe from each lot of 500 lengths or less of a size.
- Continuous-Weld --
Bending, flattening, tensile
-- NPS 1 1/2 &
smaller: one/25 tons
-- NPS 2 & larger: one/50
tons |
|
Lengths
|
Standard Weight
Single Random --
16' - 22'. 5% may be jointers. If Plain Ends -- 5 % may be 12' -
16'.
Double Random --
Shortest Length 22', minimum average for order 35'.
Extra Strong &
Double Extra Strong
Single Random --
12' - 22'. 5% may be 6' - 12'.
Double Random (XS
and lighter) -- Shortest Length 22', minimum average for order 35'.
Lengths longer
than single random with wall thicknessess heavier than XS subject to
negotiation. |
|
Required Markings
on Each Length
(On Tags attached
to each Bundle in
case of Bundled Pipe)
|
Rolled, Stamped or
Stenciled (Mfgrs. Option)
Name or brand of
manufacturer.
Kind of pipe, that
is, Continuous Welded, Electric-Resistance-Welded A,
Electric-Resistance-Welded B, Seamless A; or Seamless B; XS
for extra strong, XXS for double extra strong.
ASTM A53
Length of pipe.
|
|
General Information
|
Couplings --
Applied handling tight. Couplings, 2" and smaller straight tapped,
other sizes taper tapped.
Thread Protection
-- Applied to pipe 4" and large.
End Finish (unless
otherwise specified) --
STD or XS, or wall thicknesses less than 0.500 in.
(excluding XXS): Plain and beveled.
All XXS and wall
thicknesses over 0.500 in.: Plain end square cut. |
