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API 5L Line Pipe
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ASTM A335
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Welded and seamless steel line pipe commonly used to
convey gas, water and oil in the petroleum and natural
gas industries.
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This specification covers nominal (average) wall seamless
steel pipe intended for high temperature service. Twelve
grades are listed in ASTM A335.
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API 5LX High Test Line Pipe
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ASTM A333
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Covers welded and seamless steel line pipe having
greater tensile and bursting strengths than for pipe
manufactured under Specification 5L.
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This specification covers nominal (average) wall seamless
and welded carbon and alloy steel pipe intended for
use at low temperatures. There are seven grades listed in
ASTM A333.
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ASTM A106
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ASTM A312
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Black seamless (welded not permitted) fully killed carbon
steel pipe for high temperature, high pressure service in
three grades of seamless pipe of varying tensile strength.
Although the physical and chemical properties for grades
A and B are comparable to those for A53 pipe, and
the types of testing required by both specifications are
similar, the test prescribed for A106 are more stringent
and are applied to smaller lots of pipe. Therefore, A106
is preferred for exacting services.
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Seamless and welded austenitic stainless steel pipe for
high and low temperature service.
Austenitic stainless steels are usually accepted for service
temperatures as low as – 198 celcius degrees, without
impact testing.
Grades TP 304, 304L and 347 are suitable for
temperatures as low as – 254 celcius degrees – refer
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ASTM A53
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This pipe can be obtained either black or galvanised, in
seamless and welded grades A & B.
Tensile strength, yield-point elongation requirements of A53 steel pipe are generally similar to the API 5L
specification. It is often difficult to procure A53 heavier
than extra strong, and A106 pipe is generally stipulated
for the heavier wall thicknesses.
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Methods Of Manufacture Seamless Pipe
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Methods Of Manufactur Electric Resistance Welded Pipe (ERW)
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Specifications:
API 5L & 5LX
ASTM A120
ASTM A53
ASTM A333
ASTM A106
ASTM A335
Size :
Up to 762mm OD (30”)
In the seamless pipe-making process tube rounds are
heated in a furnace, after which they are pierced, than
rolled by the mandrel or Plug – Mill process into pipes
and tubes of specified diameters and wall thicknesses.
Seamless tubular products are generally hot – rolled, but
can be also supplied cold – drawn (up to 273mm O.D.
(10”) when required).
The Push – bench process can also be used in the
manufacture of seamless pipe. In this process, a steel
billet is furnace heated to the plastic state and partly
punched at one end to take a mandrel. The billet is then
forced by the mandrel through a series of gradually
reducing dies, until the required outside diameter has
been attained, the I.D. being determined by the size of
the mandrel.
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Specifications:
API 5L & 5LX
ASTM A252
ASTM A53
ASTM A333
ASTM A120
ASTM A500
ASTM A135
Size :
Up to 610mm OD (24”)
In the seamless pipe-making process tube rounds are
heated in a furnace, after which they are pierced, than
rolled by the mandrel or Plug – Mill process into pipes
and tubes of specified diameters and wall thicknesses.
Seamless tubular products are generally hot – rolled, but
can be also supplied cold – drawn (up to 273mm O.D.
(10”) when required).
The Push – bench process can also be used in the
manufacture of seamless pipe. In this process, a steel
billet is furnace heated to the plastic state and partly
punched at one end to take a mandrel. The billet is then
forced by the mandrel through a series of gradually
reducing
dies, until the required outside diameter has
been attained, the I.D. being determ
ined by the size of the
mandrel.
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Methods Of Manufacture Seamless Pipe
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Specifications:
API 5L
5LX & 5LU
ASTM A53
Size :
Up to 1820mm OD (72”)
Steel plates are first U – shaped then O – formed by
a hydraulic press. The seam is welded from inside and
outside automatically by the submerged – arc process.
Hydraulic expansion gives the pipe precise diameter
and roundness and relieves residual stresses caused by
forming and welding. |
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