There are some basic differences in the dimension, manufacturing, and uses of ERW/GP/GI/MS Pipes & Tubes, such as
ERW PIPES AND TUBES
ERW stands for “electric
resistance welded”. ERW pipes and tubes are manufactured by rolling metal and
then welding it longitudinally across its length. ERW pipes have a welded joint
in its cross-section. It is manufactured from Strip/Coil and can be
manufactured up to 24” OD. High-frequency Induction Welding Technology is used
for ERW Pipes &Tubes up to 21-inches OD. ERW pipe cold formed from a ribbon
of steel pulled through a series of rollers and formed into a tube which is
fused through an electric charge. It is mainly used for low/ medium pressure
applications such as transportation of water /oil. Spar Steel is
one of the leading ERW Stainless Steel Pipes and tubes manufacturers and
exporter to the Middle East and other MENA countries.
Common sizes for ERW Steel Pipe and tubes
are made in a variety of lengths to over 100 feet. Surface finishes are available
in bare and coated formats and processing can be handled on-site to customer
is the leading and reliable scaffolding company for the supply of quality
products in different range and dimensions of ERW/GI/GP Pipes and tubes in the Gulf, Dubai, UAE, and other
MENA countries. Spar Steelis
known and trusted for manufacturing with the latest advanced technology a wide
range of steel pipes and tubes like MS/ERW Pipes/Black Pipes /GP/GI Pipes/GIS
Tubes/Galvanised Pipes/Galvanised Tubes /ARAMCO Pipes & Tubes,
etc. based on international parameters.
GI/GP/MS PIPES AND TUBES
GI Pipesand Tubes
GI stands for “galvanized iron.” Thus, GI pipes are
galvanized iron pipes or called coated iron pipes in old terminology. GI carbon
steel pipes are immersed in a galvanic (zinc) bath. GI (Galvanized
Iron) Pipes are classified into 3 grades based on their weight
per meter and inner diameter thickness. The more the thickness, the better the
performance and durability. According to the IS 1239, each pipe shall
bear a color strip across the circumference for identifying the “class” of
the GI pipes. These pipes are
cheaper, of lightweight and easy to handle.
GP Pipesand Tubes
GP stands for “galvanized pipe.” GP Pipes are made of thin
sheets of carbon steel electroplated with zinc and then rolled into
pipes. GP pipes are superior to GI pipes in
terms of finish. Galvanized pipes are dipped in a protective zinc coating to prevent
corrosion and rust. This piping was commonly installed in homes built
before 1960. When the galvanized pipe was invented, it became an
alternative to leadpipe for water supply lines.
pipe and tube, covered
with zinc, increases the pipes and tubes life expectancy and make it
more resistant to corrosion and mineral deposits in the line. It is a plumbing
material that is used in water supply lines and has
been used in homes for years.
MS Pipesand Tubes
MS stands for “Mild Steel.” And so, MS Pipes are
made from mild steel they can easily be welded and formed in
various shapes and sizes for pipelining and tubing purposes.
These are generally used for drinking water supply i.e. Plumbing, Firefighting,
HVAC but can also be used in various other Industrial and Engineering
steel pipe refers to the content of less than 0.25% carbon steel
because of its low strength, low hardness, and soft. MS pipes or tubes
contain a small amount of carbon (0.18% or less) steel.
Mild Steel Pipe
and MS Tubes conforming
to IS:1239 Part I (1/2” to 6” NB – A-Class, B Class OR C Class)
large-diameter Mild Steel Pipes confirming to IS:3589 Grade FE 330 or
GR FE 410 (up to 20″, 508mm as per required wall thickness.)
MS Steel Black Pipesand Tubes
Mild SteelBlack Pipes is called MS Black Pipe because
it is not galvanized and is an ideal product to be welded into pipes,
tubes, and other kinds of tubing. It is one of the cheapest metals available in
the market and can last up to 100 years if placed in a well-maintained
Spar Steel produces
laser-welded pipes and tubes from 0.19 mm to 152.4 mm diameter, and various
other sizes of Round Tubes, Square Tubes, Rectangular Tubes that can be used
for any application requiring the greatest performance, durability, strength,
PIPE AND TUBE MANUFACTURING PROCESS
Steel pipes are long and hollow tubes that
are used to convey products like liquid, gas, etc. from one place to another.
They are produced mainly by two distinct manufacturing methods which result in
either a welded pipe or a seamless pipe. In both the
manufacturing methods, raw iron or steel is the first cast into a more workable
starting form (i.e. hot billet or flat
strip). It is then made into a pipe by stretching the hot steel billet
out into a seamless pipe or forcing the edges of flat steel strip together and
sealing them with a weld. In this heading, we will discuss the various methods
involved in welded pipe manufacturing along with its history.
In the beginning, pipe and
tube were manufactured by hand – by heating, bending, lapping, and hammering
the edges together. The historical evidence pointed out the first automated
pipe manufacturing process was introduced in 1812 in Britain (England).
And manufacturing processes of Pipes and tubes
have continually improved since 1812 with the invention of scientific methods,
materials, and technology. Some of them for pipe manufacturing techniques are
Lap Welding Pipe and Tube Manufacturing Process
Lap welding was introduced in the early 1920s for the manufacturing of pipes
and tubes. But now this technique is no longer in use. However, some pipes that
were manufactured using the lap welding process is still in use today.
In the process of lap welding
manufacturing, steel was heated in a furnace and then rolled into the shape of
a cylinder. The edges of the steel plate were then “scarfed”. During the scarfing
process overlaying the inner edge of the steel plate, and the tapered edge of
the opposite side of the plate was involved. The seam was then welded using a
welding ball, and the heated pipe was passed between rollers which forced the
seam together to create a bond.
The welds made by lap welding
are not as reliable as those made by modern methods later on. The American
Society of Mechanical Engineers (ASME) has developed an equation for
calculating the allowable operating pressure of the pipe, based on the type of
manufacturing process. This equation has a variable known as a “joint factor”,
which is based on the type of weld used to create the seam (edge) of the pipe. Seamless pipes have a joint factor of 1.0. Lap
welded pipe has a joint factor of .6.
ERWPipe and Tube Manufacturing Process
In the Electric resistance
welded (ERW) manufacturing process, the pipe is manufactured by
cold-forming a flat sheet of steel into a cylindrical shape. Then the current
is passed between the two edges of the steel to heat the steel to a point at
which the edges are forced together to form a bond without the use of welding
There are several Electric Resistance
Welding (ERW) processes available for pipe production. The two main types
of ERW manufacturing process are:
Contact Wheel Welding Process
1. High-Frequency Welding Process
In the beginning, this manufacturing
process used low-frequency A.C. current to heat the edges. This low-frequency
process was used from the 1920s until 1970. In 1970, the low-frequency process
was superseded by a high-frequency ERW process which produced a higher quality
weld. As time passed, the welds of low-frequency ERW pipe was found to be
susceptible to selective seam corrosion, hook cracks, and inadequate bonding of
the seams, so low-frequency ERW is no longer used to manufacture pipe. The high-frequency
ERW process is still being used in pipe manufacturing.
There are two types of High-Frequency ERW
manufacturing processes, such as
In the process of “high-frequency induction welding (HFIW)”, the weld
current is transmitted to the material through a work coil in front of the weld
point. The work coil does not contact the pipe. The electrical current is
induced into the pipe material through magnetic fields that surround the
pipe. High-frequency induction welding eliminates contact marks and reduces
the setup required when changing pipe size.
High-Frequency Contact Welding
In the process of “high-frequency contact welding (HFCW)”, the weld
current is transmitted to the material through contacts that ride on the strip.
The welding power is applied directly to the pipe, which makes this process
more electrically efficient than high-frequency induction welding. Because it
is more efficient, it is well-suited to the large diameter and high wall
thickness pipe production.
2. Rotary Contact Wheel Welding Process
In the pipes manufacturing process of “Rotary
Contact Wheel Welding (RCWW)”, the electrical current is transmitted
through a contact wheel at the weld point. The contact wheel also
applies some of the forge pressure necessary for the welding process. The
three main types of rotary contact wheel welders are AC, DC, and square
wave. In all these three power supplies, electrical current is transferred
by brush assemblies that engage slip rings attached to a rotating shaft that
supports the contact wheels. These contact wheels transfer the current to the
Rotary Contact Wheel Welding
The rotary contact welding is
useful for applications that cannot accommodate an impeder inside
the pipe or tube. For example, a small-diameter refrigeration grade tube
and tube that is painted on the ID immediately after the welding
USE & APPLICATION OF STEEL PIPES/TUBES
Steel pipes and tubes are multidimensional
manufactured for multifarious purposes. This is the reason why they are
commonly used in many industries, from gas to sewage i.e. domestic, medical,
factories, construction, etc. They also come in a variety of types and sizes, and
they can easily be customized to fit the needs of a particular project, adding
even more to its versatility. For this reason, it is near impossible to find an
industry that does not use steel pipes and tubes in one way or the other.
Construction industries, in particular,
has benefited the most as steel is a more practical alternative to other
metals, like iron. Steel is corrosion resistant, making them more durable and
The construction companies preferred steel
pipes and tubes because of other unique properties as they are malleable and
sturdy, at the same time. Steel pipes are also used as construction piling, to
support the weight of heavy buildings when the soil is too weak. It is also
used on the building itself and even its architectural design.
Steel pipes and tubes are also used to
construct ships, the shipyard where they are kept, oil refineries, and even
space stations. Whether the construction is on land, over the water, or in
space, steel pipes and tubes are a quality choice.
Spar SteelScaffolding Round Tubes are supplied in HR (Black), Galvanized (Hot-Dip) or
Pre-galvanized types can be used in the structural and fencing application,
Produced from ½’ to 6″ inch different thickness.
Spar SteelScaffolding Square Tubes are
supplied only in HR (Black) & Pre-Galvanized type. Can be used in
structural, Furniture and other commercial application. Produced with various
other sizes and thicknesses, from 16mm x 16mm to 120mm x 120mm
Spar SteelScaffolding Square Tubes are
supplied only in HR (Black) & Pre-Galvanized type. Can be used in
structural, Furniture and other commercial application Produced with different
sizes and thicknesses from 20mm x 15mm to 100mm x 60mm
Spar Steel possesses
steel pipes and tubes products and manufacturing facilities that are capable of
responding to diverse customer requirements. The company is also energetically
engaged in different latest technical development efforts to match the most
advanced pipes and tubes manufacturing process.
Locations for Spar Group Scaffolding Products & Services
For Spar Steelquality
scaffolding products and services based on OSHA, Saudi
Aramco, and Adnoc,
Enoc, UAE safety
standard and rules, clients can contact on the following addresses given below:
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