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| What are the different types of
pipes and how are they classified? |
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| The manufacturing processes
decides the dominant characteristics of the
pipe. Therefore the classification of the pipes
is named after the method of its manufacturing.
The various classifications are :- |
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| ERW – Electric
Resistance Welded |
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| EFSW – Electric Fusion
Spiral Welded |
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| SAW – Submerged Arc
Welded |
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| SSAW- Spiral Seam Arc
Welded |
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| SEAMLESS HFS –pipes manufactured
by piercing & rolling the heated billet are
known as HFS pipe |
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| SEAMLESS CDS – hollows/or hfs
pipes are further drawn by cold drawing method. |
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| E.Fs.W – Electric Fusion Welded |
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| What are the
differences between Pipes and Tubes ? |
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| Pipes & tubes are basically
hollow bar,the diffrentiaition is mainly
depending on its end use,& its dimension
designation. |
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| - Tubes are usually thin walled
sections. Their wall thickness ranges from 0.3mm
to 12.7 mm. The wall thickness are specified in
Gauges as BWG/SWG. Pipes have range of wall
thickness from 2mm to 65mm. |
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| - Tubes are numerically
identical to the size of their ODs. The wall
thickness specified in Gauges as BWG/SWG. For
example, a ¾ inch tube has OD, which is equal to |
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| ¾ x 25.4 = 19.05mm which is
equivalent to the size of its designation. |
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| - Where as Pipe dimensions have
Outer Diameter that is numerically larger than
the designated size. For example, a 4-inch NB,
the OD is not equal to |
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| 4 x 25.4 = 101.6mm BUT its
equal to 4.5x25.4=114.3mm |
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| - Tubes can also be easily
coiled but the thickness and rigidity of the
pipes makes them harder to bend. |
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| - Tubes can be used to connect
parts of machines such as Heat exchangers,
condensers and as a result are subjected to both
internal and external pressures. Pipes are
generally used to connect large machines to
other large machines and are generally not
subjected to external pressures. |
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| What are the
various standard test conducted on a seamless
pipes after manufacture? |
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| Pipes undergo rigorous testing
to ensure that they are of the highest quality.
They are done specifically to meet certain
requirements. The mandatory tests are grouped
as:- |
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| Non – Destructive |
- HYDRO TESTING
- (UT) ULTRASONIC TEST
- (ECT) EDDY CURRENT TEST
- MPI (MAGNETIC PARTICLE INSPECTION
- PMI (POSITIVE MATERIAL IDENTIFICATION
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| Destructive |
- MECHANICAL TESTING FOR TENSILE STRENGTH
- MECHANICAL TESTING FOR IMPACT
- MECHANICAL TEST FOR FLATTENING
- MECHANICAL TEST FOR FLARING
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| Explain what is the
significance of each of the following test and
what can be known from them. |
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| Hydro test – This is
performed to check the leakge as a result of
manufacturing defects |
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| Eddy Current Test – This
is done to ensure there are no surface defects
on the inner / outer surface areas |
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| Magnetic Particle Test –
to detect surface and sub surface discontinuity,
surface cracks and minor ruptures |
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| Ultra Sonic Testing –
This is performed to detect flaws such as laps,
laminations, blowholes and cracks |
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| Positive Material
Identification – To verify the chemical
constituents of the pipes and check for
percentage of alloying elements such as Chrome,
Molybdenum, Nickel, Manganese, etc. without
destroying the pipe so as
to not mix up different grades of pipes like
P11, P5, P22, P9, SS316, SS304, SS321 etc. |
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| What is the relevance of the
colour coding system at ESP? |
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All pipe look the
same. A major method of identification for its
different grade and quality is the stenciling on
the pipe. During storage and handling there are
chances of this stenciling getting erased. This
leads to mix up of the grades of the pipe. Hence
a distinctive color coding system prevents such
grade mix up that could lead to a wrong
delivery. Color coding being more visually
distinctive can easily be identified by all,
hence ensures correct delivery to the customer. |
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| What does the seven year
traceability module ensure? |
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Defective pipes
that have been rejected by the manufacturer
enter the trade market when unscrupulous traders
buy the pipes as scrap and sell them as a
genuine product hence making huge profits. |
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| Evergreen has formulated a
unique, customized method of traceability to
ensure that our customers get only absolutely
genuine material. We maintain a complete record
of all documents that prove both the
authenticity of a particular pipe and the link
to its manufacturer, since poor quality of pipes
can be disastrous and can cripple operations.
Evergreen’s quality control plays a vital role
in preventing this. |
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| In case of an unforeseen
adversity we can quickly and efficiently
retrieve information of the specific pipe, and
trace its origin to its corresponding
manufacturer and the supplies made for that
particular lot. |
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| Hence this unique method of
traceability has been built to ensure that the
customers have complete information of the
transaction,even after elongated lapse in time. |
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| How is the integrated ERP
system beneficial to the customer? |
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Evergreen’s
integrated ERP system will enable the customer
to be continuously aware of the position of
their consignment. Thereby reducing any gap in
communication and improving transparency. |
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| What methods have you taken to
ensure the effective stocking of pipes? |
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Evergreen has been the first to
build a state-of-the-art warehousing facility
with modernized racking system.
The warehouse has a total area of 80,000 sq. ft.
of which 25,000 sq. ft is enclosed space
dedicated to stocking the pipes. With a
constantly monitored, clean and dry atmosphere,
we ensure a safe warehouse for the effective
storing of pipes. |
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