Buttweld Fittings
A steel
buttweld fitting is defined as a part,
used in piping system to change the direction or function, which is
mechanically joined to the system.
Probably the simplest way to achieve this end would be to bend the pipe in
the direction required, but this process will stretch and thin the outer
wall whilst thickening and wrinkling the inner wall. This result in flow
resistance and accelerated wall erosion.
A second method sometimes used is a mitred joint, where pipes are cut to
the correct angle and welded together to achieve the desired change. Whilst
the cross-section area and wall thickness are maintained a great deal of
efficiency is lost due to friction and turbulence resulting from the severe
changes in direction; for example a single mitred bend offers about six
times the resistance of a swept elbow.
For these reasons swept fittings are preferred on most pipe systems,
particularly where internal pressure, flow and corrosion are major
consideration.
Types And Applications :
A piping systems using butt Welding fittings has many inherent advantages
over other forms.
- Welding a fitting to the pipe means that it is permanently leak
proof.
- The continuous metal structure formed between pipes and fitting adds
strength to the systems.
- Smooth inner surface and gradual directional changes reduce pressure
losses, turbulence and minimizes the action of corrosion and erosion.
- A welded system utilizes a minimum of space.
Buttweld Pipe Fittings
We offer
buttweld pipe fittings to our
clients with 45 deg elbow, 180 deg elbow fittings as per drawings, etc.
These buttweld pipe fittings and pipe fittings elbow are widely used in
dairy, breweries, mineral water, cosmetics, chemicals, distilleries, food,
soft drinks, pharmaceuticals, process control and allied industries. Tested
stringently for quality, these buttweld pipe fittings have the following
specifications :
- Sizes : 1. ¼" O.D. - 8" O.D. 2. ¼"
N.B. - 8" N.B.
- Standards : DIN / TRICLOVER / IDF / SMS / BSP / NPT
- Grade : 201, 202, 304, 304H, 304L, 309, 310, 316, 316L, 321,
etc.
- Material : Stainless steel: ASTM A403 WP304, 304L, 304H, 310,
316, 316L, 321, 321H, 347
Buttweld Elbow / Bends
The function of the
Buttweld Elbow / Bends
is to change direction of flow in a piping system
Butt Weld Elbows are split into 3 groups, which define the distance over
which they change direction, which is expressed as a function of the
distance from the centre line of one end to the opposite face. this is known
as the centre to face distance and is equivalent to the radius through which
the elbow is Bent..
- Long Radius Elbow : The most common is the long radius (L.R.)
elbow where the center to face dimension is always 1.5 times the nominal
pipe size of the elbow.
- Short Radius Elbow : In this case the centre dimension is the
same as the nominal pipe size of the elbow.
- Extra Long Radius : This is where the centre to face
dimension is longer than the standard long radius type. The most common
of these is where the centre to face dimension is three times, five
times, ten times the nominal size, i.e. 3D, 5D, 10D etc.
Technical Points :
Most of the people do not know where to measure the thickness of this
Elbows & Bends they check the thickness at the bevelled ends which is
not the correct way .......... Engineers working under Oil & Gas sector
and under third party inspection agency like EIL, DNV, BV etc have the
correct knowledge of measuring the wall thickness which is measured at the
back of the elbows/bends by ultrasonic thickness gauge instrument. The
People buying the quality products and less concerned about the prices will
definitely go with the measuring at the back of the elbow and others who are
very much price conscious will not understand this part.
Most Traders and other traders who represent themselves as manufacturer of
fittings & flanges will not know this .......... Secondly as per
ASME/ANSI B16.9 the Radius of an elbow from 15NB - 25NB is 38mm, But they
will supply 15NB Elbow Radius 19mm & 20NB Elbow Radius 29mm which is not
as per standard.
As on today we try to make our customer know about such thing and try to
convince them but if he is willing to accept less thickness at the back then
we take such types of orders.
Buttweld Eccentric & Concentric Reducers
The function of both types of
buttweld
eccentric & concentric reducers is to reduce the line from a larger
to a smaller pipe size, this obviously results in an increased flow to the
larger end enabling it to line up with one side of the inlet and not with
the other.
The concentric reducer is so manufactured that both inlet & outlet ends
are on a common centre line. The concentric type is easier and less
expensive to produce but does not allow quite the same versatility as the
eccentric reducer.
- Sizes : 1/2" NB to 48" NB
- Wall Thickness (SWG) : Sch 5, 10, 40, 80, 160, XXS (1.2mm –
25mm)
- Material : Stainless Steel, Carbon Steel, Alloy Steel,
Galvanized Steel, Mild Steel, Duplex, Copper Alloys, Nickel Alloys, etc.
Buttweld Pipe Caps Fittings
The function of an end
buttweld pipe caps
fittings are to block off the end of a line in a piping system. These
buttweld caps fittings are achieved by placing the end cap over the open
line and welding around the joint.
Buttweld Reducing Tees
The function of a
buttweld reducing tee is
to permit flow at 90 degree to the main direction of flow. The main flow
passes through the ‘run’ whilst the 90 degree outlet is known as
the ‘branch’. The equal tee is manufactured with all three outlets
being the same size. The buttweld reducing tees are manufactured with the
branch outlet smaller than the run to obtain the desired flow and pressure
through the system.
- Sizes : 1/2" NB to 48" NB
- Wall Thickness : Sch 5, 10, 40, 80, 160, XXS (1.2mm –
25mm)
- Material : Stainless Steel, Carbon Steel, Alloy Steel,
Galvanized Steel, Mild Steel, Duplex, Copper Alloys, Nickel Alloys, etc.
Lap Joint Stub Ends
Lap joint stub ends are associated slip on
flange in a piping system allows quick disconnection of the particular
section involved. Stub ends are installed in pairs and mated together with
two lap joint flanges. The surface of the lap joint stub end has a
phonographic serrated gasket surface which prevents leakage at the joint.
Using stub ends allows sections of the line to be opened for cleaning,
inspection or quick replacement etc, without the need to re-weld. There lap
joints stub ends are two basic types of stub end, A.S.A. long barrel, and
M.S.S. short barrel. Under certain design criteria such as temperature or
pressure etc., it is not acceptable to have the joint between stub end and
pipe in close proximity with the flange joint; in these applications A.S.A.
types are used.
Stainless Steel Buttweld Fittings
We offer a wide range of
stainless steel
buttweld fittings including bend, elbow, return bend, tee, reducer, stub
end, cross, cap, etc. Made as international standards, these interchangeable
butt weld fittings can be easily installed using simple hand tools.
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