can seamless Steel Pipes be replaced by
welded steel pipes? The answer: NO
There are some reasons
1) HAZ is very fragile
Although it is rare now that the mechanical properties of the weld seam exceed the base
metal itself, the weakest part of the welded steel pipe is not the weld seam, not the base
metal, but the heat-affected zone of the weld. This place is the most vulnerable.
2)The limited upper wall thickness of the welded steel pipe
Most thick-walled steel pipes can only be seamless steel pipes instead of
Welded Pipes
3)The H2S resistance of welded pipes is far worse than that of seamless pipes.
The requirements for seamless pipes on NACE MR0175 are: the S content must not exceed
0.010%. However, the requirements for Steel
Plates and welded pipes are particularly strict: S must not exceed 0.003%. Although
strict requirements are imposed on the steel plate, it can pass the HIC test, but the
welding seam has to pass the test, which is still a very difficult problem. Not only must
we choose the good welding material, but also the skilled welding process.
Oftentimes, using stainless steel components seems like a simple solution to corrosion
on Steel Coils. You may see fins or tubes
or other parts of the system show signs of corrosion, and it seems that the best option is
to change the coil to stainless steel, solving the corrosion problem permanently. While
this seems like a simple solution to a significant problem in the HVAC, industrial, and
commercial systems where coils are found, the answer to the question “should I make an
all-stainless coil?” is far more complex.
To better understand the potential impact of using an all stainless steel heat
exchanger, let us evaluate an example 400,000 BTU/HR (33 tons or 119 kW) cooling coil. For
the example, we will use 45° F water and a 36” x 45” coil with standard copper tubes and
aluminum fins. The coil for this installation will be 12” deep, weigh 320 pounds and have
a cost factor of 1.0. This is our base unit and is the component currently installed in the
system.
Drilling or workover rigs, iconic symbols of the oil field, are not always required for
drilling, completions or maintenance operations. Increasingly, the
Oil Tubings unit is used for many good
intervention operations and certain drilling applications. Coiled tubing (CT) refers to a
continuous length of small-diameter steel pipe and related surface equipment as well as
associated drilling, completion and workover, or remediation, techniques. Coiled tubing
oilfield technology was initially developed for working on live, producing wells. More
recently, this technology has gained wider acceptance among operators for an expanding
range of workover and drilling applications and for its ability to reduce overall costs.
The trend toward extended-reach wells favors CT for its capability to drill or to convey
tools and equipment in high-angle wellbores.
The Slip On Welded Cement Basket
comprises of slip-on type high strength with flexible bows that are mounted on the end
collar. The cement basket has ability to accommodate much larger than nominal hole sizes.
They are available in 4 ?” to 30” sizes and any kind of specific sizes. With this type of
design cement basket can be rotated and reciprocated. This type of Cement Basket is
available with welded and non-welded convex shape bows.
The Pedal Type Air Pump is one
of the most basic, mandatory tools to own if you want to carry out your own bike
maintenance. The lowly pump is designed to serve a very simple purpose — that of adding
air to your tires. Despite this, many pumps seem to fall short of the mark. So we have put
together this guide to tell you to want to look for, and what to avoid, when buying a bike
pump.
Every cyclist needs a decent track pump (also known as a floor pump), and if you are
building a home workshop it really should be one of your first purchases. This style of
pump will almost always offer a long flexible hose, pressure gauge and large chamber for
quick air transfer.
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