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Stainless Steel Pipe

Stainless Steel Pipe

What is Stainless Steel Pipe?

 

Stainless steel pipe is most commonly found in fluid or gas transportation piping systems. Furthermore, stainless steel pipe is made from a steel alloy that contains nickel and chromium, which give stainless steel its corrosion resistance. Due to its resistance to oxidation, stainless steel pipe is a low-maintenance solution for high-temperature and chemical applications.

Furthermore, stainless steel pipe is typically manufactured by welding or extrusion. In addition, the welding process involves shaping steel into a pipe shape. The seams are then weld together to keep the shape in place. Extrusion, on the other hand, creates a seamless product by heating a steel rod and then piercing it through the centre to form a pipe.

Aside from that, the terms “pipe” and “tube” are often used interchangeably to describe the same product. Despite having the same cylindrical shape, steel pipes are measured by the interior diameter (ID), whereas steel tubes are measured by the outside diameter (OD) and wall thickness. On the other hand, pipes carry fluids and gases, whereas tubes are used to build parts or structural components.

Types of Stainless Steel Pipe

 
  • Seamless Pipe

A seamless pipe is one that contains no seams or weld joints. Because of the metal, it can withstand high levels of pressure as well as high temperatures. It is also used in numerous oil and gas applications. In addition, it is used in the mechanical and engineering industries. As a result, seamless pipes are extremely versatile, and they are always thoroughly inspected to ensure material quality.

  • Welded Pipe

Welded pipes can be found in almost any industry due to their versatility. They outperform in terms of corrosion resistance but not pressure resistance. Welded pipes, on the other hand, are far more cost-effective than most other piping methods. Because of the materials used and their lightweight nature, it may also provide the best value for money.

  • Flanges

Pipe flanges are another critical component of your overall piping setup. Slip-ons, blinds, lap joints, threaded, and semis are among the many styles available. To ensure dependability, these pipe flanges are made of durable and sturdy materials. They also make pipe flanges from high-quality materials.

  • Spectacle Blinds

People will usually use spectacle blinds, spades, and spacers  for temporary or long-term solutions that is allowed for the isolation of piping sections. If a piece of machinery or a section of piping needs to be inspected, spectacle blinds will be used to isolate a specific section of the piping. They will also maintain the overall system during the process. It is recommended that you rigorously test the dependability of your spectacle blinds to stay safe because it is such an important role that is critical to your safety. Because each case is different, it is advised that you consult with a professional before investing large sums of money in spectacle blinds.

Characteristics of Stainless Steel Pipe

  • Corrosion Resistance 

Almost all stainless steel pipes on the market are iron-based alloys with at least 10.5 percent chromium content. When chromium is present in an alloy, it forms a self-healing or protective oxide layer. Furthermore, the formation of an oxide layer contributes to the corrosion resistance of stainless steel pipes. Intact corrosion resistance can be achieved regardless of fabrication method due to the self-healing properties of the oxide layer. Even if the stainless steel pipe surface is damaged or cut, it can self-heal and has a high corrosion resistance. 

  • Work Intensification

One of the most significant benefits of work hardening stainless steel pipe grades is that it significantly increases and improves metal strength while also assisting in cold working. Aside from that, the combination of annealing and cold working stages is simple to use in order to provide adequate strength to fabricated components. Besides that, stainless steel pipe can self-heal and has a high corrosion resistance even if the pipe surface is damaged or cut. 

  • Strength and Formability

The strength of stainless steel pipe varies according to grade. In comparison to mild strength, strength remains somewhat constant in soft conditions. Austenitic steel, which is softer, has a high elongation and ductility. As a result, after a lengthy series of semi-fabrication, it can be cold worked to produce a finished product. Furthermore, toughness and strength must be effectively combined to achieve the desired result.

Ferritic stainless steel pipes are also extremely ductile and strong. Following heat treatment produces hardness and high strength in martensitic steel pipes.

  • Ductility

The percent elongation is responsible for ductility when performing a tensile test. The elongation of austenitic stainless steel is very high. The elongation of austenitic stainless steel is very high. Due to its high work hardening and ductility rates, austenitic stainless steel can form and work in a variety of processes, including deep drawing.

  • High Strength

Stainless steel pipe has a higher tensile strength than mild steel. Duplex stainless steel is generally stronger than austenitic steel. As a result, martensitic and precipitation hardening grades have the highest tensile strength. Furthermore, these grade types are twice as strong as other grades.

  • Magnetic Response

Magnetic response generally attracts stainless steel. Austenitic grades are purely nonmagnetic, though cold working can induce it in a few austenitic grades. Non-magnetic grades, on the other hand, such as 316 and 310, can be cold worked.

Types of Industry where Stainless Steel Pipe is Used

i. Oil and Gas

Technology is critical in the oil and gas industries. As the depths at which we search for oil have increased, so has the demand for corrosion-resistant piping. Hence, there will be more strain putting on the duplex and super duplex stainless steel pipes that we use. Corrosive environments can be extremely harmful. Besides that, if the damage is not repaired, the pipes will easily burst, rendering them unusable for deeper depths. Therefore, it is critical to have strong pipes in the oil and gas industry. 

ii. Nuclear Power

It is difficult to extract useful energy from atomic nuclei. Because of cooling requirements, the majority of today’s nuclear reactors are located near the coast. As a result, it will use much of the water to cool these reactors comes from the sea. And it must be corrosion resistant. Stainless steel pipe is critical in the nuclear power industry. This is because of its capable of resisting corrosion caused by seawater.

iii. LNG                                                                                                                                                          Liquefied natural gas (LNG) is natural gas that has been cooled to -260 degrees Fahrenheit. So, it can be safely transported to meet the growing demand for natural gas. Also, natural gas is not always feasible or cost-effective to transport via pipelines. So, it is instead transported in liquid form via cryogenic sea vessels and road tankers. As a result, having the proper piping in place to provide safe and cost-effective LNG transport to hard-to-reach areas of the country or the world is critical.

Benefits of Stainless Steel Pipe

Stainless steel is a highly adaptable material that can be used in a variety of indoor and outdoor applications. Using stainless steel pipe for your project has several benefits, including:

  • Lightweight
  • Durable
  • Long-lasting Capable of handling high flow rates
  • Simple to machine
  • Scratch resistance
  • Simple to clean
  • Low-maintenance
  • Outstanding corrosion resistance
  • Recyclable and eco-friendly material



LOOKING FOR FLANGESFITTINGS AND PIPES?

Saliran Group has over 10 years of expertise in trading and manufacturing high-quality forged fittings with numerous happy customers all around the world. We supply a variety of stainless steel pipe including stainless steel seamless pipe, stainless steel welded pipe, stainless steel pipe flanges and stainless steel spectacle blinds. 

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Forged Pipe Fittings

FORGED FITTINGS

What Are Forged Fittings?

 
 

Forged fittings are used to connect. branch, blind, or route piping systems with small diameters. Unlike butt weld fiittings, which are made of pipes and plates, forged fittings are made of forging and machining. Also, forged fittings are available in accordance with the standards and specifications of ASME B16.11, MSS-SP-83, SP95, SP97, and BS3799. All of these forged fittings can be used to connect nominal bore pipes. Moreover, they are made of carbon steel A105 and stainless steel SS316. These forged fittings range in size from 1/8″ to 4″. Furthermore, these fittings got their name from the forging process used in their production. The raw material, which is steel alloy or carbon alloy, is heated and formed into a customizable shape during the manufacturing of these fittings.

Besides that, forged fittings are available in both socket weld and threaded configurations. Additionally, these forged fittings are constructed with A105 carbon steel, stainless steel, and even nickel alloy. And all of these raw materials are suitable for the production of pipe fittings. Additionally, forged fittings are heavier, thicker, and designed for use in more demanding applications. Hence, these pipe fittings have pressure classes of 2000#, 3000#, 6000#, and 9000#.

 

The Various Types of Forged Fittings

 
 

There are various types of forged fittings available on the market. For example, 90D elbow, 45D elbow, straight coupling, three-piece union, and three-way tee are among the fitting types. Besides that, end cap, end plug, hex nipple is also available.

Therefore, a three-way tee is arranged in a T shape with one inlet and two outlets. On the other hand, the forged fittings are useful for combining the flow from two channels to a single outlet. In this case, the reducer assists the system in significantly reducing the flow size to a smaller direction.

 Type

Elbow, Tee, Nipple, Plug, Coupling, Cap, Bushing, Union, Cross
& Branch Fittings

Size Range

1/4″ (8mm) – 4″ (100mm)

Standard

ASME/ANSI 16.11, BS3799, BS1740, MSS SP-83, SP95, SP97

Class

3000lbs, 6000lbs, 9000lbs

Thread

NPT (ASME/ANSI B120-1) BSP, BSPT

Forged Elbow Fitting
Forged Tee Fitting
Forged Fittings Nipple
Forged Fittings Plug
Forged Fittings Coupling
Forged Fittings Cap
Forged Fittings Bushing
Forged Fittings Union
Forged Fittings Cross
Forged Branch Fittings

Materials & Specifications

Carbon Steel

  • ASME/ASTM SA/A105N

High Yield Carbon Steel

  • ASTM A694 F42/ 46/ 52/ 60/ 65/ 70

Low Temp Carbon Steel

  • ASME/ASTM SA/A350 LF1/ 2/ 3/ 6

Chrome Moly

  • ASME/ASTM SA/A182 F2, F5, F9, F11, F12, F22, F91

Stainless Steel

  • ASME/ASTM SA/A182 F304/304L, 316/316L, 309, 310, 310H, 317/317L, 321, 321H, 347, 347H

Duplex/Super Duplex

  • ASME/ASTM SA/A182F51, 53, 55, 60
  • UNS S31803/ S32205/ S32750/ S32760

Nickel Alloy

  • ASME/ASTM SB564
  • UNS N02200 (Nickel 200), UNS N02201 (Nickle 201)
  • UNS N04400 (Monel 400), UNS N06600 (Inconel 600)
  • UNS N06601 (Inconel 601), UNS N06625 (Inconel 625)
  • UNS N08825 (Inconel 825), UNS N010276 (Hastelloy C276)

Remark

  • HIC, PED 97/23/EC, NACE MR0175 available

Manufacturing of Forged Pipe Fittings

 
 

Manufacturers adhere to specific standard procedures and norms when producing each marked pipe fitting. Therefore, every forged fitting has a permanent marking on the collar part with the required credentials. Also, the goal of this marking is to keep the user informed while identifying pipe fitting specifications. Other than that, it also allows for the smooth operation of purchase and selection procedures. Furthermore, every forged pipe fitting reflects various marks. For example, the manufacturer’s trademark, the country of origin, the standards, the size, the work pressure capacity, the material, and the pressure.

Characteristics of Forged Steel Fittings

 
 
  • Strong and long-lasting
 

Steel forged fittings have a higher overall strength and toughness than steel processed in other ways. Besides that, forged steel is less likely to shatter when in contact with other objects, making it ideal for items such as swords. This increased strength and durability is due to how the steel is forced into shape during the forging process — by pressing or hammering. In addition, this process stretches the grain of the steel, causing it to be aligned in one direction rather than being random. Also, the forging is cooled in water or oil after pressing or hammering. Therefore, the steel is stronger than if it had been cast by the end of the process.

  • The consistency of forgings
 

As forged steel fittings is a controlled and deliberate process, with each forging going through the same steps. Hence, it is usually possible to ensure a consistent material over the course of many different forgings. Cast steel, on the other hand, is more random in nature due to the processes used.

  • Size Restriction
 

It is more difficult to shape the metal during the forging process. This is because forging occurs while the steel is still solid, as opposed to casting, where the metal is reduced to its liquid form as part of the process. As the metallurgist working with the steel will have more difficulty changing the metal’s shape, the size and thickness of the steel that can be successfully forged are limited. Thus, the larger the metal section under consideration, the more difficult it is to forge.

 
 
LOOKING FOR FLANGES, FITTINGS AND PIPES?

Saliran Group has over 10 years of expertise in trading and manufacturing high-quality forged fittings with numerous happy customers all around the world. We supply a variety of forged fittings such as elbow, tee, nipple, plug, coupling, cap, bushing, union, cross, and branch fittings.

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Butt Weld Fittings


BUTT WELD FITTINGS

 

 

What are Butt Weld Fittings?

 

Butt weld fittings are weldable pipe fittings that allow you to change the flow direction, branch off, reduce pipe size, or attach auxiliary equipment. Furthermore, butt weld fittings made of forged steel are manufactured in accordance with ANSI / ASME B16.9. Butt weld fittings are the most common type of welded pipe fitting, and their nominal pipe size and pipe schedule are specified. Besides that, butt weld fittings begin with seamless or welded pipe and are formed (via multiple processes) into the shapes of elbows, tees, and reducers, among other things. Butt weld fittings are more common in stainless steel because of the cost savings.

Also, butt weld fittings are known as welded pipe fittings. These fittings can provide certain advantages over socket weld and threaded fittings while using in stainless steel and carbon steel. Whereas socket weld fittings are only available up to a certain size, butt weld fittings are available in sizes ranging from 1/2 inch to 72 inch.

 

Types of Butt Weld Fittings

 
 
Butt weld 45° Elbow

45-degree elbow with a long radius (1.5 x Diameter) and a 45 degree change in fluid direction.

 
 
Butt weld 90° Elbow

90-degree steel pipe elbow with long radius (1.5 x Diameter).

 
 
Butt weld 180° return bend

More than a 90-degree elbow is referred to as a steel bend. For example, long radius and short radius 180-degree bends.

Other than that, butt weld elbow dimensions can be specified as diameter (in NPS) and thickness (in schedule 40 or schedule 80) according to ANSI. For instance, long radius 90-degree elbow 4 inch and thickness in schedule 40 or schedule 80.

 
 
Butt weld tee

The vacuum tubing on all three ports of butt weld tee fittings is the same diameter. Hence, tees are commonly used in vacuum piping systems to provide a 90-degree branch.

 
 
Butt weld Reducer

Reducer is a pipeline component. It can reduce the size of the pipeline from large to small bore based on the inner diameter. Therefore, the length of the reduction is equal to the average of the smaller and larger pipe diameters. Moreover, you can also use the reducer as a diffuser or nozzle in this case.

 

 

Butt weld cap

To close off the end of a pipe, a cap will be applied. Hence, the end caps are used to seal or block off the end of a pipeline. Also, the end cap is welded to the relevant sized pipe within the pipeline that requires blocking off or sealing at the weld prep. Unlike a blind flange, which can be unbolted to allow access to the pipeline, the end cap is permanently attached once installed.

 

Specification for Butt Weld Fittings

Carbon Steel ASME/ ASTM SA/ A234-WPB, WPC
High Yield Carbon Steel ASTM A860 WPHY 42/ 46/ 52/ 60/ 65/ 70
Low Temp Carbon Steel ASME/ASTM SA/A420 WPL6
Chrome Moly ASME/ASTM SA/A234-WP5, WP9, WP11, WP12, WP22, WP91
Stainless Steel ASME/ASTM SA/A403WP 304/304L, 316/316L,  309, 310S, 317, 321, 321H, 347, 347H
Duplex/ Super Duplex
  • ASME/ASTM SA/A815
  • UNS S31803/ S32205/ S32750/S32760
Nickel Alloy
  • ASME/ASTM SB366
  • UNS N02200 (Nickel 200), UNS N02201 (Nickle 201)
  • UNS N04400 (Monel 400), UNS N06600 (Inconel 600)
  • UNS N06601 (Inconel 601), UNS N06625 (Inconel 625)
  • UNS N08825 (Inconel 825), UNS N010276 (Hastelloy C276)
Remark HIC, PED 97/23/EC, NACE MR0175 available


How are Butt Weld Fittings Made?

 

Hot forming would be used to create this type of pipe fitting. By that, it would entail bending the pipe and shaping it into a shape. After that, the manufacturer will cut the pipe to length and that pipe will be the starting material of this fitting. Then, this pipe would be heated and moulded into specific shapes using dies. Also, the heat treatment would be performed to achieve the desired mechanical properties and remove residual stresses.


The Advantages of Butt Weld Fittings

  • Inexpensive and simple to use.
  • It can reduce corrosion action and frictional resistance.
  • Welded joints offer more design flexibility and take up less space.
  • It is usually permanently leakproof for a welding fitting connection.
  • Butt weld fittings are continuous metal structure that connects a pipe and a fitting and has a high strength performance in a piping system.
  • The connection has a smooth inner surface and changes direction gradually. The pressure losses and turbulence for fluid transport will then be reduced.

 

What is the Difference Between Short Radius (SR) and Long Radius (LR)?

 

The terms SR45 elbow and LR45 elbow are frequently used. And the 45 or 90 refers to the bend angle for buttweld fitting to change the flow direction. Apart from that, a long radius elbow (LR 90 Elbow or LR 45 Elbow) has a pipe bend that is 1.5 times the pipe size. As a result, a 6-inch LR 90 has a bending radius that is 1.5 times the nominal pipe size. Also, a short radius elbow (SR45 or SR90) has a pipe bend equal to the size of the fitting. So, a 6″ SR 45 has a bending radius equal to the nominal pipe size of 6″.


Looking for flanges, fittings and pipes?

Saliran Group has over 10 years of expertise in trading and manufacturing high-quality butt weld fittings with numerous happy customers all around the world. We supply a variety of flange types such as 45,90&180 degrees elbow, long, short radius & 3D elbow reducer, concentric & Eccentric reducer, equal & reducing tee, and end cap.

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SLIP ON FLANGE

Slip On Flange

What is a Slip On Flange?

 

Slip on flange are also known as SO flange. It is widely known due to its low material cost and ease of installation. There are many different diameters as well as low-pressure models to choose between. Slip on flange, apart from welding neck flanges, lacks a neck to rest on the pipe, necessitating double welding.

 

How Does A Slip On Flange Work?

 

Slip on flange are designed to fit over pipes and are slightly larger inside than pipe. They connect to the pipe via a fillet weld at the top and bottom of the flange. In addition, it is used to insert the pipe into the flange’s inner hole. It is because the flange’s inner diameter is slightly larger than the pipe’s outer diameter. Hence, the pipe and flange can be joined by lap welding at the top and bottom of the flange.

Accordingly, it lacks a weld bevel, hence it is a simple and excellent alternative to a weld neck, allowing the pipe to be adjusted in length relative to the flange’s position. Other than that, the flange’s bore will provide plenty of room for the matching pipe. By that, it provides enough working space for the welder and fabricator to connect.

Besides that, it is very common in low-pressure applications. Most of the flanges would have a hub that looks dimensionally similar to a raised face. If space is tight and also the application enables for a “ring style” slip on, it could be furnished without a hub. Even though the hub style seems to be more usual when referring to a slip on, a ring style slip on without a hub is still considered a slip on flange. In order to have a better connection, the flanges in higher pressure classes are frequently made with the height of a lap joint.

Characteristics of A Slip On Flange

 

Furthermore, there are a few advantages of slip of flange. While using it, it is lower installation costs and less time spent accurately cutting the pipe. In addition, it makes alignment and leak prevention easier. Aside from that, the hub is low on the flange due to pipe slips in the flange. Also, they take up the least amount of longitudinal space for a flange and are available in a variety of diameters.

On the other hand, it is not recommended for high pressure applications or use with hazardous fluids or gases.

Looking for flanges, fittings and pipes?

Saliran Group has over 10 years expertise in trading and manufacturing of high-quality forged flanges with numerous happy customers all around the world. We supply variety of flange types such as blind flange, slip-on, weld neck flange, socket weld, threaded, lap joint flange, and orifice.

Click on the link below to contact us now!  

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Blind Flange

BLIND FLANGE

What is a Blind Flange?

 
 

A blind flange is also known as a solid flange. Blind flange is primarily designed to cap off a line. It is also designed to cover a pipe or nozzle on a vessel that is not being utilised. In addition, a nozzle is normally a pipe that exits a container which is flanged. By that, it can be attached to valves or pipework. A nozzle is frequently blocked off from a blind flange for load tests in a plant or just because the customer doesn’t use all the nozzles that were provided on the tank.

Other blind flanges are made of simple materials, need little machining in comparison to other flanges. Furthermore, blind flanges are weight more than most alternatives since they lack a bore. Other than that, we also offer custom machined parts to match up to slip-on and weld neck flanges. NPT threads in the middle and custom bore holes are common modifications. Blinds can also be provided with high hubs (most API 6BX blinds have high hubs as a requirement).

 

Where are Blind Flanges Most Commonly Used?             

 

In general, the blind flange can have a raised face, a ring joint face, or a flat face. If it has a raised face, we would propose a standard ring gasket suitable for the servicing and/or test. The most common reason a flange may be flat faced is because it was not built to withstand the bending pressures that would come from using a ring gasket or raised face flange.

Also, the blind flange is being used to blank off the end of piping, valves, and pressure vessel openings, similar to a plug or cap. It can be made of cast iron, forgings, specific plates, or flat bars. Unlike a welded cap, the blind flange allows easy access to the inner of a vessel or pipe because it is bolted. Besides that, they are the most stressed of all standard flange types in addition to the internal pressure as well as bolt loading, especially in large sizes.

Looking for flanges, fittings and pipes?

Saliran Group has over 10 years expertise in trading and manufacturing of high-quality forged flanges with numerous happy customers all around the world. We supply variety of flange types such as blind flange, slip-on, weld neck flange, socket weld, threaded, lap joint flange, and orifice.

Click on the link below to contact us now!  

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Type of Instrument valve: Function and Basic

Type of Instrument valve: Function and Basic

1. What is Instrument valve?

  • Instrument measurement shows up in applications that require valves. These applications include static pressure, isolation, differential pressure, Venting, liquid level, gauge pressure and instrument lines. In addition, at the end connection of valves, female NPT & Male NPT can be found.

2. Different type of Instrument valve

 
Hand Valve

The existing of hand valve control the amount of inlet steam nozzles to be used while operating. TESCOM Anderson Greenwood Instrumentation hand valves are suitable for all instrument isolation duties, helping provide bubble tight shut-off time after time. Also, with metal or soft seats for gas, vapor or liquid applications, rated up to 10,000 psig (690 barg), there is a hand valve for even the most severe service. It is available in standard or exotic materials.

Technical Data of TESCOM Anderson Greenwood Instrumentation

Features

Details

Materials

CS, SS, Monel®, Hastelloy®, Duplex

and other exotic materials

Seat

Metal and Soft

Connections

1/4” to 1/2” threaded, flanged, also

suitable for direct mounting

Orifice sizes

3.0 mm (0.12 in) , 4.7 mm (0.19 in)

Pressure max

6,000 psig (414 barg)

Temperature max

538 °C (1000 °F)

Gauge Valve

Typically, a gauge valve works as a single shutoff needle valve to isolate the gauge from the process. For example, TESCOM Anderson Greenwood Instrumentation gauge valves include multi-port and block and bleed styles suitable for gauge isolation, calibration, and venting with a choice of either a globe pattern or straight through bore design. Other than that, a wide choice of end connections and comprehensive range of standard gauge accessories allows complete flexibility for individual installations.

Technical Data of TESCOM Anderson Greenwood Instrumentation

Features

Details

Materials

CS, SS, Monel®, Hastelloy®, Duplex

and other exotic materials

Seat

Metal and Soft

Connections

1/4” to 1/2” threaded, flanged, also

suitable for direct mounting

Orifice sizes

3.0 mm (0.12 in) , 4.7 mm (0.19 in)

Pressure max

6,000 psig (414 barg)

Temperature max

538 °C (1000 °F)

Manifold Pressure

Furthermore, pressure transmitter and differential pressure transmitter require valve manifolds as standard accessories. Thus, range of TESCOM Anderson Greenwood Instrumentation pressure manifolds is suitable for all types of static pressure instruments; from gauges to “smart” pressure transmitters. Other than that, it is available for direct or remote mounting, the pressure manifolds enable isolation, calibration, and venting in a single unit.

Technical Data of TESCOM Anderson Greenwood Instrumentation

Features

Details

Materials

CS, SS, Monel®, Hastelloy®, Duplex

and other exotic materials

Seat

Metal and Soft

Connections

1/4” to 1/2” threaded, flanged, also

suitable for direct mounting

Orifice sizes

3.0 mm (0.12 in) , 4.7 mm (0.19 in)

Pressure max

6,000 psig (414 barg)

Temperature max

538 °C (1000 °F)

3. Choosing Right Instrument valve

Moreover, a number of fundamental factors need to be taken into account when choosing an instrumentation valve. Listed below are some of the main factors to consider.

  • Basic Valve/Packing Designs
  • Pressure and Temperature Considerations
  • Pressure Fluctuation
Looking for Instrument Valve?  

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Industry Update News

Check out our Booth at OGA 2022 (13-15 Sep)

Check Out Our Booth at OGA 2022 (13 - 15 SEP)

We’d love to meet you in person at the the OGA 2022 – 18th Asian Oil, Gas & Petrochemical Engineering Exhibition.

Visit us on 13 – 15 September 2022 at the Kuala Lumpur Convention Centre (KLCC) Hall 2, Booth No: 2805

Locate us on the Map below. See you on the day!

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Difference between Seamless and Welded Pipe

Difference between Seamless and Welded Pipe

Seamless and Welded pipe are the most prominent comparison among different types of piping techniques. To differentiate Seamless and Welded pipe, many factors should take into accounts from Manufacturing process, Length and Size, Working Pressure and Corrosion Resistance, Material Availability and Lead Time until economy and testing.

Seamless Pipe VS Welded Pipe

1. Manufacturing Process

  • Seamless pipe are derived from large piece of solid cylindrical steel, known as billet which is then heated and stretched until it forms into a hallow tube with desired dimensions.
  • Welded Pipe are manufactured from a long-coiled strip, known as skelp which is then rolled by a bending machine until it formed into a tube with desired dimensions. Welding pipe available in a few types such as ERW, SSAW, LSAW, DSAW.

2.  Length and size

  • Due to the difficulties in manufacturing process, Seamless pipe is relatively shorter. Generally, Seamless pipe is produces in nominal sizes from 1/8” to 36”
  • On the other way round, welded pipe does not have any length and size limitation. Hence, in terms of length and size availability, welded pipe is better. 

3. Working Pressure and Corrosion Resistance

  • “Seamless” pipe which named as no seam (crease) or welded joint found, caused a higher working pressure compared to welded pipe. Absent of seam allowed seamless pipe to resist more pressure and load. Hence, corrosion resistance is higher.
  • Conversely, “Welded” pipe which consist of seam due to welding has 20% lower working pressure. Hence, resulting a lower corrosion resistance. 

4. Material Availability and Lead Time

  • The manufacturing of seamless pipe required limited high strength material such as stainless steel, copper, carbon steel, titanium, Monel, Hastelloy, etc. Limited Materials and complex production process caused a longer lead time.
  • On the contrary, manufacturing of welded pipe made by long coiled strip which available in various different material. Hence, shorter delivery and lead time required.

5. Economy and Testing

  • Seamless pipe does not require weld integrity test. However, the complexity of manufacturing process had caused a high costing.
  • Conversely, welded pipe is more economic. It must be tested before use to build a piping system.

Looking for Seamless Pipe and Welded Pipe?  

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