DBB Or DIB – Which Should Be Used When?

In recent years, a number of people have misused the term ‘double block and bleed’ when referring to DBB

or DIB. This has led to a number of misconceptions but these can be cleared if we take the definitions drafted by API and OSHA into account.

Definitions of DBB/DIB according to OSHA and API

Both of these entities have their own separate definitions for double block and bleed and double isolation and bleed. API believes that it refers to a single valve that comprises of two seating surfaces which are close to each other and which seal pressure from either valve ends. It also provides a means for bleeding the cavity that is located between the surfaces. API also states that the valve does not offer positive double isolation when only one side of the valve is pressurized.

OSHA on the other hand, believes that DBB refers to the closure of a line, pipe or a single duct which is made possible due to the locking or tagging or two in-line valves. It can also come about by locking, tagging or draining the line between two locked valves.

Some people are also of the opinion that double block and bleed is different from double isolation and bleed. The former offers double isolation blockades from pressure sources with a ‘bleed’ cavity.

Whether you are looking for DIB or DBB valves you can find what you are looking for at SEALEXCEL. The company has a range of valves that it offers at competitive pricing and for a range of industries.

An Insider’s View of the Valve Manufacturing Industry

What are Valves?

Valves are basically mechanical devices that are used to control the pressure as well as the flow of gases, fluids and slurries within an industrial and controlled system. They are also referred to as flow regulators and are used in a variety of industrial based applications. This is why they are available in a range of designs, sizes and colors and all of them are designed according to their core operational use.

Quality Standards

When it comes to quality standards, how well a valve can function is determined by a number of regulatory bodies and each inspects a different aspect. Some of them are as follows:

MSS – this quality standard is applicable on valves made of steel and allow of 1 inch pipes or smaller. The pressure rating of these valves has to be 10,000 psi and lower than 100° F.

NACE  - This quality standard applies to valves that are used to deal with corrosive materials such as chemicals.

API – This is by far the most important quality standard for all industrial equipment. It defines the test requirements as well as inspection for valves that are purchased according to standards it sets. It can also be used for other valves that are used in the chemical or petroleum industry.

ANSI B16.34 – This quality standard applies to process valves that come with a pipe flange and pipe thread ends. It is used to determine pressure and temperature, materials, the thickness of the walls, requirements in design etc for these valves. However, it cannot be used for instrument valves.

Industries that use Valves

Valves have a large role to play in a number of industries but particularly oil and gas and petroleum. They are used to regulate pressure in thousands of miles of pipelines from their source to locations where raw material is transformed into its final form. These are also commonly used in piping for crude oil/gas onshore and off because they can optimize pipeline operating systems in multiple sections of the pipe. 

Due to a need for deeper wells, lower production costs and larger pipelines, these valves have become a

necessity in Oil, Gas and Petroleum plants. Valves have to be durable, last longer and perform better to meet production and quality demands irrespective of the industry that employs them. This includes withstanding high pressure and extreme temperatures.

SEALEXCEL offers toggle, bleed, ball, check and a number of other valves that can meet pipeline and pressure needs in a number of industries. Check out their website for more information

A Guide to Assembling Twin Ferrule Compression Fittings

Twin Ferrule Compression Fittings are generally great for leak-free connections, which is often the case with process instrumentation and industrial applications.  

Aimed to meet the requirements of the oil & gas, petrochemical, power-based industries, twin ferrule compressions are one of the most demanded options in fittings.

In addition to guaranteeing best possible performance and value for high-pressure or vacuum fitting needs, they work equally well for increased or decreased temperatures, vibrations and quick loading, and acerbic or dangerous surroundings. 

Stated below is a quick guide to assembling twin ferrule compression fittings; keep on reading:

A Few Pre-Assembly Instructions

Step#1 – Cling to a pre-assembly tool in a vice. A vice is basically an automatic instrument that’s used to protect an object to facilitate work to be undertaken. Then, bring the joint together by following the instructions laid down in the product’s manual. 

Step#2 – Detach the tube from the pre-assembly tool. 

Step#3 - Place the tube assembly into the body and then track the instructions for re-assembling found in the same manual.

Pre-Assembly Guidelines and Considerations

Generally, pre-assembly tools are made using toughened Maraging Steel. Maraging steel is basically a steel alloy that comprises 25% nickel and other metals. Moreover, they are intended to hold out recurring assemblies. In addition, pre-assembly tools are also utilized to ascertain that the joints are accurate.

For best results, it is important to guarantee that assembling tools are clean, sanitized and well lubricated. 

If you’re thinking why pre-assembling procedures are important, here are some reasons: the assembling process can bring forth a host of complications and obscurities, particularly if the compression fittings are to be utilized in limited spaces. Generally, broad wall tubes and adaptors of vertical pipes (extending from water supply) can also sprout multiple problems. Pre-assembly guarantees that the fittings are placed and installed in the most precise manner. 

Lastly, pre-assembling lessens installation problems when the size of tube goes beyond 1/2" (12mm) OD. 

Assembling the Twin Ferrule Compression Fittings

Step#1

Slash the tube as per the needed length. However, make sure you leave the ends straight to the axis of the tube, getting rid of all rough projections.

Step#2

Now, fit in the prepared tube within the fitting assembly, making sure that the end of the tube completely makes way into the fitting and covers the supporting diameter. Ensure the nut is tightly fixed.

Step#3

For sizes such as 1/16", 1/8", 3/16", stiffen the nut 75% of a turn to conclude the assembling process.

As far as the other sizes are concerned, 1.25 turns from finger-tight will work fine.

If you’re on the lookout for high-quality and affordable twin ferrule compression fittings in India, SEALEXCEL is your ultimate pick. 

They also provide diverse industries with stainless steel pneumatic check valve, push-on fittings, instrument needle valve, and more. Visit their website https://sealexcel.com/ now.

3 Things You Must Know About Seamless Tubing

Seamless tubing, predominantly seamless tube made from stainless steel, has a diverse range of applications. They are used in solar dishes, water lines, and are a core component of a host of products.

Given its wide usage, here are three things about seamless tubing you may not have known:

1.      How Seamless Tubes Are Made

Extrusion is one way through which seamless tubes are produced.

According to this process, a metal and another material are pushed through a die to produce required shapes. Extrusion starts with a piece of accustomed steel of a certain grade. The tubes are forced out from a metal bar, and then rehashed with a die. The seamless tubing is treated under heat in a void heating system and processed, sterilized, and re-processed to help it reach the desired size and state. Generally, seamless tubes are capable of being reduced until the internal diameter equals the size of a human hair shaft.

2.      Applications of Coiled Tubing

Few of the biggest advantages of making use of stainless steel coil tubing is that it lessens the danger of contaminants, improves resilience against corrosion, and brings installation costs down across varying applications. This is the reason why coiled tubing serves as a perfect choice for severe surroundings.

Seamless tubing has a wide application in the Oil & Gas industry. They are used for controlling lines, injecting chemicals, and assuring safety at sub-sea level through safety valves. 

Moreover, the Chemical Process and Instrumentation industry has common applications including:

·         Steam & heat trace bundles,

·         Measurement and sensing of flow, and

·         Transfer of gas and other fluids.

Seamless tubes with a lesser diameter are trusted and deemed reliable for conducting gas chromatography and high performance liquid chromatography (HPLC). That’s because companies now need small-sized samples to be treated at elevated speeds. Seamless tubing is also utilized to understand most of such high-accuracy systems.

Some of the latest applications of these tubings include the transfer of condensed natural gas for refueling motor vehicles and transfer of hydrogen for applications pertinent to material handling. 

The key advantage of these applications is that they are time-saving and require lesser labor. That’s simply because they don’t need manifold fittings. Seamless coil tubing have applications in other industries as well including aerospace, substitute energy, ship construction, and healthcare. 

3.      Seamless Coil is Available in Various Lengths and Forms

Seamless tubing is found in a range of superior-performing, rust-resistant alloys and dimensions perfect for supreme purity, military, airplane, medical and all-purpose apparatus applications. Typically, seamless tubing can be purchased in a coiled or straight form, as per your need. 

Looking for high-quality tube fittings and valves for industrial applications? SEALEXCEL has you covered for all. From pipe fittings, to pneumatic fittings, and push-in fittings, they’re one of the best suppliers in India. Visit their website https://sealexcel.com/ to learn about their product lines.