LINE BLANKS

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What are Line Blanks ?

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Line blanks, also known as “line blinds,” covered under ASME B16.48 standards are used to isolate a portion of pipe, usually for maintenance purposes. There are different types of line blanks used to isolate piping by generally inserting a solid disc with seals to eliminate the ability of upstream process liquids and gases to migrate downstream. Even if the seals failed, it is not possible for process fluids to migrate downstream.

Line blanks play a crucial role in piping systems, serving as temporary or permanent closures for pipelines. These blanks, also known as blind flanges or blind plates, are used when there is a need to isolate a section of the pipeline, whether it's for maintenance, repairs, or system shutdowns. By providing a solid barrier, line blanks prevent the flow of fluids or gases, ensuring safety and efficiency in various industrial applications.

Line blanks are commonly used in industries such as oil and gas, petrochemical, power generation, and water treatment. They offer a reliable solution for isolating sections of pipelines during maintenance activities, such as valve replacements, repairs, or inspections. Additionally, line blanks are essential in emergency situations, allowing for quick shutdowns and isolations in case of leaks or other hazardous events.

When selecting line blanks for your piping system, it's important to consider factors such as pressure rating, temperature range, material compatibility, and size. These factors will ensure that the chosen line blanks can withstand the specific conditions of your application, guaranteeing a safe and efficient operation.

Different Types of Line Blanks

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Figure-8 Blank
These types of blinds have a circular, solid disc with seals for isolating. There is also a tie-bar that connects the solid disc to another similar disc, but one that has an inner-diameter so you can have unrestricted flow. The Figure-8 is secured by a bolt on the flange and can rotate between “blinded” (isolated) or “full-bore” position. These blinds are also known as “spectacle blinds” or “figure-8 blank”.

Paddle Blank
These blinds are solid circular discs with seals. There is a handle on the outer diameter of the disc so an operator can insert it between the flanges and isolate the piping.

Paddle Spacers
These spacers are like paddle blanks but have an inner-diameter hole to allow unrestricted flow. Paddle spacers are used to create a pressure containing gap between the flanges such that a paddle blank can be inserted when it is removed.

Materials Used in Line Blanks and Piping

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The choice of materials for line blanks and piping is critical to ensure the longevity and reliability of the system. The selection of materials depends on factors such as the type of fluid or gas being transported, operating conditions, and environmental factors. Let's explore some commonly used materials for line blanks and piping:

Carbon Steel
Carbon steel is a popular choice for line blanks and piping due to its strength, affordability, and versatility. It is suitable for a wide range of applications, including low to medium pressure systems. However, carbon steel may be susceptible to corrosion in certain environments, requiring proper coating or protection.

Stainless Steel
Stainless steel is known for its excellent corrosion resistance, making it ideal for applications where the pipeline is exposed to corrosive fluids or gases. It is commonly used in industries such as chemical processing, food and beverage, and pharmaceuticals. Stainless steel line blanks and piping offer durability and longevity, ensuring a reliable and leak-free system.

Alloy Steel
Alloy steel combines the strength of carbon steel with the corrosion resistance of stainless steel. It is commonly used in high-pressure and high-temperature applications, such as oil and gas refineries, power plants, and chemical processing plants. Alloy steel line blanks and piping provide excellent resistance to stress, fatigue, and creep, ensuring a safe and efficient operation.

Plastic
In certain applications, plastic line blanks and piping may be preferred due to their lightweight, corrosion resistance, and cost-effectiveness. Plastic materials such as PVC (Polyvinyl Chloride) and HDPE (High-Density Polyethylene) are commonly used in industries such as water treatment, irrigation, and wastewater management. Plastic line blanks and piping offer easy installation, flexibility, and resistance to chemical and biological attack.

When selecting materials for line blanks and piping, it's essential to consult industry standards, codes, and regulations to ensure compliance and safety. The choice of materials should also consider factors such as temperature range, pressure rating, compatibility with the transported fluid or gas, and environmental conditions.

Factors to Consider When Selecting Line Blanks

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When choosing line blanks for your piping system, several factors should be taken into consideration to ensure optimal performance and safety. Let's explore some key factors to consider when selecting line blanks:

Pressure Rating
The pressure rating of line blanks should match the maximum operating pressure of the system. It is crucial to select line blanks that can withstand the pressure without any risk of leakage or failure. The pressure rating is typically specified by the manufacturer and should be in accordance with industry standards and regulations.

Size and Dimensions
Line blanks should be selected based on the size and dimensions of the pipeline. It is essential to accurately measure the pipe diameter, flange size, and bolt hole pattern to ensure a proper fit. Using line blanks that are too small or too large can compromise the integrity of the system and lead to leaks or inefficiencies.

Material Compatibility
The compatibility of line blanks with the transported fluid or gas is crucial to prevent corrosion, contamination, or chemical reactions. It is essential to consider the chemical composition, temperature range, and potential interactions between the material of the line blanks and the transported medium. Consulting material compatibility charts and guidelines will ensure the selection of suitable line blanks.

Operating Temperature
Line blanks should be selected based on the expected temperature range of the system. Different materials have varying temperature tolerances, and selecting line blanks that can withstand the operating temperature is essential to prevent deformation, leakage, or failure. It is important to consider both the maximum and minimum temperatures that the line blanks will be exposed to.

Environmental Factors
Environmental factors, such as humidity, UV exposure, and corrosive atmospheres, can impact the performance and longevity of line blanks. It is important to consider the environmental conditions of the installation site and select line blanks that are resistant to these factors. Coatings, protective measures, or alternative materials may be necessary based on the specific environmental challenges.

Price List of Line Blanks

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Prices for Line Blanks are very affordable.

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