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Blind Flange

Shanxi Sinomach Co., Ltd.：Your Leading Blind Flange Supplier

 

Shanxi Sinomach Co., Ltd. is an industrial international supplier focusing on the design, production and sales of flanges, valves and other pipe fittings.

 

Since its establishment, the company has always adhered to the business principles of customer-oriented and honest business, with the purpose of meeting customer needs, and providing customers with all-round solutions and high-quality products. This makes our company a long-term partner trusted by many international customers.

 
 
Why choose us?

Our Factory

Factory covers an area of 24,500 m2 and has many professional and technical personnel, annual production capacity more than 20,000 tons/year

Our Service

Whether it is pre-sales consultation, sales, or after-sales, we will answer customers' questions 24 hours a day and provide fast and effective solutions until customers are satisfied.

Our Equipment

Our there are 7 sets of forging equipment and 10 sets of heating equipment,the product quality is safe and reliable, reaching the international standard.

Product Application

Our wind power tower flanges, pressure vessel flanges, and petrochemical flanges are used in water conservancy, oil, natural gas and other pipelines.

 

Types of Blind Flanges

 

Raised face blind flanges

Raised face blind flanges feature a raised ring around the face of the flange, creating a seal when mated with a similarly raised face flange. This design is suitable for high-pressure applications due to its increased sealing surface area.

Ring joint blind flanges

Ring joint blind flanges utilize a metal ring gasket to seal the connection. This type of flange is particularly effective in high-pressure and high-temperature applications, as the ring gasket can withstand extreme conditions.

Flat face blind flanges

Flat face blind flanges have a flat face without any raised areas. This design is less common than raised face or ring joint flanges due to its lower sealability. However, flat face flanges are still suitable for low-pressure applications.

Weld neck blind flanges

Weld neck blind flanges are attached to the pipe by a circular weld around the neck of the flange. This design provides excellent strength and is suitable for high-pressure and high-temperature applications.

Close nipple blind flanges

Close nipple blind flanges are similar to weld neck flanges, but they have a shorter neck. This design is typically used in tight spaces where a full-length neck would interfere with other components.

Benefits of Blind Flanges
 

Leak prevention: Blind flanges create a secure seal, preventing leaks in the pipeline.

 

Maintenance convenience: They make it easy to isolate sections for maintenance without disrupting the entire system.

 

Pressure relief: Blind flanges can be used for pressure relief when necessary, typically when ports are created in their body.

 

Safety: They ensure safety during pressure testing and maintenance by blocking off hazardous substances.

 

Versatility: Blind flanges are suitable for various pipe materials and sizes.

 

Cost-efficiency: They are cost-effective solutions for sealing pipe ends and reducing downtime.

 

Easy installation: It is simple to install and remove as needed.

ANSI Blind Flange

 

DIN Blind Flange

Longevity: Blind flanges are durable and corrosion-resistant, extending their lifespan.

 

Customization: They come in various materials, including stainless steel, carbon steel, and more, to suit specific applications.

 

Adaptability: Blind flanges are suitable for high-temperature and high-pressure environments.

 

Reduced maintenance costs: They minimize the need for frequent maintenance and repairs.

 

No flow restriction: Since they have no bore, blind flanges do not obstruct flow when not in use.

 

Uniform stress distribution: They distribute stress evenly across the flange face.

 

Compatibility: They are compatible with different flange types, making them versatile in various systems.

 

Enhanced safety: They reduce the risk of accidents and environmental damage by providing a reliable closure.

Applications of a Blind Flange
 

Oil and gas

Blind flanges are used in oil refineries, petrochemical plants, and offshore platforms for system isolation, pressure testing, and equipment maintenance.

 

Chemical processing

In chemical processing facilities, blind flanges seal off pipelines during batch processing, cleaning, or equipment inspections.

 

Water treatment

In municipal water treatment plants and industrial facilities, blind flanges are employed in piping systems to control flow and isolate sections for repairs or upgrades.

 

Power generation

In power plants, blind flanges are utilized in steam, water, and gas pipelines to temporarily or permanently close them during maintenance shutdowns or equipment replacement.

 

HVAC systems

In heating, ventilation, and air conditioning (HVAC) systems, blind flanges seal off ductwork or piping branches to control airflow and pressure distribution.

 

Product Parameters

 

Standard Nominal Diameter(mm) Pressure Class (MPa) Material
GB/T 9112~9124-2010 DN15-DN3000 PN1.0, PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42 Carbon steel
Stainless steel
EN 1092 DN15-DN3000 PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160 Carbon steel
Stainless steel
BS 3293, 4504, 4505 DN15-DN3000 PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160 Carbon steel
Stainless steel
Remarks:
1. For the details of GB Blind Flange that you need, you can contact us at any time to provide you the better solution;
2. We have the ability to produce non-standard flanges according to the drawings provided by customers, and can also provide drawings and calculations of flanges according to the design parameters of the flanges.

 

 

Package&Transport

We will implement the packaging materials and methods of the product in accordance with the terms of the contract signed with the customer, and choose the transportation method approved by the customer (such as sea freight, sea freight, etc.) according to the actual situation to ensure that the product reaches the customer safely and quickly.

productcate-1-1

Other Services
 

Payment terms

30% deposit in advance, 70% balance before shipment.

 

 

Min.order

1 pkg.

 

FAQ

Q: What is a blind flange?

A: A blind flange is a flat, circular plate used to close or seal the end of a pipe or pipeline. It is commonly used in piping systems to block off flow and prevent the escape of fluids, gases, or other materials.
Blind flanges are available in various sizes and materials to match the specific requirements of the pipeline they are used with.

Q: What are the advantages of blind flanges?

A: Blind flanges are relatively simple to install and remove compared to welded or bolted pipe closures, and they provide a secure seal for the end of a pipe, preventing leaks and ensuring that the pipeline remains pressurized or safe.

Q: When should I use a blind flange?

A: When a pipeline is not in use or needs to be closed off temporarily, a blind flange is the ideal solution to seal the end and prevent leaks.
Blind flanges are useful during maintenance operations where sections of the pipeline need to be sealed off while work is carried out on the system.

Q: When should I not use a blind flange?

A: Blind flanges completely block off the pipe, which makes them unsuitable for applications where continuous flow of liquids or gases is necessary.

In situations where a significant amount of pressure or fluid velocity is present, the blind flange may not provide a reliable seal or could potentially fail under extreme conditions.

Q: What are the different types of blind flanges?

A: Blind flanges are available in various types, including slip-on flanges, threaded flanges, weld neck flanges, and socket weld flanges.

These types allow for flexibility in choosing the best blind flange depending on the specific requirements of the pipeline system, such as pipe size, pressure, or installation method.

Q: What is the difference between RF blind flange and FF blind flange?

A: In those situations, it's best to use an RF flange, as they are designed to withstand more demanding environments. The FF flange is better for operations that are lower pressure and temperature and in systems where cast iron, fiberglass, or other materials that may break as the bolts are torqued are being used.

Q: How do you use a blind flange?

A: Installing a blind flange is relatively straightforward. It is bolted onto the pipe's open end using the holes around its circumference. A gasket is often placed between the flange and the pipe to ensure a tight and leak-free seal. Tightening the bolts evenly provides a secure connection.

Q: What is the difference between a flat face and raised face blind flange?

A: When it comes to the best flange face for your project there are many factors such as pressure, temperature and purpose. Flat face flanges are best for operations with low pressure and low temperature. Raise face flanges are designed to endure more challenging situations.

As one of the leading blind flange manufacturers and suppliers in China, we warmly welcome you to buy high-grade blind flange for sale here from our factory. All our are with high quality and competitive price. For more information, contact us now.

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