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Different Types of Spacer Blind Flanges and Where to Use Them

Different Types of Spacer Blind Flanges and Where to Use Them

Spacer blind flanges are essential in the oil and gas industry, as they are required to isolate a specific section of a pipeline or equipment. But did you know that there are various types of spacer blind flanges available in the market? This blog post will discuss the different types of spacer blind flanges and where to use them.

What are Spacer Blind Flanges?

Spacer Blind Flanges are essential components used in pipeline installations to ensure piping systems’ smooth and efficient operation. These flanges act as a barrier between two pipes, preventing fluid or gas flow between them. They come in various sizes and pressure ratings to accommodate different pipelines.

One notable feature of Spacer Blind Flanges is their ability to create an air gap between two pipelines, which helps prevent corrosion issues caused by direct contact with dissimilar materials. This air gap also allows for thorough inspection and maintenance, ensuring the safety and longevity of the pipeline.

In addition to their protective functions, these flanges also serve as connection points for additional equipment such as valves, pumps, meters, or gauges. This makes them crucial for controlling the flow of materials through complex piping systems.

Moreover, Spacer Blind Flanges are manufactured from high-quality materials such as stainless steel or carbon steel that are durable and durable. This ensures they can withstand high pressures and temperatures without compromising performance.

Types of Spacer Blind Flanges and Where to Use Them

Spectacle Blind Flanges:

Spectacle blind flanges, or figure-8 blind flanges, are among the most common spacer blind flanges used in oil and gas industries. They consist of two metal discs connected by a small steel section, giving them their unique figure-8 shape. These flanges are mainly used to isolate a section of the pipeline during maintenance or repair work.

Paddle Blind Flanges:

Paddle blind flanges are the most cost-efficient type of spacer blind flanges available. They are flat metallic disks with a solid handle in the center, which can be rotated for opening and closing purposes. These flanges are mainly used to reduce fluid flow in a pipeline during routine maintenance or emergency shutdown.

Bleed Ring Flanges:

Bleed ring flanges are designed to release excess pressure from the pipeline or equipment. They are mainly used in high-pressure systems with a risk of damage or rupture due to increased pressure. Bleed ring flanges consist of a thick metal ring with small holes or passages that allow the excess pressure to escape.

Spade Flanges:

Spade flanges are similar to spectacle blinds in that they have a solid plate that can be removed to create an open-flow path. However, spade flanges are less versatile than spectacle blinds because the solid plate cannot be inserted back in. They are commonly used in applications where flow is only needed in one direction, such as pump discharge lines.

Ring Spacers:

Ring spacers are flanges that do not have a bore, which means they are used only to create space or a gap between two flanges. They are used when piping systems need to be modified or expanded. They can also be used when there is a need to maintain the gap between two flanges.

Orifice Flanges:

Orifice flanges are another spacer blind flange used in the oil and gas industry. These flanges have a small hole (or orifice) in the center, which can be fitted with a specialized device called an orifice plate. The orifice plate is used to measure the flow rate of the fluid in the pipeline. Orifice flanges are used in systems where accurate flow measurements are required.

Misalignment Flanges:

Misalignment flanges connect pipes or equipment that are not properly aligned due to different factors, such as thermal expansion or accidents. These flanges consist of two pieces that can move relative to one another to accommodate the misalignment. Misalignment flanges are mainly used in high-temperature systems where thermal expansion is common.


Spacer blind flanges are critical components used to isolate sections of the pipeline or equipment during maintenance, repair, or emergency shutdown. In this blog post, we discussed the different types of spacer blind flanges available in the market, such as spectacle blind flanges, paddle blind flanges, bleed ring flanges, orifice flanges, and misalignment flanges. Each type of flange has its own unique features

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