Types of Flanges Used in Gas Pipes

Close-up of flange on gas pipe

Close-up of flange on gas pipePipes are an essential component of gas connections. Pipe fittings are also a vital component of these connections, their primary purpose being to connect the gas pipe to the gasket or connect two pipes. Pipe flanges are the standard type of fitting used to make these connections.

The material of choice for these gas pipe fittings is carbon steel owing to its unmatched strength, corrosion resistance, and durability. That said, you should know that there are different types of carbon steel flanges you may opt for depending on your application and requirements. Here are the commonly used flange types.

Slip-On Flanges

This flange has a slightly larger diameter compared to your gas pipe’s outer diameter. It slides and snugly fits into your pipe. Though slipped-on flanges are thinner than most types of flanges, they are cost-efficient, secure and dependable. Hubs and rings are also considered slipped-on flanges since they snugly fit over gas pipes.

Weld-Neck Flanges

These flanges are welded onto the neck of your pipe and have an inner diameter that matches your pipe. They allow stress transfer from the weld-neck flange to the pipe. These flanges are ideally used in high-temperature and pressure applications to enhance flexibility and strength. They are however more costly and bulky compared to other flange types.

Blind Flanges

Blind pipe flanges seal gas pipe ends and efficiently prevent flow. They are typically used when testing the pressure of the gas in your pipe or during repair and maintenance works. They allow the technicians to work around the pipe or inside them easily. Blind flanges can also be used to terminate gas pipes.

Lap joint flanges are fitted over gas pipes. These flanges are typically used together with carbon steel stub end fittings to save costs and prevent issues caused by misalignment of bolt holes. Lap joint flanges are frequently used for applications in which the juncture has no contact with your gas or fluid and those that are frequent dismantled.