Flanges

  • Slip On Flange
  • Blind Flange
  • Lap Joined Flange
  • Weld Neck Flange

Slip On Flange:

A slip on flange is a bored cylindrical shaped flange that is used to connect valves, pipes, pumps and other equipment to aid in forming a pipe work system. Some benefits of a slip on flange are that it provides easy access for maintenance such as inspection, modification and even cleaning. The typical installation of a slip on flange is to simply slide it over the pipe and then weld it across the diameter of the pipe (fillet welded is the most common form). If the purpose of the slip-on flange is to connect it to another slip-on flange, then the bolt holes are aligned and screwed in using industrial grade bolts.

Typical applications:

  • Low pressure applications
  • High temperature applications

Advantages:

  • Easy to align with bolt holes
  • Easy to cut and modify
  • Lower initial cost than other flanges
  • The most common stocked type of flange due to the fact that one size fits all pipe schedules.
  • Dependable for preventing leaks

Material:

Carbon steel, alloy steel, stainless steel

Blind Flange:

A blind flange is similar in design (cylindrical shape) to a slip-on flange; however it has a closed-off end and is not bored. The purpose of a blind flange is mainly to seal the ends of valves and pipes. Blind flanges also have bolt holes in order to be bolted down as the final piece of equipment at the end of a pipe system. This flange is used at the end of pipe lines, valves, and pumps. Another usage of the blank flange is for inspection purposes; it will simply unbolt.

Advantages:

  • Easy access to a pipe line (inspection, maintenance, cleaning, etc)
  • Withstands a lot of pressure
  • Allows for expansion/continuation of pipeline

Material:

Stainless steel, carbon steel, alloy steel.

Lap Joint Flange:

Lap joint flanges are nearly identical to slip-on flanges with the exception that lap joint flanges have a curved radius at the intersection and face to accommodate a lap joint flange stub end lap joint. Ideally, lap joint flanges are used in pipes that require maintenance such as frequent dissembling, repair, or even replacement. The stub-end insert can be rotated with ease which in return makes aligning the bolts a simple task for the installer/maintenance personnel. Despite their similarity to slip-on flanges, lap joint flanges are not recommended for applications that boast high pressure and high temperature specifications.

Typical Applications:

  • Applications that require frequent joint disassembly
  • Applications that require simple bolt alignments

Advantages:

  • Flexibility
  • Easy bolt alignment procedure
  • Easy to dismantle for high maintenance requirement applications
  • Applications that require regular inspection

Material:

Stainless steel, alloy steel, carbon steel

Weld Neck Flange:

A weld neck flange is the industries preferred choice of flange due to its ability to withstand extreme pressure. Used mainly when critical applications are needed, this flangeā€™s tapered hub design offers a tremendously strong connection. The greatest characteristic of a weld neck flange is that it can be frequently bent and maneuvered without any compromise to the existing connection and material.

Typical Applications:

  • Critical applications
  • Applications that require extremely high and low temperatures
  • Applications that require a very high pressure threshold.
  • Applications that require a very strong connection
  • Services requiring the movement of hazardous fluids

Advantages:

  • Considered one of the strongesttypes of flanges
  • Prevent turbulence
  • Reduce corrosion
  • No restriction of product flow
  • Offers first-rate stress allocation through the tapered hub
  • Easily radiographed for flaws

Material:

Carbon steel, stainless steel, alloy steel.

Socket Weld Flange:

Socket weld flanges were primarily developed for use with small-sized pipes that are capable of withstanding extremely high pressure or even contact with chemicals.