Grooved Pipe Couplings and Fittings

Grooved pipe couplings and fittings are used to join and pipes in both wet and dry system. They provided some flexibility in terms of movement and deflection to the piping system. The concept of grooved coupling was invented in 1925 when Victaulic design the first mechanical coupling. Though many other companies make mechanical grooved couplings, grooved coupling are still known mostly as Victualic pipe coupling or Victaulic style pipe fitting.

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Grooved Coupling Video Overview

 

Grooved pipe fittings consists of grooved couplings, grooved fittings, grooved outlets, grooved valves and grooved replacement parts. Typical application of grooved fittings are in sprinkler risers, pipe feeds passing from one building area to another, locations prone to earthquakes, in discharge line above pump suction, in air or water fire services lines, piping system subject to excessive vibration, installation in tight spaces or where pipe alignment is difficult.

Grooved pipe fittings are limited to use with rolled or cut groove pipe, valve and fittings. These fittings are rated to 175 psi (1205 kPa) as a minimum. Pipe grooves are made according to ANSI/AWWA C606 specification "Grooved and Shouldered Joints".

These couplings are FM approved and can be used in underground services. The maximum ambient temperature for these couplings are 225 deg F (107 deg C)

These couplings are sold by nominal pipe sizes and will fit the corresponding nominal pipes ,valves and fittings.

 

 

 

4 Components of Grooved Pipe Fitting

A grooved coupling or a Victualic style groove coupling has four main components;

1. A grooved pipe (grooved or cut)
2. Coupling Housing
3. Sealing Element (Gasket)
4. Fastener (Nut and Bolt)

Five Benefits of Grooved Piping System

A grooved piping system is most versatile, reliable and economical piping system. It is more reliable than threaded or flanged connection and often results in 2x-4x faster installation. The system is designed to work with rolled or grooved pipes. Flexible grooved pipe couplings offer the flexiblity needed for vibration dampening or installation in earthquake prone areas.

1) Cost Saving

Grooved piping system offers up to 30% cost saving. It offers fast assembly in tight system, cleaner system with no welding slag, contamination or hot work permit. More predictable cost estimate for contractors resulting in faster and cheaper installation.

A simple system with 3 components only	Each pipe joint is a union	Rolled or cut pipe groove

 

2) Each Joint is a Union

Each pipe joint is a flexible joint and removing the couplings allows removal of pipe for easy cleaning, servicing and maintenance. It also allows the flexibility to change the piping system and add / remove equipment.

3) Easy Installation with Rolled or Cut Grooved Pipe

Grooved pipe couplings require creating either a rolled groove or a machine cut groove. A rolled groove creates an indentation int he ID of the pipe whereas the machine cut groove is smooth on the ID. Rolled grooved is mostly done on thinner wall pipe whereas the machine cut groove is more common on thicker wall pipes. Grooved couplings are commonly installed on pipe schedules 5 to schedule 40.

A grooved pipe is much easier than a welded pipe joint, requiring no X Ray, hot work permit and associated hazards of welding a pipe.

4) Minimize Noise and Vibration

Use of grooved pipe coupling isolates the noise and vibration. Resilient gasket absorbs noise and vibration resulting in a quieter system. Provides superior vibration attenuation and eliminates the need of noise suppression devices.

5) Provide Expansion and Contraction

A grooved pipe joint allows for expansion and contraction of the pipe joint without compromising the integrity of the connection. It eliminates the need for costly expansion joints. Grooved pipe joints also eliminates pipe stresses for buried and underground pipes.

 

Five Types of Grooved Pipe Fittings

 

1) Grooved Coupling

A groove is made in the pipe by cold forming and machine cutting a a groove into the end of pipe. See figure below for different between rolled and cut groove. A gasket is housed in the coupling housing and is wrapped around the pipe ends. The groove in the pipe mates with tongue in the pipe and creates a restraint that prevents pipe pull out. Gasket / sealing element creates the pressure barrier. The entire assembly is tightened with bolts and nuts.

Flexible grooved pipe coupling

 

 

 

 

There are two types of basic grooved couplings;

• Flexible grooved coupling that allows a limited amount of angular movement
• Rigid grooved coupling that does not allow movement and is similar to a fanged or a welded pipe joint

 

 

2) Grooved Pipe Fittings

 

Grooved Concentric Reducer	Grooved 90 Deg Elbow	Grooved Tee

 

 

 

Grooved Eccentric Reducer	Grooved and Threaded Adapter

 

3) Grooved Pipe Outlets

 

Grooved Strap Tee	Grooved Mechanical Tee

 

4) Grooved Valves

 

Grooved Butterfly Valve	Grooved Check Valve

 

5) Grooved Replacement Parts and Accessories

 

150# Grooved Weldolet	Grooved X Threaded Nipple

 

Grooved Pipe Fitting Manufacturers

Grooved pipe fittings were introduced in 1925 by Victaulic. Since then several manufacturers have entered the market. Notable among them are;

• Victualic
• Cooplok (by Smith Cooper)
• Gruvlok
• Shurjoint
• Grinnell / TYCO
• AnvilStar

The link below has part number cross referenced between different manufacturers. If you are used to of other brands, the table below will help you choose an equivalent fitting from the other manufacturer.

SCI (Cooplok) Grooved Part Number Cross Reference