GROOVED AND PRESSFIT
Louis E. Hayden, Jr.
Divisional Operations Manager
Victaulic Company of America
The use of mechanical joints in the design and construction of piping systems is
rapidly becoming a general practice. This chapter discusses two types of mechanical
pipe joints. The first is a mechanically pressed joint called Pressfit* that is designed
to join light-wall carbon steel and stainless steel pipe. The second joint is generically
termed a grooved joint. This type of joint is designed for joining any type of pipe,
metallic or nonmetallic, that is capable of being cut or roll grooved.
Both types of joints rely on a mechanical interlock with the pipe end for pressure
and structural integrity and an elastomeric gasket for the pressure boundary seal.
The Pressfit piping system is an innovative, rigid, self-restrained mechanical joining
method for schedule 5 or lighter weight lightweight stainless steel and carbon steel
pipe. This proprietary mechanical pipe joint is designed for use in small-bore piping
systems, NPS ¹⁄₂ (DN15) to NPS 2 (DN50). The Pressfit system may be applied to
any service that is compatible with the piping materials, the gasket material, and
the temperature range of the system, unless prohibited by the manufacturer’s in-
structions. Typical applications would include building-services piping, potable wa-
ter, fire protection, heating and cooling, industrial processes, process cooling and
heating systems, plant utilities, and vacuum systems.
The Pressfit joining system concept is illustrated in Fig. A9.1 The left side of Fig.
A9.1 shows the pipe fully inserted into the Pressfit fitting in the ‘‘unpressed’’ condi-
* Pressfit is a registered trademark of Victaulic Company of America.
FIGURE A9.1 Pressfit joint.
tion. The right side of Fig. A9.1 shows a cross-sectional view of the Pressfit joint
in the ‘‘pressed’’ condition. Note that the pressing operation indents the Press