4 Inch, DN100 and Actual Pipe OD

The current Solid Universal Flange Adaptor dimensional table includes several DN100 OD ranges, such as:

• ◆  96–116 mm

• ◆  108–120 mm

• ◆  109–128 mm

For replacement projects, measure the pipe circumference at more than one location and convert it to outside diameter. Also check for corrosion, ovality, coatings or surface damage that could affect gasket sealing.

Pressure and Flange Drilling Are Separate Requirements

A 4 inch adapter is not automatically PN10, PN16, PN25 or ANSI Class 150. Size, pressure class and flange drilling are separate specification items.

Provide one of the following:

• ◆  The applicable EN, BS, ISO, DIN, ANSI or AWWA flange requirement

• ◆  Bolt-circle diameter and number of holes

• ◆  Mating valve or pump flange drawing

• ◆  Existing equipment nameplate or dimensional drawing

Where PN25 is required, use only a model whose technical datasheet and approved drawing explicitly confirm PN25 for the selected size.

Construction Options

Depending on the selected model, available specifications may include:

• ◆  Ductile iron or cast iron body components

• ◆  Fusion-bonded epoxy coating

• ◆  Epoxy paint or Rilsan Nylon 11 coating

• ◆  EPDM or NBR gasket

• ◆  Galvanized carbon-steel bolts and nuts

• ◆  Grade 4.8 or Grade 8.8 fasteners

• ◆  SS304 or SS316 stainless-steel hardware

• ◆  Dedicated, universal or restrained connection designs

All component materials should be matched to the medium, temperature, installation environment and project specification.

Restrained or Non-Restrained?

A standard flange coupling adapter may seal the pipe without providing full resistance to axial pullout. Pressure thrust at valves, bends, tees, reducers or dead ends must be addressed by a restrained product, thrust block or other engineered anchoring method.

For PE or thin-wall plastic pipe, confirm whether the selected product requires an internal support insert. The insert helps prevent excessive deformation when the gasket or gripping system is tightened.