Dresser Style 131 Dismantling Joint

Double-Ended Flanged Adapter with Longitudinal Adjustment — 4 in through 24 in

Overview

The Dresser Style 131 Dismantling Joint is a double-ended flanged adapter engineered for flanged piping systems where flexibility during installation and maintenance of inline equipment is essential. Where a conventional rigid flanged spool requires exact center-to-center dimensions and a pipe drop to remove a valve, pump, or meter, the Style 131 eliminates both constraints — providing up to 2 degrees of angular misalignment accommodation and between 2 in and 20 in of longitudinal adjustment through a telescoping flanged spool piece.

Both ends feature full-face AWWA C-207 Class D flanges. The inner spool piece telescopes within the outer body, allowing the installer to expand or compress the joint to the exact face-to-face dimension required by the installed equipment. Optional tie rods, integral with the joint, can be added to limit the maximum travel and prevent overextension once the equipment is installed and the line is pressurized. The result is a significant reduction in installation time and a permanent solution to the maintenance challenge of removing flanged inline equipment from fixed-length pipe runs.

Key Features

• Longitudinal Adjustment: Provides 2 in to 20 in of telescoping travel — eliminates the need for precise spool piece fabrication or pipe dropping to remove inline equipment.
• 2 Degrees of Angular Misalignment: Accommodates minor misalignment between connected flanges without stress on the pipeline or equipment.
• Double-Ended Flange Design: Both ends are AWWA C-207 Class D flanges — bolts directly to any mating valve, pump, meter, or fitting without adapters.
• Optional Tie Rods: Integral tie rods limit maximum travel and prevent joint overextension once the system is pressurized. Designed for 150 PSI maximum working pressure.
• Reduces Center-to-Center Criticality: Eliminates the precision pipe measurement requirement during installation — centerline dimension is adjusted in the field.
• Fusion-Bonded Epoxy Coating: Interior and exterior corrosion protection as standard. RED-D shopcoat optional.
• Available 4 in through 24 in Standard: Custom-engineered designs available through 96 in diameter for large transmission main applications.
• Carbon or Stainless Steel: Standard design in carbon steel; stainless steel available for aggressive service conditions.

Materials of Construction

Dimension Specifications — 4 in through 12 in

Closed Length (A) = minimum installed length. Min. Flange Diam. = minimum travel. Flange Length = maximum adjustment range. Flange Thickness (C). Flange OD (B).

Dimension Specifications — 14 in through 24 in

150 PSI MAOP standard. Custom-engineered designs available through 96 in diameter. Consult factory for ANSI 150# and 300# flange options, tie rod configurations, and stainless steel construction.

? TIE RODS: Tie rods are optional and must be specified at time of order. Tie rods are rated for 150 PSI maximum working pressure. Where system pressure exceeds 150 PSI, consult factory. Do not pressurize without tie rods installed if pullout under pressure is a risk.

Questions? Contact us at sales@watermainsupply.com or call 281.664.8000.

Style 131 Dismantling Joint Submittal