Matched-Die-Molded, Fiberglass-Reinforced Plastic Weir Plates, Scum Baffles, and Mounting Brackets

Abstract

This standard describes the minimum requirements for fiberglass-reinforced plastic weir plates, scum baffles, mounting brackets, lap plates, cover washers, and weir pans, fabricated with the matched-die molding process.

Included are requirements for design, construction, dimensions, tolerances, physical properties, work quality, appearance, and installation.

This standard contains the requirements for using general-purpose and chemical-resistant resins.

These fabrications are generally used in municipal water supply service and industrial water supply service applications.

Exceptions.

This standard does not cover weir plates, scum baffles, mounting brackets, lap plates, and cover washers fabricated with the hand layup, sprayup, or flat-sheet machine-cut method.

Classification.

Resistance to the corrosive or chemical environment shall be determined prior to molding either Type I or Type II fabrications.

Typically, municipal water supply service applications use Type I, and industrial water supply service applications may use either Type I or Type II, depending on the condition of the environment.

Weir plates, baffles, and brackets shall be classified according to type as follows:

Type I.

Fabrications shall be manufactured with a polyester resin of the orthophthalic or isophthalic formulation.

Type I fabrications shall be manufactured of materials suitable for general purpose applications having a temperature range not exceeding 150°F (83°C).

Type II.

Fabrications shall be manufactured with a chemicalresistant polyester resin, such as vinyl ester, bisphenol-A fumarate, or chlorendic formulations.

Type II fabrications shall be manufactured for chemical-resistant applications having a temperature range not exceeding 200°F (111°C).

Purpose

The purpose of this standard is to provide the minimum requirements for matched-die-molded, fiberglass-reinforced plastic weir plates, scum baffles, and mounting brackets, including materials, design, chemical and physical requirements, verification, and delivery.