Contact-Molded, Fiberglass- Reinforced Plastic Wash-Water Troughs and Launders

Abstract

This standard describes the minimum requirements for fiberglass-reinforced plastic wash-water troughs and launders made by the contact-molding process, including flat-bottom, round-bottom, and V-bottom troughs and launders.

Requirements are included for materials, properties, design, construction, dimensions, tolerances, work quality, and appearance.

This standard also describes 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.

Classification.

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

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

Troughs and launders 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 vinylester, 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 contact-molded, fiberglass-reinforced plastic wash-water troughs and launders, including laminate construction and design, chemical and physical requirements, verification, and delivery.