Design and Installation Guide for Gasketed PVC Fittings

This document has been developed by the Uni-Bell PVC Pipe Association to serve as a comprehensive guide for the design and installation of gasketed PVC fittings. These fittings are used in various applications, including potable water systems, force mains, pressure irrigation, and reclaimed water systems. The guide specifically addresses gasketed PVC fittings compatible with different dimension ratios and outside diameters of PVC pipes up to 60 inches. It is important to note that this document does not cover solvent-welded or fusible PVC fittings. Types of PVC Fittings The following are the various types of fittings available for use with gasketed PVC pipes: Tees: These fittings have an outstanding leg positioned at a 90° angle to the main pipe, allowing for the creation of a T-shaped junction. Crosses: Crosses have two outstanding legs that are opposite each other, forming a plus (+) shaped intersection. Bends: Bends are used to change the direction of the pipeline. Standard angles available include 11.25°, 22.5°, 45°, and 90°. Custom-built angles can also be manufactured, ranging from 1° to 90°. Sweeps: Sweeps are used to change the alignment or direction of the pipeline while minimizing hydraulic losses. They typically come in angles ranging from 1° to 5°. Couplings/Sleeves: These fittings are used to join two pipes of the same diameter. Their applications include: Connecting existing lines Joining short pipe lengths Repairing damaged pipelines Changing pipeline direction using high-deflection couplings Reducers/Tapers/Adapters: These fittings are used to transition between two different pipe diameters. Tapped Couplings: Tapped couplings are one-piece fittings with pre-molded threads, designed for service taps. They can accommodate various mainline sizes and come with numerous tap configurations. Plugs/Caps: Plugs and caps are used to stop the flow in a segment of the pipeline, typically at dead ends. Custom Products: Custom products can be manufactured according to specific requirements and are available with either push-on or restrained joints. Manufacturing Methods There are three main manufacturing methods used for producing AWWA PVC fittings, all of which utilize gasketed push-on joints. The internal pressure capacity of these fittings is equal to or greater than the pressure rating of the pipe with which they are used. Fabricated Fittings Fabricated fittings are constructed from sections of PVC pipe that meet the AWWA C900 standard requirements. These fittings are made from the same materials as the pipelines they will be used with, ensuring compatibility and durability. The body of the fitting is made from extruded PVC pipe that has already passed standard testing. Fabricated fittings can include single thermoformed bends and couplers. Additionally, multiple segments of PVC pipe can be cut into wedge shapes or prepared to accept leg insertions and joined under factory-controlled conditions to form a homogeneous structure. Reinforcement may also be applied and permanently bonded to the outside surfaces of the fittings. To Know More: https://www.uni-bell.org/Portals/0/ResourceFile/guide-for-pvc-pressure-fittings.pdf

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