Maintenance Pipefitting

Table of Contents

Chapter 1: Piping Dimensions and Terminology

Topics: Piping standards, dimensions, and symbols; Pipe fittings; Flanges; Using dimensional tables; Calculating length; Straight and rolling offsets

Learning Objectives:

• State whether ID or OD identifies a given nominal pipe size.
• Given a nominal pipe size and a copy of the American Standard Code for Pressure Piping, find the wall thickness of a pipe of a given schedule number.
• Name at least four kinds of pipe fittings.
• Given a schematic drawing of a piping system, identify all fittings used in the system.
• Given a drawing showing three lengths of pipe with and without fittings installed, correctly name the application dimension for measuring the pipe length.
• Given a schematic drawing showing two parallel horizontal pipe runs with a 45 run connection, identify the travel, set, and face-to-face length.

Chapter 2: Threaded Piping Systems

Topics: Thread terminology; Measuring pipe threads; Measuring, cutting, threading, and finishing pipe; Sealants; Assembly; Emergency repair

Learning Objectives:

• Given a descriptive number, identify the pipe size, thread type, and number of threads per inch on a threaded pipe.
• Given a length of unthreaded pipe and required thread specifications, thread one end of the pipe to meet the specifications.
• Given a length of threaded pipe and two threaded fittings, prepare the parts, apply the proper compound, and assemble the components.
• State the important parts of a pipe thread.
• Given actual dimensions for travel and set of a threaded pipe and fitting assembly, use established dimensional tables to compute the total length of replacement pipe needed.

Chapter 3: Welded Piping Systems

Topics: Welded pipe fittings; Welding rings; System alignment; Preparing the work; Squaring the flange; Weld cracks; Inspection; Repair

Learning Objectives:

• Explain what steps to take to prepare lengths of pipe for butt and fillet welding.
• Name the welding ring material used with stainless steel or nickel alloy piping.
• Explain squareness and its importance in a welded piping system.
• Name the major assembly considerations when fabricating flanged connections for a rolling offset installation.
• Given a schematic drawing of this installation, compute the hole compensation angle to be used when positioning the flange for welding.
• Name at least one accessory used to help align two sections of pipe for welding.
• Given a length of pipe and a slip-on flange with a raised face, align and weld the pipe and flange.

Chapter 4: Plastic Piping Systems

Topics: Thermoplastic, thermosetting pipe, Advantages and disadvantages of plastic pipe; Installation; Troubleshooting

Learning Objectives:

• Name the materials used for plastic pipes and fittings.
• Name at least one advantage of plastic piping.
• Name the two most common materials used to make thermosetting plastic pipe.
• Given two lengths of thermosetting plastic pipe, demonstrate how to join then with a bell and spigot joint.
• Name at least one limitation of plastic piping.
• Demonstrate how to align and install fittings on a length of plastic pipe.

Chapter 5: Pipefitting Accessories

Topics: Hangers and supports; Special mountings; Steam trap installation and cleaning; Filter, strainer, and separator installation and cleaning; Expansion joints

Learning Objectives:

• Name the three classes of piping supports and hangers.
• Explain which two types of pipe hangers are most often used to reduce line vibration and shock.
• Explain the factors to be considered when installing pipe hangers for different applications.
• Name the piping system components used to compensate for pipe length changes due to temperature changes.
• Explain the factors to be considered when locating (spacing) pipe hangers in a system.
• in locating them.
• Explain the purpose of a line filter.

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