2. LESSON OBJECTIVE
At the end of this lesson you will be able to differentiate
between the different methods of joining pipes,
Students are required to take notes throughout the lesson
3. QUESTION?
1. What do you think are the different methods of
joining pipe?
2. What is a trap seal, a valve and a non-return
valve?
4. Joining Pipe
Joining methods refer to both the methods and materials used to
combine piping materials for specific applications. All joining
methods must first and foremost provide secure, dependable, and
verifiable means of combining or joining pipe or tubing
materials. For any given material, there may be multiple accepted
joining methods.
5. Methods of Joining Pipe
• PEX
There are several types of fittings for joining PEX. Two of the connection
methods for PEX are made using Press stainless steel sleeves or PEX crimp
rings. The PEX Press sleeve connection compresses around the tubing and
insert fittings in two places, permanently securing them together. For most of
the types of PEX connections, engineered plastic fittings are increasingly
popular replacing traditional brass versions. Plastic fittings typically offer
both economic and performance advantages.
6.
7. Methods of Joining Pipe• PVC
Solvent welding, also known as solvent cementing, is the process of
joining materials made of thermoplastic resins by applying a solvent
capable of softening the surfaces to be joined, and pressing the softened
surfaces together. Pipe and fittings are bonded together by means of
chemical fusion. Once the pipe and fitting are assembled, a chemical
weld occurs. This weld strengthens over time as the solvents evaporate.
8.
9. Methods of Joining Pipe
• Quick Connection Fittings
Quick connect fittings are manufactured for specific applications and
involve some mechanism that allows the installer to simply slide the pipe
or tubing into a connector, and the connection is complete. In some
cases, snap retainers or screws are used to ensure the connection holds
fast.
10.
11. Methods of Joining Pipe
• Solder
Soldering copper pipe, or “sweating” as it is called in the industry, joins
the pipe by melting a metal alloy between metal pieces to create a fused
joint. Flux, a paste applied to copper pipes and fittings before soldering,
helps the fusion process and prevents oxidation. Prior to soldering joints,
tubing should be severed with a tube cutter and all burrs removed.
12.
13. Methods of Joining Pipe• Welding
Welding is generally defined as the act of joining together two or more
components by heating the parent metal surfaces with an electric arc or arcs,
and producing coalescence (a solid connection) with or without the use of a
filler metal. The most commonly used pipe welding process is Shielded Metal
Arc Welding (SMAW), also known as stick welding. This is an arc welding
process which establishes an arc between a mineral-coated electrode and the
parent metal (pipe).
14.
15. Methods of Joining Pipe
• Threaded
A connection in which an internal threaded fitting and an external threaded
piece of pipe or other fitting are screwed together. Threaded joints may be
used in sizes ranging from 1/4-inch through 12-inch. However, their primary
use is in 4-inch and smaller applications. The fitting materials, which are used
to make threaded joints with standard piping materials, are: cast iron,
malleable iron, ductile iron, cast copper, brass, plastic, and steel. Cast,
malleable, and ductile iron fittings are the most widely used and are
compatible for use with nonferrous piping materials such as brass, copper,
and plastic.
16.
17. QUESTION?
1. What is the most suitable method for joining
PVC pipes?
1. What is the most suitable method for joining
cast iron metal pipes?
