unit 35 plumbing objective to identify plumbing materials and perform basic plumbing procedures
TRANSCRIPT
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Unit 35
Plumbing
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Objective
• To identify plumbing materials and perform basic plumbing procedures
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Competencies
• Identify plumbing tools
• Identify and select pipe
• Identify common pipe fittings
• Assemble pipe
• Maintain water systems
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Tools
• Bench yoke vice• Chain vice• Chain wrench• Pipe wrench• Hacksaw• File• Pipe Cutter• Reamer
• Tubing cutter• Tap and Dies• Flaring tool• Flaring Block• Channel Locks
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Identification
• The nominal, or identifying size of pipe is generally based on the inside diameter. (ID) and outside diameter, (O D) Common sizes used for home or farm are 1/4, 3/8, 1/2, 3/4, 1, 1 1/4 1 1/2, 2, 2 1/2, 3, 4, 6 inch
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Steel Pipe
• Black or Galvanized
• Black pipe is painted and has very little resistance to rust.
• Galvanized pipe is coated with zinc inside and out and has very good resistance to rust.
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Classification
• Standard has a specific ID and OD
• Extra Heavy and Double extra heavy have heavier walls, although the OD remains the same the ID changes.
• All standard fittings will work with the 3 different styles of pipe
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Copper Tubing
• Pipe made of copper is frequently referred to as tubing.
• This tubing is soft and can be bent around irregular shapes so that it can be installed easily. It is preferred to steel because it resist corrosion.
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Disadvantages
• High initial cost
• High degree of expansion
• Bad taste and green stains if the water is slightly acidic
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Classification
• Type k is the heaviest
• Type L is medium
• Type M is the lightest
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Joining
• Copper pipe may be joined in three ways.
• 1. Soldering
• 2. Flaring
• 3. Compression
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Plastic Pipe
• Plastic is the easiest type of pipe to install.
• The term plastic is used to include all pipe made of synthetic materials.
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Types of Plastic
• PVC (Polyvinyl Chloride)
• Used for cold water or waste water applications
• CPVC (Chlorinated Polyvinyl Chloride) used for hot water applications
• ABS (Acrylonitrite Butadiene Styrene) used for underground applications
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Types
• PE (polyethlene) used for pump installation, underground, surface installations. Cold water applications only.
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Joining
• CPVC, PVC and ABS all are joined by gluing.
• PE must have hose barbs and band clamps
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Cast Iron
• Sewer installations
• Available in sizes from 2 in to 6 in.
• Single Hub or Double Hub
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Joining
• Oakum and lead
• Neoprene gaskets
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Pipe Selection
• Each kind of pipe has advantages and disadvantages. When making repairs it is generally easier to repair systems with the kind of pipe used in the original installation.
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New Installations
• When planning a new system, it is important to consider the relative merits of each kind of pipe.
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Soldering Copper
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Gluing Plastic
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Drains
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Sink Faucet
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Tub Faucet
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Valve
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Pipe Fittings