Teaching by Demonstration

Teaching by Demonstration

The Department of Agricultural Education
The University of Arizona

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Area: Horticulture Mechanics

Unit: Irrigation, Pipe and Tubing

LESSON # 7: Join PVC Pipe

COMPETENCY:

To construct a sprinkler project.
Irrigation installation is a key component for the landscaping industry.

Need:

Students can develop an S.A.E. program designing and installing irrigation/sprinkler systems.
The skill can be used in Ag. Mechanics career development events.

LESSON OBJECTIVES:

1. Using a PVC cutter, reamer, PVC primer, and PVC glue, to cut ream and join PVC Pipe.

INTRODUCTION:

1) Review previous lesson
2) Interest approach/Realia .Sprinkler project
3) Leading questions

	Today we will begin practicing the one of the skills we need to construct our sprinkler project. Can someone tell me which skill we will be practicing?
	Why is this is important? (so we don't waste a bunch of material on our projects) .
	Back a couple of lessons we covered the tools and equipment used to work with PVC pipe, what are some of the tools and equipment we will be using today?

4) Explain to class procedure for moving into the shop.

	Pick up a pair of safety glasses and put them on before entering the shop .
	Go over to the table with tools and equipment.
	Have one row of students sitting around the table in a semi-circle.
	Have one row of students standing behind the others .
	Do not horse around when going into the shop.
	Once at the table, keep your hands to yourselves 5) Ask if any questions

DEMONSTRATION:

1. Teacher does and tells and also asks questions about tools and uses 2. Student does and teacher tells and asks questions

SUPERVISED PRACTICE:

1. Hand out job operations sheets.
2. Be sure that job operation sheets go into notebooks, and students follow the job operation.
3. Be sure safety practices are followed.
4. Circulate to each group to assist students.

1. Review lesson based on objectives
2. Relate to next lesson -Sweat Soldering Copper Tubing

APPLICATION

1. Sufficient equipment available to break students up into three groups.
2. Completion of the evaluation from on the job operations sheet will be required for each student.
3. Students not meeting minimum standards will be required to repeat operation.
4. Each student must submit a solvent welded pipe and fItting with the evaluation.

MATERIALS NEEDED:

PVC pipe cutter with reamer 1/2. PVC Pipe

PVC Primer 1/2. PVC Fitting

PVC Solvent

REALIA:

Sprinkler Project

SCIENCE/MATH CONCEPTS:

Science -Fusion of plastics

JOB OPERATION SHEET

AREA:

UNIT: Irrigation, Pipe, and Tubing

JOB: Joining PVC Pipe and PVC Pipe Fittings

OBJECTIVES:

Using a PVC cutter, reamer, PVC primer, and PVC glue, to cut, ream and join PVC pipe.

TOOLS	MATERIALS	REFERENCE
PVC Pipe Cutter with Reamer PVC Primer PVC Solvent	1/2" PVC Pipe 1/2" PVC Fitting

Steps of Procedure	Key Points
A. Cutting and preparing pipe for gluing
1 Using a tape measure, place a pencil mark where the cut is to be made on the pipe. 2. Using the PVC pipe cutter, spread the handles completely open. 3. Place the blade of the cutter directly over the pencil mark on the PVC pipe. 4. Squeeze the pipe cutter handles a number of times until the blade of the cutter cuts through the pipe. 5. Using the reamer on the pipe cutter, ream the inside edge of the pipe by twisting the reamer back and forth. 6. Place the reamer on the outside edge of the pipe and ream the outside using the same procedure. 7. Check the pipe for fit with the fitting.	a. To ensure a straight cut, make sure the cutter blade passes through the pipe in a straight line, perpendicular to the pipe. a. CAUTION: The reamer may be inside sharp, do not cut yourself! b. Make sure all burrs are removed from the edge of the pipe. This is important for a good fit. a. The edge of the pipe should have a slight bevel when done.
B. Priming and Gluing the Pipe
1. Using the dauber attached to the primer can the lid, apply a thin coating of primer to the fitting and pipe then to the pipe end. 2. Using dauber applicator attached to glue can lid, apply a thin coat of cement to fitting and to the pipe end. 3. Quickly insert the pipe into the fitting and turn the pipe 1/4" inch. 4. Wipe off excess glue.	a. The primer is used to clean and help the glue bond to the plastic. b. Only a thin coat of primer is needed. c. Remove excess primer from -- dauber. d. Caution: Fumes are toxic and flammable. Do not breathe and keep away from flame. a. Remove excess glue from the dauber. b. Ensure complete coverage over pipe and inside fitting. a. Hold the pipe in the fitting for 30 seconds. This is done so the pipe is not pushed out of the fitting by the glue.

Name___________________

EVALUATION

Joining PVC Pipe and PVC Pipe Fittings

FACTOR	CRITERIA	POSSIBLE POINTS	STUDENT RATING	INSTRUCTOR RATING
1. Pipe cut to proper length	Length + or – 1/8 of an inch	5
2. Application of primer and glue	Pipe and fitting are completely fused with no leaks	5
3. Proper amount of glue and primer	Glue is not blocking flow through the pipe	5
4. Pipe wiped clean	Excess glue is removed from the outside of the pipe	5
5. Time Used	Knowledge of job with few false motions	5
TOTAL		20

Questions or problems regarding this web site should be directed to billye@ag.arizona.edu. Copyright © 2000 Department of Agricultural Education. All rights reserved.
Tuesday, 23 August 2005

College of Agriculture and Life Sciences at the University of Arizona