Bending Pipes

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Module 26107-08Hand Bending

Lesson 1 of 3: Introduction to Hand Bending

This lesson is a classroom and lab session in which the students will beintroduced to hand-operated equipment that is used to make bends in all types of conduit, including electrical metallic tubing (EMT), P !, and rigid conduit" Thelesson will conclude with a performance requirement in which the students willmake a #$% bend and back-to-back bends in EMT using a hand bender"

Ob ecti!es

&pon completion of this lesson, the student should be able to'

" dentify *arious types of hand bending equipment and on what type ofconduit it is used"

+" pply basic geometric rules in making #$% bends in conduit"

" Make a single #$% bend in EMT"

." Make back-to-back #$% bends in EMT"

"erfor#ance $e%uire#ents Make a #$% bend and back-to-back #$% bends in EMT using a hand

bender"These tasks partially satisfy module Performance Task "

$eading &ssign#ent Module +/ $0, 1ections "$"$ thru +"."$

'lide "resentation Module +/ $0, Part (1lides thru +)

'uggested (%ui)#ent*Materials

ppropriate personal protecti*e equipment 1ufficient sections of 23 EMT for lab work

43 and 3 EMT pieces for demonstration only 5acksaw 23, 43, and 3 EMT hand benders 23 rigid conduit hickey bender P ! bending unit P ! bending plug set P ! conduit

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6et rags for cooling heated P ! 1ufficient sections of 23 rigid metal conduit 1ufficient sections of 23 intermediate metal conduit !onduit reamer Tape measure Marker Plastic #$% triangle Torpedo le*el

'uggested 'tudent &cti!it+

1tudents should identify the different types of conduit and conduitbends that are *isible when *isiting shopping malls, homeimpro*ement stores, and other public buildings" The NationalElectrical Code requires all wiring in commercial buildings to beinstalled in some type of raceway, unlike residences in which cablemay be run within walls and ceiling areas"

,esting

Module 7e*iew 8uestions - / !9:T7E: !onnect cti*e ;igures / and


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SLIDE 6

=emonstrate ho to bend P?& conduit usin3 a P?& heatin3 unit$

E -lain to students that if a heatin3 unit is not available, P?& conduit can be bent usin3 a -ro-ane hand torch, but this re+uires -ractice in order to -revent conduit from burnin3 and@or "in"in3$

*t the discretion of the instructor, students may -ractice bendin3 P?&, butonly under strict su-ervision and safe or" -ractices$

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SLIDE 7

=emonstrate the use of P?& bendin3 -lu3s, if available$

E -lain that -lu3 sets are ty-ically used for bendin3 P?& conduit that is )inches in diameter or lar3er$

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SLIDE 8

=efine the three sides of a A/B trian3le usin3 a -lastic trian3le$

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SLIDE 9

E -lain the formula for findin3 the circumference of a circle$

#ave the students -ractice findin3 the circumference of a circle based ondifferent radii and diameter measurements$

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SLIDE 10

=emonstrate ho to ma"e a A/B bend in ; E 2 usin3 a hand bender$

#ave each student measure, mar", and bend a A/B bend in a section of ;E 2$

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SLIDE 11

Co over the 3ain table ith the students and e -lain ho it is used toobtain an e act stub len3th$

=emonstrate ho to cut a -iece of ; E 2 and ma"e a A/B bend usin3the hand bender so that the measurement of the stub len3th is 1) inches D

4inch$

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SLIDE 12

=iscuss the situations in hich bac"4to4bac" A/B bends mi3ht be used$

=emonstrate ho to ma"e bac"4to4bac" A/B bends$

#ave each student -ractice ma"in3 bac"4to4bac" A/B bends$

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TESTING and PERFORMANCE

#ave the students ans er 'evie uestions 1 thru < for Sections 1$/$/ F)$6$/$ Provide correct ans ers and remediation at the end of the +ui7$

#ave the students com-lete *ctive Gi3ures < and >$

Students must ma"e an acce-table A/B bend and bac"4to4bac" A/B bends in; E 2 usin3 a hand bender$ 2his can be done durin3 the -resentation of

Slides 1/ and 1) or at the end of the lesson$ 2his -artially satisfiesPerformance 2as" 1$

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