Heat Trace Systems

Front 1

series fixed resistance is

Back 1

is heat produced from running a resistance in series with the voltage source

Front 2

2 cables for series fixed resistance are

Back 2

mineral insulated and polymer insulated

Front 3

MI is

Back 3

mineral insulated

Front 4

heat trace is primaraly used for three reasons

Back 4

prevent freezing

melt snow and ice

maintain a fluid temp in the pipe

Front 5

MI cables describe them

Back 5

1 or more bare wires in a metal sheath packed with insulation and the MI is magnesium oxide or silicon dioxide

the sheath is copper of stainless steel

Front 6

how is a MI cable constructed

Back 6

resistive conductors connected to non resistive conductors then after MI and sheath in installed

a pigtail in attached to a connector for terminating to power

Front 7

review pg 3

Back 7

good diagrams

Front 8

which section of heatrace is resistive hot or cold section

Back 8

hot section is resistive

Front 9

how can you adjust heat trace in the field

Back 9

you cant its always custom order with custom length and heating

a trained person may repair not a sparky

Front 10

polymer cables are different because

Back 10

they have a weather proof plastic sheath

and the insulation inside is polymer plastic rather than mineral

Front 11

how many conductors for polymer insulated cables?

Back 11

3

1 for duel termination

2 for only single one end termination

3 for three phase wye heating cable with one end termination

Front 12

polymer will have its length decided by

Back 12

by you when you cut it to the desired length the max length tho is ... see hint

Hint 12

3500m long!!!

Front 13

parallel fixed resistance is

Back 13

resistive heating elements ran in parallel

Front 14

Back 14

can you tell me where the heating element is

Front 15

describe self regulating cable

Back 15

a self regulating polymer that contracts when cold to allow more resistive paths

they can be cut and installed

Front 16

power limiting cables describe

Back 16

a parallel circuit in a cable but they have heating elements made with a alloy with adjusting resistance to temperature

Front 17

read and memorize pg 7

Back 17

review review

Front 18

4 types of heat trace are

Back 18

series

parallel

self regulating

skin affect

Front 19

the 2 types of self regulating cable are

Back 19

self regulating

power limiting

Front 20

the temperature a heat trace needs to sensor is

Back 20

outside temps

surface temps

fluid temps

Front 21

tstats are complex

Back 21

wrong tstats can be simple or complex depending

Front 22

to ways to wire a tstat for heat trace

Back 22

ether in series or with a contactor

Front 23

electronic control is made with and used because?

Back 23

made with solid state switching

its faster and cause less wear

Front 24

a soft start is when

Back 24

is when a controller is used to gradually increase voltage to reduce nuisance tripping

Front 25

review figure 11 on pg 10

Back 25

pg 10

Front 26

review figure 12

Back 26

pg 11

Front 27

what protection for heat trace is to be installed

Back 27

gfci's with higher fault settings then class a gfci's

or a gf alarm when a qualified maintenance worker can fix isusue

Front 28

what are two controls simple tstats cannot handle

Back 28

soft starts and refined specific sensitivity

Front 29

heat trace is installed with

Back 29

fiber tape or metal banding

Front 30

flanges pipe supports and valves need special attention because

Back 30

they can be adjusted or opened so heatrace needs to be removable and they lose more heat so more heat trace is needed

Front 31

review pg 15

Back 31

figure 15