Installation Of Exothermic Electrical Connections OQ-0051 installation of exothermic electrical connections

Question 1

All thermit weld charges are limited to a maximum of blank

Answer 1

15 grams

Question 2

Operating at less than 20% SMYS and having a wall thickness equal to or greater than blank

Answer 2

0.100

Question 3

Operating at 20% to 39% SMYS and having a wall thickness equal to or greater than blank

Answer 3

0.156

Question 4

Do not attach wire to ?

Answer 4

Valves
Pressure control fittings

Question 5

Minimum blank apart for multiple connections

Answer 5

6”

Question 6

For the thermit weld procedure where do you refer to?

Answer 6

Operations manual ( corrosion control section 1)

Question 7

What safety PPE is required?

Answer 7

Face shield
Safety glasses
100% cotton clothing
Fr is preferred
Welding or leather gloves
20lb fire extinguisher at location with fire watch
Ear plugs if required

Question 8

Remove the pipe coating in an area approximately blank to blank inches square centered at the point of attachment and and clean the pipe yo a bright, clean surface.

Answer 8

3 to 4 inches

Question 9

How do you achieve a bright clean surface ?

Answer 9

A file or a power grinder with a sanding disc attachment may be used

Question 10

For cathodic test lead wire (12-14 gauge) what do you install?

Answer 10

Install a copper sleeve by crimping it to the end of the lead wire

Question 11

Where do you place the mold over ?

Answer 11

The cleaned pipe surface

Question 12

Where do you insert the conductor through?

Answer 12

The mold cavity

Question 13

What do you cover the tap hole with?

Answer 13

A steel disk

Question 14

Why do you tap the bottom of the cartridge?

Answer 14

To ensure that all the starting powder is emptied

Question 15

True or false- immediately pull the flint gun away to avoid fouling

Answer 15

True

Question 16

How long do you hold the thermit weld mod in place for ?

Answer 16

Approximately 10 seconds while the molten weld metal solidifies

Question 17

How do you test the bond strength ?

Answer 17

You remove the thermit weld mold and test the bond strength by lightly tapping the connection with a brass hammer

Question 18

What do you have to do before making the next weld ?

Answer 18

Clean slag and any moisture from the thermit weld mold before making the next weld

Question 19

The test lead wire should be secured to the pipe blank inches from the connection using tape or plastic tie wire

Answer 19

6 inches

Question 20

What are the 4 methods the conductor connection will be adequately coated with?

Answer 20

Renton weld cover & filler tape as required

Viscotaq weld cover coating patch kit

Viscotaq coating patch (6” x 8” )

Cut to fit Viscotaq pipe coating

Question 21

Is the following an example of a UOC?

Answer 21

Dent, gouge or scratch
Corrosion not leaking
Low cp read