LOTO

Question 1

What is LOTO?

Answer 1

If the unexpected energization or startup of machinery or release of energy source could cause injury, the source must be isolated and controlled.

Question 2

Define control system isolating device

Answer 2

A device that physically prevents activation of a system used for controlling the operation of machinery or equipment

Question 3

Define energy isolating device

Answer 3

A device that physically prevents the transmission or release of an energy source to machinery or equipment

Question 4

Define energy source

Answer 4

Any electrical, mechanical, hydraulic, pneumatic, chemical, thermal, or other source of energy of potential harm to workers.

Question 5

Disconnect must be how close to the unit?

Answer 5

3m ir 10’

Question 6

2 factors to determine braze vs solder

Answer 6

1. Physical properties of metals being joined
2. The demands that will be placed on the connection after it has been formed

Question 7

3 soldering alloy characteristics

Answer 7

1. Melting point = solidus
2. Flow point = liquidus
3. Range of items between = plastic range

Question 8

Tin-lead solders

Answer 8

Used for soldering
Good corrosion resistance
Not recommended for high vib or stress

Question 9

Tin-atimony

Answer 9

Higher in strength that tin-lead, still not recommended for high vib.
Do not use to join brass or galvanized metal

Question 10

Tin-silver solder

Answer 10

Strong connections
Low working temp
Works well to join dissimilar metal
Good elongation when vib is a concern

Question 11

Purpose of flux

Answer 11

Cleans base metal
Removes oxides from filler
Prevents reoxidiation
Aids in capillary flow

Question 12

Behavior of flux

Answer 12

212F, dry out, water boils off
600F, bubble turn white
1100*F, clear liquid
Now apply filler

Question 13

Brazing temp

Answer 13

Above 840*F