Block 1 - Maintenance of Small Gas Utilities, Disconnection of Equipment Flashcards
Which of the following systems is used to prevent corrosion using low electrical current?
Impressed current systems,
Galvanic anode systems
What may be required to avoid site contamination during removal?
A remedial action plan (RAP)
When removing materials during decommissioning, what must be consulted to ensure safe removal?
Safety Data Sheets (SDS)
What type of welding is used to connect copper conductors to steel pressure piping?
Thermite welding
What should be done with ancillary equipment when decommissioning an appliance?
Isolate and remove it
What must be included in an application for deactivation of a pipeline for 12 months or more?
Reasons for deactivation
What should be done to electrical wires during a temporary appliance disconnection?
Cap the wires properly
What must be done if a gas-fired appliance is found to be beyond repair or unsafe?
Place the appliance out of service and notify a safety officer
What material is typically used as a special backfill to enhance performance of galvanic anodes?
Gypsum,
Bentonite
What is the preferred method of inspecting coating application prior to installation in the ditch?
Holiday detection
Records of the operation and maintenance of corrosion control facilities shall be retained according to:
OCC-1-2013
When is an initial survey for cathodic protection required after piping system installation?
Within 12 months
In impressed current systems, which terminal is connected to the anodes?
Positive terminal
According to B149.1 - 6.12.1, how should an outlet be made tight when an appliance is not connected to a piping system?
By means of a plugged valve or a compatible cap or plug
How often should pipe-to-soil potential surveys be conducted for a short, electrically isolated length of pipe?
Once every 5 years
What should be done when a section of piping is found to be susceptible to stress corrosion cracking?
Conduct an examination for SCC
What does placing an appliance “out of service” mean?
Physically disconnecting both the gas and electrical connections
What is the primary function of an external protective coating?
Isolate reactive material from electrolytes
What regulation is used to establish and implement a process for identifying changes that affect safety, security, or environmental protection?
SOR-99-294
The first line of defense against corrosion for buried or submerged piping is:
Protective coating
If the initial notification regarding unsafe gas equipment is verbal, what must be done next?
A written statement must be promptly provided
What should be done if a pipeline is found to have inadequate cathodic protection?
Apply a new protective coating
What is required if a boiler is being replaced but not permanently removed?
Disconnect water/steam connections and blank and lock out the valves
According to the SOR-99-294, how soon must a company submit a proposed plan if a pipeline’s class location changes to a higher designation?
6 months
Which of the following is not an external direct current source used in impressed current systems?
Capacitors
Which of the following systems does not require an external power source for cathodic protection?
Galvanic anode systems
What frequency is recommended for the inspection and maintenance of all impressed current facilities?
Once per calendar year
Which section of OCC-1-2013 discusses external protective coatings for buried or submerged piping?
Section 3
When an appliance is decommissioned, what must be done with venting and ducting?
Remove and cap them
What should be done with recyclable materials during the removal process?
Check with a local recycling depot for proper disposal
When disconnecting a gas appliance that will not be replaced, which of the following actions is required?
Cap the gas and electrical connections
What material is specified in B.C. Gas Safety Regulations 6.15.19 for use as anodes?
Magnesium
