Under NFPA 30 (2018), a liquid is classified as a Class I flammable liquid when its closed-cup flash point is:
Gas Piping
Question · Easy
Never enter a tank before testing the air
Short
Unless tested to ASME B31, NFPA 30 (2018) requires flammable- and combustible-liquid piping to be hydrostatically tested, before being covered or placed in use, to what percentage of the maximum anticipated system pressure?
Underground metallic piping that handles flammable or combustible liquids must be protected from external corrosion by which of the following methods?
Trades Exam Prep Podcast
Listen on Spotify
Podcast
When nonmetallic (plastic) gas pipe is installed underground, what locating aid is typically installed with the pipe so it can be found later?
Under the APWA Uniform Color Code used with Nevada 811 marks, which color identifies gas, oil, steam, or other gaseous materials?
Per NFPA 30, joints in piping systems that handle Class I liquids and are located in concealed spaces within buildings shall be:
When must NFPA 30 piping that will be buried be tightness-tested?
ASME B31.8 location class for a gas pipeline is assigned primarily on the basis of:
A contractor elects to pneumatically test an NFPA 30 product line whose maximum anticipated pressure is 40 psi. What is the correct pneumatic test pressure and minimum hold time?
Question · Medium
Under NFPA 30 (2018), a combustible liquid with a closed-cup flash point of 125°F is classified as:
What minimum cover does NFPA 30 typically require over an underground storage tank, unless a concrete slab option is used?
On a coated steel underground product line with sacrificial-anode cathodic protection, dielectric fittings are installed primarily to:
When a polyethylene gas main must be temporarily shut off in the field, the accepted method is to:
A holiday test on a newly coated steel gas or product pipeline is performed to:
In gas transmission and distribution practice, MAOP means:
As ASME B31.8 location class increases from a rural Class 1 area to a densely built Class 4 area, the design factor used in the hoop-stress formula:
A heat-fusion joint in polyethylene gas pipe is acceptable only when:
Warning tape over a buried gas line is installed for what purpose?
ASME B31.8, the reference used to prepare Nevada A-19 gas-piping questions, applies to which of the following?
A new 8-inch inside-diameter gas line is 500 feet long. Using gallons = 0.0408 × d² × L (d in inches, L in feet), about how many gallons of water are needed to fill the pipe for a hydrostatic test?
An NFPA 30 product line has a maximum anticipated pressure of 80 psi. What are the correct NFPA 30 initial test pressures if the line is tested hydrostatically and, alternatively, pneumatically?
Question · Hard
Under NFPA 30, gasoline with a flash point below 73°F and a boiling point above 100°F is which Class I subclass?
NFPA 30 requires vent piping for underground tanks storing Class I liquids to terminate at least how high above adjacent ground level?
In ASME B31.8 hoop-stress design, which pair correctly matches location class to design factor?
A gas-piping offset uses two 45-degree fittings and a 16-inch offset distance. What is the travel (center-to-center length of the offset pipe)? Use travel = offset × 1.414.
What is the primary purpose of pipe bedding under a ductile-iron water main?
Water Piping
Which joint is most commonly used for straight runs of buried ductile-iron water pipe?
In corrosive soils, DIPRA and AWWA C105 recommend protecting ductile-iron pipe with:
Unbalanced thrust in a pressurized water main must be restrained at which of the following locations?
ANSI/AWWA C600 warns that newly installed buried ductile-iron water mains should be strength-tested with which medium?
The cement-mortar lining inside ductile-iron water pipe is provided primarily to:
Under the APWA Uniform Color Code, which color marks potable water?
Haunching of a buried water pipe means:
ANSI/AWWA C600 requires the hydrostatic test pressure on a ductile-iron water main to be at least:
When a concrete thrust block is poured behind a mechanical-joint fitting, the joint bolts and glands should be:
Unless the engineer specifies otherwise, DIPRA guidance for concrete thrust blocks calls for a minimum 28-day compressive strength and a minimum cure before pressure testing of about:
When assembling a push-on ductile-iron joint, the spigot should be inserted until:
Which statement about polyethylene encasement of ductile-iron pipe is correct?
When a water main must change direction slightly to miss an obstruction, DIPRA prefers that the crew:
After a new potable-water main is installed and pressure-tested, it must be disinfected, typically to AWWA C651, before it is placed in service. The purpose of that step is to:
Suggested trench width for ductile-iron pipe is generally:
A restrained joint on a ductile-iron water main is used primarily to:
If polyethylene encasement is torn during installation, the correct action before backfill is to:
Before a hydrostatic test is started on a new water main, the line should be:
In AWWA C600, the “testing allowance” (makeup water) is best described as:
A ductile-iron water main has a stated working pressure of 120 psi. Using AWWA C600, what are the minimum test pressures at the highest and lowest points of the test section?
Loading more…