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CETP 4.1 Designing & Installing Exterior Vapor Distribution Systems Exam 2024 Questions and Answers
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CETP 4.1 Designing & Installing Exterior Vapor Distribution Systems Exam
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CETP 4.1 Designing & Installing Exterior Vapor Distribution Systems Exam_____________ is the sum of the rated btu/hr input for each propane appliance connected to the vapor distribution system. - Answer- Total gas demand
Where do you record the ratings of the btu/hr input for a customers current appliances? - Answer- Customer gas appliance use profile form
_____________ is used to determine the amount of propane required to operate appliances at a reduced demand, and assumes full cycle happen typically, and don't operate simultaneously. - Answer- Effective system load
Most critical issues when selecting a container: - Answer- Customer's propane demand,
above or underground, and vaporization.
When a container is sized for vapor service, the goal is to ensure the _________________ is higher than the demand of propane. - Answer- Vaporization rate
when selecting/sizing a tank, it's important to consider if it will be ________________ or
______________. - Answer- Above ground, underground
For underground tanks, it's important to consider __________ and ______________ - Answer- Soil temperature, frost penetration
When sizing a container, it is important to consider the most lite conditions the container
will operate in. T/F? - Answer- False
When determining container size, the temperature used for tank sizing should be the lowest temperature anticipated. T/F? - Answer- True
NFPA 58 states all containers installed/filled at a customers home must be ___ ft in any direction from combustibles. - Answer- 10
NFPA 58 states all containers installed/filled at a customers home must be ___ ft in any direction from an above ground tank/ flammable liquid. - Answer- 20
NFPA 58 states all containers filled on site must be positioned so the fill connection, relief valve, and liquid level gauge vent are ___ ft from sources of ignition. - Answer- 10 For DOT cylinders, 500+ gallons of total water capacity on a customers property must be ___ ft or further from building. - Answer- 25
Above ground tanks with less than 125g water capacity may be placed next to a building and must be ___ ft away from any discharge. - Answer- 5
_________________ are the most common method used to join steel and wrought iron pipes in residential/small commercial installs. - Answer- Threaded fittings
Acceptable types of fittings include: - Answer- Steel, malleable iron, ductile iron, press-
connect
____________ can be joined using manufacturer prescribed procedures like heat fusion, or mechanical fittings. - Answer- Polyethylene (PE) pipe
For underground installs, tracer wire ________ be in direct contact with the PE pipe. Must also be ___ AWG (american wire gauge). - Answer- cannot, 14
________ is flexible, durable, and covered with a plastic sheath. The sheath should be protected as much as possible to prevent corrosion. - Answer- CSST (Corrugated Stainless Steel Tubing)
When sizing pipe/tubing for multiple second stage regulators, the line from the first stage regulator to the second stage regulator must be sized based on the total btu/hr demand beyond any/all second stage regulators. T/F? - Answer- True
Primary factors affecting the rate of corrosion are: - Answer- Type of metal, environment
metal is exposed to
Methods used to protect propane containers/metallic piping from corrosion: - Answer- Paints/protective coatings, cathodic protection, electrically insulating fittings
_______ is most corrosive when it is high in moisture, electrical conductivity, acidity, and dissolved salts. - Answer- Soil
Regulator selection is based on _____________ and _____________. - Answer- Downstream gas demand, service requirements
More regualators in the system help increase effiencey. T/F? - Answer- True
All fixed piping systems that serve 1/2 psig appliance systems are required to use a ____________, an ______________, or ______________. - Answer- 2-stage regulator system, integral 2 - stage regualtor, 2-psi regulator system
When the service valve to a container is closed: - Answer- the regulator spring has forced the diaphram down, fully opening the regualtor orifice
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