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