CETP 4.1 Designing & Installing Exterior Vapor Distribution Systems

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