Propane Dispenser Installation and Maintenance Guidelines, Exams of Nursing

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CETP 5.1 Designing & Installing

Dispenser Transfer Systems fully solved

Determining the ______________________ and a good estimate of the volume of propane usage on a weekly basis will lead to a better dispenser design, install will avoid poor planning and cost. - correct answer ✔✔Types of propane containers that will be serviced Designing and installing a propane dispenser requires a clear determination of the functions ___________________. - correct answer ✔✔The installation will serve A dispenser install ________________ and discuss with the _______________ is the first step in designing/installing the dispenser. - correct answer ✔✔Site inspection, dispenser operator Propane dispensing stations typically use one ________________. - correct answer ✔✔ASME stationary tank NFPA 58 limits the maximum aggerate water capacity for tanks supplying dispensing stations not located in a bulk plant or industrial plant no more than ________________ gallons. - correct answer ✔✔30, Containers shall be self-supported and be desgined to withstand the ____________________ forces and hydrostatic test loads anticipated at the site. - correct answer ✔✔Wind, seismic, earthquake Compliance with NFPA 58 vertical tank install provisions generally are: - correct answer ✔✔- consulting w/ tank manufacturer & follow their instructions

• knowing the location/environment
• consulting with AHJ during pre install Planning and installation of electrical service to a porpane dispenser should be coordinated with the _________________ or _______________. - correct answer ✔✔installation site owner, licensed electrical contractor

The 25ft distance from aboveground ASME containers of 501 to 2,000 gallons WC to buildings, group of buildings, or the line of a adjourning property that can be built upon shall be reduced to ___ ft for a single ASME container of 1,200 gallons WC or less. - correct answer ✔✔ 10 An ASME container 1200 gallons WC or less must be at least __ ft from any other LP-gas container of more than 125 gallons WC. - correct answer ✔✔ 25 Propane dispensers located at multiple fuel refueling stations shall comply with ______________. - correct answer ✔✔NFPA 30A Containers of 125-4,000 gallons WC shall be provided with an ______________________with a connection not smaller % in. national pipe thread. - correct answer ✔✔actuated liquid withdrawl excess flow valve Dispenser tank valves and fittings that are optional or not specifically required but may be required by local or state authorities include: - correct answer ✔✔- Backflow check & excess-flow vapor reutrn valves

• Manual shutoff liquid valve w/ internal excess-flow check valve
• Pressure gauge Liquid withdrawl openings in new installations shall be equipped with an internal valve that is fitted for remote closure and automatic shutoff using thermal (fire) actuation where the thermal element is located withing __ ft of the internal vavle. - correct answer ✔✔ 5 For propane, the relief valve's start to discharge pressure is ____________. - correct answer ✔✔250 psig Relief valves for dispenser supply tanks must meet the requirments set out in _______________. - correct answer ✔✔NFPA 58 Pressure relief valve discharge on underground containers of more than 2,000 gallons WC shall be piped vertically and directly upward to point as least __ ft above ground. - correct answer ✔✔ 7

Pressure relief devices installed in underground containers in dispensing stations shall be pipe vertically upward and point at least __ ft above ground. - correct answer ✔✔ 10 ______________ are designed to remian in place and minimize any entrance of water or other matter into the relieve valve or discharge piping. - correct answer ✔✔Rain caps Dispenser supply tanks over 4,000 gallons WC or having a filling opening diameter ____ inch or larger require a transfer bulkhead equipped with an emergency shutdown valve (ESV) for the vapor equalizing connection, (if ___ inch or larger) and an ESV for the liquid fill connecton. - correct answer ✔✔1 1/2, 1 1/ For supply tanks not located in a bulk or industrial plant having WC of 4,000 gallons or less a __________ shutoff valve must be provided in conjunction with the internal excess flow. - correct answer ✔✔positive Internal valves can be fitted with _______ or ____________________ as apart of an emergency shutdwon system. - correct answer ✔✔cable, pneumatic actuators Horizontal dispenser tanks are typically fitted with a single top mounted _________________. - correct answer ✔✔float gauge ASME tanks larger than 1,200 gallons WC must be fitted with a ________________ and a ________________. - correct answer ✔✔pressure gauge, temperature gauge An ASME tank's _______________ is used to determine the the discharge capacity requirements for it's relief valve. Appears on tank data plate. - correct answer ✔✔surface area in square feet NFPA 58 allows for various materials and piping joints (threaded and welded) to be used in respect to liquid piping in dispenser stations, one type of piping that cannot be used is ___________. - correct answer ✔✔plastic Electrical equipment and wiring installed in an unclassified areas shall be in accordance with _____________. - correct answer ✔✔NFPA 70

NFPA 58 and NEC specify the electrical system within __ ft of the dispenser pump must meet the requirements from an explosion proof electrical system. - correct answer ✔✔ 15 The electrical equipment used in classified areas of a propane install must be approved for NEC __________________ division 1 or 2. - correct answer ✔✔Class I, Group D Primary components of a dispenser electrical system are: - correct answer ✔✔explosion-proof motor for the pump, metal conduit for wiring, one or more flex connectors, switch enclosure, wiring junction boxes, sealing fitting within 18" of a spark producing device. Most dispensers use a 5 ________________ explosion proof motor driven pump. - correct answer ✔✔horsepower _____________ in electrical area classifications are based upon the likelihood of the prescence of a flammable mixture of materials in an area. - correct answer ✔✔Divisions Selecting the pump for a propane dispenser should include a complete understanding of how the dispenser will be _____________ and the functions that the dispenser must fulfill. - correct answer ✔✔operating _________________________ are suitable for typical dispenser isntalls and will provide adequate transfer volume for filling portable cylinders, motor fuel cylinders, and vehicle mounted ASME tanks mobile/fuel tanks. - correct answer ✔✔Regenerative turbine pumps _____________________ is the difference between the pressure at the outlet side of the pump, and the pressure at the inlet side of the pump. - correct answer ✔✔Differential pressure Usually dispenser pumps and motors are selected as a single unit supplied by the manufacturer or _______________________. - correct answer ✔✔propane equipment distributor Three factors used to verify explosion proof motor: - correct answer ✔✔- pumps horsepower and rpms

• available electrical power supply
• motor frame style required

Whenever a new or replacement bypass valve is installed, it must be adjusted to the proper differential pressure. T/F? - correct answer ✔✔True For LP-gas installations, a maximum differential of _________ is allowed by NFPA 58 and UL Inc. - correct answer ✔✔125 psig You are allowed to adjust a bypass valve higher than LP-gas code allows. T/F? - correct answer ✔✔False The main consideration in selecting a pump to fill small cylinders is to pick a pump with minimal gallons per minute to minimize risk of ___________________. - correct answer ✔✔overfilling cylinders Flex connectors should be installed as straight as possible, and should never be used in place of pipe fittings to make flexes or bends. T/F? - correct answer ✔✔True The pump should be protected by the installation of an inline strainer upstream of the pump inlet; pump manufacturer IOM instructions give _____________ for protecting the pump from debris. - correct answer ✔✔strainer screen size specifications If the power supply at the site will only support low voltage, single phase electric motors, the pump size and volume must be matched to the _________________. - correct answer ✔✔limitations of the power supply A remote emergency shutoff device is required not less than __ ft, but no more than ____ ft from transfer point. - correct answer ✔✔3, 100 Each bulk plant, industrial plant, or distributing point shall be provided with at least one approved portable fire extinguisher with a rating of ___________________. - correct answer ✔✔18 B:C To comply w/ NFPA 58, a pump operating ______________ shall be located near the dispenser pump. - correct answer ✔✔control or disconnect switch

For every dispenser transfer hose application, a quick-acting _______________ is a code requirement. - correct answer ✔✔hose-end valve Hose length should not exceed ___ft unless approved by AHJ. - correct answer ✔✔ 18 Hose shall be designed for a working pressure of __________ with a safety factor of _________, and shall be marked LP-GAS, PROPANE, ____ PSI WORKING PRESSURE, and manufacturer name/trademark. - correct answer ✔✔350 psig, 5 to 1, 350 NFPA 58 requires that hose assemblies shall be leak tested _______________, at not less than ____________________. - correct answer ✔✔at time of installation, 120 times normal operating pressure A ______________ or a differential back pressure valve shall be installed in or on the dispenser at the point which the dispenser hose is connected to the liquid piping. - correct answer ✔✔excess flow check valve NFPA 58 requires a ______________ or other device providing pressure relieving protection shall be installed in each section of piping and hose in which liquid LP-gas can be isolated between shutoff valves.

• correct answer ✔✔hydrostatic relief valve __________________ scales are most frequently selected for their simplicity and durability. - correct answer ✔✔Single-beam style Installer-fabricated and assembled support system must not involve ______________, unless the installer has an ASME tank code certification. - correct answer ✔✔welding on the ASME tank Typical dispenser scales have 1,000 pound ratings; minimum counter poise weights up to _____ pounds.
• correct answer ✔✔ 200 One of the typical requirements of weights and measures authorities for propane liquid meters used in the sale of propane sold by volume is that the meter be equiped with a _____________. - correct answer ✔✔temperature compensator

Selection of the __________ for the specific customer application is important because of the selection may determine if the installation is a good investment or a losing buisness venture. - correct answer ✔✔appropriate equipment and dispenser type NFPA 58 requires that dispensers must be installed according to _____________. - correct answer ✔✔manufactuer installation instructions According to NFPA 58propane dispensers must be seperated from other fuel dispensing stations by at least __________. - correct answer ✔✔10 feet Most states weights and measures authorities require liquid meters to be _______________ on a periodic basis. - correct answer ✔✔recalibrated or "proven" A liquid meter will over register any time there is vapor in the __________. - correct answer ✔✔measuring chamber Never attempt to bleed down a meter _______________; doing so reduces the pressure only in the hose, not the meter. - correct answer ✔✔solely by opening the hose end valve on the delivery hose Components of propane liquid meter: - correct answer ✔✔register, vapor eliminator, measuring chamber, differential valve, temperature compensator Motor fuel dispensing units at multi-fuel refueling stations must be installed on _____________. - correct answer ✔✔raised concrete foundations Buried metalic propane piping should be coated or protected and maintained to _____________. - correct answer ✔✔minimize corrosion To meet NFPA 58 standards, dispenser piping, including hoses, must be tested for leakage at the time of installation at ________ pressure - correct answer ✔✔normal operating

Either a fire safety analysis or a written product release prevention and incident preparedness review must be prepared and submitted to ________________. - correct answer ✔✔the AHJ and local emergency responders The requirements of NFPA 58 regarding _________________ requirements for instllations over 4, gallons WC must be met. - correct answer ✔✔the effective date of adoption of NFPA 58, 2004 edition Existing ASME tank installations with WC in excess of 4,000 gallons installed prior to the effective date of the 2001 edition of NFPA 58, and that were not equipped for automatic shutoff using thermal activation and remote emergency shutdown, must be provided such protection by _______________. - correct answer ✔✔July 1, 2011 Propane liquid meters may be equipped with temperature compensators that sense the temperature of the product and automatically correct the volume measured by the meter to the __________________.

• correct answer ✔✔equivalent volume @ 60 degrees F When there is no change in the register reading when liquid propane is flowing the first meter component to check is the ______________ for movement. If movement is seen, the _______ must be repaired or replaced. - correct answer ✔✔final stage of gear train, register If the vapor eliminator or differential valve fails, it is usually the result of: - correct answer ✔✔- torn diaphragm
• worn out valve
• damaged valve seat Propane operating personnel should promptly report and/or correct any of these meter abnormal operating conditions: - correct answer ✔✔- erratic opperation
• over/under registering
• noisy
• slow delivery rates Propane dispensing stations should be at least ___ ft away from from any tank. - correct answer ✔✔ 20

Types of vehicular traffic protection from propane dispensing stations include: - correct answer ✔✔- concrete steel crash posts

• chain link wire mesh fence
• substantial guard rail w/ post barricades
• reinforced concrete barriers