ABYC Systems Certification Exam Review(SCORED A+)

Polyethylene - ANSWER What is the most often used materials for potable water systems? 1. Copper Alloys (incl. bronze, brass and nickel-copper) 2. AISI Type 300 series stainless steel 3. Glass-lined metal 4. FDA approved plastic 5. FDA approved rubber - ANSWER Name 5 materials allowable for contact use in potable water systems: Siphon Break - ANSWER What device can be used to separate potable water from other water systems? Accumulator Tank, after pump/filter and before check-valve - ANSWER What is the device used to maintain a stable pressure and minimize pump cycling, and where should it be located? 175% - ANSWER At what what percentage of nominal working pressure shall the relief valve be set? No, typically these are too high (up to 400% of nominal pressure) - ANSWER Is a standard household type relief valve acceptable for hot water tanks? nominal working pressure, not to exceed 80 PSI - ANSWER For the pressure reducing valve and check valve installed after a shore water connection, what is the maximum allowable pressure? overboard - ANSWER Where shall the storage tank be vented? 3 PSI or mnfg's maximum, which ever is greater. - ANSWER What is the maximum allowable pressure to which the storage tank and vent system be subjected? -40 °F to +140 °F - ANSWER What temperate range is required for pumps to be able to tolerate exposure? 257 F - ANSWER When operating at an ambient temperature of 140 F, what is the max allowable surface temperature of a pump? True - ANSWER Potable water systems must be equipped with a drain. T or F? False - ANSWER Storage tank inlet may also serve as the tank vent. T or F? True - ANSWER Storage tank inlet caps must be retained to prevent loss. T or F? True - ANSWER Storage tanks must be equipped with a vent. T or F? True - ANSWER Storage tank vent may be used for filling purposes. T or F? At least 1.5X the pressure exerted by the distance from the tank bottom to the deck fill plate or vent, but not less than 3 PSI. - ANSWER What rate of static pressure must a storage tank withstand? 3 PSI - ANSWER What is the max pressure that a desalinator can impart to a storage tank? True - ANSWER Each desalinator must be equipped with an automatic shutoff salinity detector. T or F? "For Cold Water Use Only" - ANSWER What marking must be on pipe or tubes that are not capable of handling hot water? 125 PSI, 300 PSI - ANSWER What is the test pressure for water heater tank 15 gal or less? over 15 gal but under 120 gal? 175 PSI - ANSWER What is the max pressure relief valve setting for hot water tanks? 210 F - ANSWER What is the max temperature relief setting for hot water tanks? 125 F - ANSWER What is the max allowable water output temperature for hot water system? True - ANSWER All potable water system connections shall be positioned above the normal bilge water accumulation level. T or F? True - ANSWER Exposed metallic parts of a potable water system shall have provisions for electrical bonding. T or F? Improper venting - ANSWER For what reason might a holding tank collapse during pump-out? Type I - ANSWER What type of MSD (Marine Sanitation Device) discharges effluent with fecal coliform bacteria count = 1,000 (per 100 ml) and no suspended solids? Type II - ANSWER What type of MSD (Marine Sanitation Device) discharges effluent with fecal coliform bacteria count = 200 (per 100 ml) and = 150 mg suspended solids per liter? Type III - ANSWER What type of MSD (Marine Sanitation Device) is designed to hold sewage or any waste derived from sewage? Retention System - ANSWER What is the name given to the complete system including toilets, hoses, pipes, holding tanks and fittings designed to receive, retain, vent and pump out sewage? Treatment System - ANSWER What is the name of the system that includes all sanitation equipment and fittings designed to receive, treat, vent and discharge sewage? Siphon break - ANSWER What is another name for a vented loop that prevents back siphoning by breaking suction yet allowing normal flow when pressurized? 5 - ANSWER When calculating holding tank size, how many flushes per day are included in the calculation? 0.14 gallons - ANSWER What volume of human waste is used per flush when calculating holding tank size? True - ANSWER True or False: If a portable toilet is secured and fitted with a deck pump-out fitting and vent it qualifies as a type III device. Prevention of siphoning - ANSWER Why must careful consideration be given to the location and routing of inlet and discharge lines for manual flush toilets when the "shut-off" merely bleeds air into the inlet line? Whenever components are installed below the max heeled water line - to prevent back flow into the vessel or unintentional siphoning of untreated effluent overboard. - ANSWER When and why must siphon breaks be installed in a sewage system? True - ANSWER A seacock may be installed instead of a siphon break to prevent discharge and back siphoning. T or F? The handle must be lockable in the direction of the holding tank - ANSWER What special provision must be included for a sewage y-valve when the discharge seacock is not lockable? Air Gap, Vacuum Break, Double Check Valve, Dedicated Water Tank - ANSWER Name four ways to separate a fresh water flushing system from potable water system. 1.5 inches - ANSWER What is the minimum hose ID for use on un-macerated sewage? Secure mounting to minimize vibration effect, use flexible hose to connect to fitting and hull. - ANSWER What provisions should be made if using rigid PVC for sewage? linear or cross-linked polyethylene, 1/4 inch thick or greater. - ANSWER What plastic material is recommended for sewage holding tanks? Epoxy and Vinyl Esther are ok, but polyester resin is not because of susceptibility to osmotic blistering. - ANSWER Of the three major type of Fiberglass Reinforced Plastic (FRP), which one is not recommended and why? 5/8 inch - ANSWER A removable holding tank's vent line shall be what minimum diameter? 8 lbs - ANSWER What is the approximate weight of a gallon of sewage?