Mississippi Plumbing
Practice at the real exam's pace
Every practice exam shows your time per question against the real exam's clock (2:34 here), and each topic lands in one of these:
What's on the exam
Questions per topic, out of 70Topics
General Plumbing Regulations
Topic: General Plumbing Regulations
Key Concepts
Installation and prohibited locations - Plumbing systems shall not be located in an elevator shaft or elevator equipment room; floor drains, sumps and sump pumps are permitted at the base of the shaft if indirectly connected and compliant with Section 1003.4 (301.6). - Where this code conflicts with the manufacturer's installation instructions, the more restrictive provisions apply (301.7); where a general and a specific requirement conflict, the specific governs (102.1).
Materials and certification - Plastic pipe, fittings and components shall be third-party certified as conforming to NSF 14 (303.3). - Each length of pipe, fitting, trap, fixture, material and device shall bear the manufacturer's identification and required standard markings (303.1). Cast-iron soil…
Safety
Key Concepts
Confined space definition (§1926.1202). A confined space (1) is large enough and so configured that an employee can bodily enter it; (2) has limited or restricted means for entry and exit; and (3) is not designed for continuous employee occupancy. Examples listed in the note to §1926.1201(a) include manholes (sewer, storm drain, utility), tanks, sewers, lift stations, cesspools, water mains, digesters, and precast manhole units.
Scope and exceptions (§1926.1201). Subpart AA does not apply to construction work regulated by subpart P (Excavations), subpart S (Underground Construction, Caissons, Cofferdams and Compressed Air), or subpart Y (Diving). Where another OSHA standard addresses a confined space hazard, the employer must comply with both that requirement and the applicable provisions of…
Cleanouts
Key Concepts
Placement intervals - Horizontal drainage pipes within buildings shall have cleanouts at intervals of not more than 100 feet (Section 708.1.1). - Exception: horizontal fixture drain piping serving a nonremovable trap is not required to have a cleanout for the section of piping between the trap and the vent connection for that trap (Section 708.1.1, Exception). - Building sewers smaller than 8 inches require cleanouts at intervals of not more than 100 feet (Section 708.1.2). - Building sewers 8 inches and larger require a manhole not more than 200 feet from the junction of the building drain and building sewer, and at intervals of not more than 400 feet thereafter (Section 708.1.2). - Cleanouts on building sewers…
Fixtures and Equipment
Mississippi Plumbing Exam | 5 questions (7%)
Key Concepts
Prohibited fixtures (IPC Section 401.2) - Water closets having a concealed trap seal or an unventilated space, or having walls that are not thoroughly washed at each discharge in accordance with ASME A112.19.2/CSA B45.1, are prohibited. - Any water closet that permits siphonage of the contents of the bowl back into the tank is prohibited. - Trough urinals shall be prohibited. Wall-hung, stall, and blowout urinals are not prohibited by this section.
Fixture materials (IPC Section 402) - Fixtures shall be of approved materials with smooth, impervious surfaces, free from defects and concealed fouling surfaces (402.1). Porcelain enameled surfaces shall be acid resistant. - Sheet copper for general applications: conform…
Water Heaters
Key Concepts
Scope and general requirements (Section 501) - Chapter 5 governs the materials, design and installation of water heaters and related safety devices and appurtenances (Section 501.1). - Where a combination potable water heating and space heating system requires water for space heating above 140°F (60°C), a temperature-actuated mixing valve complying with ASSE 1017 must limit water supplied to the potable hot water distribution system to 140°F (60°C) or less (Section 501.2). - Drain valves for emptying shall be installed at the bottom of each tank-type water heater and hot water storage tank. The drain valve inlet shall be not less than 3/4-inch (19 mm) nominal iron pipe size, and the outlet shall have male garden hose threads…
Piping, valves, controls
Mississippi Plumbing Exam | 3 questions (4% of exam)
Key Concepts
Water service sizing and pressure ratings - The water service pipe shall be not less than 3/4 inch (19.1 mm) in diameter, regardless of fixture unit demand (IPC Section 603.1). - Water service pipe or tubing installed underground and outside the structure must have a working pressure rating of not less than 160 psi at 73.4°F; where pressure exceeds 160 psi, the material must be rated for the highest available pressure (IPC Section 605.3). - Hot water distribution pipe and tubing must have a pressure rating of not less than 100 psi at 180°F (IPC Section 605.4).
Water Supply
Mississippi Plumbing Exam · 6 questions (9%)
Key Concepts
Backflow prevention — devices and applications - Barometric loop: shall precede the point of connection and extend vertically to a height of 35 feet (10,668 mm) — Section 608.14.4. - Pressure vacuum breaker assembly: backsiphonage protection only; critical level installed not less than 12 inches above all downstream piping and outlets — Section 608.14.5. Double check and reduced pressure principle assemblies protect against both backpressure and backsiphonage. - Fire sprinkler systems with chemical additives or antifreeze: potable supply must be protected by a reduced pressure principle backflow prevention assembly or a reduced pressure principle fire protection backflow prevention assembly — Section 608.17.4.1. - Lawn irrigation with chemicals introduced: **reduced pressure…
Hangers and Supports
Key Concepts
- General. Plumbing piping shall be supported in accordance with Section 308 (Section 308.1).
- Seismic supports. Where earthquake loads are applicable in accordance with the International Building Code, plumbing piping supports, anchorage, and bracing shall be designed and installed for seismic forces in accordance with Chapter 16 of the International Building Code (Section 308.2).
- Materials. Hangers, anchors and supports shall support the piping and the contents of the piping. Hangers and strapping material shall be of approved material that will not promote galvanic action (Section 308.3).
- Structural attachment. Hangers and anchors shall be attached to the building construction in an approved manner (Section 308.4).
- Interval of support. Pipe shall be supported in accordance…
Drain, Waste, and Vent
15 questions, 21% of the exam
Key Concepts
Slope of horizontal drainage piping (IPC Table 704.1) - 2½ inches or less: ¼ inch per foot - 3 to 6 inches: ⅛ inch per foot - 8 inches or larger: 1/16 inch per foot - Piping upstream of a grease interceptor: not less than ¼ inch per foot (2-percent slope), regardless of pipe size (Section 704.1).
Connections to bases of stacks (Section 704.3). Horizontal branches shall connect to the bases of stacks not less than 10 times the diameter of the drainage stack downstream from the stack.
Backflow
Key Concepts
Definitions (IPC 2021, Section 202) - Backflow: Pressure created by any means in the water distribution system which, by being in excess of the pressure in the water supply mains, causes a potential backflow condition. - Backflow, water supply system: The flow of water or other liquids, mixtures or substances into the distribution pipes of a potable water supply from any source except the intended source. - Backsiphonage: The backflow of potentially contaminated water into the potable water system as a result of the pressure in the potable water system falling below atmospheric pressure of the plumbing fixtures, pools, tanks or vats connected to the potable water distribution piping. - Backpressure, low head: A pressure **less than…
Traps and Interceptors
Key Concepts
Fixture traps (IPC 1002.1, Page 10 / p. 103). Each plumbing fixture shall be separately trapped by a liquid-seal trap. The vertical distance from the fixture outlet to the trap weir shall not exceed 24 inches (610 mm); the horizontal distance shall not exceed 30 inches, measured from the centerline of the fixture outlet to the centerline of the trap inlet. A fixture shall not be double trapped. Clothes washer standpipe height above a trap conforms to Section 802.4.3. Exceptions: integral traps; a combination plumbing fixture on one trap where one compartment is not more than 6 inches deeper than the other and waste outlets are not more than 30 inches apart; certain multilevel parking structure floor…
Developed length
Key Concepts
Cleanout spacing on horizontal drainage piping. Horizontal drainage pipes within a building shall have cleanouts at intervals of not more than 100 feet, measured along the developed length of the piping from the cleanout opening to the next drainage fitting providing access for cleaning, the end of the horizontal drain, or the end of the building drain (IPC 2021, Section 708.1.1).
Cleanouts on building sewers. Building sewers smaller than 8 inches require cleanouts at intervals not exceeding 100 feet of developed length. Manholes at 400-foot intervals apply only to sewers 8 inches and larger (IPC 2021, Section 708.1.2).
Isometric Analysis
Mississippi Plumbing Exam — 12 questions (17%)
Key Concepts
- Pipe is drawn on its centerline. On the drawing, pipe is shown by its centerline only and fittings are shown by hash marks across the pipe (Unit 8, Allowance for Threaded Fittings). Pipe length is measured along the centerlines; where two centerlines cross there is a center point located inside a fitting, and the pipe is cut to an end-to-end length that is shorter than the center-to-center measurement.
- Fitting allowance. The allowance for a given fitting is the distance between the end of the pipe (which is inside the fitting) and the center of the fitting. End-to-end is always shorter than center-to-center because the pipe does not thread…
Joints and Connections
Key Concepts
Fittings and flow (applies to all joint types) - Pipe fittings "shall not have ledges, shoulders or reductions capable of retarding or obstructing flow in the piping," and threaded drainage pipe fittings "shall be of the recessed drainage type" — IPC 2021 Sections 706.2 and 1102.7 (IPC 2021, Page 11-2). - Pipe fittings shall be approved for installation with the piping material installed and comply with the applicable standards listed in Table 702.4 (Section 702.4). Connections and changes in direction in storm drainage shall use approved drainage-type fittings per Table 706.3 and shall not obstruct or retard flow (Section 1101.6). - Where this code and the manufacturer's installation instructions conflict, the more restrictive provisions apply (Section 301.7).…