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Nicet Level 1 - Water Based Layout Exam
(100 out of 100) Questions and Answers
(LATEST Update)
Toggle hangers shall be permitted only for the support of pipe __________ inches or smaller in size under ceilings of hollow tile or metal lath and plaster. 1 2/2 in. (ref. NFPA 13 2016 Sec. 9.2.1.1.2. While conducting a flow test, the chosen hydrant should be ______ As close to the property where the sprinkler system is being installed. (Ref, NFPA 13 Sec. A.24.2.2. or NFPA 291) What formula is used to determine the discharge coefficiant relating pressure and flow rate? K = Q / (Square root of P) What best describes a tree system? Cross mains and the branch lines are not tied together, providing only one path of water flow. Factors that define Occupancy Group Hazard 2 include: Quantity and combustibility of contents are moderate to high. Stockpiles of contents with moderate rates of heat release do not exceed 12 ft and stockpiles with high heat release do not exceed 8 ft
(Ref NFPA 13 Sec. 5.3.2) Which of the following standards contain reqs. pertaining to the installation of underground piping? NFPA 13 & 24 (Both in Chapter 10) Which of the following should you inspect on an extension cord before each use? The grounding prong & the insulation for nicks, cuts, or damage ________ indicates a mandatory req. according to NFPA definitions. Shall. (Ref. NFPA 13 2016, Sec. 3.2.4.) 100 GPM is flowing through 100' of 1 1/4 in. Sch. 40 pipe. How many feet of 1 1/2 in. pipe will produce the same friction loss? Assume this is Schedule 40 pipe, C = 120. Use the Hazen-Williams formula to calculate the friction loss for the 1 ¼ in. pipe and the 1 ½ in. pipe. For 1 ¼ in. pipe (ID = 1.38): P friction loss = 4.52 x Q 1. c 1.85 x d 4.
y ft. x 0.317 psi/ft = 67.2 psi y = 67.2 ÷ 0. y = 212 ft. A basic contract: (choose all that apply) Contains the names of the parties involved, References the contract documents, Discusses the work that is to be done, and Discusses start and completion dates. Define both the constant, y, and the exponent ,z, for q in the Hazen-Williams friction loss formula shown Below: P = L x (y x Q^z) (c^1.85 x d^4.87) 4.52, 1.85. Reference NFPA 13 2016 Section 23.4.2.1.1. A water flow test was conducted using 1 hydrant, flowing with two 2 1/2 inch outlets. Which is the approximate water flow rate, if the pitot reading was 15 psi. The hydrant outlet coefficiant is 0.8. The correct answer is 1156 gpm. Solution #12:
Q 1 = 29.84 cd 2 √ P Q 1 = 29.84 x 0.8 x (2.5) 2 x √ Q 1 = 577.8 gpm Both outlets are 2 ½ in., with the same outlet coefficient. Therefore, Q 1 = Q 2 The total flow rate is then: Q 1 + Q 2 = Q total Q total = 577.85 gpm + 577.85 gpm = 1155.70 gpm, round up to 1156 gpm If a cross main in a ________ pipe sprinkler system has three branch lines per bay, one intermediate hanger shall be permitted to be omitted, if a branch line hanger is installed on the starter peice. Steel. Reference NFPA 13 2016, Section 9.2.4.3. NFPA 13 specifies the depth of cover fro underground pipe of a minimum of 2 1/2 ft, 3 ft. under driveways and 4 ft. under railroads tracks. However, it must be at least 1ft. below the frost line. If the frost line is 2 1/2 ft, what is the minimum depth of cover under a driveway?
Reference NFPA 13 2016, Figure A.23.1(b). Where the suction supply is under sufficient pressure to be of material value without the pump, the pump shall be installed with a _________, which shall be at least as large as the pipe size required for the discharge pipe. Bypass. Reference NFPA 20 2016, Section 4.15.4. What is the temp. class and color code for a sprinkler located at a ceiling w/ a max temp of 150 degrees? Intermediate, white. Reference NFPA 13 2016, Table 6.2.5.1. When conducting a hydrostatic flow test for a new fire sprinkler system, the test pressure should be _______ psi for ________ hours. 200, 2. Reference NFPA 13 2016, Section 25.2.1.1. Supplementary conditions of a contract contain which of the following: Delay agreements, Time and pay schedules, and Addendums. Reference course content.
Copper tube that has the greatest (largest0 inside diameter for 1 inch. nominal tube is: Type M. Reference NFPA 13 2016, Table A.6.3.5. Calculate the equivalent length of 4 in. Schedule 40 Black steel pipe of a 90 degree long turn elbow 6 ft. Per NFPA 13 2016, Table 23.4.3.1.1, we find the equivalent length for a 4 in. Schedule 40 Black steel pipe with a 90 0 long-turn elbow is 6 ft. Determine the maximum spacing permitted for an Extra Hazard hydraulically calculated system with a density less than 0.25 gpm/ft^ 15 ft. Reference NFPA 13 2016, Table 8.6.2.2.1(c) In water flow test using two hydrants, ______ pressure is the pressure at the hydrant where the water is not flowing. Residual pressure. Reference NFPA 13 2016, Section A.24.2.2. NFPA 13 permits branchline hangers to be attached to metal roof decks if the pipe size doesnt exceed ____ inch(es) 1 in.
Section 4.15.4. Determine the maximum spacing permitted for an Extra Hazard hydraulically calculated system system with a density less than 0.25 gpm/ft^ 15ft Ref. NFPA 13 2016 Table 8.6.2.2.1. Ordinary Hazard is a term the specifies: An occupancy classification, More combustibility than light hazard, and A system area limitation of 52,000 ft 2. Reference NFPA 13 2016, Sections 5.3 and 8.2.1. A system that provides 1 1/2 inch hose stations to supply water for use primarily by trained personnel or by the fire department during initial response is a ___________. Class II Standpipe REfrence NFPA 14 2016 Section 3.3.19.2. Which of the following statements is incorrect when describing a deluge system? Deluge system detection devices should be automatically supervised. Deluge systems are required to be automatically supervised. Reference NFPA 13 2016, Sections 3.4.4, 7.3.3.1 and 7.3.3.2.
Choose all that apply to a Dry Pipe System
- Require approved pressure gauges on the water side of the dry pipe valve.
- Permit Horizontal sidewall sprinklers to be installed so that water is not trapped.
- Shall protect the dry pipe valve and supply pipe from freezing and mechanical damage. Reference NFPA 13 2016, Sections 7.2.1, 7.2.2 and 7.2.5.1. This pump is characterized by a method of producing flow by capturing a specific volume of fluid per pump revolution and reducing the fluid void by a mechanical means to displace the pumping fluid: Positive Discplacement Pump Refrence NFPA 20 2016 Section 3.3.44.14. Which of the following sprinklers produces large water droplets and is listed for its capability to provide fire control of specific high-challenge fire hazards? CMSA Sprinkler Refrence 13 2016 Section 3.6.4.2. A standpipe system with no permanently attached water supply that relies exclusively on the fire department connection to supply the system demand. Manual Dry Reference NFPA 14 2016
Cavitation A high-rise building where the floor of an occupiable story is greater than _____ above the lowest level of fire department vehicle access. 75ft Refrence NFPA 14 2016 Section 3.3.7. In a manufacturing plant classified as Ordinary Hazard Group 2, the sprinkler system is provided with one inside hose station. Per NFPA 13 2016, Table 11.2.3.1.2. what is the minimum inside hose demand? 50 gpm A water flow test was conducted using 2 hydrants. Both 2 1/2" outlets were used on hydrant #1 while one outlet was used on hydrant #2. The pitot reading at each hydrant was 12 psi. If the discharge coefficient is 0.7, what is the total water flow (gpm) during this test? The correct answer is 1356 gpm. Solution #14: Q = 29.84 cd 2 √P Q 1 = 29.84 x 0.7 x (2.5) 2 x √12 = 452.09 gpm
Q 2 = 29.84 x 0.7 x (2.5) 2 x √12 = 452.09 gpm Q 3 = 29.84 x 0.7 x (2.5) 2 x √12 = 452.09 gpm Q total = Q 1 + Q 2 + Q 3 Q total = 452.99 gpm + 452.99 gpm + 452.99 gpm = 1356.27 gpm Round down to 1356 gpm In a water flow test using two hydrants, _________ pressure is the pressure at the hydrant where the water is not flowing. Residual Pressure Refrence NFPA 13 2016 Section A.24.2.2. What type of information is collected when you are conducting a water flow test from one hydrant? Static and Residual Pressure Refrence NFPA 13 2016 Section A.24.2.2. Fire pump system plans are required to include which of the following:
Reference NFPA 13 2016, Section A.23.1. The Owner's Information Certificate indicates the property to be protected will contain nitrate film. Which of the following is also required to be pro Type, arrangement, location, and intended maximum quantities. Reference NFPA 13 2016, Figure A.23.1(b). What is defined as measuring 12 inches or more in its least dimension in any floor, platform, pavement, or yard? A floor opening. It is an opening through which persons may fall. Reference OSHA 29 CFR, Part 1910.21(a) (2). _________ indicates a mandatory requirement according to NFPA definitions? Shall. Reference NFPA 13 2016, Section 3.2.4. 100 gpm is flowing through 100' of 1 1/4in Schedule 40 pipe. How many feet of 1 1/2in pipe will produce the same friction loss? Step #1: Assume this is Schedule 40 pipe, C = 120. Use the Hazen-Williams formula to calculate the friction loss for the 1 ¼ in. pipe and the 1 ½ in. pipe. For 1 ¼ in. pipe (ID = 1.38):
P friction loss = 4.52 x Q 1. c 1.85 x d 4. P friction loss = 4.52 x 100 1. 120 1.85 x 1.38 4. P friction loss = 0.672 psi/ft For 1 ½ in. pipe (ID = 1.61): P friction loss = 4.52 x Q 1. c 1.85 x d 4. P friction loss = 4.52 x 100 1. 120 1.85 x 1.61 4. P friction loss = 0.317 psi/ft Step #2: Determine the total friction loss for 100 gpm flowing through 100 ft. of 1 ¼ in. Schedule 40 black steel pipe: 100 ft. x 0.672 psi/ft = 67.2 psi
P v = 0.001123 x 625
P v = 0.028 psi The max allowable shutoff head for a pump with a rated capacity of 900 gpm and a rated head of 250ft is: 350 ft. Max = 140% of rated head = 1.4 x 250 = 350 ft. The size requirements for the suction and discharge pipe of a fire pump with a rating of 1000 gpm are: 8 inches and 6 inches. Reference NFPA 20 2016, Table 4.27(a). A sprinkler system that is composed of 2 1/2" sch 40 steel pipe. What is the max distance between hangers? 15 ft. Reference NFPA 13 2016, Table 9.2.2.1(a) An installation req a 3 in sch 40 pipe. If a bend is req, what is the min. bending radius? The correct answer is 15 in. radius. Reference NFPA 13 2016, Section 6.3.8. Since the diameter is over 2 ½ in, we can have a minimum radius of 5 times the pipe diameter. This is 5x3 in.=15 in.
What is the minimum operating pressure for any sprinkler? The correct answer is 7 psi. Reference NFPA 13 2016, Section 23.4.4.11.1. Determine the maximum operating pressure for an Extra Hazard Group 2 sprinkler. The correct answer is 175 psi. Reference NFPA 13 2016, Section 23.4.4.12. The maximum operating pressure for an Extra Hazard sprinkler is 175 psi. Centrifugal pumps shall furnish not less than ____% 150, 65,140. Reference NFPA 20 2016, Section 6.
