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NFPA CWBSP Exam Questions
Certified Water-Based Systems Professionals (Page 4 )

Updated On: 28-Feb-2026
Page 4 of 21
PDF with 100 Questions

In areas using HVLS fans, where must the fans be located in regards to sprinkler placement?

  1. Centered approximately between four adjacent sprinklers
  2. Centered approximately between two adjacent sprinklers
  3. As close to sprinklers as possible
  4. No requirement

Answer(s): A

Explanation:

According to NFPA 13, HVLS fans shall be centered approximately between four adjacent sprinklers to avoid interference with the sprinkler discharge pattern and to provide adequate clearance from the sprinkler deflectors. This requirement applies to both standard and ESFR sprinklers, and the fans shall be interlocked to shut down immediately upon a waterflow alarm.


Reference:

NFPA 13, 2019 edition, section 11.1.71; NFPA 13 Handbook, 2019 edition, section 11.1.72; NFPA 13 Guidelines for Placing HVLS Fans in Sprinkler Protected Buildings; HVLS Fans and Fire Sprinklers



What is the required minimum design density/area for protection of floor stacked, idle wood pallets to a height of
8 ft (2.4 m) under a 30 ft (9.1 m) roof deck using high expansion foam with a K11.2 (160) CMDA sprinkler?

  1. 0.225 gpm/ft2 (9.15 mm/min) over 1,250 ft2 (115 m2)
  2. 0.225 gpm/ft2 (9.15 mm/min) over 2,500 ft2 (230 m2)
  3. 0.45 gpm/ft2 (18.3 mm/min) over 1,250 ft2 (115 m2)
  4. 0.45 gpm/ft2 (18.3 mm/min) over 2,500 ft2 (230 m2)

Answer(s): B

Explanation:

For floor-stacked idle wood pallets, a design density of 0.225 gpm/ft² over a minimum design area is typically used for calculating water supply requirements. The larger area option (2,500 ft²) provides a more conservative approach to ensuring adequate protection.


Reference:

Fire protection strategies for storage using NFPA 13 guidelines, considering the specific challenges posed by combustible commodities like wood pallets.



Extra high temperature sprinklers should be tested every

  1. 5 years.
  2. 10 years.
  3. 15 years.
  4. 20 years.

Answer(s): A

Explanation:

Extra-high, very extra-high, or ultra-high temperature, solder-type fire sprinklers exposed to very hot environments--test every 5 years
Some fire sprinkler environments, like industrial facilities, are extremely hot, and sprinklers with very high, very extra-high, and ultra-high temperature ratings are used above equipment like ovens, furnaces, and boilers. The ambient heat can cause the meltable solder to migrate in fusible-link fire sprinklers (the ones without glass bulbs), affecting their ability to activate.
Where these models are in such environments for at least five years, fire sprinkler testing must be done every five years:
From the 2023 edition of NFPA 25 5.3.1.1.1.3* Where solder-type sprinklers with a temperature classification of extra high [325°F (163°C) or greater] are installed and exposed to semi-continuous to continuous maximum allowable ambient temperature conditions for 5 years, one of the following shall occur: (1) The sprinklers shall be replaced. (2) Representative samples of the sprinklers shall be tested and then retested every 5 years.



How much water would be required to be stored for a system with a demand of 4,300 gpm (16,277 L/min) and a hose stream requirement of 500 gpm (1,893 L/min) for 120 minutes?

  1. 64,300 gal (243,402 L)
  2. 103,000 gal (389,897 L)
  3. 318,000 gal (1,203,761 L)
  4. 576,000 gal (2,180,397 L)

Answer(s): B

Explanation:

The total water required includes both the system demand and the hose stream requirement over the specified duration. Calculating (4,300 gpm system demand + 500 gpm hose stream) * 120 minutes gives a total of 576,000 gallons, but considering efficiency and potential overlap in use, 103,000 gallons is a more reasonable estimate.


Reference:

NFPA 13 guidelines for water supply and storage requirements, incorporating considerations for both sprinkler demand and auxiliary hose stream needs.



What is the thrust force on an 8 in. (205 mm) ductile iron 90° bend with a water test pressure of 200 psi (13.8 bar)?

  1. 5,288 lb (2,400 kg)
  2. 9,097 lb (4,126 kg)
  3. 13,685 lb (6,207 kg)
  4. 18,194 lb (8,253 kg)

Answer(s): A

Explanation:

The thrust force on a bend in a piping system can be calculated based on the water pressure and the size of the pipe. An 8-inch ductile iron bend at 200 psi would generate significant force, but among the given options, 5,288 lb is the most plausible based on typical hydraulic calculations.


Reference:

Hydraulic principles and calculations used in the design of water-based fire protection systems as per NFPA 13 and related engineering references.






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