Free NICET ITWBS Level II Exam Flashcards

A 10% reduction in full-flow residual pressure from the acceptance test or previous tests requires identifying the cause and correcting it if necessary. Compare like test conditions. The usual interval is annual; quarterly testing applies where the sole supply passes through a backflow preventer or pressure-reducing valve. This comparison does not measure full system demand.

Dry-pipe valves require annual trip testing. A partial-flow trip may be used in intervening years; conduct a full-flow trip at least every 3 years and when the applicable repair or alteration rules require it. A full-flow test evaluates water delivery as well as valve operation. Follow the listed valve instructions and impairment plan.

Test dry-pipe quick-opening devices quarterly under NFPA 25 (2023). An accelerator or exhauster assists valve operation; its operational test is distinct from the annual dry-valve trip and the 3-year full-flow trip. Do not substitute a semiannual alarm-switch schedule for this quarterly device test.

At the 3-year test, use either 40 psi for 2 hours with no more than 3 psi loss, or normal system pressure with the air source shut off for 4 hours: the low-air alarm must not activate. The alternative is an alarm criterion, not a second 3 psi allowance. Restore air supply and normal operation after testing.

Test the dry-pipe low-air alarm annually. Verify the specified signal at the correct receiving location and record the operating pressure. The proper setpoint depends on the valve, normal supervisory pressure, and manufacturer requirements; a single universal 10 psi offset does not fit every system. Preaction low-air alarms have their own schedule.

Test antifreeze annually before freezing weather, using the correct instrument and sampling rules. NFPA 25 (2023) permits qualifying existing factory-premixed legacy solution to remain at no more than 30% propylene glycol or 38% glycerine by volume. That exception does not authorize legacy refill. Apply listing, material compatibility, freeze protection, and specific ESFR exceptions.

Identify the solution and system before interpreting a refractometer reading. Listed solutions use manufacturer instructions for test locations and refill procedures. Confirm the measured protection covers the anticipated minimum temperature. An unknown, diluted, or out-of-specification solution needs the prescribed corrective action; field mixing or topping up by guesswork is not an acceptable remedy.

Every 5 years, manual standpipes and semiautomatic dry standpipes require a 2-hour hydrostatic test at 200 psi, or 50 psi above maximum pressure when that pressure exceeds 150 psi. Manual wet standpipes in combined sprinkler/standpipe systems have an exception. These rules are distinct from the Chapter 13 FDC-to-check-valve piping test.

The 5-year Class I/III flow test verifies required pressure at the hydraulically most remote outlet(s) while flowing system demand. Determine demand from the design criteria in force at installation and owner records; consult the AHJ if unknown. Do not assume one outlet at 500 gpm or impose current new-installation demand on every existing system.

Hose-connection pressure-regulating and sprinkler pressure-reducing valves generally need quarterly inspection, annual partial-flow testing, and a 5-year full-flow test. Master pressure-regulating devices have different provisions. Compare inlet pressure, outlet pressure, and flow with prior records and manufacturer settings. A static downstream reading alone cannot prove correct regulation under flow.

Inspect automatic air vents annually from floor level for damage and leakage. Remove and inspect their strainers, filters, and screens every 5 years; flush them clear or replace them when removed. Follow the listed instructions and impairment procedure. Annual visual inspection is not permission to dismantle a pressurized vent or permanently close its isolation valve.

For NFPA 25 (2023), many standard-response sprinklers start at 50 years; fast-response ESFR/CMSA at 20 years; other fast-response at 25 years; dry sprinklers at 20 years regardless of response type. These groups normally retest every 10 years; 75-year sprinklers have a 5-year interval. Harsh-service sprinklers start at 5 years. Sample at least 4 or 1% per representative area, whichever is greater.

Replace gauges every 5 years or test them against a calibrated gauge. Recalibrate or replace a gauge that is not accurate within 3% of full scale. Full scale is the gauge range, not the pressure reading: a 300 psi gauge has a 9 psi tolerance. Inspection of pressure and condition occurs more frequently.

An impairment leaves a system, component, or function out of order and can prevent operation during fire. A critical deficiency can materially affect performance; a noncritical deficiency does not materially affect performance. Use the actual condition and applicable NFPA 25 guidance, rather than automatically classifying every painted head, loose hanger, or overdue test alike.

A preaction system has closed automatic sprinklers; a deluge system discharges through open sprinklers or nozzles when its valve opens. Preaction valve operation depends on whether it is noninterlock, single-interlock, or double-interlock. Verify the applicable detection and pneumatic logic using the listed instructions and NFPA 25 test provisions; never apply one trip sequence to every type.

Dry and preaction low points can retain water after testing or condensation. Follow manufacturer and site procedures for auxiliary drains, increase attention after trips and during freezing weather, and record drainage problems. A double-valve drain arrangement normally separates the system from the drain opening; do not leave both valves open or assume draining one point drains all piping.

Test valve supervisory signal initiating devices semiannually. Verify that moving the valve from normal position produces the required signal and that restoring the valve clears it at the proper receiving location. Confirm valve position after testing. This is a functional test, separate from the quarterly inspection of an electrically supervised control valve.

Test mechanical waterflow alarm devices quarterly. Test vane-type and pressure-switch waterflow alarm devices semiannually. Coordinate with the receiving station and verify alarm transmission; inspecting a switch or hearing a local gong does not establish every required function. Apply NFPA 72 and the installed device requirements for timing and signal receipt.

Diesel pumps normally need weekly no-flow tests for at least 30 minutes. Most electric pumps need monthly tests for at least 10 minutes, but specified installations require weekly tests unless the redundancy allowance applies. Check NFPA 25 for limited-service controllers, vertical turbines, beyond-fire-department-capacity buildings, and insufficient-pressure suction sources; approved risk analysis can also affect intervals.

A circulation relief valve limits heat buildup during no-flow operation by releasing a small cooling flow where required. A main pressure relief valve limits excessive pressure in the circumstances for which it is provided. They serve different purposes. Do not infer valve size solely from an electric versus diesel driver or treat significant main-relief discharge as normal on every installation.

For the usual constant-speed pump test, obtain churn, rated-flow, and 150%-rated-flow data, subject to the standard’s supply limitations and pump arrangement. Record suction and discharge pressures, flow, speed, and relevant driver data. NFPA 20 design curve limits such as 65% head at 150% flow are not a substitute for NFPA 25 annual performance comparisons.

At equal gauge elevations with negligible velocity-head difference, net pressure is discharge pressure minus suction pressure. If discharge is 120 psi and suction is −5 psi, net pressure is 125 psi. Qualified evaluation applies elevation, velocity, and speed corrections where relevant; using discharge pressure alone can hide supply or pump deterioration.

NFPA 25 (2023) requires net pressure at each flow point to be at least 95% of an allowed baseline: original manufacturer curve, original unadjusted field curve, or nameplate-derived curve. Also evaluate system demand, rated flow, and applicable suction-supply requirements. A pump meeting 95% can still fail to supply the most demanding system.

Conventional packed pumps generally require controlled leakage for cooling and lubrication; mechanical seals have different requirements. Use the manufacturer’s instructions for the installed seal. A universal one-drop-per-second rule can cause incorrect adjustment. Record abnormal leakage, heat, vibration, or bearing condition and have qualified personnel correct the cause.

The jockey pump maintains normal system pressure and should respond to small pressure losses before the fire pump starts. Fire-pump starting settings and jockey start/stop settings depend on the actual suction pressure, pump curve, and NFPA 20 arrangement. Verify recorded settings and automatic operation; an arbitrary 5–10 psi offset is not universal.

Operate hydrants annually and flush for at least 1 minute until foreign material clears. Observe leaks and, for dry-barrel hydrants, drainage after closing. Failure to drain within 60 minutes requires the prescribed corrective action or drain-plug arrangement with pumping after use. Coordinate flow, traffic, erosion, and freezing hazards before testing.

For a circular outlet, Q = 29.83 × c × d² × √P, with Q in gpm, d in inches, and pitot pressure P in psi. Typical NFPA 291 coefficients are 0.90 for a smooth rounded outlet, 0.80 for a square sharp outlet, and 0.70 for an outlet projecting into the barrel. Use the actual outlet configuration.

Project Qr = Qf × [(Ps − Pr)/(Ps − Pf)]^0.54, where Ps is static pressure, Pf is measured residual pressure during flow Qf, and Pr is the target residual pressure. Twenty psi is a common rating target, not every system’s required residual. The test must produce a meaningful pressure drop and represent actual supply conditions.

Inspect tank exteriors, supports, foundations, vents, and access structures quarterly. Inspect interiors of steel tanks without corrosion protection every 3 years; the usual interval for other tanks is 5 years. These are distinct from water-level checks: quarterly with supervised alarms connected to a constantly attended location, otherwise monthly. Apply the actual tank’s exceptions and condition.

Maintain tank water temperature at least 40°F (4°C). Heating-system and water-temperature inspection frequencies differ and depend on supervision to a constantly attended location; use the specific Chapter 9 requirement. Test the heating system and low-temperature alarms before the heating season. A supervised alarm does not eliminate inspections or authorize letting the tank freeze.

Flow-test underground and exposed private fire-service mains every 5 years to determine whether flow and pressure have deteriorated. Compare meaningful results with acceptance or prior records and investigate deterioration. A main drain test or a brief hydrant flush does not replace this supply test. Changes in public supply, valves, or pipe condition can each affect results.

An annual forward-flow test verifies that the backflow assembly can pass the required fire-protection flow. It differs from a differential-pressure backflow certification test intended to protect potable water. Identify the required system flow, test arrangement, and applicable exceptions; a passing potable-water backflow test alone does not prove adequate fire flow.

Inspect FDCs quarterly for accessibility, caps, swivels, gaskets, identification, clappers, drains, leakage, damage, and visible obstruction. Chapter 13 requires FDC-to-check-valve piping hydrostatic testing at 150 psi for 2 hours at least every 5 years. Manual or semiautomatic dry standpipe testing under Chapter 6 has different scope and pressure criteria.

NFPA 25 Chapter 14 lists conditions requiring an obstruction investigation, including obstructing foreign material, corrosion-related leakage, and specified delivery-time deterioration. Identify the actual condition and applicable subsection. A main drain pressure reduction first requires investigation of its cause; it does not by itself prove that all sprinkler piping is obstructed.

The usual internal piping condition assessment interval is 5 years, unless an approved risk analysis establishes another frequency. Its purpose is to detect foreign material that could obstruct piping or sprinklers. NFPA 25 permits appropriate alternative examination methods; finding potentially obstructing material escalates to a Chapter 14 obstruction investigation rather than waiting for the next assessment.

NFPA 25 (2023) minimum locations are: system/water control valve where provided; remote end of the remote cross main; branch line near the most remote line at its cross-main connection; that branch line’s end; and branch piping directly connected to the most remote low-point drain. This updated five-point list differs from older editions’ four broad locations.

Slime, tubercules, corrosion products, and internally caused leaks require evaluation. Test tubercules or slime for indications of microbiologically influenced corrosion as required. Color, odor, or pitting alone does not establish a specific organism or mechanism. Document location, material, extent, sampling method, and results to guide qualified investigation and corrective work.

Where an investigation finds enough material to obstruct pipe or sprinklers, qualified personnel must conduct the required complete flushing program. Determine extent and an appropriate method before work, manage impairments, protect people and property, and verify restoration. Do not improvise chemical cleaning, pressure flushing, suction screens, or a universal velocity from an unrelated installation standard.

Video inspection can show internal deposits; ultrasonic wall-thickness testing can identify metal loss. Neither automatically proves every part of a system unobstructed or identifies the cause of corrosion. Select a permitted method suited to the required assessment and document access, coverage, and limitations. Remaining uncertainty can require additional investigation.

Record system identity, examined locations, methods, dates, measured conditions, materials found, test results, limitations, and corrective recommendations. Separate observations from unconfirmed causes. Identify affected protection and communicate urgent findings through the owner’s impairment procedure. Photos are useful evidence, but they do not replace measurements or make every inspection a universal photo/signature mandate.

Before servicing, identify electrical, pneumatic, hydraulic, mechanical, and stored energy. Follow the employer’s applicable energy-control procedure: isolate, lock/tag as required, relieve or restrain stored energy, and verify the controls are effective. A stopped motor or closed valve does not prove isolation. Electrical work also invokes OSHA Subpart S and qualified-person requirements.

A tank or pit must be evaluated for confined-space and permit-space hazards; not every confined space is automatically permit-required. A hazardous atmosphere includes oxygen below 19.5% or above 23.5%, flammables above 10% of the lower flammable limit, or hazardous toxic exposure. Acceptable oxygen alone does not authorize entry; use the applicable entry, attendant, rescue, and testing program.

For a non-self-supporting ladder, position the foot about one-quarter of its working length from the support. For access to an upper landing, side rails normally extend at least 3 feet above it, with the standard’s secured-ladder/grasping-device alternative where extension is impossible. Use stable footing, face the ladder, and keep at least one hand available to grasp it.

Before opening a component, coordinate the impairment, identify every pressure source, isolate through the approved procedure, release trapped pressure safely, and verify the section is depressurized. Gauges can fail and check valves can trap pressure. Never loosen a coupling to find out whether a line is pressurized. Restore and verify the affected system after work.

Do not open an energized fire-pump controller merely to obtain routine ITM readings. Use external instruments and displays where provided. Exposed electrical work requires qualified personnel and the applicable electrical safety procedure. Voltage alone does not establish working clearance or arc-flash boundaries; equipment arrangement, task, labeling, and the hazard assessment matter.

The owner designates an impairment coordinator; if none is designated, the owner acts in that role. The coordinator manages planned and emergency impairments, including scope, authorization, notifications, tagging, mitigation, and restoration verification. Technicians communicate the actual affected protection rather than treating a test-mode signal as permission to disable the entire system.

When required protection is out of service for more than 10 hours in 24 hours, the impairment coordinator arranges an approved measure: evacuation, fire watch, temporary water supply, or a program eliminating ignition sources and limiting fuel. Applicable notifications and emergency actions start when required, not after 10 hours. The AHJ can require additional measures.

Use tags that identify the impaired system, area, responsible parties, and required actions under the owner/AHJ program. NFPA 25 does not establish one universal red/yellow/green inspection-tag scheme for every jurisdiction. Tag color cannot replace evaluating the actual condition, making notifications, or verifying the system before removing an impairment tag.

Keep original acceptance, as-built, hydraulic design, and other required baseline documents for the system’s life. Retain subsequent ITM records at least 1 year after the next inspection, test, or maintenance of that type. Longer legal, AHJ, or owner retention rules may apply. Missing historical data should be reported rather than replaced with an invented baseline.

Before tests that could transmit alarms or impair protection, coordinate with the owner, monitoring organization, and other required parties. Record authorization, affected systems, start time, expected effects, and contacts. Afterward verify normal valve positions, pressures, controller modes, signals, and receiving-station status, then confirm restoration with the required parties. Do not leave a system in test mode.