NEVADA NV A-20 INDUSTRIAL PIPING
CONTRACTOR EXAM 2026 PRACTICE EXAM
◉ (D) A food processing facility requires a clean-in-place (CIP)
system operating at 185°F (85°C) for equipment sanitation. What
design specifications, materials, and validation procedures apply?
Answer: The CIP system requires 316L stainless steel with sanitary
finish (maximum 32 μin Ra for product contact surfaces), orbital
welding with full documentation, minimum 1/8" per foot (10.4 mm
per meter) slope for self-draining, and no dead legs exceeding 1.5
pipe diameters. According to food safety regulations (FSMA, GFSI)
and 3-A Sanitary Standards, the system must include tri-clamp
connections at service points, food-grade elastomers for gaskets
(typically EPDM or PTFE), pumps capable of achieving turbulent
flow (Reynolds number >10,000) in all cleaned surfaces, spray
devices validated for complete coverage, temperature and chemical
concentration monitoring with recording capability, automated
valve sequencing for proper isolation, comprehensive validation
protocols including coverage testing (riboflavin method), microbial
verification after cleaning cycles, temperature mapping throughout
the system, and formal documentation meeting food safety
regulatory requirements.
◉ (M) What are the requirements for anchoring a vertical riser of 8-
inch (203 mm) diameter steam pipe traveling through multiple
,floors in an industrial building? Answer: Vertical steam risers
require main anchors at the base designed to carry the entire weight
of the vertical pipe column plus a calculated portion of the
horizontal piping, with intermediate anchors at maximum 30 ft (9.1
m) or three-floor intervals. According to ASME B31.1 and pipe stress
analysis standards, the anchoring system must include detailed
engineering calculations accounting for thermal expansion forces,
proper load transfer to the building structure with appropriate
reinforcement, consideration of differential building movement,
expansion devices between anchor points to accommodate thermal
expansion, riser clamps at each floor providing lateral support,
appropriate sleeve sizing at floor penetrations to accommodate
movement, and comprehensive documentation of the anchoring
system design in the building mechanical systems records.
◉ (E) What is the purpose of a cold trap in a vacuum piping system?
Answer: A cold trap condenses vapors in a vacuum system before
they reach the vacuum pump, protecting the pump from
contamination, preventing backstreaming of pump oil into the
process, and enhancing the ultimate vacuum level by removing
condensable vapors. According to vacuum system design standards,
properly designed cold traps typically use liquid nitrogen or
refrigeration systems to create surfaces cold enough to condense
specific vapors, allow for isolation and cleaning without system
shutdown, incorporate features to prevent frozen condensate
blockage, and include appropriate safety features to prevent
overpressurization if warming occurs while isolated.
,◉ (D) An industrial facility requires a distribution system for high-
concentration hydrogen peroxide (50%+) used in sterilization
processes. What materials, design features, and safety systems
apply? Answer: For high-concentration hydrogen peroxide, the
system requires high-purity 316L stainless steel with
electropolished interior surfaces, PTFE, or high-purity aluminum,
with orbital welding for stainless steel or specialized connections
without dead spaces. According to chemical handling standards,
decomposition risk management, and ASME B31.3, the installation
requires elimination of catalytic materials (copper, brass, bronze,
iron oxides) from system components, minimization of mechanical
connections, specialized elastomers for gaskets and seals (typically
PTFE), continuous slope for complete drainage, decomposition
venting for all storage vessels and potential trapped points, absolute
prohibition of blind-ended pipes or dead legs, specialized pump
selection (typically magnetically coupled without seals),
comprehensive cleaning protocol before commissioning, leak
detection with appropriate monitoring, safety showers and eyewash
stations at all use and maintenance points, temperature monitoring
at critical points with automated cooling capability, and
decomposition detection systems with emergency mitigation
measures.
◉ (M) What are the requirements for installing thermal expansion
compensators in a high-temperature hot water heating system
operating at 250°F (121°C) in an institutional building? Answer:
Thermal expansion compensators (bellows, slip joints, or expansion
loops) must be sized to accommodate calculated expansion of 2.5
inches per 100 feet (63.5 mm per 30.5 meters) at 250°F (121°C),
, installed with proper guiding and anchoring to control movement in
the intended direction, and selected with appropriate pressure-
temperature ratings exceeding the system design conditions.
According to ASME B31.9 and expansion compensator manufacturer
guidelines, the installation requires detailed engineering
calculations documenting anticipated movement and stress analysis,
proper anchoring on both sides of the compensator sufficient to
withstand the spring forces generated, intermediate guides at
calculated intervals preventing lateral movement, cold pre-
stretching according to manufacturer specifications for bellows-type
compensators, appropriate access for inspection and maintenance,
and comprehensive documentation of all expansion control
elements in the building mechanical systems records.
◉ (E) What is the purpose of a coalescing filter in a compressed air
system? Answer: A coalescing filter removes liquid aerosols (oil and
water) and solid particles from compressed air by forcing air
through a fibrous or porous medium where small droplets combine
(coalesce) into larger droplets that drain away, while simultaneously
capturing solid contaminants. According to compressed air quality
standards (ISO 8573-1) and industry best practices, properly
selected filters achieve specified oil content, particle removal, and
moisture reduction required for downstream equipment protection,
process quality, instrument reliability, and breathing air safety, with
selection based on required cleanliness class, flow capacity,
acceptable pressure drop, and specific contaminants of concern.
CONTRACTOR EXAM 2026 PRACTICE EXAM
◉ (D) A food processing facility requires a clean-in-place (CIP)
system operating at 185°F (85°C) for equipment sanitation. What
design specifications, materials, and validation procedures apply?
Answer: The CIP system requires 316L stainless steel with sanitary
finish (maximum 32 μin Ra for product contact surfaces), orbital
welding with full documentation, minimum 1/8" per foot (10.4 mm
per meter) slope for self-draining, and no dead legs exceeding 1.5
pipe diameters. According to food safety regulations (FSMA, GFSI)
and 3-A Sanitary Standards, the system must include tri-clamp
connections at service points, food-grade elastomers for gaskets
(typically EPDM or PTFE), pumps capable of achieving turbulent
flow (Reynolds number >10,000) in all cleaned surfaces, spray
devices validated for complete coverage, temperature and chemical
concentration monitoring with recording capability, automated
valve sequencing for proper isolation, comprehensive validation
protocols including coverage testing (riboflavin method), microbial
verification after cleaning cycles, temperature mapping throughout
the system, and formal documentation meeting food safety
regulatory requirements.
◉ (M) What are the requirements for anchoring a vertical riser of 8-
inch (203 mm) diameter steam pipe traveling through multiple
,floors in an industrial building? Answer: Vertical steam risers
require main anchors at the base designed to carry the entire weight
of the vertical pipe column plus a calculated portion of the
horizontal piping, with intermediate anchors at maximum 30 ft (9.1
m) or three-floor intervals. According to ASME B31.1 and pipe stress
analysis standards, the anchoring system must include detailed
engineering calculations accounting for thermal expansion forces,
proper load transfer to the building structure with appropriate
reinforcement, consideration of differential building movement,
expansion devices between anchor points to accommodate thermal
expansion, riser clamps at each floor providing lateral support,
appropriate sleeve sizing at floor penetrations to accommodate
movement, and comprehensive documentation of the anchoring
system design in the building mechanical systems records.
◉ (E) What is the purpose of a cold trap in a vacuum piping system?
Answer: A cold trap condenses vapors in a vacuum system before
they reach the vacuum pump, protecting the pump from
contamination, preventing backstreaming of pump oil into the
process, and enhancing the ultimate vacuum level by removing
condensable vapors. According to vacuum system design standards,
properly designed cold traps typically use liquid nitrogen or
refrigeration systems to create surfaces cold enough to condense
specific vapors, allow for isolation and cleaning without system
shutdown, incorporate features to prevent frozen condensate
blockage, and include appropriate safety features to prevent
overpressurization if warming occurs while isolated.
,◉ (D) An industrial facility requires a distribution system for high-
concentration hydrogen peroxide (50%+) used in sterilization
processes. What materials, design features, and safety systems
apply? Answer: For high-concentration hydrogen peroxide, the
system requires high-purity 316L stainless steel with
electropolished interior surfaces, PTFE, or high-purity aluminum,
with orbital welding for stainless steel or specialized connections
without dead spaces. According to chemical handling standards,
decomposition risk management, and ASME B31.3, the installation
requires elimination of catalytic materials (copper, brass, bronze,
iron oxides) from system components, minimization of mechanical
connections, specialized elastomers for gaskets and seals (typically
PTFE), continuous slope for complete drainage, decomposition
venting for all storage vessels and potential trapped points, absolute
prohibition of blind-ended pipes or dead legs, specialized pump
selection (typically magnetically coupled without seals),
comprehensive cleaning protocol before commissioning, leak
detection with appropriate monitoring, safety showers and eyewash
stations at all use and maintenance points, temperature monitoring
at critical points with automated cooling capability, and
decomposition detection systems with emergency mitigation
measures.
◉ (M) What are the requirements for installing thermal expansion
compensators in a high-temperature hot water heating system
operating at 250°F (121°C) in an institutional building? Answer:
Thermal expansion compensators (bellows, slip joints, or expansion
loops) must be sized to accommodate calculated expansion of 2.5
inches per 100 feet (63.5 mm per 30.5 meters) at 250°F (121°C),
, installed with proper guiding and anchoring to control movement in
the intended direction, and selected with appropriate pressure-
temperature ratings exceeding the system design conditions.
According to ASME B31.9 and expansion compensator manufacturer
guidelines, the installation requires detailed engineering
calculations documenting anticipated movement and stress analysis,
proper anchoring on both sides of the compensator sufficient to
withstand the spring forces generated, intermediate guides at
calculated intervals preventing lateral movement, cold pre-
stretching according to manufacturer specifications for bellows-type
compensators, appropriate access for inspection and maintenance,
and comprehensive documentation of all expansion control
elements in the building mechanical systems records.
◉ (E) What is the purpose of a coalescing filter in a compressed air
system? Answer: A coalescing filter removes liquid aerosols (oil and
water) and solid particles from compressed air by forcing air
through a fibrous or porous medium where small droplets combine
(coalesce) into larger droplets that drain away, while simultaneously
capturing solid contaminants. According to compressed air quality
standards (ISO 8573-1) and industry best practices, properly
selected filters achieve specified oil content, particle removal, and
moisture reduction required for downstream equipment protection,
process quality, instrument reliability, and breathing air safety, with
selection based on required cleanliness class, flow capacity,
acceptable pressure drop, and specific contaminants of concern.
