Table of Contents
Task B-7 Installs underground water supplies
Task Descriptor
Sprinkler fitters install and connect underground piping and components from a predetermined water source to provide a reliable and adequate water supply to fire protection systems. While trenching and backfilling are performed by other trades, sprinkler fitters are involved in supervising this work. After installation of piping and components, they also must flush system to remove debris that can interfere with the operation of the fire protection system.
B-7.01 - Supervises trenching and backfilling
B-7.01 - Supervises trenching and backfilling
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| B-7.01.01P |
select and use tools and equipment |
tools and equipment are selected and used according to task |
| B-7.01.02P |
lay out location for trench |
location for trench is laid out to ensure accessibility for machinery, material and workers |
| B-7.01.03P |
verify location of underground/overhead utilities |
location of underground/overhead utilities is verified to prevent injury and disruption of service |
| B-7.01.04P |
coordinate tie-ins with AHJ and municipal waterworks |
tie-ins are coordinated with AHJ and municipal waterworks to avoid or minimize disruptions to water supply |
| B-7.01.05P |
inspect trench |
trench is inspected for adequate size and depth according to OHS and AHJ |
| B-7.01.06P |
coordinate laydowns |
laydowns for debris, backfill and installation material and tools are coordinated according to task |
| B-7.01.07P |
select backfill material |
backfill material is selected according to codes, standards and regulations |
| B-7.01.08P |
ensure safe access to trench |
safe access to trench is ensured for installation of underground materials |
| B-7.01.09P |
verify backfill compaction |
backfill compaction is verified according to site requirements and specifications |
Range of Variables (include, but not limited to)
- utilities: water, gas, power, sewage, data and telecommunications
- backfill material: sand, screened gravel, native fill
Knowledge
| Reference Code |
Learning Outcomes and Objectives |
| B-7.01.01L |
demonstrate knowledge of safety procedures and requirements for trenching and backfilling
- interpret information about trenching and backfilling found on drawings and specifications
|
| B-7.01.02L |
demonstrate knowledge of procedures and requirements for trenching and backfilling
- identify tools, equipment and PPE related to trenching and backfilling
- identify workplace hazards, and describe safe work practices for trenching and backfilling
- describe procedures for trenching and backfilling
- describe site conditions that affect trenching and backfilling
- describe shoring and piping requirements
- describe laydowns and spoil piles for debris, backfill material and installation material
- identify types of access equipment related to trenching and backfilling
- identify types of backfill material, and describe their characteristics and applications
- describe procedures to inspect trenches
|
| B-7.01.03L |
demonstrate knowledge of communication practices for trenching and backfilling
- describe audible/visual procedures for communicating during trenching and backfilling
|
| B-7.01.04L |
demonstrate knowledge of training and certification requirements for trenching and backfilling
- identify training and certification requirements for workers performing trenching and backfilling
|
| B-7.01.05L |
demonstrate knowledge of regulatory requirements for trenching and backfilling
- identify codes, standards and regulations, and AHJ requirements related to trenching and backfilling
- identify OHS requirements related to trenching and backfilling
|
| B-7.01.06L |
demonstrate knowledge of sustainability and environmental stewardship practices
- describe procedures to dispose of and recycle spoil waste
|
Range of Variables (include, but not limited to)
- backfill material: sand, screened gravel, native fill
B-7.02 - Installs underground piping and components
B-7.02 - Installs underground piping and components
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| B-7.02.01P |
select and use tools and equipment |
tools and equipment are selected and used according to task |
| B-7.02.02P |
identify type and class of piping material and fittings |
type and class of piping material and fittings are identified according to ground conditions, AHJ, drawings, specifications, and codes, standards and regulations |
| B-7.02.03P |
assemble pipe and fittings |
pipe and fittings are assembled using joining methods according to specifications, and codes, standards and regulations |
| B-7.02.04P |
restrain pipe and fittings |
pipe and fittings are restrained with anchoring systems to provide stability, prevent pipe movement and separation, and protect against damage according to manufacturers' specifications, and codes, standards and regulations |
| B-7.02.05P |
apply protective material |
protective material is applied below and above pipe to prevent damage from foreign objects |
| B-7.02.06P |
attach components |
components are attached to piping to allow control and isolation of fire water system |
| B-7.02.07P |
install components within chambers and underground pits |
components are installed within chambers and underground pits according to standards to ensure accessibility |
| B-7.02.08P |
connect piping to water source |
piping is connected to water source with devices to ensure adequate water supply to fire protection system |
| B-7.02.09P |
place tracer wire and warning tape |
tracer wire and warning tape is placed in trench on or above the pipe according to municipal requirements, site conditions and industry practices |
| B-7.02.10P |
ensure cathodic/corrosion protection |
cathodic/corrosion protection meets manufacturers' specifications and AHJ |
| B-7.02.11P |
allow for clearances and tolerances |
clearances and tolerances between piping and surrounding environment are allowed for to prevent damage caused by excessive stress loads |
| B-7.02.12P |
seal pipe penetrations |
pipe penetrations through structures are sealed to maintain impermeability and flexibility of structure using various materials |
| B-7.02.13P |
terminate and cap pipe |
pipe is terminated and capped in selected location inside building, ensuring its accessibility |
| B-7.02.14P |
install testing connection to water termination point and fire hydrants |
testing connection is installed to water termination point and fire hydrants to allow for flushing, testing and chlorination according to AHJ, and codes, standards and regulations |
| B-7.02.15P |
ensure operation of equipment and components |
equipment and components operate according to manufacturers' specifications, and codes, standards and regulations |
Range of Variables (include, but not limited to)
- ground conditions: acidity, moisture content, soil properties (sandy, rocky), compaction density, local conditions
- joining methods: bell and spigot, flange with gasket, mechanical, fusion welding, solvent cementing, grooved
- anchoring systems: thrust blocks, rodding, anchors, clamps
- protective material: sand, screened gravel
- foreign objects: rocks, roots, debris
- components: gate valves, PIVs, water monitor assembly, fire hydrants, backflow preventers
- devices: tapping valves, underground tees
- cathodic/corrosion protection: sacrificial anodes, petroleum-based tape, plastic wrap
- surrounding environment: under structures, railroad tracks, roadways and stockpiles; through concrete and timber structures
- structures: walls, foundations, floors
- materials: cement, caulking, flexible mastic, flexible assembly
Knowledge
| Reference Code |
Learning Outcomes and Objectives |
| B-7.02.01L |
demonstrate knowledge of underground piping and components, characteristics, applications and operation
- identify underground piping and components, and describe their characteristics and applications
- describe operating principles of underground piping and components
- interpret information about underground piping and components found on drawings and specifications
|
| B-7.02.02L |
demonstrate knowledge of clearances and tolerances
- identify where clearances and tolerances should be taken into consideration
|
| B-7.02.03L |
demonstrate knowledge of water source connections
- identify types of public water sources and their connection requirements
- identify location of water source connection
|
| B-7.02.04L |
demonstrate knowledge of procedures to install underground piping and their components
- identify tools and equipment used to install underground piping and components, and describe their procedures for use
- identify work site hazards, and describe safe work practices for underground piping and components
- describe procedures to install underground piping and components
|
| B-7.02.05L |
demonstrate knowledge of regulatory requirements for underground piping and components
- identify codes, standards and regulations for underground piping and components
|
| B-7.02.06L |
demonstrate knowledge of sustainability and environmental stewardship practices
- describe procedures to dispose of and recycle underground piping and components
|
Range of Variables (include, but not limited to)
- components: gate valves, PIVs, water monitor assembly, fire hydrants, backflow preventers
B-7.03 - Flushes underground system
B-7.03 - Flushes underground system
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| B-7.03.01P |
select and use tools and equipment |
tools and equipment are selected and used according to task |
| B-7.03.02P |
select and install flanges, fittings and valves |
flanges, fittings and valves are selected and installed on underground connection inside building to allow for required flow |
| B-7.03.03P |
ensure underground control valve is open |
underground control valve is open at water source to pressurize system |
| B-7.03.04P |
connect hoses to flushing connections |
hoses are connected to flushing connections at determined points and water is directed to safe location |
| B-7.03.05P |
discharge water flow |
water flow is discharged from flushing connections allowing predetermined flow requirements and according to environmental considerations |
| B-7.03.06P |
complete documentation |
documentation is completed according to AHJ, and codes, standards and regulations |
Range of Variables (include, but not limited to)
- tools and equipment: pitot tube, Y-isolation valves, fire hoses, fire hydrant wrenches, diffusers, burlap sack with tie wires
Knowledge
| Reference Code |
Learning Outcomes and Objectives |
| B-7.03.01L |
demonstrate knowledge of underground piping and components, characteristics, applications and operation
- identify underground piping and components, and describe their characteristics and applications
- describe operating principles of underground piping and components
- interpret information about underground piping and components found on drawings and specifications
|
| B-7.03.02L |
demonstrate knowledge of procedures to flush underground systems
- identify tools and equipment used to flush underground systems, and describe their procedures for use
- identify work site hazards, and describe safe work practices for flushing underground systems
- describe procedures to flush underground systems
- identify required flow rates for flushing of underground systems
|
| B-7.03.03L |
demonstrate knowledge of regulatory requirements for flushing of underground systems
- identify codes, standards and regulations for flushing of underground systems
|
| B-7.03.04L |
demonstrate knowledge of sustainability and environmental stewardship practices
- identify environmentally sound practices to discharge treated water
|
Range of Variables (include, but not limited to)
- tools and equipment: pitot tube, Y-isolation valves, fire hoses, fire hydrant wrenches, diffusers, burlap sack with tie wires
Task B-8 Installs fire pump units
Task Descriptor
Fire pump units are an integral part of fire protection systems. They provide pressure and flow to the fire protection system. They can be used with stand-alone or secondary water supplies, or as a supplement to municipal water supply.
Sprinkler fitters coordinate with designers and engineers to determine the location of pumps, drivers, controllers and components. They install pumps, drivers, controllers and components according to standards and site conditions.
B-8.01 - Determines location of pumps, drivers, controllers and components
B-8.01 - Determines location of pumps, drivers, controllers and components
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| B-8.01.01P |
select and use tools and equipment |
tools and equipment are selected and used according to task |
| B-8.01.02P |
inspect room layout |
room layout is inspected prior to installation to confirm adequate space, lighting, permanent heating and drainage, and to prevent interference of pumps and components with other building services |
| B-8.01.03P |
verify layout with drawings |
layout is verified with drawings to ensure compliance with specifications |
| B-8.01.04P |
lay out pumps and components |
pumps and components are laid out in pump room to ensure accessibility for service and compliance with specifications |
| B-8.01.05P |
verify if pump bypass is required |
pump bypass requirements are verified according to mechanical engineered shop drawings, AHJ, and codes, standards and regulations |
Range of Variables (include, but not limited to)
- pumps: centrifugal, positive displacement, vertical shaft, horizontal split case, end suction, vertical inline
- specifications: schematic drawings, shop drawings, spool drawings, codes and standards, pump manufacturers’ installation guidelines
Knowledge
| Reference Code |
Learning Outcomes and Objectives |
| B-8.01.01L |
demonstrate knowledge of pumps, drivers, controllers, their components, characteristics, applications and operation
- identify pumps, drivers, controllers, and their components, and describe their characteristics and applications
- describe operating principles of pumps, drivers, controllers, and their components
- interpret information about pumps, drivers, controllers, and their components found on drawings and specifications
|
| B-8.01.02L |
demonstrate knowledge of requirements and methods used to determine location of pumps, drivers, controllers and components
- identify tools and equipment used to determine location of pumps, drivers, controllers and components, and describe their procedures for use
- describe requirements and methods to determine location and accessibility of pumps, drivers, controllers and components
|
| B-8.01.03L |
demonstrate knowledge of water source connections
- identify types of water supplies used for fire pump installations and system hydraulic demand requirements
- identify impacts of cross-connection control as they relate to fire pump and hydraulic demand
|
| B-8.01.04L |
demonstrate knowledge of regulatory requirements for determining location of pumps, drivers, controllers and components
- identify codes, standards and regulations for determining location of pumps, drivers, controllers and components
|
| B-8.01.05L |
demonstrate knowledge of sustainability and environmental stewardship practices
- identify practices that contribute to environmental protection such as location of fuel tanks and lines
|
Range of Variables (include, but not limited to)
- pumps: centrifugal, positive displacement, vertical shaft, horizontal split case, end suction, vertical inline
- drivers: diesel, electric, steam
B-8.02 - Installs pumps, drivers, controllers and components
B-8.02 - Installs pumps, drivers, controllers and components
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| B-8.02.01P |
select and use tools and equipment |
tools and equipment are selected and used according to task |
| B-8.02.02P |
place pumps |
pumps are placed in predetermined locations on elevated base or pad according to manufacturers’ specifications, and codes, standards and regulations |
| B-8.02.03P |
adjust pump elevation |
pump elevation is adjusted to set and secure pump in place using materials |
| B-8.02.04P |
mount controllers and power transfer switches |
controllers and power transfer switches are mounted in desired location within pump room and within sight of pump according to codes, standards and regulations |
| B-8.02.05P |
connect piping and fire pump components |
piping and fire pump components are connected to fire pump, jockey pump and controllers according to AHJ, manufacturers' specifications, and codes, standards and regulations |
| B-8.02.06P |
connect and align driver |
driver is connected to and aligned with pump using drive components to provide power to pump |
| B-8.02.07P |
set fuel tanks and piping |
fuel tanks and piping are set to allow fuel supply to diesel driver according to AHJ, manufacturers’ specifications, and codes, standards and regulations |
| B-8.02.08P |
install fuel lines |
fuel lines between tank and engine are installed according to AHJ, manufacturers’ specifications, and codes, standards and regulations |
| B-8.02.09P |
install exhaust system |
exhaust system is installed to evacuate exhaust from pump room to exterior according to AHJ, manufacturers’ specifications, and codes, standards and regulations |
| B-8.02.10P |
install strainers |
strainers are installed to protect pump from debris from raw water sources |
| B-8.02.11P |
ensure operation of equipment and components |
equipment and components operate according to manufacturers' specifications, and codes, standards and regulations |
Range of Variables (include, but not limited to)
- materials: shims, mounts, grout, concrete
- pump components: sensing lines, test headers, flowmeters, bypass connections, relief and circulation valves, controller cabinets, suction and discharge piping, anti-vortex plate, suction strainers, check valves, control valves
- drive components: right-angle gear drives, universal joints, flexible couplings
- raw water sources: wet pits, open reservoirs, penstocks, lakes, streams, rivers, ponds, flumes, draft ports
Knowledge
| Reference Code |
Learning Outcomes and Objectives |
| B-8.02.01L |
demonstrate knowledge of pumps, drivers, controllers, their components, characteristics, applications and operation
- identify pumps, drivers, controllers, and their components, and describe their characteristics and applications
- describe operating principles of pumps, drivers, controllers and their components
- interpret information about pumps, drivers, controllers and their components found on drawings and specifications
|
| B-8.02.02L |
demonstrate knowledge of water source connections
- identify types of water supplies used for fire pump installations and hydraulic system demand requirements
- identify impacts of cross-connection control as they relate to fire pump and hydraulic demand
|
| B-8.02.03L |
demonstrate knowledge of procedures to install pumps, drivers, controllers and their components
- identify tools and equipment used to install pumps, drivers, controllers, and their components, and describe their procedures for use
- describe procedures to install pumps, drivers, controllers and their components
|
| B-8.02.04L |
demonstrate knowledge of regulatory requirements for pumps, drivers, controllers and their components
- identify codes, standards and regulations for pumps, drivers, controllers and their components
|
Range of Variables (include, but not limited to)
- pumps: centrifugal, positive displacement, vertical shaft, horizontal split case, end suction, vertical inline
- drivers: diesel, electric, steam
- components (pump): sensing lines, test headers, flowmeters, bypass connections, relief and circulation valves, controller cabinets, suction and discharge piping, anti-vortex plate, suction strainers, check valves, control valves
- components (drive): right-angle gear drives, universal joints, flexible couplings
- types of water supplies: municipal, private, tanks, reservoirs, raw, potable and non- potable
Task B-9 Installs fire department connections
Task Descriptor
Fire department connections are an important component found on most sprinkler and standpipe systems. When a sprinkler system activates, the fire department can connect hose lines from a pumper truck to the fire department connection. This connection allows the fire department to supplement water to the fire protection system in the event of a fire.
Sprinkler fitters, in consultation with AHJ, determine the location, size and type of fire department connections. They install fire department connections and their ancillary equipment according to municipal requirements to ensure they are functional and easily accessible to fire department services.
B-9.01 - Determines location, size and type of fire department connections
B-9.01 - Determines location, size and type of fire department connections
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| B-9.01.01P |
select and use tools and equipment |
tools and equipment are selected and used according to task |
| B-9.01.02P |
confirm fire department connection and piping layout with drawings |
fire department connection and piping layout is confirmed prior to installation to verify adequate space, heating, drainage, code requirements and accessibility for fire department, according to AHJ, and codes, standards and regulations |
| B-9.01.03P |
verify size and type of hose connection, check valves and additional components |
size and type of hose connection, check valves and additional components are verified according to AHJ, and codes, standards and regulations |
Range of Variables (include, but not limited to)
- hose connections: CSA, quick-connect, Storz, AHJ approved
Knowledge
| Reference Code |
Learning Outcomes and Objectives |
| B-9.01.01L |
demonstrate knowledge of fire department connections, their components, characteristics, applications and operation
- identify types of fire department connections, and describe their characteristics, applications and installation requirements
- describe operating principles of fire department connections
- interpret information about fire department connections found on drawings and specifications
|
| B-9.01.02L |
demonstrate knowledge of procedures to determine location, size and type of fire department connections
- describe procedures to determine location, size and type of fire department connections
- identify required proximity of fire department connections in relation to hydrants and fire department access
|
| B-9.01.03L |
demonstrate knowledge of regulatory requirements for fire department connections
- identify codes, standards and regulations for fire department connections
|
Range of Variables (include, but not limited to)
- types of fire department connections: free-standing, exposed, flush, dry
- installation requirements: requirements for check valves, placement of fire department connections, requirements for drainage of fire department connections, requirements for hose thread connections
B-9.02 - Installs fire department connections, piping and components
B-9.02 - Installs fire department connections, piping and components
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| B-9.02.01P |
select and use tools and equipment |
tools and equipment are selected and used according to task |
| B-9.02.02P |
install pipe, devices and signage for fire department connections |
pipe, devices and signage for fire department connections are installed according to AHJ, and codes, standards and regulations |
| B-9.02.03P |
confirm orientation and thread compatibility of fire department connections |
fire department connections are oriented to achieve desired position, and threads are confirmed to be compatible according to site conditions, application, manufacturers’ specifications and AHJ |
Knowledge
| Reference Code |
Learning Outcomes and Objectives |
| B-9.02.01L |
demonstrate knowledge of fire department connections, their components, characteristics, applications and operation
- identify types of fire department connections, and describe their characteristics, applications and installation requirements
- describe operating principles of fire department connections
- interpret information about fire department connections found on drawings and specifications
|
| B-9.02.02L |
demonstrate knowledge of procedures to install fire department connection piping and components
- identify tools and equipment used to install fire department connection piping and components, and describe their procedures for use
- describe procedures to install fire department connection piping and components
- identify required proximity of fire department connections in relation to hydrants and fire department access
|
| B-9.02.03L |
demonstrate knowledge of regulatory requirements for fire department connections
- identify codes, standards and regulations for fire department connections
|
Range of Variables (include, but not limited to)
- types of fire department connections: free-standing, exposed, flush, dry
- installation requirements: requirements for check valves, placement of fire department connections, requirements for drainage of fire department connections, requirements for hose thread connections
Task B-10 Installs private water supply systems
Task Descriptor
Private water supply systems are typically the only water supply for the fire protection system in remote areas. They may also be used as a secondary supply in areas where municipal supply is insufficient.
Sprinkler fitters install tanks and connect to the fire protection system.
B-10.01 - Installs water tanks
B-10.01 - Installs water tanks
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| B-10.01.01P |
select and use tools and equipment |
tools and equipment are selected and used according to task |
| B-10.01.02P |
determine location and place water tank |
location of water tank is determined, and tank is placed according to site conditions, accessibility and load- bearing requirements |
| B-10.01.03P |
arrange for installation of base, mounts and anchors |
base, mounts and anchors are installed to level, stabilize and support tank |
| B-10.01.04P |
apply cathodic and corrosion protection |
cathodic protection is installed as required to prevent electrolysis, and corrosion protection is applied to prevent exterior and interior corrosion |
| B-10.01.05P |
fill water tank with water |
water tank is filled with water to verify its integrity according to project and manufacturers’ specifications, AHJ, and codes, standards and regulations |
Knowledge
| Reference Code |
Learning Outcomes and Objectives |
| B-10.01.01L |
demonstrate knowledge of water tanks, their components, characteristics, applications and operation
- identify types of water tanks, and describe their characteristics and applications
- identify types of water connections and their components, and describe their characteristics and applications
- describe operating principles of water tanks
- interpret information about water tanks found on drawings and specifications
|
| B-10.01.02L |
demonstrate knowledge of procedures to install water tanks
- identify tools and equipment used to install water tanks, and describe their procedures for use
- identify workplace hazards, and describe safe work practices to install water tanks
- describe procedures to install water tanks
- identify methods used for cathodic and corrosion protection of tanks
- identify methods to calculate volume, weights and elevation pressures
|
| B-10.01.03L |
demonstrate knowledge of regulatory requirements for water tanks
- identify codes, standards and regulations for water tanks
|
| B-10.01.04L |
demonstrate knowledge of sustainability and environmental stewardship practices
- identify practices of water tank installation and securement that prevent water loss and collapse of water tank
|
Range of Variables (include, but not limited to)
- types of water tanks: gravity, pressure, below grade (underground), residential water supply, ground-level storage, break
- characteristics (water tanks): metal, plastic, wood, embankment-supported rubberized fabric (ESRF)
- types of water connections: sprinkler valves, autofill valves
B-10.02 - Installs related equipment
B-10.02 - Installs related equipment
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| B-10.02.01P |
select and use tools and equipment |
tools and equipment are selected and used according to task |
| B-10.02.02P |
install controlling devices |
controlling devices are installed on tank and in reservoirs according to AHJ, and codes, standards and regulations |
| B-10.02.03P |
install hydrants |
hydrants are installed according to AHJ, and codes, standards and regulations |
| B-10.02.04P |
install fill line |
fill line is installed to tank to allow for automatic and periodic filling of water supply tank |
| B-10.02.05P |
connect test connection and relief valve discharge |
test connection and relief valve discharge from fire pump is connected to tank to conserve water during testing procedures according to site conditions and AHJ |
| B-10.02.06P |
verify installation of anti-vortex plate |
installation of anti-vortex plate is verified to be done when required by site conditions and AHJ |
| B-10.02.07P |
install tank heating system |
tank heating system is installed according to project and manufacturers' specifications, and codes, standards and regulations |
Range of Variables (include, but not limited to)
- controlling devices: pressure switches, agitators, circulators, control valves, thermostats, check valves, autofill valves, shut-off valves
- hydrants: wall, roof, dry barrel, wet barrel
Knowledge
| Reference Code |
Learning Outcomes and Objectives |
| B-10.02.01L |
demonstrate knowledge of water tanks and related equipment, their components, characteristics, applications and operation
- identify types of water tanks and related equipment, and describe their characteristics and applications
- identify types of controlling devices, and describe their characteristics and applications
- describe operating principles of water tanks and related equipment
- interpret information about water tanks and related equipment found on drawings and specifications
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| B-10.02.02L |
demonstrate knowledge of procedures to install related equipment
- identify tools and equipment used to install related equipment, and describe their procedures for use
- identify workplace hazards, and describe safe work practices to install related equipment
- describe procedures to install related equipment
- explain supply and discharge piping requirements
- identify arrangement of fire pump suction components
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| B-10.02.03L |
demonstrate knowledge of regulatory requirements for water tanks and related equipment
- identify codes, standards and regulations for water tanks and related equipment
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Range of Variables (include, but not limited to)
- related equipment: overflow, vent, water level, drain and heating systems; access hatches; pumps
- controlling devices: pressure switches, agitators, circulators, control valves, thermostats, check valves, autofill valve, shut-off valve