Construction Codes and
Licensing, Boiler Division
Boiler Inspection Requirements
Joel T. Amato
Chief Boiler Inspector
Boiler Division
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Established in 1881, 133 years old
Regulate the Construction, Installation, and
Inspection of Boilers and Pressure Vessels
Boats for hire
Historical Boilers
Manufacturers and Repair Firms
Boiler Division
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10- Inspectors
78,736- Boilers and Pressure Vessels
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Approximately 20,000 boilers
242- Historical Boilers
103- Boats
78- ASME / National Board Stampholders
Boilers
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Steam boilers over 100,000 btu input
HWH boilers over 750,000 btu input
HWS boilers over 500,000 btu input
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Built to ASME Code
Registered with the National Board
Compliance with ASME CSD-1 required
All new installations of steam and HWH boilers
must be hydrostatically tested after installation is
complete and before boiler is put in operation.
Test must be witnessed by a State inspector.
Hydrostatic test requirements do not apply to
HWS.
Pressure Vessels
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Inspection Required
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Air storage greater than 5 cubic feet (38 gallons)
or 100 psi
Air storage greater than 1.5 cubic feet (11.22
gallons) and 600 psi
Other tanks over that exceed 210 degrees, 160
psi, or 120 gallons
Possible changes to Section VIII, for pressure
vessels
Manufacturers and Repair Firms
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ASME Code Shops
National Board “R” Stamp Holders
Triennial Audits
Why do we inspect?
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https://www.youtube.com/watch?v=JsoE4F2
Pb20
https://www.youtube.com/watch?v=jbreKn4P
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CF-190 Vents, Bleeds, and Relief valve
lines
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Vent Lines: piping or tubing that conveys the
release of gases from fuel train components
Bleed Lines: piping or tubing that conveys the
release of gases from fuel train components,
which periodically releases gas pressure to
the atmosphere in order to operate properly
Relief Valve Lines: piping or tubing that
conveys the release of gas from the relief
valve
CF-190 Vent Lines
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Gas-pressure regulators, combination gas
controls, pressure interlock switches, and
all other fuel train components requiring
atmospheric pressure to balance a
diaphragm shall have the atmospheric
side of the diaphragm connected to a vent
line that shall be piped by the installer to
the outdoors at a safe point of discharge
as determined by the AHJ.
CF-190 Bleed Lines
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Gas-pressure regulators, combination gas
controls, pressure interlock switches, and
all other fuel train components that
periodically release gas into the
atmosphere in order to properly operate
shall be connected to a bleed line that
shall be piped by the installer to the
outdoors at a safe point of discharge as
determined by the AHJ.
CF-190 Vent Limiters
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Gas pressure regulators,
combination gas control, pressure
interlock switch, or other fuel train
components incorporating a vent
limiter shall be permitted to vent
directly into ambient space.
CF-190 Gas Pressure Relief Lines
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Outlets of gas pressure relief valves shall
be piped by the installer to the outdoors
at a safe point of discharge as
determined by the AHJ.
Piping must be the same size or greater
than the outlet connection to the valve
Multiple relief lines must be piped
independently
CF-190 Vent Valve lines
Vent Valve: A normally open, power
closed valve piped between the two
safety shutoff valves.
 Must be piped outdoors by installer
 Piping must be full size for the entire
length
 Multiple lines must be piped
seperately
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CF-190 Manifolding Lines
Must be approved by AHJ
 Shall have cross sectional area of the
largest branch line plus 50% of the
additional cross sectional area of
additional lines
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CF-190 Manifolding lines
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The following is not permitted
Manifolding gas-pressure relief lines
 Manifolding of vent valve lines with vent
lines or bleed lines
 Manifolding of any vent, bleed, relief, or
vent valve lines of one boiler unit to any
lines from another boiler
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CF-190 Vents, Bleeds, etc.
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Combination gas control integrating an
internal gas bleed line shall be permitted to
discharge its bleed line back into the valve
body
Piping or line point of discharge shall be
protected from foreign material, moisture, or
insects
Bleed or vent lines may discharge to a
continuous pilot, not manifolded and point of
discharge uses a burner tip
Code Facts, Section IV
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ASME Certification Mark
“H” Designator for shop/field assembled
boilers
Use of Stainless Steel (HF-201)
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Limited to 210 degrees Maximum Temperature
Safety valve mounting
Section IV Boilers
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Hamilton Engineering (EVO Boilers)
Section IV Boilers (EVO Boilers)
Section IV Boilers (Viessmann)
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Must Comply with ANSI Z21.13 or CSD-1
Observation port for burner and main flame
Vitodens 200-W
Section IV Boilers (Viessmann)
ANSI Z 21.13
 1.6.14
Provision shall be made to permit observation of main
burner flames during adjustment and under operating
conditions.
 1.6.15
A flame observation port of a direct vent boiler shall be
constructed of heat resistant material and, unless
located within the cabinet casing, shall be protected from
mechanical damage. Glass, if used, shall be
framed and not less than 1/8 in (3.2 mm) thick.
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Section IV Boilers (Fulton Pulse)
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Gems Sensors, Probe type LWCO
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Does not prove lockout, resets after 60 second
test.
Under Review by CSD-1 Committee
Section IV Boilers (Aerco)
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Combustion Air Proving Switch
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Must be tested by AERCO trained Technician
Test performed at start up
High Temp Limit Switch
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New sensors eliminate over temperature prior to
shutting off fuel supply to burner
Section IV Boilers (Aerco)
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Gas Pressure Regulator Cracks
Section IV Boilers, (Aerco)
Section IV Boilers, (Weil Mclain)
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Lowest visible part of the gage glass shall be at least 1”
above the the lowest permissible water level
recommended by the manufacturer. HG-603
Section IV Boilers, Patterson Kelley
Section IV Boilers, Patterson Kelley
Section IV Boilers, Patterson Kelley
Important Dates
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1957: ASME Code
1982: NBIC
1984: CSD-1, 1982 Edition
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Steam: 2 LWCO
Steam: High Pressure Limit, Manual Reset
HWH: LWCO with Manual Reset
HWH: High Temp limit with Manual Reset
1993: E-Stop
1994: National Board Registration
Current Edition Adopted: 2012
Inspection Reports
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Electronic Transfer, 75%
Violation Tracking
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Must be written out
Each Report must have one of these
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MNB (State Reg No / Jurisdiction No)
NB (National Board Number)
Serial No, or Other No
CSD-1, CW-520
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Water heater
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A vessel which is closed except for openings
through which water can flow, that includes the
apparatus by which heat is generated and on
which all controls and safety devices necessary to
prevent pressure greater than 160 psig and water
temperatures greater than 210 degrees F are
provided, in which potable water is heated by the
combustion of fuels, electricity or any other heat
source withdrawn for external use.
CSD-1, CW-520
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Hot water supply boiler
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A boiler that furnishes hot water to be used
externally to itself at a pressure less than or equal
to 160 psig or a temperature less than or equal to
250 degrees F at or neat the boiler outlet.
ASME Code Section IV
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Limits Temperature of Water Heaters to 210
degrees F, and 160 psi (HLW stamp)
CSA vs AMSE/NB Capacity
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http://www.nationalboard.org/SiteDocuments/
Bulletins/WI2014.pdf
NB Bulletin, Winter 2014
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Which capacity should be used? The answer:
match the code of construction with the
certified capacity rating. If the valve is
protecting an ASME Section IV codestamped hot water heater, then use the
ASME/National Board capacity which is
determined by ASME Section IV
requirements. If it is not ASME Section IV
code stamped, then use the CSA rating.
Commission Continuing Education
Commission Continuing Education
Website
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http://www.dli.mn.gov/Ccld.asp
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Email: joel.amato@state.mn.us
Phone: 651-284-5137
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