Current through September 24, 2024
(1) These rules
apply to "historic power boilers" as defined in Rule
0800-03-03-.01(18).
(2) Historic power boilers shall receive
prior authorization from the Chief Inspector or Chief Inspector's Designee
before entry and operation of the boiler in the state of Tennessee. Prior to
entering the State with the boiler, the owner or user shall submit the proper
Board approved application for operation of a historic power boiler.
(a) For historic power boilers located in the
State, the owner or user shall be required to submit the initial application as
long as he possesses a current Tennessee certificate of inspection. If the
Tennessee certificate of inspection expires, the owner or user shall reapply to
the Chief Inspector or Chief Inspector's Designee for permission to
operate.
(b) For historic power
boilers located outside of the State, with a valid Tennessee certificate of
inspection, the owner or user is allowed to freely operate their boiler at
events within the State. As long as the boiler has a valid Tennessee
certificate of inspection, there is no need to reapply for permission to
operate. If the Tennessee certificate of inspection remains expired for more
than sixty (60) days without an inspection, or if the owner chooses to no
longer operate the boiler or retain a Tennessee certificate of inspection, the
boiler shall be placed in dormant status. If at any time the boiler is placed
in dormant status, the owner or user shall reapply with the Chief Inspector or
Chief Inspector's Designee for permission to operate.
(3) Design and Testing.
(a) For all traditional historic power
boilers, both standard and nonstandard, and nontraditional nonstandard historic
power boilers, the owner or user shall supply the Chief Inspector or Chief
Inspector's Designee with reports of the maximum allowable working pressure
calculations and ultrasonic testing at the time of application to operate. The
calculations and ultrasonic testing shall be completed by a knowledgeable
individual familiar with the practice. All report results are subject to the
acceptance of the Chief Inspector or Chief Inspector's Designee at time of
application.
(b) A copy of the
Manufacturer's Data Report shall accompany all applications to operate
nontraditional standard historic power boilers in the State.
(c) The Chief Inspector or Chief Inspector's
Designee or Deputy Inspector may at anytime during the application and
inspection process request additional information, such as, but not limited to,
design, material, inspection or testing.
(4) Traditional Historic Power Boilers.
(a) The maximum allowable working pressure
shall be calculated with a minimum safety factor of five (5) for standard, and
five point five (5.5) for traditional nonstandard historic power boilers, using
the formula for historic power boilers in paragraph (14) of this rule, not to
exceed 125 psig.
(b) The minimum
safety factor shall be six point five (6.5) for traditional historic power
boilers having lap-riveted longitudinal joints. The maximum allowable working
pressure should not exceed 100 psig. Seal welding of a lap-riveted longitudinal
joint is not permitted.
(5) Nontraditional Historic Power Boilers.
(a) All nontraditional historic power boilers
constructed after the effective date of this rule shall be constructed in
accordance with Rule 0800-03-03-.03. Nontraditional
nonstandard historic power boilers, free-lance or scale models, constructed
after the effective date of this rule shall not be allowed to operate in the
State.
(b) The maximum allowable
working pressure for nontraditional standard historic power boilers shall be
determined in accordance with the applicable provisions of the edition of the
ASME Code under which they were constructed.
(c) The maximum allowable working pressure
shall be calculated with a minimum safety factor of five point five (5.5) for
nontraditional nonstandard historic power boilers, using the formula for
historic power boilers in paragraph (14) of this rule, not to exceed 125
psig.
(d) Nontraditional
nonstandard historic power boilers having lap-riveted longitudinal joints shall
not be allowed to operate in the State.
(6) An annual inspection of all historic
power boilers shall be conducted by a Deputy Inspector. The issuance of the
annual Tennessee certificate of inspection shall be based on the results of the
annual inspection.
(7) Operational
Log.
(a) The owner of a historic power boiler
operating in the State shall possess a bound operational log. After successful
completion of the initial inspection by a Deputy Inspector, the owner shall be
provided with a registered operational log book by the Chief Inspector or Chief
Inspector's Designee. The operational log shall contain, but is not limited to,
the following:
1. The operation date of the
historic power boiler;
2. The
length of time the historic power boiler was operated;
3. Location where operated (city and
state);
4. Jurisdictional
inspection dates with the signature and commission number of
inspector;
5. Description of
repairs and alterations, including the dates, with signature and commission
number of inspector;
6. Testing
performed and by whom (e.g., pressure test, ultrasonic test, radiographic test,
etc.);
7. Change of ownership,
including the date the historic power boiler changed ownership and to whom;
and
8. The front page of the
operational log shall include a page number index of all inspections, inspector
instructions, and repairs or incidents involved with the historic power
boiler.
(b) Operational
logs shall be available to the inspector at all times the historic power boiler
is to be operated in the State. Operational logs that are lost or misplaced
shall be reported to the Chief Inspector or Chief Inspector's Designee
immediately. The owner or user of the historic power boiler shall be
responsible for the cost of the operational log replacement. Failure to possess
or report a lost or misplaced operational log, may prevent the historic power
boiler from operating in the State or revoking of the Tennessee certificate of
inspection.
(c) Whenever the pages
of an operational log have been completely filled, the owner shall request a
supplemental operational log from the Chief Inspector or Chief Inspector's
Designee no cost to the owner. The owner is responsible for retaining all
operational logs, initial and supplemental, for the life of the historic
boiler. In the event that ownership of the historic power boiler changes, the
new owner shall receive all original operational logs, initial and
supplemental, from the previous owner. The previous owner may make a copy of
the operational logs for his records.
(8) A pressure test with water temperature
between 60° to 120° F, and not to exceed ninety percent (90%) of the
set pressure of the lowest setting pressure relief device on the boiler, held
for a period of at least thirty (30) minutes may be conducted at the discretion
of the Deputy Inspector.
(9) All
historic power boilers shall be equipped with an ASME stamped NB rated safety
valve of adequate capacity, together with a water level indicator, calibrated
pressure gauge and two (2) suitable means of introducing water into the
boiler.
(10) The historic power
boilers, traditional and nontraditional, shall be equipped with a fusible plug.
All fusible plugs shall be constructed to meet the requirements of the ASME
Code.
(a) Fusible plugs shall be located at
the lowest permissible water level as determined by the boiler manufacturer or
the Chief Inspector or Chief Inspector's Designee when this information is not
available.
(b) Fireside fusible
plugs shall protrude at a minimum of one (1) inch into the water.
(c) Waterside fusible plugs shall not
protrude into the fire area more than one (1) inch.
(d) Fusible plugs shall not be
refilled.
(e) All fusible plugs
shall be removed for inspection once every two (2) years.
(f) All fusible plugs shall be replaced after
three hundred (300) hours of service with a new fusible plug constructed to
meet the requirements of the ASME Code.
(g) The date when the fusible plug is removed
for inspection or replaced shall be documented in the owner's operational
log.
(11) All historic
power boilers shall be equipped with operational tri-cocks, a gauge glass and
pressure gauge. A siphon, or water seal, shall be installed between the
pressure gauge and boiler. All pressure gauges shall be proven accurate at the
time of the annual inspection by testing or documentation of
calibration.
(12) Repairs and
Alterations.
(a) Any welded code repair or
any alteration shall be performed by organizations holding a valid NB "R"
stamp. If the repair or alteration is performed in this State, the "R"
stamp-holder shall have a current State of Tennessee Boiler Erectors and
Repairers Contractor's license.
(b)
Mechanical code repairs to historic power boilers such as, but not limited to,
tube, rivet and stay replacement may be completed by the owner, or his
designee, who is knowledgeable about the repair to be performed with prior
approval of the Chief Inspector or Chief Inspector's Designee.
(c) All repairs and alterations, welded and
mechanical, shall be inspected by an inspector and documented on the applicable
NB "NB-R" form. The "NB-R" form shall be submitted and kept on file in the
Chief Inspector's or Chief Inspector's Designee's office.
1. For those repairs and alterations
performed in the State, a Deputy Inspector shall perform the
inspection.
2. For repairs and
alterations performed outside of the State, the inspection shall be performed
by a NB commissioned boiler inspector.
3. All repairs and alterations shall be
documented in the owner's operational log and signed by the inspector who
performed the inspection.
(13) All standard historic power boilers
shall have legible stamping clearly visible to the inspector.
(14) Maximum Allowable Working Pressure for
Nonstandard Historic Power Boilers.
(a) The
maximum allowable working pressure of a historic power boiler shall be
determined in accordance with the following formula:
Click to view
Image
Where:
TS=ultimate tensile strength
of shell plate, pounds per square inch (psi)
t=minimum thickness
of shell plate, in weakest course (inches)
E=efficiency of
longitudinal joint [For tube ligaments and pitch, determine E in accordance
ASME Code, Section I. For riveted construction, refer to the National Board
Inspection Code, 1973 edition. For seamless construction , consider E to be one
hundred percent (100%).]
R=inside radius of weakest course of
shell (inches)
FS=factor of safety [See subparagraph (a) of
paragraph (4) and subparagraph (c) of paragraph (5) of this rule]
(b) Tensile Strength. When the
tensile strength of steel or wrought iron shell plates is not known, it shall
be taken as 55,000 psi for steel and 45,000 psi for wrought iron.
(c) Crushing Strength of Mild Steel. The
resistance to crushing of mild steel shall be taken as 95,000 psi.
(d) Strength of Rivets in Shear. When
computing the ultimate strength of rivets in shear, the following values in psi
of the cross-sectional area of the rivet shank shall be used:
|
|
PSI
|
|
Iron rivets in single
shear
|
38,000
|
|
Iron rivets in double shear
|
76,000
|
|
Steel rivets in single shear
|
44,000
|
|
Steel rivets in
double shear
|
88,000
|
(When the diameter of the rivet holes in the
longitudinal joints of a boiler is not known, the diameter and cross-sectional
area of rivets, after driving, may be selected from Table 1, or as ascertained
by cutting out one (1) rivet in the body of the joint.)
Table
1
Sizes of Rivets Based on Plate Thickness
|
Thickness
|
1/4
|
9/32
|
5/16
|
11/32
|
3/8
|
13/32
|
|
of plate
|
|
|
|
|
|
|
|
(inches)
|
|
|
|
|
|
|
|
Diameter
|
|
|
|
|
|
|
|
of rivet
|
|
|
|
|
|
|
|
after
|
11/16
|
11/16
|
3/4
|
3/4
|
13/16
|
13/16
|
|
driving
|
|
|
|
|
|
|
|
(inches)
|
|
|
|
|
|
|
|
Thickness
|
|
|
|
|
|
|
|
of plate
|
7/16
|
15/32
|
1/2
|
9/16
|
5/8
|
|
|
(inches)
|
|
|
|
|
|
|
|
Diameter
|
|
|
|
|
|
|
|
of rivet
|
|
|
|
|
|
|
|
after
|
15/16
|
15/16
|
15/16
|
1-1/16
|
1-1/16
|
|
|
driving
|
|
|
|
|
|
|
|
(inches)
|
|
|
|
|
|
|
(e) The
working pressure may be decreased by the inspector, with authorization of the
Chief Inspector or Chief Inspector's Designee, if the condition and safety of
the boiler warrant.
Authority:
T.C.A. §§
68-122-102,
68-122-104,
and
68-122-202.
