0800-03-03-.09
Requirements For Fire Jacketed Steam Kettles
Cite as Tenn. Comp. R. & Regs. 0800-03-03-.09
(1)
Fired Jacketed Steam Kettles. Fired jacketed steam kettles may be constructed in
accordance with ASME Code, Section VIII, provided the following requirements are met:
(a)
Welded joints in contact with products of combustion shall be of Type No. 1 of Table
UW-12, ASME Code, Section VIII.
(b)
When parts subjected to pressure are made of carbon steel material, the minimum
thickness shall be one fourth (1/4) inch. The minimum thickness of stainless steel or
nonferrous pressure parts shall be as specified in the applicable part of ASME Code,
Section VIII, Subsection C.
(c)
When in contact with products of combustion, carbon steel material shall be pressure
vessel quality and austenitic stainless steel parts shall be either extra-low carbon or
stabilized grades.
(d)
Structural grade carbon steel shall not be used for any pressure part.
(e)
The operating pressure of the jacket shall not exceed 50 psig.
(f)
Vessels constructed under this rule shall be inspected by an authorized inspector.
Such vessels marked with the UM Symbol are not acceptable.
(g)
No steam or water shall be withdrawn from the jacket for use externally to the vessel.
BOILER INSPECTIONS
CHAPTER 0800-03-03
(h)
The capacity of the safety valve in pounds of steam per hour shall be at least equal to
the BTU rating of the burner divided by one thousand (1000).
(i)
The jacket shall be equipped with the following minimum appurtenances and controls:
1.
A pressure gauge;
2.
A water gauge glass;
3.
A separate connection, fitted with a check valve and stop valve, for adding water
to the jacket;
4.
An automatic gas valve controlled by pressure or temperature to maintain the
steam pressure in the jacket below the safety valve setting;
5.
A low water cutoff that will cut off the fuel to the burner if the water in the jacket
drops below the lowest permissible water level as established by the
manufacturer; and
6.
A safety pilot control that will cut off the fuel to both the main burner and the pilot
burner in case of pilot flame failure.