Miniature power boilers installed prior to September 20, 2006, ch 93
ARC 8369C
LABOR SERVICES DIVISION[875]
Notice of Intended Action
Proposing rulemaking related to miniature power boilers
and providing an opportunity for public comment
The Labor Services Division hereby proposes to rescind Chapter 93, “Miniature Power Boilers Installed Prior to September 20, 2006,” Iowa Administrative Code, and to adopt a new chapter with the same title.
Legal Authority for Rulemaking
This rulemaking is proposed under the authority provided in Iowa Code section 89.14.
State or Federal Law Implemented
This rulemaking implements, in whole or in part, Executive Order 10.
Purpose and Summary
This proposed rulemaking rescinds Chapter 93 in accordance with the goals and directives of Executive Order 10. Proposed Chapter 93 requires certain design and operation standards for miniature power boilers installed prior to September 20, 2006.
Regulatory Analysis
A Regulatory Analysis for this rulemaking was published in the Iowa Administrative Bulletin on September 18, 2024. A public hearing was held on the following date(s):
●October 22, 2024
Fiscal Impact
This rulemaking has no fiscal impact to the State of Iowa.
Jobs Impact
After analysis and review of this rulemaking, no impact on jobs has been found.
Waivers
Any person who believes that the application of the discretionary provisions of this rulemaking would result in hardship or injustice to that person may petition the Division for a waiver of the discretionary provisions, if any.
Public Comment
Any interested person may submit written or oral comments concerning this proposed rulemaking, which must be received by the Division no later than 4:30 p.m. on December 19, 2024. Comments should be directed to:
Mitchell Mahan |
Public Hearing
Public hearings at which persons may present their views orally or in writing will be held as follows:
December 17, 2024 |
Ledges Conference Room |
December 19, 2024 |
Lake Conference Room |
Persons who wish to make oral comments at a public hearing may be asked to state their names for the record and to confine their remarks to the subject of this proposed rulemaking.
Any persons who intend to attend a public hearing and have special requirements, such as those related to hearing or mobility impairments, should contact the Division and advise of specific needs.
Review by Administrative Rules Review Committee
The Administrative Rules Review Committee, a bipartisan legislative committee which oversees rulemaking by executive branch agencies, may, on its own motion or on written request by any individual or group, review this rulemaking at its regular monthly meeting or at a special meeting. The Committee’s meetings are open to the public, and interested persons may be heard as provided in Iowa Code section 17A.8(6).
The following rulemaking action is proposed:
ITEM 1.Rescind 875—Chapter 93 and adopt the following new chapter in lieu thereof:
CHAPTER 93
MINIATURE POWER BOILERS INSTALLED PRIOR TO SEPTEMBER 20, 2006
875—93.1(89) Scope.
93.1(1) This chapter sets forth requirements in addition to those contained in 875—Chapter 92 for boilers that:
a.Have a heating surface of 20 square feet or less;
b.Have a gross volume of 5 cubic feet or less, excluding casing and insulation;
c.Have an inside shell diameter of 16 inches or less;
d.Have 100 psig maximum allowable working pressure; and
e.Were installed prior to September 20, 2006.
93.1(2) For objects covered by this chapter, if there is a conflict between this chapter and 875—Chapter 92, this chapter shall govern the issue.
875—93.2(89) Code adopted by reference. The current edition of the National Board Inspection Code adopted by reference in rule 875—91.1(89) applies to objects covered by this chapter.
875—93.3(89) Maximum working pressure. The maximum allowed working pressure is to be determined by rule 875—92.3(89).
875—93.4(89) Safety valve requirements. Boilers covered by this chapter will be equipped with a sealed spring-loaded pop safety valve of not less than ½-inch pipe size. The minimum relieving capacity of the safety valve will be determined in accordance with rule 875—92.6(89). In addition to these requirements, the safety valve will have sufficient capacity to discharge all the steam that can be generated by the boiler without allowing the pressure to rise more than 6 percent above maximum allowable working pressure.
875—93.5(89) Steam stop valves. Each steam line from a miniature power boiler shall be provided with a stop valve located as close to the boiler shell or drum as is practicable except when the boiler and steam receiver are operated as a closed system.
875—93.6(89) Water gage requirements.
93.6(1) Miniature power boilers for operation with a definite water level will be equipped with a glass water gage for determining the water level. The lowest permissible water level for vertical boilers will be at a point one-third of the height of the shell above the bottom head or tube sheet. When the boiler is equipped with an internal furnace, the water level will not be less than one-third of the length of the tubes above the top of the furnace tube sheet. In the case of small boilers operated in a closed system where there is insufficient space for the usual glass water gage, water level indicators of the glass bull’s eye type may be used.
93.6(2) Miniature power boilers will have the lowest visible part of the water gage glass located at least 1 inch above the lowest permissible water level specified by the manufacturer.
875—93.7(89) Feedwater supply requirements.
93.7(1) Except for miniature power boilers operating without the extraction of steam, miniature power boilers will be provided with at least one feed pump or other feeding device unless the boiler feed line is connected to a water main carrying sufficient pressure to feed the boiler. In the latter case, in lieu of a feeding device, a suitable connection or opening will be provided to fill the boiler when cold. Such connection will be no less than ½-inch pipe size for iron or steel pipe and ¼-inch for brass or copper pipe.
93.7(2) The feed pipe will be provided with a check valve and a stop valve of a size not less than that of the pipe. The feed water may be delivered through the blowoff opening if desired.
875—93.8(89) Blowoff. Miniature power boilers shall be equipped with a blowoff connection, not less than ½-inch pipe size, located to drain from the lowest water space practicable. The blowoff shall be equipped with a valve or cock not less than ½-inch pipe size.
875—93.9(89) Washout opening requirements.
93.9(1) Miniature power boilers exceeding 12 inches internal diameter or having more than 10 square feet of heating surface will be fitted with not less than three brass washout plugs of 1-inch pipe size that will be screwed into openings in the shell near the bottom. In miniature power boilers of the closed type system heated by removable internal electric heating elements, the openings for these elements when suitable for cleaning purposes may be substituted for washout openings. Boilers not exceeding 12 inches internal diameter and having less than ten square feet of heating surface need not have more than two 1-inch openings for cleanouts, one of which may be used for the attachment of the blowoff valve; these openings will be opposite each other where possible. All threaded openings will be opposite each other where possible. All threaded openings in the boiler will be provided with a riveted or welded reinforcement to give four full threads therein.
93.9(2) Electric boilers of a design employing a removable top cover flange for inspection and cleaning need not be fitted with washout openings.
875—93.10(89) Fixtures and fittings. All valves, pipe fittings, and appliances connected to a miniature power boiler shall be equal to at least the minimal requirements of the construction or installation code and shall be rated for not less than the maximum allowable working pressure of the miniature power boiler. In no case shall the rating be for less than 125 pounds.
These rules are intended to implement Iowa Code chapter 89.
This notice is now closed for comments. Collection of comments closed on 12/19/2024.
The official published PDF of this document is available from the Iowa General Assembly’s Administrative Rules page.
View the Iowa Administrative Bulletin for 11/27/2024.
The following administrative rule references were added to this document. You may click a reference to view related notices.
Rule 875-91.1 Rule 875-92.3 Rule 875-92.6 Rule 875-93.1 Rule 875-93.10 Rule 875-93.2 Rule 875-93.3 Rule 875-93.4 Rule 875-93.5 Rule 875-93.6 Rule 875-93.7 Rule 875-93.8 Rule 875-93.9The following Iowa code references were added to this document. You may click a reference to view related notices.
Iowa Code 89The following keywords and tags were added to this document. You may click a keyword to view related notices.
Blowoff Code adopted by reference Feedwater supply requirements Fixtures and fittings Maximum working pressure Safety valve requirements Scope Steam stop valves Washout opening requirements Water gage requirements© 2025 State of Iowa | Privacy Policy