Unfired steam pressure vessels, ch 96
ARC 8371C
LABOR SERVICES DIVISION[875]
Notice of Intended Action
Proposing rulemaking related to unfired steam pressure vessels
and providing an opportunity for public comment
The Labor Services Division hereby proposes to rescind Chapter 96, “Unfired Steam Pressure Vessels,” 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 96 in accordance with the goals and directives of Executive Order 10. Proposed Chapter 96 provides the applicable standards and the maximum allowable working pressure for unfired steam pressure vessels installed prior to July 1, 1983.
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 96 and adopt the following new chapter in lieu thereof:
CHAPTER 96
UNFIRED STEAM PRESSURE VESSELS
875—96.1(89) Codes adopted by reference. The codes listed in 875—Chapter 91 apply to objects covered by this chapter.
875—96.2(89) Objects installed prior to July 1, 1983—requirements.
96.2(1) Maximum allowable working pressure.
a.The maximum allowable working pressure for code-stamped unfired steam pressure vessels will be determined in accordance with the applicable provisions of the ASME Code or American Petroleum Institute Code under which they were constructed and stamped.
b.The maximum allowable working pressure on the shell of unfired steam pressure vessels without a code stamp will be determined by the following equation:
TStE |
= |
Maximum allowable working pressure, psig. |
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Where: |
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TS |
= |
Ultimate tensile strength of shell plate(s), psig. When the tensile strength of a steel plate(s) is unknown, it shall be taken as 55,000 psig for temperatures not exceeding 650 degrees F. |
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t |
= |
Minimum thickness of shell plates of the weakest course, in inches. |
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E |
= |
Efficiency of longitudinal joint. For riveted joints, use ASME Code, Section 1 (1971). For fusion-welded and brazed joints, use the following table: |
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Single lap welded40 |
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Double lap welded60 |
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Single butt welded60 |
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Double butt welded75 |
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Forge welded70 |
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Brazed steel80 |
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R |
= |
Inside radius of the weakest course of shell or drum in inches, provided the thickness does not exceed 10 percent of the radius. If the thickness is over 10 percent of the radius, the outer radius shall be used. |
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FS |
= |
Factor of safety shall be four. |
c.The maximum allowable working pressure for unfired steam pressure vessels without an ASME stamp subjected to external or collapsing pressure will be determined by the ASME Code, Section VIII.
96.2(2) End closures. The maximum allowable working pressure permitted for formed heads under pressure will be determined by using the formulas in ASME Code, Section VIII.
96.2(3) Safety appliances. Each unfired steam pressure vessel will be protected by such safety and relief valves and indicating and controlling devices as will ensure its safe operation. Valves will not readily be rendered inoperative. The relieving capacity of safety valves will be such as to prevent a rise of pressure in the vessel of more than 10 percent above maximum allowable working pressure, taking into account the effect of static head. Safety valve discharges will be carried to a safe place.
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 875-96.1 Rule 875-96.2The 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.
Codes adopted by reference End closures Maximum allowable working pressure Objects installed prior to July 1, 1983—requirements Safety appliances© 2025 State of Iowa | Privacy Policy