ARC 8891C - Iowa Administrative Rules

Adopted and Filed

Unfired steam pressure vessels, ch 96

Untitled document

ARC 8891C

LABOR SERVICES DIVISION[875]

Adopted and Filed

Rulemaking related to unfired steam pressure vessels

The Labor Services Division hereby rescinds Chapter 96, “Unfired Steam Pressure Vessels,” Iowa Administrative Code, and adopts a new chapter with the same title.

Legal Authority for Rulemaking

This rulemaking is adopted 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 rulemaking adopts a new Chapter 96 that provides the applicable standards and the maximum allowable working pressure for unfired steam pressure vessels installed prior to July 1, 1983.

Public Comment and Changes to Rulemaking

Notice of Intended Action for this rulemaking was published in the Iowa Administrative Bulletin on November 27, 2024, as ARC 8371C. A public hearing was held on the following date(s):

●December 17, 2024

●December 19, 2024

No one attended the public hearings. No public comments were received. No changes from the Notice have been made.

Adoption of Rulemaking

This rulemaking was adopted by the Division on January 22, 2025.

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, pursuant to 875—Chapter 81.

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).

Effective Date

This rulemaking will become effective on March 26, 2025.

The following rulemaking action is adopted:

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 RFS	=	Maximum allowable working pressure, psig.
		Where:
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.
t	=	Minimum thickness of shell plates of the weakest course, in inches.
E	=	Efficiency of longitudinal joint. For riveted joints, use ASME Code, Section 1 (1971). For fusion-welded and brazed joints, use the following table:
		Single lap welded40
		Double lap welded60
		Single butt welded60
		Double butt welded75
		Forge welded70
		Brazed steel80
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.
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.

[Filed 1/24/25, effective 3/26/25]

[Published 2/19/25]

EDITOR’S NOTE: For replacement pages for IAC, see IAC Supplement 2/19/25.