Iowa Administrative Code

of objects in Iowa. To the extent they do not conflict with the definitions contained in Iowa Code chapter 89, the definitions in this rule are applicable to the rules contained in 481—Chapters 390 through 395. “Active status” means an object is physically attached to the system …

Iowa Code chapter 89, the definitions in this rule are applicable to the rules contained in 481—Chapters 390 through 395. “Alteration” means a change in the object described on the original manufacturer’s data report that affects the pressure-retaining capability of the pressure-…

number. State inspectors and special inspectors shall assign identification numbers as directed by the department to all jurisdictional objects that lack numbers. Identification numbers shall be attached in plain view to the object using one of the following methods: 1. A yellow …

390.4(1) Preparation of objects. Each owner or user shall ensure that each object covered by Iowa Code chapter 89 is prepared for inspection pursuant to this rule. 390.4(2) Confined space and lockout, tagout procedures. a. If an object is a non-permit-required confined space or a…

390.5(1) General. All boilers and unfired steam pressure vessels covered by Iowa Code chapter 89 are inspected according to the requirements of the National Board Inspection Code (2021), which is hereby adopted by reference. A department inspector or special inspector must perfor…

390.6(1) Special inspector commission fee. A $55 fee shall be paid annually to the director to obtain a special inspector commission pursuant to Iowa Code section 89.7. 390.6(2) Certificate fee. A $40 fee shall be paid for each one-year certificate, an $80 fee shall be paid for e…

certificate to operate. A certificate to operate will not be issued until the boiler or pressure vessel is in compliance with the applicable rules and all fees have been paid. The current certificate to operate or a copy of the current certificate to operate shall be conspicuousl…

390.8(1) Definition of “reputable insurance company.” As used in this rule, “reputable insurance company” means a company recognized by the Iowa insurance division as a licensed insurer, a risk retention group, an alien surplus lines insurer, or a surplus lines insurer. 390.8(2) …

390.9(1) An entity that manufactures or repairs boilers, pressure vessels or related equipment may request quality reviews, surveys or audits from certifying organizations such as the ASME or the National Board. The department is authorized to conduct the quality reviews, surveys…

391.1(1) ASME boiler and pressure vessel codes adopted by reference. The ASME Boiler and Pressure Vessel Code (2021), including Code Cases, is adopted by reference. Regulated objects shall be designed and constructed in accordance with the ASME Boiler and Pressure Vessel Code (20…

391.10(1) Notice concerning other rules. The division and the Iowa department of public safety both enforce requirements concerning air and ventilation. Objects that are covered by both sets of rules must comply with both sets of rules. 391.10(2) Documentation. Documentation of c…

vents or a vent and overflow pipe to protect against a loose float plugging a single connection. [ARC 8894C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

construction or installation code. [ARC 8894C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

the unit including but not limited to the manufacturers’ data report, drawings, parts lists, installation manuals, and operating manuals shall be in English, and all measurements in U.S. customary units. All pressure gages, thermometers and other controls and safety devices shall…

objects shall be registered with the National Board. [ARC 8894C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

utilized in a manner inconsistent with the stamp. [ARC 8894C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25] These rules are intended to implement Iowa Code chapter 89. [Filed emergency 12/26/97 after Notice 11/19/97—published 1/14/98, effective 1/1/98] …

391.2(1) No person shall remove, disable or tamper with a required safety appliance except for the purpose of repair or inspection. 391.2(2) An object shall not be operated unless all required and installed safety appliances are properly functional and operational. [ARC 8894C, IA…

blowdown that is considered a hazard to life or property shall pass through blowoff equipment that will reduce pressure and temperature. The temperature of the water leaving the blowoff equipment shall not exceed 150 degrees F. If the local jurisdiction has a temperature limit of…

valves, blowoff pipes and other outlets shall comply with the following: 391.4(1) The discharge piping terminates at a safe point of discharge. 391.4(2) When the safety valve or temperature and pressure relief valve discharge is piped away from the object to a safe point of disch…

galvanic action shall not be used on objects covered by these rules. Dielectric fittings shall be used where dissimilar metals are joined. [ARC 8894C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

unfired steam pressure vessel shall involve replacement of more than 50 percent of the OEM’s pressure- retaining boundary. [ARC 8894C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

evaporators, superheaters, or reheaters. 391.7(1) General requirements. a. Leaky tubes are replaced or plugged. b. Tube plugs are made of a material that is compatible with the material of the boiler tube being plugged and shall be welded into place or manufactured to be expanded…

subrule 391.10(1). 391.8(1) Clearance requirements. a. This paragraph applies to objects installed after December 1, 2022. Minimum clearance on all sides of objects will be 36 inches, or the manufacturer’s recommended service clearances if they allow sufficient room for inspectio…

high consistent with applicable federal safety regulations. [ARC 8894C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

installed on and after September 20, 2006. 481—Chapter 393 applies to miniature power boilers installed prior to September 20, 2006. [ARC 8888C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

1, 1983. Each steam outlet from a boiler, except safety valve and water-column connections, will be fitted with a stop valve located as close as practicable to the boiler. When a stop valve is so located that water can accumulate, ample drains will be provided. The drainage will …

July 1, 1983. Each boiler will have a blowoff pipe fitted with valve or cock, in direct connection with the lowest water space practicable. 392.11(1) When the maximum allowable working pressure exceeds 125 psig, the blowoff pipe will be at least schedule 80 from the boiler to the…

covered by this chapter. [ARC 8888C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25; Editorial change: IAC Supplement 7/9/25]

boilers installed prior to July 1, 1983. A boiler constructed with fusion-welded seams and not radiographed and stress relieved during construction shall not be operated at a pressure in excess of 15 pounds per square inch. Boilers with fusion-welded seams that are radiographed a…

mud drums. This rule applies to power boilers installed prior to July 1, 1983. 392.4(1) Tube boiler. The maximum allowable working pressure on a watertube boiler, the tubes of which are secured in cast iron or malleable iron headers or that have cast iron mud drums, will not exce…

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, shall be selected from ASME Code, Section I (1971). [ARC 8888C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/2…

1983. 392.6(1) The use of weighted-lever safety valves or safety valves having either the seat or disk of cast iron is prohibited. All power boilers will have direct, springloaded, pop-type safety valves that conform to the construction or installation code. 392.6(2) Each boiler …

1983. 392.7(1) Each boiler will have a feed supply that will permit it to be fed at any time while under pressure. A boiler having more than 500 square feet of water-heating surface will have at least two means of feeding, one of which will be an approved feed pump, injector, or …

July 1, 1983. Outlet connections that allow the escape of an appreciable amount of steam or water will not be placed on the piping. However, this rule does not prohibit the installation of damper regulators, feed water regulators, low-water fuel cutouts, drains, or steam gages. T…

1983. Each boiler will have a pressure gage so located that the gage is readable. The pressure gage will be installed so that it will at all times indicate the pressure in the boiler. Each steam boiler will have the pressure gage connected to the steam space or to the water colum…

393.1(1) This chapter sets forth requirements in addition to those contained in 481—Chapter 392 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…

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. [ARC 8889C…

adopted by reference in rule 481—391.1(89) applies to objects covered by this chapter. [ARC 8889C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

determined by rule 481—392.3(89). [ARC 8889C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

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 481—392.6(89). In addition to these requirements, the safety valve will have sufficient capacity to discharge all the st…

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. [ARC 8889C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

393.6(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 he…

393.7(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 bo…

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. [ARC 8889C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]

393.9(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 miniatu…

394.1(1) Steam boilers for operation at pressures not exceeding 15 psig; 394.1(2) Hot water heating boilers for operation at pressures not exceeding 160 psig or temperatures not exceeding 250 degrees F at or near the boiler outlet; 394.1(3) Hot water supply boilers. [ARC 8890C, I…

covered by this chapter. [ARC 8890C, IAB 2/19/25, effective 3/26/25; Editorial change: IAC Supplement 7/9/25]