(a) Generally.

1. (1)

   1. (A) Every manufacturer, contractor, jobber, owner, or user of a boiler or unfired pressure vessel shall obtain permission from the Boiler Inspection Division before any boiler or unfired pressure vessel may be installed or moved and reinstalled in the State of Arkansas.
   2. (B) When boilers or unfired pressure vessels are to be installed, the manufacturer’s data report for each boiler and unfired pressure vessel must be submitted with the application for installation.
   3. (C) No boiler or unfired pressure vessel may be installed without approval from the division.
   4. (D) All persons, firms, or corporations engaged in the installation of boilers, unfired pressure vessels or hot water storage tanks or fired/unfired storage water heaters two hundred thousand British thermal units per hour (200,000 Btu/hr) or greater input in any location shall be licensed by the division to perform such work pursuant to Arkansas Code § 20-23-405 and 20 CAR § 880-401 et seq.

2. (2)

   1. (A) All new and second-hand boilers and pressure vessels shall be installed and equipped to conform to the requirements of the ASME Boiler Construction Code and CSD-1 as adopted by 20 CAR § 880-701, and shall be inspected and approved by a state boiler inspector or an authorized insurance inspector before they are placed in service.
   2. (B) All such work must be performed by persons or firms possessing the requisite license.
   3. (C) Permits must be obtained for each boiler and/or pressure vessel before they may be installed.

(b) Method of support.

1. (1)

   1. (A) A horizontal-return tubular boiler over seventy-two inches (72”) in diameter shall be supported from steel hangers by the outside-suspension type of setting, independent of the boiler side walls.
   2. (B) The hangers shall be so designed that the load is properly distributed between the rivets attaching them to the shell and so that no more than two (2) of these rivets come in the same longitudinal line on each hanger.
   3. (C) The distance girthwise of the boiler from the centers of the bottom rivets to the centers of the top rivets attaching the hangers shall be not less than twelve inches (12”).
   4. (D) The other rivets used shall be spaced evenly between these points.

2. (2)

   1. (A) A horizontal-return tubular boiler, fourteen feet (14’) or more in length, or over fifty-four inches (54”) and up to and including seventy-two inches (72”) in diameter, shall be supported by the outside-suspension type of setting as specified above or at four (4) points by not less than eight (8) steel or cast iron lugs set in pairs.
   2. (B) A horizontal-return tubular boiler up to and including fifty-four inches (54”) in diameter, shall be supported by the outside-suspension type of setting as specified above, or by not less than two (2) steel or cast iron lugs on each side.
   3. (C) The distance girthwise of the boiler from the centers of the bottom rivets to the centers of the top rivets attaching the hangers shall be not less than the square of the shell diameter divided by six hundred seventy-five (675).
   4. (D) If more than four (4) lugs are used, they shall be set in four (4) pairs, the lugs of each pair to be spaced not over two inches (2”) apart and the load to be equalized between them.
   5. (E) If the boiler is supported on structural steel work, the steel supporting members must be so located or insulated that heat from the furnace cannot impair their strength.
3. (3) Lugs or hangers, when used to support a boiler of any type, shall be properly fitted to the surfaces to which they are attached.

4. (4)

   1. (A) Where it is impracticable to use rivets, studs with not less than ten (10) threads per inch may be used.
   2. (B) In computing the shearing stresses, the area at the bottom of the thread shall be used.
   3. (C) The shearing and crushing stresses on the rivets or studs used for attaching the lugs or brackets shall not exceed eight percent (8%) of the strength given in the ASME code.

5. (5)

   1. (A) Lugs, hangers, or brackets made of materials in accordance with the ASME code requirements may be attached by fusion welding providing the welding meets the requirements of the ASME code, as adopted, including stress-relieving but omitting radiographic examination, and provided that they are attached by fillet welds along the entire periphery or contact edges, of the size and form shown in the ASME code.
   2. (B) The stresses computed by dividing the total load on the lug, hanger, or bracket by the minimum cross-sectional area of the weld shall not exceed, for tension and compression, forty percent (40%), and for shear, thirty-two percent (32%), of the stress values given multiplied by the welded joint efficiency specified in the ASME code.
   3. (C) The furnace setting shall have adequate means for expansion and contraction.

(c) Settings.

1. (1)

   1. (A) Steel boilers of the wet-bottom type having an external width of over thirty-six inches (36”) shall have not less than eighteen inches (18”) between the bottom of the boiler and the floor line, with access for inspection.
   2. (B) When the width is thirty-six inches (36”) or less, the distance between the bottom of the boiler and the floor line shall not be less than six inches (6”), and when any part of the wet bottom is not farther from an outer edge than twelve inches (12”), it shall be not less than four inches (4”).
2. (2) The minimum size of the access door used in a boiler setting shall be twelve inches by sixteen inches (12” x 16”), or equivalent area, the least dimension being eleven inches (11”).