North Dakota Administrative Code
Title 33.1 - Department of Environmental Quality
Article 33.1-14 - NORTH DAKOTA BOILER RULES
Chapter 33.1-14-07 - MINIATURE BOILERS - EXISTING INSTALLATIONS
Section 33.1-14-07-03 - Maximum allowable working pressure for nonstandard boilers

1. Must conform to all requirements of this chapter.

2. Must have a factor of safety as given in subsection 5 of section 33.1-14-05-02.

3. Must be given an initial inspection that must include a hydrostatic pressure test.

4. May not have solder or silver solder as a method of attachment of any pressure part of the entire assembled unit.

5. May have a plate for the North Dakota stamp and registration number to be welded to boiler proper. The plate must be placed in a conspicuous and accessible location with a minimum size thickness one-sixteenth inch [1.59 millimeters], length two inches [50.8 millimeters], and width one inch [25.4 millimeters].

6. May not exceed the design criteria limits as defined in subsection 20 of section 33.1-14-01-01.

7. Of the watertube, fired-coil and fired-radiator design must be considered as not meeting the requirements of this section.

8. Exceeding twelve inches [304.80 millimeters] internal diameter must have at least one, one inch [25.4 millimeter] opening in the bottom of the shell and one, one inch [25.4 millimeter] opening in each water leg. Boilers not exceeding twelve inches [304.80 millimeters] internal diameter must have one half inch [12.7 millimeter] opening in the shell and one half inch [12.7 millimeter] opening in each water leg.

9. Construction material used for fabrication of the shell must be steel of at least fifty-five thousand pounds per square inch [386.11 megapascals] tensile strength. Material of tubes may be steel, brass, or copper with a rating equal to materials from section 2 of the American Society of Mechanical Engineers Code.