MHLW

Several Certification schemes when exporting Boiler/Pressure vessel to Japan

Q) I wish to export “pressure equipment” to Japan. What examinations/certificates are required?
A) The Japanese government categorized applicable laws by product classifications and its usage as below.

Inspection of Boiler/Pressure vessel under Industrial safety and health act (MHLW Inspection)

Product : Boiler, Small-sized boiler, Class 1 pressure vessel, Small-sized pressure vessel, Class 2 pressure vesselwhich are manufactured outside Japan
Applicable law : Industrial Safety and Health Act
Ministry in charge : Ministry of Health, Labour and Welfare (MHLW)
Inspection body : Designated Foreign Inspection Agency
Inspection criteria : Construction code for boiler / Construction code for pressure vessel / Japanese Industrial Standard(JIS)

Inspection scope
1) Design review
2) Manufacturing inspection

Product Category and definition
  • Boiler
    the term "boiler" means a steam boiler or a hot water boiler other than boilers listed below:(a) Steam boilers used at a gauge pressure of 0.1 MPa or less with a heating surface area calculatedas provided for by the Ordinance of the Ministry of Health, Labour and Welfare of 0.5 m2 or less orwith a drum having an inner diameter of 200 mm or less and a length of 400 mm or less;(b) Steam boilers used at a gauge pressure of 0.3 MPa or less with an internal cubic volume of 0.0003 m3 or less;(c) Steam boilers with a heating surface area of 2 m2 or less fitted with a steam pipe having an innerdiameter of 25 mm or more open to the atmosphere, or fitted with a U-shaped vertical pipe having agauge pressure of 0.05 Mpa or less and an inner diameter of 25 mm or more at the steam generating section;(d) Hot water boilers with a gauge pressure of 0.1 MPa or less with a heating surface area of 4 m2 or less;(e) Once-through boilers (excluding those of multi-pipe type with a header having an inner diameter exceeding 150 mm) used at a gauge pressure 1 MPa or less with a heating surface area of 5 m2 or less (for those boilers with steam separator, limited to the said steam separator having an inner diameter of 200 mm or less and an internal cubic volume of 0.02 m3 or less);(f) Once-through boilers with an internal cubic volume of 0.004 m3 or less (limited to those boilers without both a header and a steam separator)and the product of the maximum operating pressure gauge expressed in MPa multiplied by the internal cubic volume expressed in m3 are 0.02 or less.
  • Small-sized boilier
    Steam boilers used at a gauge pressure of 0.1 MPa or less with a heating surface area of 1 m2 or less or a drum having an inner diameter of 300 mm or less and a length of 600 mm or less;Steam boilers with a heating surface area of 3.5 m2 or less and a steam pipe having an inner diameter of 25 mm or more open to the atmosphere or with a gauge pressure of 0.05 MPa or less and fitted with a U-shaped vertical pipe having an inner diameter of 25 mm or more at the steam generating section;Hot water boilers with a gauge pressure of 0.1 MPa or less and a heating surface area of 8 m2 or less;Hot water boilers with a gauge pressure of 0.2 MPa or less and a heating surface area of 2 m2 or less;Once-through boilers (excluding those multi-pipe type with a header having an inner diameter exceeding 150 mm) used at a gauge pressure of 1 MPa or less with a heating surface area of 10 m2 or less (for the boilers with steam separator, limited to the said steam separator having an inner diameter of 300 mm or less and an internal cubic volume of 0.07 m3 or less ).
  • Class 1 pressure vessel
    (a) Of the vessels heating solids or liquids by receiving vapor or other heat media or by generating vapor, those having an internal pressure exceeding the atmospheric pressure (excluding vessels listed in items (b) or (c));(b) Of the vessels generating vapor by chemical, nuclear or other reactions, those having an internal pressure exceeding the atmospheric pressure;(c) Of the vessels for generating vapor by heating liquids contained therein to separate components of the said liquids, those with an internal pressure exceeding the atmospheric pressure;(d) In addition to the vessels listed in (a) to (c), the vessels containing liquids at a temperature exceeding their boiling points at the atmospheric pressure.(excluding those vessels used at a gauge pressure of 0.1 MPa or less with an inner cubic volume of 0.04 m3 or less or with an inner diameter of 200 mm or less and the length 1,000 mm or less and having the product of the maximum operating gauge pressure expressed in MPa multiplied by the internal cubic volume expressed in m3 are 0.004 or less)
  • Small-sized pressure vessel
    the term "small-sized pressure vessel" means the class-1 pressure vessels listed below:(a) Of the vessels used at a gauge pressure of 0.1 Mpa or less, those with an internal cubic volume of 0.2 m3 or less or with drum having an inner diameter of 500 mm or less and the length of 1,000 mm or less;(b) The vessels of the product of the maximum operating gauge pressure expressed in MPa multiplied by the internal cubic volume expressed in m3 are 0.02 or less.
  • Class 2 pressure vessel
    the term "class-2 pressure vessel" means vessels containing gas with a gauge pressure of 0.2 MPa or more (excluding the class-1 pressure vessels) listed below:The vessels with an inner cubic volume of 0.04 m3 or more;The vessels with a drum having inner diameter of 200 mm or more and length 1,000 mm or more.
Inspection activities (Boiler)
Inspection Activity Criteria
Design review - Steel boiler: Article 3 to 6 & Chapter 2, Article 42 to 47of Construction code for boilerCast iron boiiler: Article 88, Article 90 to 92 of Construction code for boiler
Material inspection - Steel boiler: Article 1 to 6 of Construction code for boilerCast iron boiiler: Article 89 of Construction code for boiler
Welding inspection Groove inspection Article 43, 48 and 49 of Construction code for boiler
Visual inspection Article 43, 46 and 47 of Construction code for boiler
Mechanical test Article 50 to 56 of Construction code for boiler
Radiographic test Article 57to 60 of Construction code for boiler
Visual inspection - Drawing, Specification, etc.
Hydrostatic test - Steel boiler: Article 61 of Construction code for boilerCast iron boiiler: Article 93 of Construction code for boiler
Component inspection - Steel boiler: Chapter 4 of Construction code for boilerCast iron boiiler: Article 94 to 101 of Construction code for boiler
Class 1 pressure vessel
Inspection Activity Criteria
Design review - Article 3 to 8 & Chapter 2, Article 39 to 44 of Construction code for pressure vessel
Material inspection - Article 1 to 8 of Construction code for pressure vessel
Welding inspection Groove inspection Article 40, 45 and 46 of Construction code for pressure vessel
Visual inspection Article 40, 43 and 44 of Construction code for pressure vessel
Mechanical test Article 47 to 55 of Construction code for pressure vessel
Radiographic test Article 56 to 62 of Construction code for pressure vessel
Visual inspection - Drawing, Specification, etc.
Hydrostatic test - Article 63 of Construction code for pressure vessel
Component inspection - Chpater 4 of Construction code for pressure vessel
Inquiry ~ Contract stage
Design review stage
Product inspection stage