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CONSTRUCTION CODE FOR BOILERS
|Notification No.197 of the Ministry of Health, Labour, and Welfare
Article 88. Restrictions on Cast Iron Boilers
Part 2. Cast Iron Boilers
Any of the steam boilers or hot water boilers specified below shall not be made of iron castings:
(1) Steam boilers to be operated exceeding 0.1 MPa in pressure
(2) Hot water boilers exceeding 0.5 MPa (replaced by 1 MPa if a fracture test is conducted in accordance with JIS B8203 (Cast Iron Boilers -- Construction) and if the maximum allowable working pressure is determined based on the results of the said test) in pressure.
(3) Hot water boilers exceeding 120 in water temperature
Article 89. Main Materials
1. Main materials for cast iron boilers (simply called the "boiler" or "boilers" in all subsequent paragraphs of this part) shall have chemical compositions and mechanical properties that can be used safely under the chemical and physical influences of the maximum allowable working pressure and the working temperature.
2. The provisions in the paragraph 2 of the Article 1 apply to the working temperature in preceding paragraph.
Article 90. Construction of Boilers
The construction of the boiler shall be of the sectional type.
Article 91. Wall Thickness of Sections
The wall thickness of sections shall be not less than 8 mm for the boilers not exceeding 0. 3 MPa in maximum allowable working pressure and not less than 10 mm for those exceeding 0.3 MPa in such maximum pressure. However, this provision does not apply to the boilers of special construction featuring, among others, sections reinforced with stays.
Article 92. Inspection Holes
The boiler shall have an inspection hole that enables internal inspection.
Article 93. Hydraulic Tests
The boiler shall be found free of any defect by a hydraulic test under the appropriate one of the pressure levels specified below for different categories of boilers and sections thereof. The hydraulic test in item (3) shall be conducted before the sections are fabricated into a complete boiler.
(1) For steam boilers: 0.2 MPa
(2) For Hot water boilers: 1.5 times the maximum allowable working pressure (or 0.2 MPa if such maximum pressure is below this level)
(3) For sections: 0.4 MPa for boilers not exceeding 0.2 MPa in maximum allowable working pressure and double the maximum allowable working pressure for boilers exceeding 0.2 MPa in the said maximum allowable working pressure.
Article 94. Safety Valves and Other Safety Devices
Steam boilers shall be equipped with safety valves or other safety devices that can keep the internal pressure from exceeding the maximum allowable working pressure.
Article 95. Relief Valves and Relief Pipes
1. Hot water boilers for space heating shall be fitted with relief valves that are immediately actuated whenever the pressure in the boiler reaches the maximum allowable working pressure and keep the internal pressure from exceeding the maximum allowable working pressure. However, this does not apply to such hot water boilers that have relief pipes which lead to the open expansion tanks and which keep the internal pressure from exceeding the maximum allowable working pressure.
2. Hot water boilers for hot water supply shall be provided with relief valves that are immediately actuated whenever the pressure in the boiler reaches the maximum allowable working pressure and keep the internal pressure from exceeding the maximum allowable working pressure. However, this does not apply to such hot water boilers for hot water supply having relief pipes rising above the water level in the feedwater tanks.
Article 96. Pressure Gauges, Hydraulic Pressure Gauges and Thermometers
1. Pressure gauges shall be attached to the steam space or water column of a steam boiler or to the steam-side connection to the water column.
2. Hot water boilers shall have hydraulic pressure gauges installed on the boilers themselves or near the hot water outlets. However, pressure gauges may be substituted for hydraulic pressure gauges.
3. The provisions in the Articles 66 (with the exception of the item 5),
67, and the paragraph 2 of the Article 68 respectively apply to the pressure
gauges of steam boilers, the hydraulic pressure gauges of hot water boilers,
and the thermometers of hot water boilers.
Article 97. Glass Water Gauges and Gauge Cocks
Steam boilers (not including those which have a low water level fuel shut-off device or an automatic water level control system and glass water gauges fitted with straight through drain valves or drain cocks not smaller than 8A in nominal diameter) shall be equipped with at least two glass water gauges each. However, one of these water gauges may be replaced by some other water level indicator.
2. The Articles 69 (with the exception of the paragraph 1) applies to the
glass water gauges of steam boilers.
3. If gauge cocks are to be used as a substitute water level indicator for the glass water gauge, at least two of such cocks shall be installed in the same height range as the mounting for the glass tube of the glass water gauge.
4. The paragraph 2 of the Article 72 applies to the gauge cocks of steam boilers.
Article 98. Automatic Water Temperature Regulators
Those hot water boilers with working pressure exceeding 0.3 MPa shall be equipped with an automatic water temperature regulator to hold the water temperature from rising above 120.
Article 99. Blowoff Pipes etc.
1. Steam boilers shall have a blowoff pipe that can discharge scale or sediment and that is fitted with a blowoff valve or a blowoff cock.
2. The blowoff valve or the blowoff cock shall be installed in a conspicuous place where it can be handled easily.
3. The blowoff valve shell be so designed as to preclude the deposit of scale or other sediments on its inside surface.
Article 100. Water Supply from Pressurized Sources
If feedwater is supplied from the tap or some other pressurized source, the piping for such water source shall be attached to the return line.
Article 101. Application of Provisions Mutatis Mutandis
The Articles 86 and 87 herein apply correspondingly to the cast iron boiler.