scope:

Applicable pressure vessels

This Japanese Industrial Standard applies to the construction of pressure vessels with the design pressure of less than 30 MPa. Pressure vessels herein refer to the vessels which retain the pressure, contain fluids which generate the pressure, or those which retain the external pressure. Pressure vessels given in a) to f) below are excluded. This Standard and JIS B 8267 differ in the specifications of allowable stress of materials, impact test, etc. NOTE: The pressure, unless otherwise specified, means the gauge pressure.

a) Those specified in other Japanese Industrial Standards ¹⁾

 b) Those made of non-metallic materials

c) Those used for atomic energy

d) Those of riveted or soldered structure

e) Those exposed to direct fire

f) Those with special structures ²⁾ or for special applications ³⁾

Notes ¹⁾ Examples of Japanese Industrial Standards are shown below.

JIS B 8267 Construction ofpressure vessel

JIS B 8266 Alternative standard for construction of pressure vessels

JIS B 8201 Stationary steel boilers - Construction

JIS B 8240 Construction of pressure vessels for refrigera Hon

JIS B 8241 Seamless steel gas cylinders

JIS B 8248-1 Cylindrical layered pressure vessels - Part 1 : General standards

JIS B 8248-2 Cylindrical layered pressure vessels - Part 2 : Alternative standards

JIS B 8501 Welded steel tanks for oil storage

²⁾ Such as those with complicated shapes, flat-bottom cylindrical tanks for low temperature and tanks with membrane structure.

³⁾ Pressure retaining parts of rotating or reciprocating machines such as oil hydraulic machines, water hydraulic machines, pumps, compressors, turbines, internal combustion engines, water pressure cylinders or pneumatic pressure cylinders.

Scope of pressure vessels 

The scope of pressure vessels shall include the main body of pressure vessles [shells, heads and nozzle stubs (nozzles) directly connected to them], and the pressure retaining parts given in a) to c) below.

a) In the case of the tubes bonded to shells, heads or nozzle stubs (directly connected to them) of pressure vessels, the pressure retaining parts shall be from the bonded joints (welded joint, screw joint or bolted flanged tube joint) up to the parts given in 1) to 3) below.

1) In the case of the welded joint, up to the groove face of the circumferential joint of the tube nearest to the welded joint (excluding the circumferential joint)

2) In the case of the screw joint (including the tube joint with inside screw), up to the threaded portion of the tube side of screw joint

3) In the case of the bolted flanged tube joint, up to the flange face of the tube side of the bolted flanged tube joint (including bolts and nuts)

b) In the case of the direct welding of non-pressure member onto the pressure retaining part, up to the welded joint

c) Up to the cover plate such as a manhole and a hand-hole which retain the pressure (including the bonded joint)

Valves may be included in the scope of pressure vessels.