Marine Machinery Regulations
Version of the schedule from 2006-03-22 to 2021-06-22:
SCHEDULE IIIUnfired Pressure Vessels
SCHEDULE IIIUnfired Pressure Vessels
PART I(Section 4)Design Specifications
| Item | Requirements |
|---|---|
| 1 | None. |
PART II(Section 6)Plans
| Item | Required Information |
|---|---|
| 1 | General arrangement of the installation of the unfired pressure vessel in the ship, showing means of support. |
| 2 | Design working pressure, temperature, volume and nature of fluid under pressure. |
| 3 | Materials, sizes and arrangement of parts under pressure, including valves. |
| 4 | Details of welded seams, openings, connections, attachments and supports, including details of welding materials, methods and procedures. |
| 5 | Details of the heat treatment process and testing procedures. |
| 6 | Diagrammatic arrangement and a written description of the pressure source and heat exchange, as applicable, including cut-offs and alarms. |
| 7 | Pressure setting, relieving capacity and venting arrangements of safety or liquid relief valves. |
| 8 | Details of fusible plugs or similar devices required to protect vessels from over-pressure caused by fire or other heat hazards. |
| 9 | Where a manufacturer of an unfired pressure vessel or a hydro-pneumatic tank certifies that the unfired pressure vessel or hydro-pneumatic tank was constructed in accordance with rules or codes, information set out in items 2 to 8 is not required to be submitted for
|
PART III(Subsection 12(2))Construction and Installation Inspections
DIVISION IConstruction Inspection
| Item | Requirements |
|---|---|
| 1 | Identification from material test certificates, before construction is commenced, of materials to be used, including welding metal, and of physical properties and mechanical test results obtained from material testing carried out in accordance with these Regulations. |
| 2 | Verification that welding was carried out by welders certified by a Provincial Government of Canada, or another authority having similar standards where the welding was carried out outside Canada, for the class of work to be done. |
| 3 | Inspection of welds including non-destructive test examination and verification of the heat treatment process in accordance with rules or codes. |
| 4 | Verification of plate preparation and alignment prior to assembly and, on completion of all construction operations, confirmation of circularity of shells. |
| 5 | Identification from component inspection certificates of components related to the safety of the unfired pressure vessel. |
| 6 | Inspection of components and their installation, including tubes and tube plates. |
| 7 | Inspection of the constructed unfired pressure vessel. |
| 8 | Witnessing of hydrostatic pressure tests in accordance with rules or codes. |
DIVISION IIInstallation Inspection
| Item | Requirements |
|---|---|
| 1 | Verification of correct alignment of securing arrangements. |
| 2 | Verification of correct adjustment and operational condition of the connection of the unfired pressure vessel to associated systems. |
| 3 | Verification of correct adjustment and operational condition of safety, control and monitoring devices. |
| 4 | Verification of reliability and sufficiency under trials up to the assigned working pressure under normal working conditions for a suitable endurance period, taking into consideration the size and complexity of the unfired pressure vessel and its pressure source. |
PART IVPeriodic General Inspections and Periodic Special Inspections
DIVISION I(Section 19)Periodic General Inspection
| Item | Requirements |
|---|---|
| 1 | Correct adjustment and operational condition of safety devices. |
| 2 | Operational condition of liquid gauges and attached valves. |
| 3 | Locations where fluid leakage, metal wastage or metal deformation may occur. |
| 4 | Correct adjustment of controls and monitoring systems. |
| 5 | Operational condition of alarm systems, particularly where the unfired pressure vessel is designed for non-continuous local supervision. |
DIVISION IIPeriodic Special Inspection
SUBDIVISION I(Subsection 20(1))Parts to be Inspected
| Item | Requirements |
|---|---|
| 1 | Internal fluid spaces as far as practicable with all spaces clean and removable components removed and where, due to construction features, an adequate internal inspection cannot be carried out, a hydrostatic pressure test of 1.25 times the assigned working pressure of the spaces. |
| 2 | Access and inspection openings and fusible plugs where fitted. |
| 3 | Pressure-vessel mountings, including safety valves and liquid-level gauges, without opening up and cleaning unless there is apparent damage, improper operation or deteriorated condition of those components. |
| 4 | Float chambers and float mechanisms on liquid-level regulators, following opening up and cleaning. |
| 5 | Pipes, actuators and other components, incorporated in self-regulating and monitoring systems, as far as is practicable, without dismantling where their general condition shows that they are suitable for further service. |
| 6 | Seams, mountings, seatings and welded attachments, following the removal of insulation and sheathing, to the extent considered necessary by the inspector, on the basis of the general condition of the unfired pressure vessel. |
| 7 | Except where, on the basis of the periodic general inspection, there is apparent damage, improper operation or deteriorated condition of components, items 1 to 6 do not apply where
|
SUBDIVISION II(Subsection 20(2))Intervals
| Item | Requirements |
|---|---|
| 1 | Steam-heated steam generators, at intervals not exceeding 2 years. |
| 2 | Water evaporators and steam condensers, at intervals not exceeding 5 years. |
| 3 | Unfired pressure vessels containing air or air and water under pressure, at intervals not exceeding 5 years. |
| 4 | Unfired pressure vessels containing non-corrosive liquid or non-corrosive liquid and gas under pressure, at intervals not exceeding 20 years. |
| 5 | Liquid tubular heat exchangers with one fluid side opened up, at intervals not exceeding 5 years, and without further dismantling unless dismantling is considered necessary by the inspector on the basis of the general condition of the heat exchangers. |
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