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Absolutely! We specialize in custom designs tailored to meet unique operational requirements. Our engineering team collaborates closely with clients to develop solutions that fit their specific needs. Please check our Pressure vessel Engineering services and contact us for a discussion about your project and obtaining a quote.

The specific documentation and engineering specifications required for obtaining a Canadian Registration Number (CRN) for a pressure vessel designed according to ASME VIII standards typically include detailed design drawings, calculations demonstrating compliance with ASME standards, material specifications, fabrication procedures, and quality control documentation. Additionally, you may need to provide information about the intended operating conditions, such as pressure, temperature, and medium handled by the vessel. Acetake Group is available to assist you in ensuring that all the required documents are included and that your application process goes smoothly. Please refer to our CRN Registration and Provincial Registration.

Fatigue assessment in pressure vessels involves adherence to the ASME Boiler and Pressure Vessel Code, specifically Section VIII, Division 2. The process begins by selecting fatigue-tolerant materials and incorporating stress-minimizing features into the vessel's design. Factors influencing fatigue life include the cyclic stress state, geometry, surface quality, weld quality, material type, residual stresses, internal defects, grain size, environment, and temperature. The assessment includes testing materials through cycles to generate Stress vs. Number of Cycles curves (S-N curves), and the Rainflow counting algorithm is often employed to count stress cycles accurately. Regular examinations, non-destructive testing (NDE) methods, and meticulous record-keeping play essential roles in extending a pressure vessel's life beyond its predicted duration, offering a holistic approach to ensure safety and reliability.
  1. IoT Sensors and Connectivity:

    • Application: IoT sensors are integrated into boilers and pressure vessels to collect real-time data on various parameters, such as temperature, pressure, and vibration.
    • Benefits: These sensors enable continuous monitoring and data collection, providing insights into equipment health and performance. The connectivity allows for remote access, facilitating predictive maintenance, and optimizing operational efficiency.
  2. Predictive Maintenance Algorithms:

    • Application: Advanced algorithms, often driven by machine learning, analyze the data from IoT sensors to predict potential equipment failures and recommend maintenance actions.
    • Benefits: Predictive maintenance helps in identifying issues before they lead to downtime or critical failures. It optimizes maintenance schedules, reduces costs, and extends the lifespan of boilers and pressure vessels.
  3. Remote Monitoring and Control Systems:

    • Application: Remote monitoring systems enable operators to oversee and control boilers and pressure vessels from a centralized location.
    • Benefits: Operators can monitor real-time data, receive alerts for anomalies, and remotely adjust operational parameters. This enhances overall efficiency, allows for quick response to issues, and is particularly beneficial for equipment in geographically dispersed locations.
The pressure vessel design incorporates advanced finite element analysis (FEA) to identify stress concentrations and assess fatigue life. Material properties, operating temperatures, and pressure variations are meticulously considered. The design adheres to recognized industry codes and standards, ensuring robustness and longevity under diverse operational scenarios.
The specific industry codes and standards for pressure vessel design can vary depending on the location, type of vessel, and the industry it serves. However, some widely recognized codes and standards in Canada and United States include:


  1. CSA B51 - Boiler, Pressure Vessel, and Pressure Piping Code: This code is developed by the Canadian Standards Association (CSA) and is widely recognized in Canada. It covers the design, construction, installation, inspection, and testing of pressure equipment.

  2. ASME BPVC: While CSA B51 is the primary standard in Canada, ASME BPVC is also recognized and accepted in many jurisdictions within the country.

United States:

  1. ASME Boiler and Pressure Vessel Code (BPVC): The ASME BPVC is widely adopted in the U.S. and provides rules for the design, fabrication, and inspection of boilers and pressure vessels.

  2. API 510 - Pressure Vessel Inspection Code: This standard, developed by the American Petroleum Institute (API), is specifically focused on the inspection of pressure vessels and is commonly used in the petrochemical industry.

  3. NBIC (National Board Inspection Code): The NBIC provides standards for the installation, inspection, and repair of boilers and pressure vessels.

In Ontario, the fabrication of boilers and pressure vessels involves strict requirements for welder qualifications and welding procedures to ensure the integrity and safety of the equipment. The Technical Standards and Safety Authority (TSSA) sets forth guidelines in alignment with the ASME Boiler and Pressure Vessel Code. The key requirements include:

  1. Welder Qualifications:

    • Welders involved in the fabrication of boilers and pressure vessels must be qualified in accordance with the ASME Boiler and Pressure Vessel Code, Section IX.
    • Qualification involves a rigorous process that includes performance testing of the welder's skills and the examination of their knowledge of welding procedures.
  2. Welding Procedures:

    • Welding procedures must be established and documented for each specific application and material type.
    • These procedures are developed in accordance with the ASME Boiler and Pressure Vessel Code and must be submitted to the TSSA for review and approval.
    • The welding procedures include details such as welding processes, materials, preheat and interpass temperatures, filler metals, joint design, and post-weld heat treatment.
  3. Procedure Qualification Record (PQR):

    • A Procedure Qualification Record (PQR) is required for each welding procedure.
    • The PQR documents the testing and results of the procedure qualification, including mechanical and non-destructive testing, to demonstrate that the welding procedure meets the required standards.
  4. Welding Inspection:

    • The welding process is subject to inspection by TSSA-authorized inspection agencies or TSSA inspectors.
    • Inspections ensure that welds are performed in accordance with approved welding procedures and meet the specified quality and safety standards.
  5. Non-Destructive Testing (NDT):

    • Non-destructive testing methods, such as radiographic testing or ultrasonic testing, may be required to assess the quality of welds and detect any defects.
    • The specific NDT methods used depend on the material, joint design, and the criticality of the welded connections.
  6. Certification and Documentation:

    • Welders must possess valid certifications that demonstrate their qualification for the specific welding processes and materials used in the fabrication of boilers and pressure vessels.
    • All certifications and documentation related to welder qualifications and welding procedures must be maintained and made available for inspection by TSSA during audits.

Adherence to these requirements is essential to ensure that the welding processes used in the fabrication of boilers and pressure vessels in Ontario meet the highest standards of safety and quality. Non-compliance can result in the rejection of equipment, project delays, or other regulatory consequences.

You have a few options. First, contact the boiler manufacturer. They typically keep archives with all the necessary reports, drawings, and specifications. Alternatively, if the boiler is registered with the national board, you can obtain the reports for a small fee. In the worst-case scenario, if there's no registration or the manufacturer is no longer in business, consider contacting us at Acetake Group. We can help develop a comprehensive repair plan, including component identification and proper calculations for presentation to TSA and the authorized inspector.
  1. Purpose:

    • Pressure Vessel: A pressure vessel is designed to contain fluids or gases at a pressure different from the ambient pressure. Its primary function is to store, transport, or process these fluids under high or low pressure conditions.
    • Boiler: A boiler, on the other hand, is a specific type of pressure vessel designed to convert water into steam. Its primary purpose is to generate steam for heating, power generation, or other industrial processes.
  2. Function:

    • Pressure Vessel: Pressure vessels are versatile and can be used for various applications such as storing compressed air, chemicals, or liquids under pressure. They are not involved in the direct production of steam or heat.
    • Boiler: Boilers are specialized pressure vessels that use heat from fuel combustion or other heat sources to produce steam. This steam is then used for heating or to power machinery.
  3. Components:

    • Pressure Vessel: Pressure vessels typically have a simple design, consisting of a container with various fittings for pressure measurement, safety valves, and access points.
    • Boiler: Boilers have a more complex design with additional components like burners, tubes, and a combustion chamber to facilitate the generation of steam.
  4. Regulations:

    • Both pressure vessels and boilers are subject to strict safety regulations, with specific codes and standards governing their design, fabrication, and operation. These regulations vary depending on the region and the intended use of the equipment.
  5. Applications:

    • Pressure vessels find applications in industries such as petrochemical, pharmaceutical, and manufacturing where the storage or transport of pressurized fluids is required.
    • Boilers are primarily used in power plants, heating systems, and industrial processes where steam is needed for energy or heating.

In summary, the main difference between a pressure vessel and a boiler lies in their primary purpose and function. While pressure vessels are designed to store or transport fluids under pressure, boilers are specialized vessels used to generate steam for various industrial applications. Understanding these distinctions is crucial for ensuring the safe and efficient operation of these essential components in different industries.

A variance pertains to boilers or pressure vessels that fail to meet code requirements. In certain cases, allowances may be made for items that do not fully comply with Ontario's Technical Standards and Safety Act, Boilers and Pressure Vessels, Operating Engineers Regulations, Director's Order, and Code Adoption Document. The Director or Chief Officer may grant a variance if they are convinced, as permitted in Section 36(3)(c) of the Technical Standards and Safety Act, that the deviation would not have a negative impact on the safe usage of the equipment.
  • When the BPV is insured with a boiler and machinery insurance policy, the insurance company is responsible for inspecting the device and issuing the certificate of inspection required by the Ontario Regulation 220/01: Boilers and Pressure Vessels.
  • When the boiler or pressure vessel is not insured, TSSA inspects the device and issues the Certificate of Inspection required by the Ontario Regulation 220/01.
  1. A pressure container that holds a gas, vapor, or liquid with a maximum allowable working pressure of 15 psi or lower.
  2. A pressure container that holds liquids that are no more hazardous than water, operating at a temperature of 150°F or lower, and with a maximum allowable working pressure of 250 psi or lower.
  3. A pressure container designed for domestic use, having an internal diameter of 24 inches or smaller, used for storing hot water not exceeding 212°F and with a heat input of 120 kW or lower.
  4. A pressure container used exclusively for hydraulic purposes, operating at a temperature not exceeding 150°F (65°C).
  5. A pressure container with an internal diameter of 24 inches (610 mm) or smaller, connected in a liquid pumping system, operating at a temperature not exceeding 150°F (65°C), and containing compressed air or an inert gas as a cushion.
  6. A pressure container with a capacity of 1 and one-half (1½) cubic feet (42.5L) or smaller, excluding fittings.

Repairs encompass any necessary tasks to reinstate a boiler or pressure vessel to a secure operational state, without deviating from the original design. In case there is a deviation from the design, there are different requirements.


Companies undertaking repair work must possess a Certificate of Authorization issued by TSSA or another Canadian jurisdiction. These companies can be found listed in TSSA's business directory. Alternatively, companies holding a National Board Certificate of Authorization (indicated by an "R" stamp) are also acceptable, as long as they fulfill all the requirements set by the National Board.


Inspection of BPVs for repair purposes with Mechanical Breakdown insurance:

If your BPVs are covered by Mechanical Breakdown insurance, get in touch with your insurer to arrange for the repair inspection.


Inspection of BPVs for repair purposes without Mechanical Breakdown insurance:

Prior to commencing any repair work, contact a local TSSA BPV inspector to ensure compliance with all technical and regulatory prerequisites. You can consult our BPV Inspector list to locate an inspector in your vicinity.