HPAC Magazine

Three CSA standards adopted for boilers and pressure vessels

May 30, 2017 | By HPAC Magazine

The Code Adoption Document (CAD) was established to provide technical details needed to complete the regulatory framework provided for in the Act and O.Reg.220/01.

Ontario Regulation 220/01: Boilers and Pressure Vessels, under theTechnical Standards and Safety Act, 2000, applies to the design, construction, maintenance, use, operation, repair and service of boilers, pressure vessels and piping.

National codes developed by the Canadian Standards Association (CSA) are adopted under the authority of TSSA’s Statutory Director. The proposed TSSA Boilers and Pressure Vessels (BPV) CAD Amendment adopts the new Code with amendments that incorporate the previous CAD as well as changes suggested by Ontario’s technical and safety stakeholders.

TSSA is sought comments (10 were received*) on the BPV CAD Amendment that will adopt three CSA standards that govern pressure equipment in Canada.  These include the latest editions of:

  1. CSA B51 – the boiler, pressure vessel and pressure piping code, which is the national document for non-nuclear pressure equipment in Canada
  2. CSA B52 – the mechanical refrigeration code
  3. CSA N285.0  – general requirements for pressure-retaining systems and components in Canada Deuterium Uranium(CANDU) nuclear power plants/material standards for reactor components for CANDU nuclear power plants

CAD Changes

CSA B51 (2014)

New provisions include:

  • New definitions not in previous Code, including: air heater coil, owner, pressure relief device (PRD) and thermal expansion relief
  • New Clause for the Requirement on Pressure Relief Devices (content taken from previous Annex H)
  • New Clause for In-Service Inspection (content more descriptive than prescriptive as it deals with normal owner/user practices)
  • Addition of Table 5 for Design Change Qualification Tests (content from previous Annex H)
  • New Annexes for Finite Element Analysis; and Historical Boilers

Ontario changes include:

  • Changes to the servicing intervals for safety relief valves – the previous edition permitted a five year servicing interval or annual lift tests for steam and air services. The current edition requires a five year servicing interval and annual lift tests. TSSA proposes the following changes for the BPV CAD:

·  Steam service: shall be serviced every five years; where annual lift tests are conducted from the beginning of the servicing interval, servicing may be extended to a maximum of eight years; and

·  Air service: shall be serviced every five years; where annual lift tests are conducted from the beginning of the servicing interval, servicing may be extended to a maximum of 10 years

CSA B52 (2013)

New provisions include:

  • Additional definitions including automated control, fade-out-vessel, primary and secondary refrigerant and many more
  • New Annex covering precautions and hazards of working with CO2 (carbon dioxide) systems
  • New Annex covering the characteristics of CO2
  • Updated tables and additional clauses

Ontario changes include:

·  Making the Code more technically accurate, specifically clarifying and updating copper tube material specifications

CSA N285.0 (2012)

New provisions include:

·  This updated standard specifies the technical requirements for the design, procurement, fabrication, installation, modification, repair, replacement, testing examination and inspection of pressure-retaining systems and containment systems over the service life of a nuclear facility.  Changes include clarification of process, piping and design system rules

There are no Ontario based proposed changes to this Code

Links to the Propane Code Adoption Document (CAD) Amendment

·  TSSA’s Propane CAD Amendment details new requirements for industry inspection and replacement of pressure relief valves (PRVs) on propane tanks, adopting the wording from the latest version of the CSA B51 (2014) Pressure Vessel Code

·  The Propane CAD Amendment includes UL certification for safety relief valves for propane storage tanks. Notes have been provided in the BPV CAD to direct readers to the Propane CAD for instructions regarding certification

* One comment resulted in a minor revision to the BPV CAD Amendment, page 13, section 1.37. A correction to the proposed BPV CAD was required to return the word “annually” for manual lift tests of hot water heating boilers.This was inadvertently removed and is not a change from the previous BPV CAD requirements. This section has been revised to read:

b. Heating boilers
ii. steam service operating up to and including a maximum pressure of 103 kPa (15 psig) shall have a manual lift test
annually and shall be serviced every five years




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