1.Q1. What piping does one have to consider when checking for the ≤ 500 L (≤ 0.5 m3) volume exemption from design registration that is provided for in section 14(6)(a) of the Pressure Equipment Safety Regulation?
1.R1. The piping volume to be considered is the internal volume of the piping carrying an expansible fluid at a design pressure > 103 kPa that is not exempted by section 4(2) of the Pressure Equipment Safety Regulation (PESR). Non-expansible fluid piping need not be considered.
1.Q2. Does the ≤ 500 L (≤ 0.5 m3) volume exemption from design registration that is provided for in section 14(6)(a) of the Pressure Equipment Safety Regulation include attached pressure vessels or heat transfer apparatus such as air-cooled heat exchangers?
1.R2. No, only the piping volume needs to be considered.
1.Q3. A flange pair is to be inserted into an existing registered plant piping line to facilitate maintenance. Does this change to the piping require a design registration submission?
1.R3. No design registration would be required because this piping change would involve less than 500 L of piping volume. See PESR section 14(6)(a). Section 14(6)(a) applies to modifications and additions to existing registered or non-registered pressure piping systems as well as to new pressure piping systems.
1.Q4. A small amount of new piping (< 500 L internal volume) is to be added to an existing registered pressure plant. Does the exemption from design registration in 14(6)(a) of the Pressure Equipment Safety Regulation apply to the new piping or to the entire system?
1.R4. The exemption applies to the piping being added.
1.Q5. New piping of < 500 L internal volume is being added to an existing unregistered pressure piping system (exempt because of its small internal volume) and the resulting aggregate internal volume will exceed 500 L. Does this pressure piping system now require design registration?
1.R5. No. Section 14(6)(a) of the PESR applies to an addition to an existing non registered pressure piping system. It is not applied retroactively to the existing non-registered piping.
1.Q6. An engineering company has been engaged to design an addition to a small previously unregistered pressure plant facility. Because of its size (< 500 L contained volume in the piping) design registration was not a requirement for the original plant. The addition is of a size that is required to have its design registered. Must the original plant design be registered along with the new addition? No AB-83 Pressure Piping Construction and Test Data Reports are available for the existing plant.
1.R6. Unless the engineering company is prepared to assess fully the current condition of the pre-existing piping, to ascertain what specifications the piping materials are, to prove compliance with the code of construction, and is prepared to apply a professional engineer’s stamp to the reverse-engineered design of the old piping, registering the old piping would not be feasible. It would be desirable to include with the design registration package for the addition any design data that may be available for the old piping for information only.