I learned CRN(Canadian Registration Number) is required even for ASME-stamped pressure vessel and fitting that includes all of the compnents subjected to 15 psi , i.e. tubes regardless of size, measuring devices(pressure trnasducer), filters, pumps, blowers in Ontario province.

To source CRN fittings is not an easy task and might practically unable to ship a system containg pressure vessels and piping systme to Ontario, Canada.

Is CRN a law and legal requirment? Is there any room that end user in Ontario, Canada can select a system containing ASME-stampted pressure vessel,interconnecting piping and control devices but without CRN?