R. W. Hamilton Ltd. - Burlington, Mississauga, St.Catharines R. W. Hamilton Ltd. - Burlington, Mississauga, St.Catharines
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By law, which hose assemblies must be CRN certified?

By law, hose assemblies require CRNs as outlined in CSA B51: Boiler, Pressure Vessel, and Pressure Piping Code. Hose assemblies are included under the category "D" fittings in the code. This typically includes hose assemblies associated with a boiler (i.e. steam hose), a compressor (i.e. air hose), or a pressurized tank/cylinder (i.e. oxygen hose, nitrogen hose, etc).

The following exemptions are allowed:
  • pressure vessels less than 1.5 cubic feet
  • pressure less than 15 psi
  • air hose assemblies 3/4" I.D. and smaller
  • propane, acetylene, fuel gas assembles (these are covered by the Fuel Gas Code)
  • water hose assemblies up to 250 psi and under 150 degrees F.
  • open ended system e.g. a hose attached to a pump to discharge fluid into an open tank

It should also be noted that most hydraulic hose assemblies and pressure wash assemblies are associated only with a pump and not a pressure vessel and therefore are outside the code.

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Large inventories at
all three R. W. Hamilton locations:
St. Catharines Burlington Mississauga
14 Wright Street
L2P 3J3
Ph: (905) 688-3810
Fax: (905) 684-9505
3073 North Service Road
L7N 3G1
Ph: (905) 335-4020
Fax: (905) 332-9566
2550 Goldenridge Rd., Unit #66 & 68
L4X 2S3
Ph: (905) 270-6130
Fax: (905) 270-4933
Administration Email: admin@rwhamiltonltd.com