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Technical Note (National Research Council of Canada. Division of Building Research), 1957-12-01
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Comments on A.S.A. Z21.21 - 1952: Listing Requirements for Automatic Valves for Gas Appliances; and A.S.A. Z21. 37 - 1948: Approval
Requirements for Dual Oven Type Combination Gas Ranges Kent, A. D.; Hutcheon, N. B.
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NRC Publications Record / Notice d'Archives des publications de CNRC: https://nrc-publications.canada.ca/eng/view/object/?id=06ea799c-3fee-4087-befb-c4148cf46b0a https://publications-cnrc.canada.ca/fra/voir/objet/?id=06ea799c-3fee-4087-befb-c4148cf46b0a
DIVISION OF BUILDING RESEARCH
NATIONAL RESEARCH COUNCIL OF CANADA
No.
243
NOTE
'Jr
EClHIN ][CAIL
NOT FOR PUBLICATION FOR INTERNAL USE
A.D. Kent and
PREPARED BY N.B. Hutcheon CHECKED BY APPROVED BY NBH
PREPARED FOR C.S.A. Committee on Gas Burning
Appliances and Equipment December 1957
SUBJECT Comments on A.S.A. 221.21 -1952:
Listing Requirements for Automatic Valves for Gas Appliances; and A.S.A. Z2l.37 - 1948: Approval Requirements for Dual Oven Type
Combination Gas Ranges.
The above A.S.A. specifications have been reviewed as a basis for the preparation of corresponding eSA specifications. All references to American Standards are listed below, with information on existing Canadian Standards where these exist. Reference is made also to items which are potentially in conflict with-existing Canadian codes such as the National Building Code, 1953. All specified temperatures (except oven operating tempera-tures) are listed as a convenience in further consideration of these specifications.
standards
Paragraph American Standard Canadian Standard
3 3
A.S.A. B2.1 - 1945
- 2 =
Electrical equipment, wiring, motors Page Paragraph
4
Instead of ａｾｓｯｫＮ Cl = 1951 useC.S.A.. C220 l ］ｾＱＹＵＳ (this should be
checked with Electrical Code Committee)
American Standard Listing Requirements Page parasraph Code Number Title
3
Semi-rigid gas appliancetubing and fittingso This reference will presumably be changed to the corresponding C.S.A. Standard when it is completed.
Miscellaneous
I. Pipe sizes
Nominal pipe sizes are presumably in accordance with
A.S.A. B36.l0 - 1950 (C.S.A. B62 = 1949 and B63 = 1949)
2. Temperatures
4
Paragraph
2.10 Minimum melting point of metals 800°F
A.S.Ao Z2lo37 = 1948 standards
Pase Section American Standard Canadian Standard
4-
6.a AoS.A. B36010 = 1939 ( CoSoA. B62 - 1949-
{ CoSoA. B63 - 19498 2000; A.Bok. Bl.l ｾ 1935 C.SoA. Bl"l ｾ 1949
American"Standard Listing and Installation Requirements Page Section 3 30c 4
5
0El ) 22 100a ) 6 14.a )23
120 a ) 9 23 ) 27 18 ) 31 18 ) 10 24.a Code Number Z210 20 = 1940 Z21.15 = 1944 Z210l8 = 1934 Z2l.35 = 1945 Title Automatic pilots Gas valvesGas appliance thermostats Domestic gas appliance
pressure regulators Gum protective devices
These references will presumably be brought up to date in the revised Z2l037 and should be changed to the corresponding
cr
oS.Ao Standards when they are completed.Miscellaneous 10 Sheet Metal Gauges
Metal thicknesses are given in gaugeso There is no Canadian Standard on sheet metal ｧ｡ｵｧ･ｳｾ although at present CoG.SoBo
is working on gauging. The National" Building
ｃｯ､･ｾ 1953 refers to U.S. Standard gauge.
2. Pipe sizes
Nominal pipe sizes are presumably in accordance with A.SoA. B36.l0 - 1950 (no CoSoA. Standard)
Pipe threads are presumably in accordance with AoSoA. B2.1 ｾ
1945 (no CoS.Ao Standard) 3. Test gases
4.
DefinitionsDraft hood - differs from-NeBoC. Flue ｾ differs from NoBoC.
Heating value (total) - higher calorific value. Others refer to lower calorific value.
5.
Temperatures-3
26
Section
Minimum melting point of metals 800°F Maximum temperature. on adjacent walls 1200F above room tempo (ioeo 190°F) and on floor 90°F above room tempo (ioeo 1600F) at the end of 60 minutes
ｴ･ｳｴｾ
(NoB.C. requires maximum of 1600F on all adjacent surfaces)
6. Heating Value of Supplementary Fuels Section
3
Should these be revised for Canadian fuels?Agreement with National Building Code? 1953
There appears to be general agreement between the above two works and the National Building Code.
The NoBoG. does not detail metal composition, sheet thick= nesses and temperatures as do the American Standards o The American Standards permit a higher surface temperature on adjacent walls than is allowable under the NoB.Co
The NoBoCo requirements for controls for gas firing, item
6.2.3.8.5
may be stricter than in ｴｨｾ American StandardoNote, for example, the last paragraph of this section requiring shut-off upon drop in pressure with liquefied petroleum gases.
