Comments on A.S.A. Z21.39 - NRC Publications Archive

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Comments on A.S.A. Z21.39 - 1957 Listing Requirements for Gas
Conversion Burners for Domestic Ranges
Kent, A. D.; Hutcheon, N. B.
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NATIONAL RESEARCH COUNCIL OF CANADA
DIVISION
OF
BUILDING
'fE C 1HIN II CAlL
NOT
FOR
242
NOTlE
FOR
PUBLICATION
A. Do Kent and
CHECKED BY
NoBo Hutcheon
FOR
CSA Committee on Gas Burning Appliances
and Equipment
PREPARED
BY
PREPARED
SUBJECT
No.
RESEARCH
INTERNAL
APPROVED
USE
BY
NBH
DATE
January 1958
Comments on A.SoAo Z21.39 - 1957
Listing Requirements for Gas Conversion
Burners for Domestic Ranges
The above ASA specification has been reviewed as a basis
for the preparation of a corresponding CSA specification. 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 are listed as a convenience in further
consideration of this specification.
Standards
Paragraph
1
2
1.2.1
1.2.2
1.3.2)
4
3
1.6.2a
1
1.8.1)
American Standard
A.S.A. Bl.l - 1949
AoS.Ao B18.62 - 1956
A.S.A. B36.10 - 1950
AoI.S.I. 416
Canadian Standard
C.S.A. Bl.l - 1949
C.S.A. B33.1 - 1950
(C.S.A. B62 - 1949
(C.S.A. B63 - 1949
No C.S.A. Probably use·
A.I.S.I.
American Standard Listing and Installation
ReqUirements
Page
Paragraph
Code Number
3
10
1.6.3a)
20801 )
Z21.20 - 1951
Automatic Pilots
4
11
1.7.1)
2 09 )
Z21015 - 1954
Gas valves
109.1
Z21.35 - 1945
Gum protective devices
101002)
2010 )
Z21018 - 1956
Domestic gas appliance
pressure regulators
4
5
11
Title
;
- 2 -
Page
Paragraph
Code Number
5
1.11
Z21.21 - 1952
6
2.1.2
Z21.38 - 1957
Title
Automatic valves for
gas appliances
Installation of gas
conversion burners
in aomestic ranges
These references will presumably be changed to the
corresponding C.S.A. Standards when they are completed.
Miscellaneous
I.
Sheet metal gauges
In the above standard sheet metal thicknesses are given
in gauges. There is no Canadian standard on sheet metal gauges,
although at present C.G.S.B. is working on gauging. The
National Building Code 1953 refers to U.S. standard gauge.
2.
Pipe sizes
Nominal pipe sizes are presumably in accordance with
A.S.A. B36.10 - 1950. Use C.S.A. B62 - 1949 and B63 - 1949.
Pipe threads are presumably in accordance with A.S.A.
B2.l - 1945 (no C.S.A. standard).
3.
Wire screen
Page
Paragraph
No. 40 mesh brass, aluminum or eqUivalent
5
This is equivalent to 420 microns mesh as specified in
C.G.S.B. 8-GP-la.
4.
Test gases
Are Canadian test gases the same?
5.
Definitions
Draft hood - differs from N.B.C.
Flue - differs from N.B.C.
Heating value (total) - higher calorific value. Others
refer to lower calorific value.
,.,
,
- 3 -
6.
Temperatures
Page
Paragraph
2
2
3
4
5
1.,301 )
1.502 )
1.6,,2c)
1.802 )
101203)
Minimum melting point of materials
1450 0 F and lOOOoF
4
1.805
Maximum temperature on aluminum tubing
700°F
Agreement with National Building Code, 1953
There appears to be general agreement between the above
tvlO
v'JOrks.
The NoB. Co does not detail metal composition, sheet
thiclD16sses and temperatures as does the American Standard.
The NoB.Co
item 6.2.308 05 may
Note, for example,
shut-off upon drop
requirements for controls for gas firing,
be stricter than in the American Standard.
the last paragraph of this section requiring
in pressure with liquefied petroleum gases.