Comments on A.S.A. Z21.13.1 - 1956 and Addenda Z21.13. 1a - 1957 Vol. 1. Steam and Hot Water Boilers

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Publisher’s version / Version de l'éditeur:

Technical Note (National Research Council of Canada. Division of Building Research), 1957-12-01

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Comments on A.S.A. Z21.13.1 - 1956 and Addenda Z21.13. 1a - 1957 Vol. 1. Steam and Hot Water Boilers

Kent, A. D.; Hutcheon, N. B.

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TEC1HTNlICAlL

NOTJE

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NOT FOR PUBLICATION FOR INTERNAL USE

PREPARED A.D. Kent and

BY N.B. Hutcheon CHECKED BY APPROVED BY NBH

DATE December 1957

PREPARED FOR C.S.A. Oommittee on Gas Burning

Appliances and Equipment

SUBJECT Comments on A.S.A. Z21.l3.l - 1956 ｾ

and Addenda Z21.13.1a - 1957

Vol. 1. Steam and Hot Water Boilers.

The above A.S.A. specification has been reviewed as a basis for the preparation of a corresponding C.S.A. specification. All references to American Standards are listed below, with

information on eXisting Canadian Standards where these exist. Referenc'e is made also to ｩｴｾｭｳ which are pO,tentially in conflict with existing Canadian Codes such as the National Building Code, 1953. All specified t,emperatures are listed as a convenience in further consideration of this specification.

Standards

Canadian Standard

No

C.S.A. Probably use A.I.S.I.

( For private residences, ( Sec. IV. A.8.M.E. ( Boiler and Pressure ( Vessel Code.

( For other than private ( residences C.S.A. (B51 - 1957.

A.S.A. Bl.l - 1949 C.S.A. BIoI - 1949 A.S.A. B36.10 - 1950 ( C.S.A. B62 - 1949

( C.S.A. B63 - 1949 A.I.S.I CI0I0 )

A.I.S.I 416 ) American Standard

Sec. IV. A.S.M.E Boiler and Pressure Vessel Code ｾｾ［ＬｾｾｾＭｾＮｾ /"-:-

-ｴ｜ｲＮＺｬｾｾｾｊ Paragraph 2 1.5.3 ) 6 1.13.1 ) 2 1.5.8 l(Addenda) 1.8.11 2(Addenda) 1.19 ) 8 ＱｾＲｬ ) 14 1.27.4 ) 14 1.27.5 ) Page 1

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2

-Electrical equipment, wiring, motors

Page Paragraph

8-12 1.22 Instead of A.S.A. C1 - 1956 use C.S.A. C22.2 and C.S.A. C22.1 - 1953 (should be checked with Electrical Code Committee)

American Standard Listing Requirements

d e

Page Paragrapl;1 .Code Number Title

'4 1 •.$02

Z21.2o

-

1951 Automatic pilots

4 1.11.2 Z21'.1·5

-

19t.i4 Qas valves

7 1.15.1 Z'21.21

-

19$2 ;Autdmat1c valves to!'

gas ｡ｰｰｬｾＬ｡Ｎｮ｣･ｳ ,

7 1.16.2 Z21.18 - J:955 Domes'tic ,gas appliance pnes!sure ;r$gulators

1 1.17.1 'Z21.35

-

_ＱＹｾＵ Gum p:votecyive ､･ｶｾ｣･ｳ

These references 'will presumably be changed to the corresponding C.S.A. Standards when'they ｡ｾ･ complete.

Miscellaneous 1. Sheet metal gauges

In the above standard sheet metal thicknesses are given in inches. There is no Canadian Standard on sheet metal gauges, although at present C.G.S.B. is working on gauging. The 1953 National Building Code refers to U.S. Standard gauge.

2. Pipe sizes

Weights and dimensions of nominal pipe sizes in A.S.A. B36.10 - 1950 differ slightly in the smaller sizes from those

Qf C.S.A. B62 - 1949 and C.S.A. B63 - 1949.

Pipe threads are presumably in accordance with ｾＮｓＮａＮ B2.1 -1945 (no C.S.A. Standard)

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3.

Wire screen

Paragraph

1.14.3 No. 40 mesh brass, aluminum or equivalent. This is equivalent to 420 microns mesh as specified in

C.G.S.B. 8-GP-1a.

4.

Test gases

Are Canadian test gases the same? 5. Definitions

Draft hood - ､ｾｦｦ･ｲｳ from N.B.C. Floor furnace - differs from N.B.C. Flue - differs from N.B.C.

Heating value (total) - higher calorific value. Others refer to lower calorific value.

Minimum melting_point of materials ｾＵＰｯｆ

and ll000_F

Maximum temperature on aluminum tubing 700°F

Minimum melting point of materials 10000_F

Minimum melting point of materials l4500_F

Maximum temperature rise above inlet air temperature (various metals)

29 2.17

5(Addenda) 2.18

ｍ｡ｸｾｭｵｭ temperature rise above room temperature (various metals)

Temperature limit controls maximum setting of 250°F

( Maximum temperature rise at 6" from 'boiler ( 90°F above inlet air temperature, i.e. ( 160°F for air at 70°F

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4

-6. Temperatures (continued) Page

30

33

Paragraph

2.18 Maximum flue gas temperatures

480°F

above inlet air temperature, i.e.

550°F

for air at

70°F

Maximum temperature on adjacent

combustible material, 90°F above inlet air temperature, i.e.

160°F

for air at 70°F

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Agreement with 1953 National Building Code

There appears to be general agreement between the above two works, except as follows:

1. Scope

The N.B.C. requirements for Boilers and Furnaces, Section 6,2.3.2 apply to hot water boilers up to only 30 lb per sq in. operating

pressure (see 6.2.3.2.1) whereas the A.S.M.E Code referred to in

ｾｨ･ American ,Standard, paragraphs 1.19 and 1.21, extends to boilers operating with 160 1b per sq in. pressure but with limiting

temperature o£ 25QoF. 2. Metals

The N.B.C. 'does not detail metal composition and sheet thick· nesses as does the American Standard.

3. Temperatures

Paragraph 2.11.2 in the American Standard permits a temperature which may be higher than N.B.C. requirements.

4.

Controls

The N.B.Co requirements for controls for gas firing, Section

6.2.3.8.5 may be stricter than in the American Standard. Note, for example, the last paragraph of this section requiring shut-off upon drop in pressure with L.P.G.

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6

-5. Location of manual shut-off valve

The N.B.C. (6.2.3.8.5) requires this to be "near the entrance to the room where the gas burner is 10cated.TI

The A.S.A. (1.12.1, p.4) requires this to be only Itreadi1y

accessible."

.

6. Shut-off valve for low pressure safetI

The N.B.C. (6.2.3.8.5) requires furnaces using L.P.Gas to be equipped with positive shut-off at gas pressures below

t

Ib/sq in. The A.S.A. has no such requirement.