BS 336 1989 fire hose couplings and ancillary equipments

I
BS
336
:
1989
UOC
621.643.41
5
:
614.843.2
:
.002.7
:
001.4
:
006.31.8
:
620.1
@
B~sh
Standards
Institution.
No
part
of this publication
may
be photocopied
or
otherwise reproduced
without
the prior permission in writing

of
BSI
British Standard Specification for
Fire hose couplings and
a
ancillary equipment
Raccords de tuyaux d'incendie et matCriels connexes
-
SpCcifications
Feuerloschschlauche und Zubehor
.
British Standards Institution
Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI
BS
336
:
1989
Foreword
This British Standard has been prepared under the direction
of the Fire Standards Committee.
It
supersedes
BS
336
:
1980 which
is
withdrawn.
Although dimensions are given in metric terms, screwed and
instantaneous couplings and connectors manufactured in

accordance with this specification will be interchangeable
with existing couplings.
In this edition the figures are included in the main body
of the specification,
so
that reference may be made readily
to
a
requirement in the
text,
and to the relevant informa-
tion in tables and figures. In the 1980 edition the figures
were grouped after the main text. The number of drawings
has been reduced by combination,
so
that information
is
presented more compactly.
Table
1,
which specifies the various materials used for the
different components
is
presented in
a
more compact
arrangement, intended to improve
ease
of cross-reference
where

it
is
desired to use the minimum number of materials
for
a
range of components.
A minimum bore for delivery hose couplings
is
now
specified, which will
assist
users in specifying hose repair
tools, which have to pass through the couplings. A third
method of hose fixing
is
specified. Requirements for
a
suction hose wrench and controllable branchpipes are
included, and some changes have been made to dimensions
and tolerances to correct inconsistencies. More precise
definitions of blank
caps
and plugs have been incorporated.
The possibility of introducing an alternative design (the
so-called drop-through type) of suction hose coupling was
considered. However, these designs necessarily have smaller
tail
diameters not suitable for use with hose of the standard
dimensions of
BS

3165.
It
was therefore decided not to
include these alternatives in this revision.
Delivery hose components are suitable for use with hose
complying with BS 6391 and suction hose components
are suitable for use with hose complying with BS 31 65.
As with previous issues, most of the products dealt with
in this revision may be made of aluminium alloy, or copper
alloy. Zinc-aluminium alloys have been introduced for
some applications. Certain
of
the zinc-aluminium alloys
specified are suitable for use in hazardous locations where
other aluminium alloys, because they can produce
a
spark
when struck with other materials, cannot be used.
Copper, copper alloy and plastics components also are
spark resistant.
Compliance with a British Standard does not of itself
confer immunity from legal obligations.

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Contents
0
0
1
0
,

Foreword
Committees responsible
Specification
Section one. General
1
Scope
2
Definitions
3
Materials
4
Manufacture
5
Pressure retention
6
Marking
Section two. Specific requirements
7
Delivery hose couplings
8
Delivery hose connectors
9
Dividing and collecting breechings
10
Standard branchpipes
11
Integral and controllable branchpipes
$2
Nozzle spanners
13

Blank caps, plugs, and chain
14
Standpipes
15
Hydrant key and bar
16
Suction hose couplings
17
Suction collecting heads
18
Suction strainers
19
Suction hose coupling wrench
20
Foam inlet adaptors
(
BS
336
:
1989
Page
,Page
Inside front cover
Tables
Back
cover
1
Choice of materials
3
2

Dimensions of delivery hose coupling
tails
10
3
Size
of expansion ring fittings
4
Nominal alternative
sizes
of nozzles for
11
2
branchpipes
13
2
2
5
2 5
Suction hose coupling dimensions
21
2
coup1
i
ngs
22
6
Work
sizes
and permissible deviations of
round form screw threads for suction hose

7
Sizes
of basket strainers and lengths of cord
23
Appendices
A
Tests on instantaneous delivery hose couplings
and branchpipes in plastics materials
B Hydrostatic
test
for pressure retention
C
Spanner
test
D
Strength
test
for standpipes
E
Strength
test
for hydrant keys
F
Reverse flow
test
for collecting heads
G
Strength
test
for suction hose coupling wrench

6
12
13
13
15
15
16
16
16
16
21
22
23
23
26
26
26
26
26
27
27
Figures
1
Delivery hose couplings
-
general arrangement
2
Delivery hose couplings
-
female details

3
Delivery hose couplings
-
male details
4
Delivery hose couplings
-
tail
details
5
Delivery hose couplings
-
expansion ring
details
6
Delivery hose connector
7
Dividing and collecting breeching
8
Branchpipe
9
Nozzle for branchpipe
10
Integral branchpipe
11
Nozzle spanner
12
Standpipes
13
Hydrant key socket

14
Suction hose coupling
-
general arrangement
15
Suction hose coupling
-
details
16
Suction collecting heads
17
Metal suction strainer
18
Basket strainer for suction strainer
19
Suction hose coupling wrench
20
Foam inlet adaptor
7
8
9
10
11
12
13
14
14
15
15
17

18
18
19
20
22
24
25
25
1
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BS
336
:
1989
Specification. Section
one
Section one. General
1
Scope
4
Manufacture
This British Standard specifies requirements for couplings,
connectors and other components for use with delivery
hose complying with BS
6391
and with suction hose
complying with
BS
31 65,
and suitable for firefighting

purposes.
It
also applies to other items of equipment asso-
ciated with the use of firefighting hose.
The pressure retaining components are suitable for use
at
working pressures not exceeding
15
bar*.
NOTE. The
titles
of the publications referred to in this standard
are listed on the inside back cover.
2
Definitions
For the purpose of this specification, the definitions given
in
BS
4422
apply, together with the following:
2.1 blank cap.
A
component that fits on to
a
male delivery
hose connector or suction connection and complies with
the pressure retention and other appropriate requirements
of this specification.
2.2 blank plug.
A

component that fits into
a
female
delivery hose connector or suction connection and complies
with the pressure retention and other appropriate require-
ments of this specification.
NOTE. Dust covers, sometimes used to cover connectors, may not
be capable of complying with the pressure retention requirements.
3
Materials
The material for each component shall be chosen from the
list
of permitted materials given either in table
1
or in the
relevant clause.
NOTE
1.
The choice of materials should be made with due regard
to possible corrosion, particularly bimetallic corrosion where
different metals are in contact. Temporary, occasional contact of
different metals in
two
components connected during use
is
not
a
problem, butwhere different metalsare used in the same component
severe corrosion may occur. In particular aluminium and
its

alloys
are liable to corrode when in contact with copper
or
its
alloys,
and where there
is
such contact suitable measures should be taken
to prevent corrosion.
Particular care should be exercised in the selection of materials for
use in marine environments where the water to be used in the fire
'hose may be seawater. Attention
is
drawn to
BS
MA
18
and
'
BS
MA
60.
NOTE
2.
Materials should be free from toxic substances and should
not give rise to
taste,
odour, cloudiness or discolouration of the
water or foster any micro-biological growth.
NOTE

3.
It
is
acknowledged that materials other than those given
in table
1
may be used for couplings and that these may otherwise
conform to the standard, but the use of these other materials
is
outside the scope of the standard.
NOTE
4.
The purchaser should be advised that
as
far
as
possible the
coupling of copper or copper alloy components to aluminium alloy
or zinc-aluminium alloys should be avoided, particularly where
contact
is
for long periods,
as
electrolytic action and consequent
corrosion may result. He should also be advised that
it
is
preferable
to wash
all

products with fresh water after use or contact with
sea
water or brackish water.
4.1 Castings and mouldings
Castings shall be clean, sound and free from gross porosity,
cracks and other surface imperfections.
No
filling or
similar after-treatment of castings shall be carried out
without the approval of the purchaser.
NOTE.
On
diecast fittings and plastic injection mouldings where
a
bore
is
shown
as
parallel,
a
reasonable taper should be allowed
,
to facilitate core withdrawal, but this taper should be kept to the
minimum required for this purpose.
4.2 Welding
Welds shall be free from lack of fusion, cracks,
non-metallic inclusions, porosity and
cavities.
Welding of aluminium shall be in accordance with the
requirements of either

BS
3019
:
Part
1
or
BS
3571
:
Part
1,
according to the method of welding employed.
4.3 Finish
Machined surfaces, unless otherwise specified, shall be of
grade
N7
assessed in accordance with
BS
11 34.
NOTE
1.
Assessment may be made using roughness comparison
specimens calibrated in accordance with
BS
1134
with the agree-
ment of the purchaser.
When aluminium
is
used for exposed surfaces they shall

have
a
sealed anodized finish, of thickness not
less
than
grade
AA
15,
specified in accordance with the methods
described in
BS
161 5
or
BS
5599.
Where chrome plating
is
used
it
shall be in accordance with BS
1224.
Parts not machined shall be finished clean
as
cast.
NOTE
2.
All burrs and sharp edges should be removed. Waterways,
particularly the bores of branch pipes and nozzles, should have
a
smooth finish. The exterior of

all
components should be sufficiently
rounded and smooth to avoid injury during handling. Surfaces in
contact with hoses should be particularly smooth
so
as
to avoid
damage to the hose. All assembled threads of aluminium alloy and
zinc-aluminium alloy should be coated with suitable grease before
assem blv.
4.4 Permissible deviations
Unless otherwise specified, the deviations on
all
work
sizes
of machined parts shall be
f
0.25
mm.
NOTE. Permissible deviations have been specified where necessary
to enable components to be interchangeable, but
it
does not
necessarily follow that every work
size
and permissible deviation
has been specified. Where these are omitted the manufacturer
should use experience in determining what these should be and,
if
necessary, should consult the purchaser.

5
Pressure retention
The pressure retaining parts of delivery hose couplings,
suction hose couplings, delivery hose connectors, dividing
and collecting breechings, branchpipes, nozzles, standpipes,
blank caps and plugs, suction collecting heads and foam
inlet adaptors shall withstand without leakage or permanent
deformation
a
hydrostatic
test
pressure of
22.5
bar for
2
min when tested by the method described in appendix
B.
"1
bar
=
105
N/mZ
=
105
Pa.
2
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~
BS
336

:
1989
Section
one
I
I
Table
1.
Choice
of
materials
I
0
0
0
Material and relevant British Standard number
Product
Aluminium
all
Plastics
Other
I
I
C106
Copper and copper alloys
S
LM6
M
1490
-

5251
H4
1470
-
LM16
TF
1490
-
LM25
TF
1490
-
DCBl
1400
-
-
X
-
DCB3
1400
-
-
X
-
LG2
1400
-
-
X
6082

T6
1474
6082
TF
1471
cz121
cz122
5056A
0
or
HZ
1473
5154A
CZ107 CZ108
2870
cz112
IN
i2
473
H2
1470
2870 2870
2872
-
-
X
2872
-
-
X

2874
-
-
X
2873
See
Note
2
-
2874
X
See
Note
3
See
Note
3
Clause Figure
reference reference
~ ~~
Delivery hose couplings
X
X
See
Note
4
X
X
See
Note 5

7
1 to5
Delivery hose connectors
Breechings
X
See
Note
4
X
X
X
X
X
X
X X
X
Branchpipes, metal
10,ll
I
8
Nozzles for branchpipes
10
19
Branchpipes (plastics)
I
l0
11
See
Note
5

I
I
-
X
-
X
Steel
Spanners for nozzles
Blank caps and plugs
Chains and
‘S’
hooks
Standpipe shaft
Standpipe base and head
X
-
X
-
X
X
~
X
X
X
See
Notes 4
and 6
l3
I-
X

+
-
X
-
X
+
X
X X X X
X X
15
I
13
X
-
-
X
X
Hydrant keys and bars
Suction hose couplings
Suction collecting heads
X
-
X
X
-
X
See
clause 15
T
14,15

*
X
X
-
X X
X
X X
X
X
X
X
I
I
1
X
X
-
X
X
-
X
X
-
X
X
-
X
X
-
X

X
See
Note 7
X
X
Suction strainer
Strainer and ends
Rivets
X X
X
X
18.1
17
X
X
X
Basket strainer
18.2
.
I
18
See
18.2
Suction hose wrenches
19
I
19
Galvanized
mild
steel

-
X
-
X
Foam inlet adaptor
20
I
20
X
-
X
-
X
-
X
-
X
See Note 9
Springs and circlips
I
t
_I
I
Steel
See
Note 1
Nashen
NOTE 1.
See
7.4.8.4. 10.1, 14.2,16.2

or
18.1.4.
NOTE 2. Should not be used with aluminium products.
NOTE 3. Of
a
gauge suitable for welding.
NOTE 4. For coupling release housings
only.
NOTE 5. Any plastics material complying with
7.1.4
or
11.3
may be used for the body, but the release plunger
is
always made
Jf
metal
(see
7.1.5
and
11.4).
NOTE 6. Steel (chrome or cadmium plated).
NOTE 7. Coupling parts of aluminium alloy collecting heads are types LM16-TF or LM25-TF. Combinations of these alloys
Nith the specified copper alloys are permissible.
NOTE 8. Expansion rings only.
NOTE 9. Anodized. See
4.3.
4
3
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BS
336
:
1989
Section one
0
e
e
6
Marking
6.1
Each product shall bear legible and permanent marking
to identify the manufacturer and year of manufacture.
NOTE. This may be by the use of
a
symbol or letter code, with
a
number to indicate the year, for example
'A/88'.
'A'
being the
manufacturers code letter and
88
indicating that the product was
made in
1988.
6.2
The manufacturer shall either:
(a)
mark the product

'BS
336
:
1989'
or
(b) alternatively indicate by certificate, packaging or
literature that the product conforms to
BS
336
:
1989.
NOTE. Each of the options
(a)
or (b) carries the same degree of
responsibility.*
"Marking
BS
336
:
1989
on or in relatio
0
to
a
product represents
manufacturer's declaration of conformity,
i.e.
a
claim by
or

on behalf of
'the manufacturer that the product meets the requirements of the standard. The accuracy of the claim
is
therefore solely the responsibility
of the person making the claim. Such
a
declaration
is
not to be confused with third party certification of conformity, which may also be
desirable.
h<
r
5

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BS
336
:
1989
Section
two
Section
two.
Specific
requirements
7
Delivery
hose
coup1
ings

7.1
General
7.1.1
Delivery
hose
couplings shall be of instantaneous
pattern
as
shown in figure 1 and shall be in accordance
with the relevant figures specified in
7.1.2, 7.1.3
or
7.1.4,
except that the release mechanism may be of the twist-
release type instead of the pull-release type shown in the
figures. Work
sizes
for the lettered dimensions in figure 4
shall be in accordance with table
2,
and
sizes
for the
lettered dimensions in figure 5 shall be in accordance with
table
3,
according to the
size
of hose to be accommodated.
NOTE. These figures are drawn with tailpieces for

70
mm hose.
Although tailpieces will vary as shown in table
2,
all other
dimensions remain the same for all sizes of hose. When tailpieces
are above or below
73
mm the change of bore should be gradual
to prevent unnecessary pressure
losses
and the design should be
at the manufacturer's discretion.
7.1.2
Multi-serrated type couplings shall be in accordance
with the following figures:
(a)
Figure 1
(a)
for overall general arrangements.
(b) Figures 2,4(b), 4(d) for female half-couplings
and washers.
(c)
Figures
3,
4(b), 4(d) for male half-couplings.
7.1.3
Ribbed type couplings shall be in accordance with
the following figures:
(a)

Figure 1 (b) for overall general arrangements.
(b) Figures 2,4(a), 4(c) for female half-couplings
and washers.
(c) Figures 3,4(a), 4(c) for male half-couplings.
7.1.4
Expansion ring type couplings shall be in accordance
with the following figures:
(a)
Figure 1
(c)
for overall general arrangements.
(b) Figures 2 and 5 for female half-couplings and
washers.
(c) Figures 3 and
5
for male half-couplings.
7.1.5
Where
a
coupling
is
manufactured from
a
plastics
material
it
shall
show no visible damage nor permanent
deformation when tested
as

described in appendix A.
7.1.6
The release plunger shall always be made of metal.
7.2
Locking
of
plungers
Nuts
on
plungers shall be of the self-locking type.
NOTE.
'Peening' over the end
of
the shank is not regarded as an
efficient means of locking the plunger.
7.3
Plunger springs
Plunger springs shall be of such strength that they can be
compressed to
a
length sufficient to free the plunger from
engagement by
a
force of not
less
than 45 N and not more
than
65
N.
7.4

Washers
Coupling washers shall have the dimensions given in
figure 2(a) and shall be of natural rubber (grades Y40,
240) to
BS
1154 or chloroprene (grade C40) to
BS
2752.
Expansion ring washers shall be of an elastomer of
maximum shore hardness 70. The tolerances on the stated
dimensions shall be in accordance with class M3 of
BS
3734.
i
6
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BS
336
:
1989
Section
two
(a) Serrated tail type
Release
, Washer
(c)
Expansion ring type
Figure
1.
Delivery

hose
couplings
-
general arrangement
Release
rWasher
coupling
(b) Ribbed tail type
7
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BS
336
:
1989
Section
two
t-d
12.8
sq
*0.1
0
I
(a) Metal
cl
L9.5
W-
sher
n
sq
-

i,
.1
R0.8
9t-J-
Release
plunger
*0.2
+
0.25
Hole
dimension
13.
2
0
x
16.17
0
to
accept release
bolt
3
rnin
(b)
Plastics
All
dimensions
are
in millimetres.
tR4.5
-

1-5.6
12.32
12.45
1
15.62
R1
15.75
Figure 2. Delivery hose couplings

female details
Re,ease
plunger
8
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BS.336
:
1989
Section
two
23
rnin
RL
m
390
c
30*51
le11.320.1
(a)
Metal
b-11.3

2
0.1
1
30.5
-j
(b)
Plastics
All
dimensions are
in
millimetres.
NOTE.
For
tail design see figure
4.
Figure
3.
Delivery hose couplings
-
male details
9
,
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BS
336
:
1989
Section
two
Tail external

diameter
A
mrn
38.1
44.5
50.8
63.5
69.9
-76.2
88.9
Table
2.
Dimensions
of
delivery hose coupling tails (figure
4)
I
I
I
I
External diameter Internal diameter, multi-serrated
between ribs and ribbed
B
c
Metal
Plastic
mrn
rnrn
mm
35.7 26.6 27

42
.O
32.9 33
47.6 38.5 39
60.3 51.2 52
65.9 56.8 58
72.2 63.1 65
84.9 75.8 77
Nominal size
Permissible deviation
Nominal
hose
diameter in
0s
6391
+0.8 +0.25 +3
.O
0
0
-0.25
0
-3
7,
2 2
3/4
1/2
3
1/2
rnrn
40

45
50
65
70
75
90
ZOO?
2O
20°?
Z0
9.51
(a)
Ribbed tail (metal)
2O0t
Z0
ZOO?
Z0
(c) Ribbed tail (plastics)
All
dimensions are in millimetres.
NOTE.
See table
2
for
lettered dimensions.
A
r3"'
2o
(b) Multi-serrated tail (metal)
._

67
min.
(d) Serrated tail (plastics)
Figure
4.
Delivery hose couplings
-
tail details
0
e
0
10
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BS
336
:
1989
G
Washer
outside
diameter
mm
48.4
54.7
64.3
77.0
83.3
89.7
k0.25
Section

two
H
Washer
internal
diameter
mm
39 .7
46.0
52.4
65.1
71.4
77.8
t0.25
E
Recess
width
F
Coupling
bore
mm
3.2
3.2
4
.a
4
.a
4
.a
4
.a

mm
34.9
34.9
41.3
41.3
41.3
41.3
mm
6.3
6.3
7.9
7.9
7.9
7.9
mm
38.5
44.8
51.2
54.0
54.0
54.0
Table
3.
Size of expansion ring fittings
q-r
width length
1
I
IJ
K

Ring
length
I
I
Diameter
of
hose
(see
BS
6391
)
A
Lip
diameter
8
Washer
recess
diameter
4.8 44.5
6.3 50.8
in mm
1
l/z
40
2
50
2l/z 65
23/4 70
3 75
13/4 45

mm
48.3
54.6
64.3
77.0
89.7
83.3
mm
31 .7
31 .7
38.0
38.0
38.0
38.0
See
NOTE
2
Io
-0.25
Permissible
deviation
k0.25 i0.25
t0.25
-
1
NOTE
1.
Dimensions are not given for the
3
'/z

in
size.
NOTE
2.
Requirements for dimension
A,
the lip diameter, should be obtained from the purchaser. Consideration should be given to
the nominal bore and wall thickness
of
the hose and their tolerances, and to any allowance required to aid assembly.
NOTE
3.
Where standard
'0'
rings are used in place
of
square section washers, the diameter
of
the washer recess may be adjusted to
accommodate these.
0
6
x
equally
spaced
@I
.5
min.
(1.63)
0

0
Edges
to
be
broken
\
All dimensions are in millimetres.
NOTE. See table
3
for lettered dimensions.
Figure
5.
Delivery hose couplings
~
expansion ring details
11
{;\
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BS
336
:
1989
Section
two
8
Delivery hose connectors
8.1
General
Unless otherwise ordered delivery hose connectors shall
be of the single lug twist-release instantaneous pattern

as
shown in figure
6
and shall have the dimensions given in
figure
6.
NOTE.
The purchaser should be asked to state whether connector
ends are to be screwed or are to be suitable for welding.
8.2
Locking
of
plungers
Nuts on plungers shall be of
a
self-locking type.
NOTE.
Peening over the end of the shank is not regarded as an
efficient means
of
locking the plunger.
8.3
Plunger springs
Plunger springs shall be
of
such strength that they
can
be
compressed to
a

length sufficient to free the plunger from
engagement by
a
force of not
less
than 55
N
or more than
110
N.
8.4
WasheCS
Washers shall have the dimensions given in figure 2 and be
of natural rubber (grades
Y40.240)
to
BS
11
54
or
chloroprene (grade
C40)
to
BS
2752.
0
12.7 -0.1
R0.8
25.6
-0.1

All
dimensions are in millimetres.
Figure
6.
Delivery hose connector
r
$J
80
*o
1
*G
1
12.8
i,
‘=This
welding
end
as
screwed required
or
by
for
the purchaser
12
Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI
BS
336
:
1989
Section

two
~
Table
4.
Nominal alternative
sizes
of
nozzles
for
branchpipes
Dimension Permissible Nominal alternative
from figures deviations sizes
9
and
10
mm mm
A
k
0.4 12.5, 15,20,25,30
9
Dividing and collecting breechings
Dividing and collecting breechings shall be constructed
as
shown in fiyre
7
and shall consist of
a
three-way branch
body
at

60
.
NOTE. The purchaser may require the breeching to incorporate
control devices.
Dividing breechings shall be provided with two female
outlets which shall be connectors of the single lug twist
release type
(see
clause
8)
and
a
single male inlet complying
with the appropriate parts of clause
7
and having the
dimensions given in figure 3(a).
Collecting breechings shall be provided with one female
outlet which shall
be
a
connector of the single lug twist
release type
(see
clause
8)
and two male inlets complying
with the appropriate parts of clause
7
and having the

dimensions given in figure 3(a).
0
0
<
10
Standard branchpipes
10.1
Standard branchpipes shall be made of metal and
shall be constructed
as
shown in figure
8.
The washer shall
be dressed leather, natural rubber (grade
70)
to
BS
1154.
or chloroprene rubber (grade C70) to
BS
2752.
10.2
Unless otherwise specified by the purchaser nozzles
for use with standard branchpipes shall be of the form,
finish and
size
shown in figure
9
and detailed in table
4.

Nozzles shall be indelibly marked with the
size
.
(dimension

A)
in numerals of height not
less
than
6
mm.
NOTE.
Alternative profiles to the type shown in figure
9
are
available. The purchaser may require the nearest metricated
equivalent of an imperial size to be supplied.
Coupling end may be integral,
welded or screwed
on
A-A
C
657.1
J
Figure
7.
Dividing and collecting breeching
All dimensions are in millimetres.
I
13

Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI
1
BS
336
:
1989
Section
two

115
min.
All
dimensions are in millimetres.
Figure
8.
Branchpipe
Parallel portion
only finish
N6
7
6
1.5
min
L7
6
min
I
G13i;'to
852779
All

dimensions are in millimetres.
NOTE.
For dimension
A
see
table
4.
Figure
9.
Nozzle
for
branchpipe.
0
60.8
-
0.5
across
flats
14
Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI
BS
336
:
1989
Section
two

1 1
Integral and controllable branchpipes
11.1

Integral branchpipes/nozzle units shall be made of
metal and/or plastics and shall be constructed
as
shown
in figure
10.
Nozzles shall be marked with the
size
(dimension
A)
in numerals of height not
less
than
6
mm.
11.2
Hand-held controllablebranch$pes shall be made
of metal and/or plastics. The means of controlling the flow
of water shall provide
a
shut-off jet facility and additionally
may provide
a
spray.
NOTE.
Other performance characteristics may be specified by the
purchaser but these are outside the scope of this British Standard.
11.3
Where
a

branchpipe
is
manufactured from
a
plastics
material
it
shall show no visible damage nor permanent
deformation when tested
as
described in appendix
A.
11.4
The release plunger shall always be made of metal.
12
Nozzle spanners
Spanners for nozzles on standard branchpipes shall be in
accordance with the details given in figure
11
and shall
show no visible damage or permanent distortion of the
jaw when tested
as
described in appendix
C.
I
225
min.
-
Figure

10.
Integral branchpipe
NOTE.
For tail dimensions see figure
3.
For dimensionA see table
4.
test
load
350N
All
dimensions are in millimetres.
c
Figure
11.
Nozzle spanner
e
175
-
15
4,
,
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BS
336
:
1989
Section
two
13

Blank caps, plugs, and chain
Blank caps and plugs shall be attached to the equipment
with which they are to be used by an
'S'
hook and chain
with brazed, welded or integrally cast joints
(see
figure 12).
NOTE. Unless otherwise specified by the purchaser blank plugs
for standpipes (see
14.4)
are non-vented. If venting
is
required
it
should be in accordance with
BS
5041
:
Parts
1
and
2.
14
Standpipes
14.1
General
A
standpipe shall comprise:
(a) a

shaft;
(b)
a
swivel head;
and shall be in accordance with figure 12.
14.2
Standpipe shaft
The standpipe shaft shall be fitted with
a
base having the
dimensions given in figure 12 and capable of engagement
with
a
fire hydrant complying with BS 750. The shaft
shall
also be fitted with
a
means of attachment to the swivel
head. The washer shall be dressed leather, natural rubber
(grade 270) to BS
11
54 or chloroprene leather (C70) to
BS
2752.
14.3
Swivel head
The swivel head shall be fitted with
a
means of attachment
to the shaft and shall have one

or
two outlets. Each outlet
shall be fitted with an instantaneous female connector
complying with the requirements of
8.1.
The bend in the
swivel head shall have
a
radius
at
the centre of the bend of
not
less
than 75 mm.
14.4
Blank plug
A
double outlet head
shall
be provided with
a
blank plug
(see
clause
13).
14.5
Means
of
attachment
The swivel head shall be attached to the shaft by one of the

following means
:
(a)
an instantaneous delivery hose coupling complying
with the requirements of clause
7
except
that
a
tailpiece
is
not required, or
(b)
a
gland that will allow continuous rotation of the
head through 360
O.
Where
a
delivery hose coupling
is
used the female coupling
shall be on the standpipe shaft.
15
Hydrant key and bar
15.1
General
The dimensions of the hydrant key socket shall be in
accordance with figure 13.
NOTE. The key is intended for use on hydrant valves complying

with
BS
750;
adaptors may be supplied for
use
on other hydrant
valves. The length of the key should be sufficient to allow the
bar to clear adjacent standpipes or other obstructions. The bar
should fit easily into the key eye.
15.2
Materials
The hydrant key and bar shall be made from one of the
following materials:
(a)
aluminium alloy,
as
detailed in table 1;
NOTE. These keys and bars may include some steel components.
(b)
all
stainless
steel
to BS 970
:
Part
4
as
follows:
key end 18/8
Cr,

casting
shaft tube
bar 431 S29
(c)
iron and
steel
as
follows:
321 S22 or 321
S20
key end
shaft tube
bar
605
M36 condition T
Malleable iron casting to BS 6681
CD
S2
to BS 6323
:
Part 1
to BS 970
:
Part 4.
15.3
Resistance to torsion and bending
The key shall not sustain any damage or permanent
deformation exceeding 2 when successively tested
___

by the
methods given in
E.l
(torsion)-and
E.2
(bending).
16
Suction hose couplings
16.1
General
Suction hose couplings shall be of the locking ring pattern
as
shown in figure 14 and shall be
in
accordance with the
details given in figures 15 and 16(c). Dimensions variable
with hose
size
shall be in accordance with tables
5
and
6.
16.2
Washer
Washers shall be of dressed leather, natural rubber
(grade 270) to BS
11
54 or chloroprene rubber (C70)
to BS 2752 and
shall

have
the
dimensions given
in
figure
15(a).
14.6
Strength
The standpipe shall show no damage or permanent
deflection when tested
as
described in appendix
D.
Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI
BS
336
:
1989
Section
two
Connector (see figure
6
and clause 8.1
1
Head
I
J
Instant a ne ou
s
coupling

7
'Bolt
or
screw jointed]
incorporating gland to
permit swivelling
Standpipe
shaft
End to suit method of
assembiy to standpipe
shaft
\
@
85.4
0
0
57.1
.5 22.5
i
0
7
~5.7-0.4
R
3.51
0
85.5
7
All
dimensions are in millimetres.
NOTE.

Leading and trailing edge feathers to be cut back to
2/3
thread thickness.
Figure
12.
Standpipes
17
Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI
BS
336
:
1989
Section
two
All
dimensions are in millimetres.
Figure
13.
Hydrant key socket
20
Minimum dimensions of
A*
1
I
61.4
I
69.4
Round
(@A)
Square

I
46.9
1
54.9
(A
sq)
“Giving minimum webs of
6
mm for steel and
10
mm
,
for aluminium alloy.
Secured
by
a screw,
M6
in accordance with
BS
4168
or
M6
in accordance with
BS
4219.
The screw shall be flush or recessed when-fitted.
I
II
v]
‘

Locking ring
Female
half
Figure
14.
Suction hose coupling
-
general arrangement
18
0
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BS
336
:
1989
0
0
0
0
Section
two
(a)
Washer
(b) Ribbed
tail
piece for female hose coupling
5
f
I
-

G
(d) Male hose coupling (ribbed
tail)
'The dimensions
of
the slots shall
conform to dimensions given in
table
3
of
BS
2090
:
1954.
(c) Locking ring
to
be
removed
F
i-"
f
U
(e)
Nut for female hose coupling
All
dimensions are in millimetres.
NOTE. For dimensions
A,
B,
C

and
D
see
table
6.
For other dimensions
see
table
5.
Figure
15.
Suction hose coupling
-
details
19
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BS
336
:
1989
Section
two
(a)
In-line pattern
3
threads
per
inch
A’
I

,I
.07
1
R1.85
/
R2.39
(c) Basic form of screw thread
for
suction hose coupling
(d) Radial pattern (plan)
All dimensions are in millimetres.
Figure.16. Suction collecting
heads
I
(b)
Angle pattern
I
View
A
(e) Radial pattern (elevation)
20
Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI
BS
336
:
1989
Section
two
16.3
Screw threads

16.3.1
Round thread.
The basic form of round thread
shall be
as
shown in figure 16(c) and the major and minor
diameter
sizes
shall be in accordance with figures 15(d),
16(c) and table 6.
16.3.2
'V'
thread.
The
sizes
and screw threads of the
locking ring and nut for the female half coupling shall be
in accordance with table
5.
The applicable tables and
permissible deviations
as
defined in
BS
1580 :'Part 1
:
1962
are
as
follows.

Component Table Limit and
Locking ring
Class
1A
Nut for female half coupling
Class
16
17
Suction collecting heads
17.1 General
Suction collecting heads shall be of one of the following
types:
(a)
in-line pattern
(see
figure 16(a)) fitted with
a
swivel outlet;
(b) angle pattern
(see
figure 16(b)) fitted with
a
swivel outlet;
(c) radial pattern
(see
figure 16(d) and 16(e)) fitted
with
a
fixed outlet.
NOTE. The design should be such

as
to
minimize restriction to
water
flow.
17.2 Outlet connections
Outlet connections shall be female screw thread for suction
hose in accordance with table 6 and figures 15(e)
and 16(c).
Table 5. Suction hose coupling dimensions (see figure 15)
Dimension
E
F
G
H
J
J1
K
K1
L
L1
M
N
P
PI
Q
R
S
S1
t

min
Thread*
Thread
#
Diameter
of
hose
75
mm
rnrn
77.8
71.4
89.0
25.0
92
.O
68.2
92
.O
93.7
68.2
69.9
95.0
110.0
171
.O
140.0
80.2
19.0
114.3

114.3
4
.O
3.90 in
3.90 in
'8UNS-1A
to
BS
1580,
table
36.
WUNS-1B
to
BS
1580,
table
36.
See
also
16.3.2.
100
mm
mm
103.2
96.8
114.0
38
.O
117.4
93.6

117.4
119.1
93.6
95.3
121.0
137
.O
197
.O
1 65.0
105.7
24.0
142.9
142.9
4
.O
4.90 in
4.90 in
140
mm
mm
141.3
134.9
152
.O
57
.O
155.5
131.8
155.5

157.2
131.8
133.4
159.0
175.0
235.0
203.0
143.7
24.0
181
.O
181
.O
4
.O
6.50
in
6.50 in
Deviation
~
mm
k0.4
k0.8
k0.8
k0.8
-0.8
0
+
0.8
0

-
0.4
0
-0.4
0
-0.4
0
+
0.4
0
k0.8
k0.8
k0.8
$0.8
+
0.4
0
20.8
20.8
20.8
+0.8
0
-
-
21
Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI
BS
336
:
1989

Section
two
Diameter
of
hose Male thread
Female thread
diameter diameter
in
3
4
5l/2
mm mm mm mm mm
(nominal)
75 92.0 91.6 81.4 93.2
100 117.4 117.0 106.8 118.6
140 155.5 155.1 144.9 156.7
C
minor diameter
mm
83.0
108.4
146.5
max.
I
min.
mm
82.6
108.0
146.1
75

100
140
~~~
NOTE. The recommended nominal
sizes
of
outlets are
as
follows.
Number
of
inlets
2
75
mrn
2or3
100
mrn
3
or
4
or
5
or
6
140
mm
Nominal
size
outlet

17.3 Inlet connections
Inlet connections shall be male instantaneous in accordance
with figure
3(a)
and shall be attached to
the
collecting
head by screwed ends, flanges or by welding.
The spacing between centres of inlet connections shall be
not
less
than:
115
mm for in-line pattern, and
134
mm for radial pattern.
17.4 Non-return
valves
Each inlet connection shall be fitted with
a
non-return
valve
which shall show no sign of visible water leakage
when tested
at
a
pressure of
1.7
bar
as

described in
appendix
F.
The non-return
valve
shall be either:
(a)
of the spring loaded mushroom type or
(b) of the flap
valve
type for in-line and angle pattern
collecting heads only. The
valve
shall open to not
less
250
110
350
140
450 180
than
60
and shall not open to any position where
it
may jam. The collecting head shall be marked 'TOP'
in letters of not
less
than
20
mm in height on the side

of the body
at
which the flap
valve
is
hinged.
18
Suction
strainers
18.1 Metal strainers
18.1.1
Materials shall be selected from those given in
table
1.
18.1.2
Metal strainers shall have the dimensions shown
in figure
17,
and shall be provided with
a
fixed outlet
having
a
female screw thread in accordance with table
6
and figures
15(e)
and
16(c).
18.1.3

The cylindrical perforated sheet shall have brazed
or welded seams dressed smooth on both surfaces,
and shall be not
less
than
1.50
mm thick. The end shall
be not
less
than
2.00
mm thick. The joints to the outlet
and to the end shall be riveted, welded or brazed.
18.1.4
The washer shall be of dressed leather, natural
rubber (grade
270)
to
BS
1154
or chloroprene rubber
(grade
C70)
to
BS
2752,
and shall have the dimensions
given in figure
15(a).
Hole

@
6
2
1
-I
Figure 17. Metal suction strainer
Nominal
size
The total area
of
holes should
not
be
less
than
5.75
times the
throat area.
All
dimensions are in miiirnetres.
22
Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI
18.2
Basket strainers
18.2.1
General.
Basket strainers shall be in accordance
with figure 18 and table 7 including method of connection
18.2.2
Baskets.

The strainer basket shall be of cane and
shall have six bottom sticks. The 75 mm
size
shall have
19 stakes, the 100 mm
size
21 stakes, and the 140 mm
size
23 stakes with three rod borders. There shall be three
rounds of upsetting, the first round having four rods.
There shall be
two
double body wales
at
the centre of the
75 mm and 100 mm
sizes
and four rounds of three rod
waling
at
the centre of the 140 mm
size.
There shall be
two rounds of waling under the border on each
size,
with four runner forming stakes.
NOTE
1.
The special terms used in 18.2.2 are defined in
BS

1133
:
Section 17.
NOTE
2.
Suitable types ofcane include Pelembang, Kooboo.
18.2.3
Sleeves.
The
sleeve
shall be constructed
as
shown
in figure 18. Brass
sail
eyelets and rings of one of the types
specified in
BS
3102 shall be fixed in the centre
of
each
hem and shall be equally spaced
as
follows:
(a)
6 eyelets each end for the 75 mm
size;
(b) 8 eyelets each end for the 100 mm
size;
(c) 10 eyelets each end for the 140 mm

size.
The ends of
all
cordsshall be whipped and stitched to
prevent fraying
.
Strainer
(nominal
size)
mm
75
100
140
18.2.4
Cord.
One long and one short cord of the lengths
given in table'7 shall be inserted in the eyelets of each
sleeve
and loosely tied to prevent detachment.
Dimension from figure
18
Basket strainer
Sleeve
A
B
C
D
E
F
Cord

X
Cord
Y
mm mm mm mm mm mm mm mm
178 127
305
185 203 197 1070 1830
203
159 406 216 229
229 1140 1900
241
-
197
508 254 267 267 1240 2000
Length of cord
-
(see
figure 18)
19
Suction hose coupling wrench
19.1
Form and length
A suction hose coupling wrench shall have
a
fixed jaw,
with an open yoke and
a
slotted pivoted jaw adjustable
to fit 75 mm, 100 mm and 140 mm suction hose couplings
(see

clause
16).
The overall length of the wrench shall be
not
less
than 500 mm.
NOTE. Typical wrenches are shown in figure
19.
The purchaser
may require the end of the bar to be formed.
19.2
Strength
A wrench shall not break nor suffer any permanent visible
distortion when subjected to
a
torque of 170 Nam,
as
described in appendix
G.
19.3
Material
Wrenches shall be made of galvanized mild
steel
(see
table 1).
20
Foam inlet adaptors
20.1
Materials shall be selected from the relevant column
of table

1.
Where aluminium alloys are used they shall
be anodized in accordance with
4.3,
because of their
higher susceptibility to atmospheric corrosion.
20.2
The adaptor end shall be in accordance with figure 20
with deviations of
*
0.8 mm.
NOTE. Details of requirements for the other end of the adaptor
should be obtained from the purchasers.
I
Table
7.
Sizes
of
basket strainers and lengths
of
cord
I
I
'*
I
'!t
BS
336
:
1989

Section
two
23

Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI
BS
336
:
1989
Section
two
@A
Basket strainer
end
911
brass eyelets
spaced equally not
less than
76
apart
Enlarged details
of
joint in sleeve
76
hem as detail
SI
eeve
Enlarged detail
of
hem at each

end
of
sleeve
[Length
of
cord
X
1
Length cord
of
cord
Y
General assembly
of
Basket strainer
All
dimensions are in millimetres.
NOTE.
For dimensions
A
to
F
and for
X
and
Y
see
table
7.
Figure

18.
Basket strainer
for
suction strainer
Licensed copy:RMJM, 30/08/2005, Uncontrolled Copy, © BSI