Bsi bs au 110a 1995 (1999)

BRITISH STANDARD BS AU 110a 1995 Specification for Rubber hoses and hose assemblies for automotive air pressure braking systems UDC 629 3 02 592 5 62 462 036 4 BS AU 110a 1995 This British Standard, h[.]

Specification for

U C6 9.3.0 -5 2.5:6 -4 2-0 6.4

This Bri sh Stan ard, ha ing

b en pre ared u der the

directonof the Sector Bo rd for

Materials an Chemicals,was

published u der the authoriy

ofthe Stan ards Bo rd an

comesinto efect on

1 Decemb r1 9

© BSI 0 -1 9

Fir t published Octo er1 6

Secon edi on Decemb r1 9

The folowing BSI references

relate to the work on this

stan ard:

Commi e reference P I/66/ 2

Draft for comment9 / 30 4 6 DC

ISBN 0 5 0 2 6 2 5

The prep ration of this British Stand rd was entrusted b Technical

Commit e PRI/66, Hoses, to S bcommit e PRI/66/ 2, Hoses and tubing for

internal combustion eng ines, upon which the folowing bodies were

represented:

British Rub er Man facturer ’ Association Ltd

LP Gas Association

Ministry of Defence

Society of Motor Man facturer and Tra er Limited

Co-opted Member

Am endm ents is ued sinc publ cation

Pag e

Ta le A.1 — Dimensions of hose test pieces an former 3

This British Stand ard has be n prep red b Subcommit e PRI/ 66/ 2 It

super ed es BSAU1 0:19 5, which is withd rawn

This rev ision bring s the specification broa ly into l ne with SAEJ14 2 [ 1] a

specification to which a proportion of this ty pe of hose is man factured in the UK,

but this British Stand rd specifies hig her operating temperatures

The specification has be n improv ed b the a d ition of sev eral tests and more

string ent requirements so that the stand rd more ac urately reflects cur ent

d emands and the product is bet er a le to car y out its safety c itical fu ction

A British Stand ard d oes not purport to includ e al the neces ary prov isions of a

contract User of British Stand rd s are responsible for their cor ect a plcation

Com pl anc with a British Standard does not ofitself confer im m unity

f om leg al o l g ations

Sum mary of pag es

This document comprises a f ont cov er, an insid e font cov er, p g esi andi ,

p g es1 to6, an inside b ck cov er and a b ck cov er

This stand rd has be n up ated ( se copy rig ht d ate) an ma hav e ha

amendments incorporated This wi l be indicated in the amendment ta le on the

inside f ont cov er

1 Scope

This British Stand rd specifies the dimensions,

construction an per ormance requirements for two

ty pes of hose an hose as embles used in al p rts

of air pres ure brake sy stems

NOT Both ty es are desig ned for o eraton at a ma imum

working pres ure of1 5b r, an are distng uished b their

recommen ed temp rature rang es of o eraton

2 Ref r nces

2.1 Normative referenc s

This British Stand rd incorporates, b d ted or

u d ted reference, prov isions fom other

publcations These normativ e references are ma e

at the a propriate places in the text and the cited

publcations are lsted on the inside b ck cov er.For

d ated references, only the ed ition cited a ples; any

subsequent amend ments to or rev isions of the cited

publcation a ply to this British Stand ard only

when incorporated in the reference b amendment

or rev ision For u d ated references, the latest

edition of the cited publ cations a pl es, tog ether

with any amend ments

2.2 Inform ative referenc s

This British Stand rd refer to other publcations

that prov id e information or g uid nce Editions of

these publcations cur ent at the time of is ue of this

stand rd are l sted on the insid e b ck cov er, but

reference should be ma e to the latest ed itions

3 Definitions

For the purposes of this British Stand rd the

d efinitions g iv en in BS3 5 a ply , tog ether with

the fol owing

hose as em bly

hose with either permanent or reusa le end fit ing s

at ached

4 Types

There are two ty pes of hose for use within the

fol owing temperature rang es:

a) type A ; for use within the temperature

rang e – 4 °C to+1 5°C;

b) type B ; for use within the temperature

range – 4 °C to15 °C

5 Construction

The hoses shal consist of:

a) a rub er l ning with smo th bore and resistant

to oi;

b) a texti e reinfor ing lay er or lay er , pl ed,

braided or spiral y wou d ;

c) a rub er cov er resistant to oi and

hy d rocarbons, ag eing and o one

The lning an cov er shal be f e f om holes,

porosity and other defects

NOT The hoses ma b eiher man rel or non-man rel made

an finished smo th or fa ric marked

6 Dimensions and tolerances

6.1 Diameter

W hen measured in ac ord ance with BS EN24 71

the internal and external diameter shal be as

g iv en in Ta le 1

6.2 Lim its on cut leng ths of hose

NOT The nominal leng th of hose should b sp cified b the

pur haser

W hen measured in ac ord nce with BS517 -101.2

the tolerance on cut leng ths shal be±1%of the

nominal leng th

6.3 Minim um bend ra ius

The minimum bend ra ius for instal ation shal be

as g iv en in Ta le 2

Ta le 1 — Dim ensions and toleranc s of

diam eter

Ta le 2 — Minim um bend ra ius

7 Conditioning

Tests g iv en in8.1to8.1 shal be car ied out on test

pieces taken f om hoses or hose as embles that

hav e underg one the folowing water immer ion

conditioning

The hose or hose as embly shal be immer ed in

disti led water at ( 23±2)°C for ( 16 ±2)h whi e

bent to the minimum ben ra ius g iv en in Ta le 2

The hose ends an couplng s shal be completely

ca ped during immer ion

Dimensions in milimetres

Nom inal

inte nal

diam ete

Tole anc

on inte nal

diam ete

Nom inal

exte nal

diam ete

Tole anc

on exte nal

diam ete

6.3

10.0

1 5

14.0

16.0

±0.4

±0.4

±0.5

±0.5

±0.5

16.0

19.0

2 2

25.4

27.0

±0.5

±0.5

±0.6

±0.6

±0.6

Dimensions in milimetres

Nom inal inte nal diam ete Minim um bend ra ius

6.3

10.0

1 5

14.0

16.0

6

8

102

10

1 4

8 Per orma nce

8.1 Resistanc to ag eing

W hen tested in ac ord nce with Annex A, the hose

shal show no sig ns of c acking , char ing or

disinteg ration, either internal y or external y

8.2 Low tem perature flexibi ity

W hen tested in ac ord ance with method B of

BSEN24 72:19 3 at a temperature

of (–4 ±2)°C, the hose shal show no sig ns of

c acking when ex mined v isualy , an shal

conform to8.4

8.3 Chang e in leng th

W hen tested in ac ord nce with BS517 -101.2,

using an a pled pres ure of15.5b r

)

the

ma imum chang e in leng th shal be in the

rang e –7% to+5%

8.4 Pro fpres ure test

when tested in ac ord nce with BS517 -102.1 the

hose or hose as embly shal not leak o show sig ns

of faiure at a hy d rostatic pres ure of31 b r

8.5 Bur t pres ure test

when tested in ac ord nce with BS517 -102.1 the

hose or hose as embly shal not bur t, leak or show

sig ns of fai ure at a hy d rostatic pres ur e les

than62 b r

8.6 Air leak

W hen tested in ac ord nce with Annex B the hose or

hose as embly shal show no leakag e on v isual

ex mination

8.7 Swel test

A test piece taken fom both the lning and cov er

after immer ion in oi no.3in ac ord nce with

BS9 3-A16 at ( 10 ±2)°C for ( 70±2)h shal show

a v olume inc ease of not more than10 %

8.8 Adhesion

W hen tested in ac ord nce with BS EN28 3 , the

loa req uired to sep rate any lay er shal be a

minimum of1.4kN/m

8.9 Ozone resistanc

W hen tested in ac ord nce with method1 of

BSEN27 26:19 3, no c acking shal be v isible

when the test specimen is ex mined

u der2× mag nification

8.10 Neutral salt spra test (a pl es to hose

as em bles only)

W hen tested in ac ord nce with BS7 7

for( 96±2)h, the hose as embly shal show no b se

metal cor osion

8.1 Flexure test (a pl es to hose as em bl es

only)

W hen tested in ac ord nce with Annex C the hose

as embly shal not fai before one mi ion flex cy cles

hav e be n completed

9 Ma rking

Each leng th of hose shal be d ura ly marked at

interv als of not more than25 mm with the

fol owing information:

a) man facturer’s name or identification;

b) n mber of this British Stand rd;

2)

c) ty pe ( A or B);

d ) nominal internal d iameter;

e) quarter and y ear of man facture;

f) des ription “ Air brake”;

g ) b tch reference n mber

Exa mple:

MR / BSAU1 0 / A/16/ 3Q9 / AIR BRAKE/BBB

1)

1b r=1 0kPa

2)

Marking BS AU1 0 :1 9 on or in relaton to a prod ct re resents a man facturer’s declaraton ofconformiy,i.e.a claim b

or on b halfof the man facturer that the prod ct me ts the re uirements of the stan ard.The acuracy f the claim is solely the

claimant’s resp nsibiliy S ch a declaraton is not to b confused wih third p rty certficaton of conformiy , which ma also b

desira le

Annex A (norma tive)

Ag eing test

A.1 Air oven ( se BS9 3-A19)

The internal dimensions of the air ov en shal not

exce d ( 1× 1× 1.5)m No cop er or cop er aloy

shal be within the ag eing chamber.Prov ision shal

be mad e for suspend ing test pieces so that they are

not within1 cm of each other or of the sid es of the

ov en

There shal be a slow cir ulation of air throug h the

ov en of not les than thre chang es in one hour The

incoming air shal be heated to the temperature of

the ov en before coming into contact with the test

pieces

Means shal be prov id ed for control ing and

measuring the rate of air flow

The temperature of the ov en shal be

thermostatical y control ed so that the test pieces

are kept within1 °C of the relev ant ag eing

temperature specified inA.2 A thermometer shal

be placed among st the test pieces to indicate the

actual ag eing temperature

A.2 Proc dure

Bend a leng th of hose arou d a former of the

d imensions specified in Ta le A.1 and hold in place

b a b nd or cord ( se Fig ure A.1)

Place the as embly in the ov en at the a propriate

temperature shown below for a period of ( 70±2)h:

ty pe A1 5°C

ty pe B15 °C

After the ag eing period take the as embly f om the

ov en, alow it to co l to ro m temperature an

remov e the hose fom the former Open out the hose

to a straig ht leng th and cut leng thwise for

ex mination

Annex B (normative)

Lea kag e under pres ure

Connect the hose as embly , ca ped at one end, to a

sour e of air pres ure S bmerg e the as embly in

water, using any suita le container for the water

such that v isual observ ation of the as embly is

pos ible

Apply an internal air pres ure of15.5b r to the

hose, maintaining the air pres ure for at

least5min Ex mine v isualy for leaks

Ta le A.1 — Dim ensions of hose test pie es and form er

Dimensions in milimetres

Nom inal inte nal diam ete of

hose

Leng th of hose Ra ius

R

Heig ht

A

Width

B

T ick es

C

6.3

10.0

1 5

14.0

16.0

2 9

25

27

3 5

3 5

3

4

51

5

5

1 4

1 0

1 7

14

14

7

8

102

1 4

1 4

13

19

19

2

2

Fig ure A.1 — Hose positioning for ag eing test

Annex C (normative)

Flexure test

C.1 Preparation of test pie es

C.1.1 Prior to cut ing the hose, a ply a lay line ( of a

colour disting uisha le f om that of the hose cov er)

along the leng th of the hose folowing the natural

hose curv ature which results f om the hose being

coied in a rol ( se Fig ure C.1)

C.1.2 Cut the hose to prov ide a hose as embly test

piece with a f e hose leng th as shown in Ta le C.1

Fre hose leng th is the outsid e ex osed hose leng th

betwe n the fit ing s in the finished hose as embly

C.1.3 Assemble fit ing s to the hose in ac ord nce

with the man facturer’s instructions

C.2 Pre onditioning

Subject each hose test piece as embly to the neutral

salt spra test d es ribed in8.10 folowed b heat

ag eing in an ov en at ( 10 ±1)°C for ( 70±2)h with

the hose as embly in a straig ht position

C.3 Instalation of test pie es in the test set up

After precond itioning , instal the as embly as

shown in Fig ure C.2 and proce d as fol ows, using

config uration dimensions g iv en in Ta le C.1

a) W ith the mov able manifold, Y, of the flex test

machine at the centre of its stroke, con ect fit ing

to the mov able manifold in such a manner that

the lay line is located at the top-centre position

( se Fig ure C.2)

b) After fit ing has be n coupled with the mov able

manifold, connect the fit ing to the stationary

manifold, X , without imp rting any twist to the

hose, but alowing the hose to se k its natural

curv ature

C.4 Test proc dure

Flexure/pres ure cy clng test p rameter shal be as

fol ows:

a) total flexure stroke ( 152 ±1.6)mm;

b) flexure stroke f eq uency ( 10 ±5) cy cles/min;

c) ambient temperature in the rang e2 °C

to27°C;

d) internal air pres ure on test

samples( 10.3±0.1) b r

Flex the test pieces b mov ing fit ing f om the

centre stroke position to7 mm either side of centre

( “ A” d imension in Fig ure C.2) alternating betwe n

positions“1” and“2” whi e simultane usly cy clng

the air pres ure on for6 s an of for6 s

The air pres ure shal be alternately fuly “ on”

for( 60±5)s and ful y “ of” for( 60±5)s

C.5 Fai ure point

The faiure point shal be d etermined b los of air

pres ure throug h the fai ed test piece As the air

pres ure is alternately fuly “ on” for6 s and ful y

of for6 s, pres ure los shal be further des ribed

as fai ure of the sy stem to be repres uriz d

to( 10.3±0.7) b r throug h a diameter

orifice within1 0s

1.6

0.0 +0.0

mm

Fig ure C.1 — Curved hose

Ta le C.1 — Dim ensions for flexure test

Fig ure C.2 — Flexure test

Dimensions in milimetres

Nom inal inte nal

diam ete

Fr e hose leng th

± ( 1.6mm)

Config uration/dim ensions

a

a

1 5

14.0

16.0

a

This is an a pro imate a erag e radius

List ofreferences ( se claus 2)

Norm a tive ref rences

BSI publ cations

B ITISH STANDARDS INSTITUTIO , Lon on

BS9 3, Physica l te tng o r ub er

BS9 3-A16:19 7, Deter mina tion o the efe t o lquid s

BS9 3-A19:19 6, Hea t r esista nc a nd a cc ler a ted a geing te ts

BS3 5 :19 0, Glos a r y o r ub er ter ms

BS517 , Method s o te t f r r ub er a nd pla stc hos s a nd hos a ss mble

BS517 -101, Deter mina tion o d imensions

BS517 -101.2:19 7, Mea sur ement o length o hos s a nd hos a ss mble

BS517 -102, Hyd r a ulc pr es ur e te ts

BS517 -102.1:19 1, Hyd r osta tic te ts

BS7 7 :19 1, Method fr sa lt spr a y cor r osion te ts in a r tificia l a tmospher es

BS EN24 71:19 3, R ub er a nd pla st c hos a nd hos a ss mble — Method s o mea sur ement o

d imensions

BS EN24 72:19 3, R ub er a nd pla st c hos s — Sub-a mbient temper a tur e flexibii y te ts

BS EN27 26:19 3, R ub er a nd pla st c hos s — A ss s ment o ozone r esista nc und er sta tic cond it ons

BS EN28 3 :19 3, R ub er a nd pla st c hos — D eter mina tion o a d he ion betwe n components

Informative r f r nces

Other publ cations

[ 1]SAE J14 2, A utoma tic a ir br a ke hos a nd hos a ss mble

3)

3)

3 9 Chiswick Hig h Roa

London

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