1 
                                                  g]=u'0f ५४२:२०७४ (२०७४/०९/२८)  
 
                                                                                   NS: 542 : 2074  (2074/09/28)  
                                                                                
                                                                                                                                               
                                            
 
 
 
 
    
 
    g]kfn u'0f:t/                                                                                    
NEPAL STANDARD  
   
Nepal Standard  
RUBBER HOSE FOR LIQUEFIED PETROLEUM GAS (LPG) — SPECIFICATION  
 
 
 
 
 
 
 g]kfn ;/sf/                                                                                                                        
pBf]u dGqfno                                                                                
g]kfn u'0f:t/ tyf gfktf}n ljefu  
फाराजु , काठभाडौ 
 
 
 
 
 
 
2 
                                                             NBSM  
sf7df08f}, g]kfn .  
g]kfn u'0f:t/ kl/ifb \ 
Nepal Council for Standardization (NCS)  
ने.गुण.५४२-२०७४  
RUBBER HOSE FOR LIQUEFIED PETROLEUM GAS (LPG) — SPECIFICATION  
अध्यऺ  
भानननम  सुननर फहादुय थाऩा, उधोग भन्त्री  
उपाध्यऺ 
  श्री माभ कुभायी खनिवडा , सनिव , उधोग भन्त्रारम  
सदस्यहरु 
l;=g+=       gfd                                             ऩद                             ;+:yf 
१.      श्री रयषषयाज कोईयारा        सह-सनिव              उधोग भन्त्रारम  
२.     .................. .......               सह -सनिव              वाणणज्म भन्त्रारम  
३.   श्री सुयेन्त्र ऩसाद सुवेदी           सह-सनिव              षवज्ञान िथा प्रषवनध भन्त्रारम  
४.   श्री संजीव कुभाय कणण                            सह-सनिव              खाध प्रषवनध िथा गुणननमन्त्रण षव.  
५.   ..................................                    सह-सनिव              बौनिक ऩुवाणधाय िथा मािामाि भन्त्रारम  
६.   श्री डडल्रीयाज नघनभये          सह-सनिव              कानुन िथा संसदीम व्मवस्था  भन्त्रारम  
७.  श्री सुभनरार श्रेष्ठ                 सह -प्राध्माऩक            षरबुवन षवश्वषवधारम    
८.  श्री प्रा.डा. डदऩक प्रसाद सुवेदी         प्राध्माऩक            काठभांडौ षवश्वषवधारम      
९.  श्री ज्ञानेन्त्ररार प्रधान                                      नेऩार उधोग वाणणज्म भहासंघ         
१०. श्री डदऩक श्रेष्ठ                                                    नेऩार िेम्वय अप कभसण  
११. .....................                                  उऩबोक्ता सयोकायवारा संघ संस्था  
१२. श्री नसजणना फुराणकोटी                               उऩबोक्ता सयोकायवारा संघ संस्था  
१३.श्री अरुणदेव                                                            षवज्ञ  
 
 
 
सदस्म सनिव  
श्री षवश्ववाफु ऩुडासैनी , भहाननदेशक ,ने.गु.िथा ना.िौ.षव.  
 
 
                                           
 
 
 
 
 
 
 
 
 3 
                                                 प्राविधिक सधिधिको बैठकका पदाधिकारी हरु (२०७३/१०/११) 
 
         ने.गुण.५४२-२०७४                 
                                          RUBBER HOSE FOR LIQUEFIED PETROLEUM GAS (LPG) — SPECIFICATION  
  
                      श्री षवश्ववाफु ऩुडासैनी , भहाननदेशक , नेऩार गुणस्िय िथा नाऩिौर षवबाग  
                      श्री योभी भान्त्नधय , उऩ-भहाननदेशक , नेऩार गुणस्िय िथा नाऩिौर षवबाग  
                      श्री दीनानाथ नभश्र , उऩ-भहाननदेशक , नेऩार गुणस्िय िथा नाऩिौर षवबाग  
                      श्री प्रभोदा प्रधान ,उऩ-भहाननदेशक , नेऩार गुणस्िय िथा नाऩिौर षवबाग  
                      श्री होभनाथ ऩोखयेर,नेऩार ईणन्त्ज. एशोनशएशन  
                      श्री गणेश प्र. ऩाठक , नेऩार गुणस्िय िथा नाऩिौर षवबाग  
                      श्री भणणयाभ बुसार,  नेऩार गुणस्िय िथा नाऩिौर षवबाग  
                      श्री आरोक कुभाय नभश्र,  नेऩार गुणस्िय िथा नाऩिौर षवबाग  
                      श्री प्रभरार भहजणन,याषिम उऩबोक्ता  
                      श्री कुर प्रसाद दहार, गौयीशंकय ग्मास उधो ग प्रा.नर.  
                      श्री सुनशर कु. अग्रवार, ऩशुऩनि पल्टय क्माणन्त्डर उधोग  
                      श्री षवनोद काफ्रे,ग्मास षवक्रिा संघ नेऩार  
                      श्री भुकुरभणण दहार, नेऩार नसनरण्डसण प्रा.नर.  
                      श्री संणजव भहजण न,ऩुरिोक ई. क्माम्ऩस  
                      श्री नशव प्र.नघनभये,नेऩार एर.षऩ.ग्मास उधोग संघ  
                      श्री प्रबाि कु. नसंह,उधोग भन्त्रारम  
                      श्री ननयाजन अनधकायी, नसदाथण ग्मास  
                      श्री कृष्ण फहादुय सोडायी, नेऩार गुणस्िय िथा नाऩिौर षवबाग  
                             
 
                                       
 
 
 
 
 
 
 4 
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lgwf{/0f ug{ o; ljefunfO{ ePsf] lgb]{zg / gLlt cg';f/ /fli6«o :t/df u'0f:t/ k|n]v हरु | tof/ kfg]{ 
l;nl;nfdf cfjZos tl/sf / 9frfdf of] u'0f:t/ k|n]v th'{df u/L k|:t't ul/Psf] 5 . o;n] g]kfn 
u'0f:t/ ;+u ;DalGwt ;a} kIfsf lgldt cfj Zos lgb]{lzsfsf] sfo{ ug]{ 5 .  
 
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u/L b]xfosf] ljb]zL tyf cGt/fli6«o  ;+3 ;+:yfsf] k|n]v tyf cGo ;fwfgx? sf] ;xof]u lnOPsf] 5 .  
 -s_ cfO{=P;=cf]= — OG6/g]zgn cu{gfOh]zg km/ :6f088{8O{h]zg  
 -v_ lj=P;=cfO{= —  la|l6z :6 \of088{ O{lG:6Ro";g  
 -u_ lj=cfO{=P;= — Ao'/f] ckm O{lG8og :6f088{   
 
#= k|n]v tof/ kfbf{ vf; Wofgdf /flvPsf  a'+bfx?  
 
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xf]l;of/L /flvPsf] 5 . c;fjwfgLaf6 s]xL pn+3g x'g uPsf] 1ft x'g cfPdf o;df rflxg] ;+zf]wgsf] 
nflu oyflzw| sbd p7fO{g] 5 .  
 
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kl/R5]bsf]  pn+wg gx'g] u/L of] u'0f:t/ k|n]v tof/ kfg]{ sf]lz; ul/Psf] 5 . sy+sbflrt u'0f:t/ 
k|n]vsf] s'g} efudf pNn]lvt s'/f हरु| xfn k|rngdf ePsf tyf eljiodf cfpg] P]g lgod ;+u afl emg 
uPdf To:tf -k|n]v_ sf s'/f हरु | :jtM lg:s[o x'g]5 .  
 
#=#   gfktf}n O{sfO tyf ltgLx|sf] |kfGt/ ubf{ :6fG88{ gfktf}n P]g cGt/u{t h] hlt lgodx| 5g \ ;a}nfO{ 
oyf]lrt dfGotf lbO{ logLx|sf] k|of]u ul/Psf] 5   
 
#=$ o; k|n]vsf] th'{df g]=u'= tyf cfO{=P;=cfO{= /  To:t} cGo cGt/fli6«o ;+3 ;+:yfx? sf ;DalGwt 
laifodf lgb]{lzsf k':tLsf tyf u'0f:t/ lgwf{/0f / u'0f lgoGq0f ;DaGwL cGo   sfo{x?sf] k|ltj]bg 
O{Toflbaf6 ;fdflu|x? oyf;Dej k|fKt u/L ltgLx? sf] l;kml/; cg'?k  ;fdfGh:o Nofpg vf]lhPsf] 5 
. 
 
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ax'dfGo O{sfO{ tyf cfO{.o;.cf] n] ;d]t l;kml/; u/]sf] P;.cfO{ OsfO{ k|0ffnLnfO{ oyf;Dej k|of]udf 
NofPsf] 5 .  
 
 
 
 
 
 5 
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x6fpg / उत्ऩादकहरु / v/Lbstf{ हरु] cfjZostf हरु|nfO{ k"lt{ ug'{ o; klxnf] ;+zf]lwt k|n]vsf] 
cfjZostf x'g cfPsf] xf] . pTkfbsx?  / v/Lbstf{sf] ;'emfjx? lnO{ o; k|n]vnfO{ klxnf] ;+zf]wg 
ul/Psf] xf] .  
 
&= o; u'0f:t/ k|n]vdf  Rubber hose for liquefied petroleum gas (LPG) -Specification  laj/0f ;DalGw 
k|fljlws kIfnfO{ dfq ;dfa]z ul/Psf] 5 . sf/f]af/ ;DalGw s'/fx?  o; k|n]vsf] If]q leq kb}{gg \ .  
 
 
 
 6 
 Nepal  Standard  
RUBBER HOSE FOR LIQUEFIED PETROLEUM GAS (LPG) — SPECIFICATION 
1 SCOPE  
This standard prescribes the requirements and methods 
of sampling and test for rubber hose for liquefied 
petroleum gases (LPG) for a maximum ambient 
temperature of 65°C and a maximum working pressure 
of 2.5 MPa for Type I, and 1.0 MPa for Type II hoses.  
2 REFERENCES  
The foll owing standards contain provisions which 
through reference in this text, constitute provisions of 
this standard. At the time of publication, the editions 
indicated were valid. All standards are subject to 
revision and parties to agreement based on the stan dard 
are encouraged to investigate the possibility of 
applying the most recent editions of the standards 
indicated below.  
 
…………        
)  
 
 
 
 
 
 
 
 
 
 
 
3 TERMINOLOGY  
For the purpose of this standard, the definitions given 
in NS * shall apply.  
3.1 Liquefied Petroleum Gas (LPG)  
4 TYPES  
This standard prescribes two types of hoses:  
a)  Type I  — Hose for Industrial 
Applications like LPG Bottling Plant  
Wire or textile reinforced hose suitable for a 
maximum working pressure of 2.5 MPa. The 
coupled  hose assembly shall have the 
capability to conduct electrical charge from 
one coupling to another. If this capability in textile reinforced hose is provided by means 
of metallic wires, then not less than two 
(crossed) metallic bonding wires shall be 
incor porated in the hose. The metallic wire 
shall have resistance to corrosion, fatigue and 
work hardening  
b)  Type II  — Wire Reinforced Hose for 
Domestic/ Commercial Installation  
Hose for connecting the gas cylinder(s) with 
burner(s) for domestic and commerc ial 
installations suitable for a maximum working 
pressure of 1.0 MPa.  
5 REQUIREMENTS  
5.1 The hose shall consist of lining, reinforcement and 
cover.  
5.2 Material  
5.2.1 Lining  
An inner lining is manufactured out of synthetic 
rubber like acrylonitrile -butadiene rubber (NBR), 
blends of NBR -Polyvinyl chloride (NBR -PVC) or 
chloroprene rubber (CR) compound resistant to 
liquefied petroleum gas. It shall be reasonably smooth 
in bore, u niform in thickness and free from air blisters, 
porosity and splits.  
5.2.2 Reinforcement  
5.2.2.1  For Type I hose the reinforcing wire or cord 
shall have surface treatment for good bonding with 
lining and cover compounds.  
5.2.2.2 Type II shall have surface brass coated wire 
reinforcement applied in the form of braid between the 
lining and cover compounds.  
5.2.3 Cover  
The cover shall be manufactured out of synthetic 
rubber compound resistant to abrasion, weather and 
liquefied petr oleum gas. It may have cloth marked 
impression finish. The color of cover for Type I shall 
be black and for Type II shall be orange.  
 
5.3 Dimensions and Tolerances  
5.3.1 Bore Size  
The nominal bore size of the hose when measured 
according to method presc ribed in NS** …. shall be 
as given in Table 1.  
 
 
5.3.2 Thickness of Lining and Cover  
The thickness of the lining and cover of the hose, when measured according to the method prescribed in 
NS** …… shall be not less than 1.5 mm and 1.0 mm 
 
NS. No     Title  
NS**   Methods of sampling and test for  
rubber hoses  
…… . Methods of test for vulcanized 
rubber  
…… . Rubber and plastics hose    —
Determination of adhesion 
between components  
…… . Liquefied petroleum gases — 
Specification  Glossary of terms 
used in rubber industry  
NS*  Definitions of basic terms  
……..   Definitions of additives  
…… .. Definition relating to properties 
and testing  
……..   Definition relating to processing  
…… .. Definition relating to products — 
Hoses    7 
 respectively for both Type I and Type II hoses.  
5.3.3 Length  
The length of the hose shall be as agreed to between 
the purchaser and the supplier. Tolerance on any hose 
length shall be ±1 percent. When hoses are supplied 
with end connection, th e length shall be the overall 
length including the end connections, subject to 
tolerance as agreed to between the purchaser and the 
manufacturer.  
 
5.4 Requirement of Physical Properties of Lining 
and Cover Compounds  
5.4.1 Tensile Strength and Elongation at Break of 
Lining and Cover Compound of Hose  
The tensile strength and elongation at break of the rubber compound used for lining and cover of the 
hose, when tested according to the method prescribed 
in NS**…   shall be as s pecified in Table 2. Tests shall 
be carried out on samples taken from sheet vulcanized 
to the same cured state as the production hoses.  
5.4.2 Accelerated Ageing Test  
After ageing in air for 72 h at a temperature of 100 ± 
1°C as prescribed in NS**  …., ten sile strength and 
elongation at break of lining and cover shall not 
decrease by more than 25 and 50 percent, respectively 
from the initial values.  
NOTE — there are no limitations on the increase in the values 
of these properties . 
 
Table 1 Dimension and Bend Radii for Rubber Hoses  
(Clauses 5.3.1 and 5.5.3)  
 
 
 
 
  
 
 
 
Table 2 Tensile Strength and Elongation at Break for Lining and Cover  
(Clause 5.4.1)  
Sl No.  Property  Lining  Cover  
i) Tensile strength, MPa 1), Min 10.0 10.0 
ii) Elongation at break, percent, Min 200 250 
1) 1 MPa = 10.2 kgf/cm2. 
 
 
 
 
 
 
 
 
   8 
 5.4.3 Resistance of Lining to n -pentane  
5.4.3.1  The n-pentane absorbed and the n-pentane 
extractable matter as determined by the method given 
in 5.4.3 2  shall not exceed 15 percent and 10 percent 
respectively of the initial mass of lining.  
5.4.3.2  Immerse a weighed portion of the lining of the 
hose in liquid n-pentane at room tempera ture for 72 h 
(M
0). The volume of n-pentane shall be at least 50 
times the volume of the test piece. Following 
immersion reweigh the test piece after 5 min 
conditioning in air at room temperature ( M
1) and re -
weigh again after 24 h further conditioning unde r the 
same condition ( M
2).  
Calculate the percentage n-pentane absorbed and the n-
pentane extractable matter as follows:  
a) Percentage n-pentane absorbed  
(M1-M2)×100  
M0                                             
b) Percentage n-pentane extractable matter  
(M0 – M2 )×100  
M0  
where  
M
0 =  initial mass of sample;  
M
1 =  mass of sample after immersion and 5 min 
conditioning; and  
M
2 =  mass of sample after 24 h further 
conditioning.  
5.5 Performance Requirements  
5.5.1 Adhesion  
When tested in accordance with NS*** the minimum 
adhesion between rubber lining and reinforcement, 
between layers of reinforcement and between 
reinforcement and cover shall be not less than  
1.5 kN/m for Type I, and 2 kN/m for Type II hoses.  
NOTE — 1kN/m = 2.50 kg/2.5 cm.  
5.5.2 Low Temperature Flexibility  
When a test piece cut from a length of hose is 
conditioned at – 40 ± 2°C for 5 h and then bent at 180º 
around a mandrel with a diameter 12 times the nominal 
bore diameter of the hose, no cr acks or breaks shall be 
shown.  
5.5.3 Flexibility of Hose  
When bent to the minimum bend radius given in Table 
1. Measured on the inside of the bend, the flatness shall 
not exceed 10 percent of the original outside diameter.  
Measure the hose outside diame ter with a caliper 
before bending the hose. Bend the hose to the minimum bend radius and measure the flatness with 
the caliper.  
5.5.4 Ozone Resistance  
The length of hose test piece for conducting the test 
shall be calculated by the formula as:  
 L = π ( r
b + d
ext) + 2 d
ext  
where  
L =  length of test piece;  
r
b =  bend radius of the hose as under test; 
and  
dext = outside diameter of the hose under test.  
 
Mount each test piece on a test piece holder as shown 
in Fig 1. The radius r
b shall be equal to the specified 
minimum bend radius for the hose under test or, if not 
specified, the bend radius of hose shall be six times the 
inside diameter of the hose under test. Seal the ends of 
the test pieces with caps to prevent absorption of 
ozone by the inner lining and reinforcement.  
The hose test piece mounted on the holder as 
mentioned above, when exposed in an ozone cabinet to 
an ozone concentration of 50 ± 5 pphm at 40 ± 2°C for 
72 ± 2h, shall show no sign of cracking when 
examined under 2X magnification, ignoring the area 
adjacent to the fixing points.  
5.5.5 Hydraulic Test Requirement  
5.5.5.1 Proof pressure test  
Each hose length or hose assembly complete with end 
connections when subjected to internal hydraulic 
pressure for 1 min, shall not show any rupture leakage 
or any other types of failure and the change in length 
shall be with in 12 percent of its original l ength when 
determined by the method prescribed in NS**  ….. The 
proof pressure shall be done at 5.0 MPa for Type I 
hose and at 2.0 MPa for Type II hose.  
5.5.5.2 Bursting pressure  
Representative sample of hose having 60 cm length 
including test fittings, c ut from a hose length 
approximately more than 100 cm long, when tested 
according to the method prescribed in NS**  …. shall 
not burst below an internal hydraulic pressure of  
10.0 MPa for Type I hose and 4.0 MPa for Type II 
hose.  
5.5.6 Electrical Continuit y Test  
The electrical continuity of wires in textile reinforced 
Type I hose after subjecting it to proof pressure test as 
per 5.5.5.1  shall be tested and maintained for each 
hose length from one end to another.  
 
  
 9 
 5.5.7 Grip Strength Test  
The Type II hoses when tested in accordance with test 
method given in Annex A, the hose shall comply with 
the requirements given below:  
a) The hose shall fit over the standard and 
over size metal nozzle shown in Fig. 2. 
b) It shall rem ain attached to both 
nozzles throughout the test period.  
5.5.8 Burning Behaviour  
5.5.8.1 When tested by the method given in 5.5.8.2  the 
hose shall not burn to either of the outer marks within 
45 s.  
5.5.8.2 Support horizontally a length of Type II hose o f 
minimum length 150 mm as shown in Fig. 3. Make 
three marks on the sample, the middle one 
approximately midway along the sample and the other 
two on either side, 50 mm from the middle mark. 
Direct a well aerated Bunsen flame (approximately 1 
800 kJ/h and about 25 mm in diameter) on the sample 
so that the flame is horizontal, in the plane of the 
sample and perpendicular to the axis of the sample, the 
central mark being in the middle of the flame. Apply 
the flame for 5 s and then remove it for 1 s. Repeat th e 
application of the flame until the material catches fire 
and continues to burn or until a total test period of 45 s 
has elapsed.  If the material catches fire and continues to burn 
without further application of the flame, note whether 
the flame catches  either of the outer marks within 45 s 
of the commencement of the test.  
6 PACKING AND MARKING  
6.1 Packing  
The hose shall be packed as agreed to between the 
purchaser and the supplier.  
6.2 Marking  
Each length of the hose shall be clearly and durably 
marked at intervals of not more than 0.5 m with the 
following information:  
a) Manufacturer’s name or trade -mark, if any;  
b) Words LPG Max W.P. 2.5 MPa for Type I,  
and LPG Max W.P. 1.0 MPa for Type II;   
c) Nominal bore;  
d) Batch/Lot No.;  
e) Month and year of manufacture; and  
f) Type of hose.  
6.2.1 NS Certification Marking  
Each length of the hose may also be marked with the 
Standard Mark.  
FIG. 1 A RRANGEMENT FOR  MOUNTING  HOSE (ozone Testing)  
10 
  
 
 
 
 
 
 
 
2A Nozzle for 7.90 mm Bore Type II Hose  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                          2B Nozzle for 7.90 mm Bore Tubing (Alternate)  
All dimensions in millimetres.  
NOTE — Tolerance on all dimensions: ± 0.25 mm.  
FIG. 2 S TANDARD  METAL NOZZLE FOR  7.9 mm B ORE TYPE II H OSE  
All dimensions in millimetres.  FIG. 3 T EST FOR  BURNING  BEHAVIOUR   
 
 
11 
  
6 SAMPLING AND CRITERIA FOR 
CONFORMITY  
For the purpose of ascertaining the conformity of the 
hose in a consignment to the specification, the scale of 
sampling and the criteria for conformity shall be as 
prescribed.  
7 TIME LAPSE BETWEEN RECEIPT OF 
MATERIAL AND TESTING  
7.1 For the test purposes , the minimum time between vulcanization and testing shall be 16 h.  
7.1.1 For product tests, whenever possible, the time 
between vulcanization and testing should not exceed 4 
months. In other cases, tests shall be made within 2 
months from the date of receipt of the product by the 
customer.  
ANNEX A  
(Clause 5.5.7)  
GRIP STRENGTH TEST  
 
A-1 PROCEDURE  
A-1.1 Four specimens of hose, each 150 mm long and 
clean of lubricant shall be tested.  
A-1.2 Force each test piece over a standard nozzle ( see 
Fig. 2) at one end and on oversize nozzle at the other 
(see Fig. 4).  
The oversize nozzle shall consist of cylindrical piece of 
metal of diameter corresponding to that shown in Fig. 4. 
Attach each standard nozzle to a hook and suspend the 
test pieces so that the axis of the tubing and nozzles ar e 
in the same vertical straight line. Attach a mass of 4.5 kg 
to the lower (oversize) nozzle and leave the assembly for 
30 min. reject  a test piece, if it slips off either nozzle 
during this period.  
 
 
 
 
 
NOTES  
1 For Type II, 8.0 mm bore hose, A = 10.00 mm .  
2 Tolerance on all dimensions: ±0.125 mm.  
  
A-1.3 Place the test assembly without mass not rejected, 
in an ageing oven and leave them for 72 h at 100°C. 
Then examine the test pieces for signs of splitting or 
cracks.  
A-1.4 Cool to room temperature and then test the 
assemblies for leaks at 0.70 Mpa air pressure under 
water for 5 min. There should not be air leakage.  
 
 
 
 FIG. 4 O VERSIZE  METAL NOZZLE  
All dimensions in millimeters