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IS 15320:2003 is the Indian Standard (BIS) for flexible connections for plumbing systems - specification. This standard specifies requirements for materials, dimensions, construction, and performance testing of flexible connections for plumbing. It covers braided hoses used to connect water supply lines to fixtures like taps, mixers, and WC cisterns in residential and commercial buildings.
Specifies requirements for flexible hose connections used in plumbing systems for sanitary appliances and taps.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Avoid twisting the hose or creating sharp bends during installation to prevent damage to the inner tube and restriction of flow.
! Ensure end fittings are tightened by hand first and then given a final quarter-turn with an appropriate wrench to avoid over-tightening and damaging the seal.
! Always check for the BIS Standard Mark (ISI mark) on the product and its packaging for quality assurance and compliance.
EN 13618:2016CEN (European Committee for Standardization), Europe
HighCurrent
Flexible hose assemblies in water installations - Specification and test methods
Covers specifications and testing for flexible hose assemblies for sanitary tapware.
ASME A112.18.6-2017/CSA B125.6-17ASME (American Society of Mechanical Engineers) / CSA (Canadian Standards Association), USA/Canada
HighCurrent
Flexible Water Connectors
Defines requirements for flexible connectors connecting plumbing fixtures to the water supply.
AS/NZS 3499:2006Standards Australia / Standards New Zealand, Australia/New Zealand
HighCurrent
Flexible-plenum water connectors
Specifies requirements for flexible connectors for use between water supply and fixtures.
BS 6920-1:2014BSI (British Standards Institution), UK
MediumCurrent
Suitability of non-metallic materials and products for use in contact with water intended for human consumption with regard to their effect on the quality of the water. Specification
Specifies material requirements for water contact parts, a key component within IS 15320's scope.
Key Differences
≠IS 15320 specifies a nominal working pressure of 0.6 MPa (6 bar), which is lower than the 1.0 MPa (10 bar) required by EN 13618, reflecting different regional plumbing pressure norms.
≠The hydrostatic pressure test in IS 15320 (1.5 MPa for 10 min) is significantly less stringent than in ASME A112.18.6, which mandates a test at 3.45 MPa (500 psi) for 1 hour.
≠IS 15320 requires 2000 thermal shock cycles (20°C to 85°C), which is double the number of cycles (1000) required by EN 13618, though at a slightly lower maximum temperature (90°C).
≠International standards like ASME A112.18.6 are often more explicit in specifying minimum flow rate requirements, whereas IS 15320 focuses primarily on the structural and material integrity of the connector.
≠While IS 15320 requires materials to be non-toxic, it is less prescriptive than international standards which explicitly reference specific material safety standards like NSF/ANSI 61 (USA) or BS 6920 (UK).
Key Similarities
≈All standards mandate performance-based testing, including hydrostatic pressure, burst pressure, and thermal cycling to ensure durability and prevent leaks.
≈There is a common requirement across all standards for end fittings and metal braiding to be made from corrosion-resistant materials like stainless steel or chrome-plated brass.
≈All standards specify tests for the tensile strength of the connection between the hose and the end fittings to prevent pull-off failures under service conditions.
≈The core scope is identical: to provide a specification for factory-made flexible hose assemblies used to connect plumbing fixtures and appliances to the building's water supply.
Parameter Comparison
Parameter
IS Value
International
Source
Nominal Working Pressure
0.6 MPa (6 bar)
1.0 MPa (10 bar)
EN 13618:2016
Maximum Continuous Use Temperature
70 °C
Marked for 90 °C
AS/NZS 3499:2006
Hydrostatic Proof Pressure Test
1.5 MPa for 10 minutes
3.45 MPa (500 psi) for 1 hour
ASME A112.18.6
Minimum Burst Pressure
2.5 MPa (25 bar)
2.5 MPa (25 bar) for PN10 hose
EN 13618:2016
Thermal Shock Cycles
2000 cycles (20°C to 85°C)
1000 cycles (Ambient to 90°C)
EN 13618:2016
End Fitting Tensile Strength (DN8)
500 N
300 N
EN 13618:2016
Salt Spray Test Duration (Corrosion)
24 hours (for plated parts)
96 hours (for stainless steel braiding)
AS/NZS 3499:2006
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Nominal working pressure1.0 MPa (10 bar)
Maximum working temperature90 °C
Hydrostatic pressure test requirement1.5 MPa for 2 min without leakage