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IS 10090:1982 is the Indian Standard (BIS) for numerical. This standard specifies the requirements for materials, dimensions, manufacture, and finish for numericals (numbers 0 to 9) used for building identification purposes. It covers numerals made from various materials including cast and wrought alloys of aluminium and brass, as well as stainless steel and plastics.
! When specifying, clearly state the material (e.g., SS 304, cast brass) and size required, as the standard provides multiple options.
! This standard covers screw-fixed numerals. For adhesive-backed types, rely on manufacturer specifications and test for suitability on the intended surface.
! The finish (e.g., polished, satin, anodized) should be selected based on architectural requirements and environmental exposure to prevent degradation.
EN 16129:2013CEN (European Committee for Standardization), Europe
HighCurrent
LPG equipment and accessories - Pressure regulators, automatic change-over devices, having a maximum regulated pressure of 4 bar, with a maximum capacity of 150 kg/h, associated safety devices and adaptors for butane, propane and their mixtures
Directly covers performance, safety, and testing of LPG pressure regulators for similar domestic and commercial applications.
UL 144, 12th Ed.UL (Underwriters Laboratories), USA
HighCurrent
Standard for LP-Gas Regulators
Specifies construction, performance, and testing requirements for LP-Gas regulators in the North American market.
AS 4267:1995Standards Australia, Australia
HighCurrent
Pressure regulators for use with liquefied petroleum gas (LP Gas)
Covers design, construction, and performance requirements for LPG pressure regulators in Australia.
BS 3016:1989BSI (British Standards Institution), UK
MediumWithdrawn
Specification for pressure regulators for use with butane/propane gases
A historical UK equivalent covering similar types of LPG regulators before harmonization with EN standards.
Key Differences
≠IS 10090:1982 has less stringent requirements for non-metallic components (diaphragms, seals) compared to modern standards like EN 16129, which mandate extensive aging, low-temperature flexibility (-20°C or lower), and chemical resistance tests.
≠Modern international standards such as EN 16129 and UL 144 often mandate or have specific clauses for advanced safety devices like Over-Pressure Shut-Off (OPSO) and Under-Pressure Shut-Off (UPSO), which are not a primary focus of the 1982 Indian standard.
≠The corrosion resistance requirements in IS 10090 are general, whereas EN 16129 specifies a standardized neutral salt spray test (e.g., 240 hours per ISO 9227) to verify performance.
≠IS 10090 was reaffirmed in 2002 but is fundamentally a 1982 standard. International standards have undergone significant updates to reflect changes in materials science, manufacturing technology, and safety concepts.
Key Similarities
≈All standards share the fundamental purpose of ensuring a device safely reduces high-pressure LPG to a stable, low working pressure for appliance use.
≈The core operational principle of a spring-loaded diaphragm mechanism to regulate pressure is common across all standards.
≈All standards mandate the inclusion of an integrated pressure relief valve (PRV) to safely vent excess downstream pressure in case of regulator failure.
≈Key performance tests such as external and internal leak tightness, lock-up pressure, and outlet pressure stability under varying flow rates are fundamental requirements in IS 10090 and its international counterparts.
Parameter Comparison
Parameter
IS Value
International
Source
Lock-up Pressure (at zero flow)
Shall not exceed 125% of nominal outlet pressure
Shall not exceed 130% of the maximum declared outlet pressure (e.g., <39 mbar for a 30 mbar regulator)
EN 16129:2013
Pressure Relief Valve (PRV) Opening Pressure
Between 150% and 200% of the nominal outlet pressure
Specified as a concrete range, e.g., for a 30 mbar regulator, it must open between 60 mbar and 150 mbar
EN 16129:2013
Endurance Test (Mechanical)
10,000 cycles of operation
15,000 cycles for the regulating mechanism
EN 16129:2013
Low Temperature Resistance (Functional Test)
Not explicitly specified in detail; testing at ambient temperature.
Must remain functional and pass leak tests after conditioning at -20°C for a specified period.
EN 16129:2013
Body Material
Zinc-base alloy (conforming to IS 713) or Brass Forging/Rod (conforming to IS 6912/IS 319)
Zinc alloys (conforming to EN 1774), copper alloys, or stainless steel with specific compositional and performance requirements.
EN 16129:2013
Diaphragm/Seal Material
Synthetic rubber suitable for LPG (conforming to IS 9798)
Elastomers (e.g., NBR, FKM) conforming to EN 549, with specific requirements for hardness, aging, and swelling in pentane.
EN 16129:2013
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Minimum specified height of numeral40 mm
Maximum specified height of numeral150 mm
Nominal thickness for cast brass numerals2.5 mm
Nominal thickness for wrought stainless steel numerals1.25 mm
Tolerance on height dimensions±1.0 mm
Recommended fixing screwNo. 4 slotted countersunk head wood screw as per IS 6760
What materials are specified for numerals in IS 10090?+
The standard covers cast aluminium alloy, wrought aluminium, cast brass, wrought brass, plastics (like polycarbonate), and stainless steel (Clause 4).
What are the standard sizes for numerals according to this code?+
The code specifies heights of 40, 50, 60, 75, 100, 125, and 150 mm, with corresponding widths and thicknesses detailed in Table 1.
What kind of finish is required for these numerals?+
Numerals must be free from casting, moulding or fabrication defects, with smooth surfaces and edges. Specific finishes like polishing, anodizing or satin finish depend on the material used (Clause 6).
Does the standard specify how to fix the numerals?+
Yes, it specifies the provision of at least two countersunk holes for fixing with wood screws (Clause 6.1.4). The recommended screw is No. 4 as per IS 6760.