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IS 13593:1992 is the Indian Standard (BIS) for upvc pipe fittings to be used with the upvc pipes in the suction and delivery lines of agricultural pumps. This standard specifies the requirements for unplasticized PVC (UPVC) fittings intended for use in the suction and delivery lines of agricultural pump sets. It covers material requirements, dimensions, performance tests (like reversion and opacity), and marking criteria for various fittings such as couplers, bends, and tees.
UPVC pipe fittings to be used with the UPVC pipes in the suction and delivery lines of agricultural pumps
! Ensure that the pressure class of the fittings matches the pressure class of the UPVC pipes being used.
! Proper jointing using solvent cement (as per IS 7834) is crucial for creating a durable, leak-proof system.
! These fittings are specifically designed for agricultural water lines and should not be used for potable water supply unless they also comply with IS 4985 requirements.
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
UPVCplasticfittings
International Equivalents
Similar International Standards
EN ISO 1452-3:2010CEN / ISO (European Committee for Standardization / International Organization for Standardization)
HighCurrent
Plastics piping systems for water supply and for buried and above-ground drainage and sewerage under pressure - Unplasticized poly(vinyl chloride) (PVC-U) - Part 3: Fittings
Covers PVC-U pressure fittings, but for general water supply, not specific to agricultural pumps.
ASTM D2466-19ASTM International (USA)
HighCurrent
Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40
Specifies PVC-U pressure fittings with a different pressure rating system (Schedule vs Class).
AS/NZS 1477.3:2006Standards Australia / Standards New Zealand
HighCurrent
PVC-U pipes and fittings for pressure applications - Part 3: PVC-U fittings
Regional equivalent for PVC-U pressure fittings for general applications.
BS 4346-1:1969BSI (British Standards Institution), UK
MediumWithdrawn
Joints and fittings for use with unplasticized PVC pressure pipes. Part 1. Injection moulded unplasticized PVC fittings for solvent welding
Historical equivalent for injection moulded PVC-U solvent weld fittings in the UK.
Key Differences
≠IS 13593 is highly specific to fittings for suction and delivery lines of agricultural pumps, whereas standards like ISO 1452 and ASTM D2466 are for general pressure water applications.
≠Pressure rating systems differ significantly. IS 13593 uses 'Classes' (e.g., Class 1 for 4 kgf/cm²), ISO/EN standards use 'PN' ratings (e.g., PN6 for 6 bar), and ASTM uses 'Schedules' (e.g., Sch 40) which define wall thickness.
≠Dimensional specifications and tolerances for sockets and spigots, while conceptually similar, follow different tables and may not be directly interchangeable between IS, ISO, and ASTM systems.
≠Marking requirements are country-specific. IS 13593 mandates the ISI Standard Mark, while others require their respective certification marks (e.g., CEN, ASTM).
Key Similarities
≈All standards specify the same base material: unplasticized poly(vinyl chloride), commonly referred to as UPVC or PVC-U.
≈The primary manufacturing method covered is injection moulding for creating the fittings.
≈The main joining method specified is solvent cement welding, ensuring a permanent, chemically fused joint.
≈Core performance tests are common, such as the Vicat Softening Temperature (VST) for thermal stability and opacity tests to prevent algae growth.
≈All standards include requirements for resistance to internal pressure (short-term and long-term hydrostatic tests) to ensure fittings can withstand operational pressures.
Parameter Comparison
Parameter
IS Value
International
Source
Vicat Softening Temperature
Minimum 79 °C
≥ 79 °C
EN ISO 1452-3:2010
Heat Reversion Test (at 150 °C)
Maximum 5%
≤ 5% (for injection-moulded fittings)
EN ISO 1452-3:2010
Opacity Test
No light shall be transmitted through the wall of the fitting.
The wall of the fitting shall be opaque and shall not transmit light.
EN ISO 1452-3:2010
Default Colour
Dark Grey
Typically grey or blue, must be uniform.
EN ISO 1452-3:2010
Pressure Rating System (Example)
Class 2 (6 kgf/cm²)
PN 6 (6 bar)
EN ISO 1452-3:2010
Impact Strength Test Condition
Falling weight test at 0 °C
Falling weight test at 0 °C (for nominal sizes ≥ DN 20)
EN ISO 1452-3:2010
Material Compound Reference
As per IS 10148 (PVC for rigid pipes)
PVC-U compound as per ISO 1452-1
EN ISO 1452-3:2010
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Vicat softening temperatureMinimum 79 °C
Opacity of fitting wallShall not transmit more than 0.2 percent of visible light
Reversion test temperature150 ± 2 °C
Maximum reversion percentage5 percent
Density of UPVC material1.40 to 1.46 g/cm³ at 27°C
Tables & Referenced Sections
Key Tables
Table 1 - Dimensions of Sockets for Solvent Cement Welding
Table 2 - Dimensions of Sockets for Elastomeric Sealing Rings
What are the main types of fittings covered by this standard?+
The standard covers couplers, reducers, tees, bends, end caps, and pump adaptors for both solvent cement and elastomeric ring joints (Clause 4).
What is the purpose of the opacity test?+
The fitting wall must not transmit more than 0.2% of visible light to prevent the growth of algae and microorganisms inside the pipeline (Clause 6.3).
How are the fittings designated or classified?+
Fittings are designated by the pressure class of the pipe they are intended to be used with, for example, a fitting for a Class 3, 6 kgf/cm² pipe (Clause 5).
What material is specified for the fittings?+
The fittings shall be made from virgin UPVC compound conforming to the designation IS 10124: Part 1 (Clause 3.1).