This document outlines the detailed specifications for washdown water closets crafted from vitreous china, emphasizing aspects such as design, sizing, performance criteria, and testing protocols to guarantee hygienic function and durability. It serves as a guideline for manufacturers, designers, and quality evaluators dealing with pedestal water closets featuring various trap types used in Indian residential and commercial sanitation infrastructure.
Overview
This document outlines the detailed specifications for washdown water closets crafted from vitreous china, emphasizing aspects such as design, sizing, performance criteria, and testing protocols to guarantee hygienic function and durability. It serves as a guideline for manufacturers, designers, and quality evaluators dealing with pedestal water closets featuring various trap types used in Indian residential and commercial sanitation infrastructure.
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Contents
Structure
This section defines the functional and interfacing dimensions for vitreous china washdown water closets incorporating various trap configurations, aiming to assure interchangeability and efficient performance. It applies to water closets featuring P-trap, S-trap, horizontal P-trap, and concealed S-trap designs. The dimensions specified include seat, outlet, inlet, water seal, and flushing connections. Testing mandates connection to flushing cisterns adhering to IS 774 or IS 7231 with a standard flushing pipe diameter of 40 mm and a maximum cistern height of 300 mm above the water closet.
This part lists the related Indian Standards incorporated by reference, including IS 774 for flushing cisterns, IS 2556 Part 1 for general vitreous sanitaryware requirements, IS 7231 for plastic flushing cisterns, and IS 9140 for sampling methods. It also highlights important adjustments such as substituting dimension D2 with D2/2 and ensuring the radius of free space from the outlet center is no less than 40 mm. Rounding of test results must follow IS 2:1960 guidelines maintaining specified significant figures.
This section references IS 2556 Part 1 for overarching requirements relating to terminology, material specifications, manufacturing processes, glazing, defect definitions, minimum thickness, tolerances, performance parameters, and testing methods. It emphasizes adherence to these generalized provisions for consistent quality and compliance.
Details are provided on four distinct water closet patterns: Pattern 1 with pedestal and independent cistern; Pattern 3 featuring horizontal outlet; Pattern 4 equipped with concealed S-trap. Functional dimensions such as height, water seal depth, width, seat bolt hole spacing, opening dimensions, overall length, and trap inlet depth are tabulated for each pattern, facilitating correct selection and installation.
This chapter summarizes critical functional and connection dimensions for all water closet patterns, presented in tabular format. Parameters include height, minimum water seal depth, seat bolt hole locations, trap inlet depth, outlet diameters, and radius of free space around outlets, ensuring proper fit and performance within plumbing systems.
It outlines design directives conforming to IS 2556 Part 1 for materials, glazing, thickness, and tolerances. The section also details dimensional specifications related to water seal, seat fitting, trap geometry, and overall size variations among different water closet patterns, ensuring structural integrity and operational efficiency.
Covers the placement and design of anti-siphonage vents on the trap outlet side, typically positioned at a 45-degree angle. The vent's invert must not lie below the outlet centerline. For horizontal outlet models, the vent is integrated within a specialized connector. Dimensions and installation details are specified to prevent trap seal loss due to siphoning.
Describes the testing protocols using low-level cisterns compliant with IS 774 or IS 7231. Tests include water seal depth verification, flushing efficiency with toilet paper and balls, splash testing, and sawdust flushing tests. Performance acceptance criteria, flushing pipe specifications, and installation heights are detailed to guarantee product functionality.
This section refers to IS 9140 for sampling and inspection methodologies applicable to vitreous sanitary appliances. It outlines flush splash tests where the number of droplets on the floor after flushing is counted, defining acceptance limits. Rounding rules per IS 2:1960 govern test data reporting to maintain consistency.
Details requirements for marking water closets with manufacturer’s name or trademark and batch identification. It explains the use of the BIS Standard Mark under the Bureau of Indian Standards Act, 1986, including licensing procedures. Contact information for BIS regional offices is provided for certification queries and compliance verification.
Frequently Asked
IS 2556 Part 2 defines functional and connecting dimensions for four primary washdown water closet patterns, including pedestal types with vertical, horizontal, and concealed S-trap outlets. The standard provides dimensional tables specifying height, water seal depth, seat bolt hole spacing, outlet diameters, and overall lengths, all measured in millimeters. Patterns 1 and 2 feature serrated, unglazed outlets; Pattern 3 has a glazed outlet without serration, while Pattern 4's outlet is unglazed. Anti-siphonage vents are mandatory for Pattern 3 in a specialized connector. Refer to Tables 1 and 2 and Figures 1 to 3 in the standard for exact measurements and tolerances.
To comply with IS 2556 Part 2, water closets undergo several performance evaluations. The toilet paper test requires flushing six loosely crumpled sheets of standard toilet paper four times, with at least three successful clearances. The ball test involves flushing fifty non-absorbent balls five times, with a minimum 85% discharge rate expected. The splash test observes water spray during five flushes, permitting up to ten isolated droplets without rejecting the unit. The sawdust test requires flushing twenty grams of fine dry sawdust, which must clear below 40 mm from the rim after one flush. These tests collectively assess discharge capability, splash control, and cleanliness.
The anti-siphonage vent is mandated where local sanitation authorities require it, primarily to prevent loss of the water seal in the trap due to siphoning. It must be positioned on the outlet side of the trap at a 45-degree angle (which can be right, left, or centered), with the vent hole invert not falling below the outlet centerline. For water closets with horizontal outlets (Pattern 3), the vent is incorporated into a specialized connector as specified in Clause 6.4.1. Proper vent placement ensures hygiene by maintaining the trap seal and preventing odors.
According to IS 2556 Part 2, water closets must sustain a load of 400 ± 5 kilograms (approximately 4 ± 0.05 kiloNewtons) applied for a duration of one hour. This load is imposed via a wooden beam measuring 100 mm by 100 mm placed centrally over the top opening of the closet. Post-test inspection should reveal no cracks, damage, or defects, confirming the fixture's structural durability under normal usage loads.
Manufacturers are required to imprint each water closet with a durable mark indicating the manufacturer’s name or trademark along with the batch or lot number. Additionally, products may bear the Bureau of Indian Standards (BIS) Standard Mark to signify compliance with Indian Standards, provided the manufacturer has obtained the appropriate licence under the BIS Act, 1986. Usage conditions for this mark are regulated by BIS, and manufacturers must consult regional BIS offices or official resources for licensing and certification procedures.
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