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IS 12119 : 1987General requirements for pan mixers for concrete

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ISO 18650-1 · BS EN 12151 · ISO 18650-2
CurrentFrequently UsedSpecificationBIMMaterials Science · Cement, Concrete, Aggregates and RCC
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OverviewValues5InternationalTablesFAQ4Related

IS 12119:1987 is the Indian Standard (BIS) for general requirements for pan mixers for concrete. This standard specifies the requirements for the materials, construction, performance, and testing of batch-type pan concrete mixers. It covers various nominal capacities and outlines the criteria for ensuring uniform mixing, such as through a performance test measuring the variation of coarse aggregate.

General requirements for pan mixers for concrete

Overview

Status
Current
Usage level
Frequently Used
Domain
Materials Science — Cement, Concrete, Aggregates and RCC
Type
Specification
International equivalents
ISO 18650-1:2018 · ISO - International Organization for StandardizationBS EN 12151:2007 · BSI - British Standards Institution, UK (European Standard)ISO 18650-2:2018 · ISO - International Organization for Standardization
Typically used with
IS 2062IS 325IS 516IS 1791
Also on InfraLens for IS 12119
5Key values1Tables4FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes
! Pan mixers provide a more intensive shearing action than drum mixers, making them ideal for stiff, low-slump mixes common in precast concrete production and for producing high-strength concrete.
! Regular inspection and timely replacement of wear plates and mixing blades are critical to maintain the mixing efficiency specified by the performance requirements in Clause 8.
! The performance 'washout test' (Clause 8.2) is the definitive method to certify a mixer's capability but is complex; end-users often rely on manufacturer's type-test certification.
Frequently referenced clauses
Cl. 3CapacitiesCl. 4General ConstructionCl. 6Power Unit and TransmissionCl. 8Performance RequirementsCl. 9Marking
Pulled from IS 12119:1987. Browse the full clause & table index below in Tables & Referenced Sections.
concretecementaggregatessteel

International Equivalents

Similar International Standards
ISO 18650-1:2018ISO - International Organization for Standardization
HighCurrent
Building construction machinery and equipment — Concrete mixers — Part 1: Vocabulary and general specifications
Covers general specifications and terminology for various concrete mixers, including pan-type.
BS EN 12151:2007BSI - British Standards Institution, UK (European Standard)
MediumCurrent
Machinery and plants for the preparation of concrete and mortar - Safety requirements
Focuses on safety requirements for all concrete mixers, not performance or general construction.
ISO 18650-2:2018ISO - International Organization for Standardization
HighCurrent
Building construction machinery and equipment — Concrete mixers — Part 2: Procedure for examination of mixing efficiency
Directly corresponds to the performance testing section of IS 12119.
BS 1305:1974BSI - British Standards Institution, UK
LowWithdrawn
Specification for batch type concrete mixers
Historical predecessor covering batch mixers in general, including pan types, but now outdated.
Key Differences
≠IS 12119 has very basic safety clauses (e.g., 'provide suitable guards'), whereas EN 12151 provides extensive, legally-mandated safety requirements based on risk assessment, including interlocked guards, emergency stops, and control system integrity.
≠IS 12119 is specific only to pan mixers. In contrast, ISO 18650-1 provides a comprehensive classification system for multiple mixer types, such as pan, tilting drum, non-tilting drum, and continuous mixers.
≠Modern standards like ISO 18650-1 and EN 12151 mandate detailed documentation, including a comprehensive instruction handbook, declaration of conformity, and information on noise and vibration levels, which are not required by IS 12119:1987.
≠The mixing efficiency test in IS 12119 is based solely on the distribution of coarse aggregate, while ISO 18650-2 allows for testing the uniformity of various constituents like mortar, water content, or air content, providing a more flexible and thorough assessment.
Key Similarities
≈All standards share the fundamental objective of ensuring the mixer can produce a homogeneous and uniform batch of concrete, which is verified through a performance test.
≈Both IS 12119 and ISO 18650-1 define mixer capacity in two ways: one based on the volume of input dry materials (nominal capacity) and the other on the output volume of fresh mixed concrete (batch capacity).
≈The standards recognize and provide general requirements for the main structural and operational components, such as the mixing pan/drum, mixing tools (blades), power unit, and discharge mechanism.
≈A common requirement is the use of replaceable wearing plates/liners made of abrasion-resistant material inside the mixing pan to ensure durability and a reasonable service life.
Parameter Comparison
ParameterIS ValueInternationalSource
Mixing Efficiency CriteriaCoefficient of variation of coarse aggregate content in mortar samples must not exceed 5%.Allows testing various constituents; coefficient of variation for coarse aggregate content should not exceed 10%.ISO 18650-2:2018
Water Dosing Accuracy±2% of the indicated quantity, if a water meter is fitted.Accuracy of devices for weighing or measuring components shall be within ±3% of the target quantity.ISO 18650-1:2018
Mixer Lid/Cover SafetyRecommends a cover to prevent splashing and spillage; no specific safety interlock mentioned.Mandates an interlocking guard on the mixer opening that stops hazardous motion when opened.BS EN 12151:2007
Capacity DesignationDesignated by nominal input / mixed output capacity in litres (e.g., 500/335 P).Nominal capacity is defined as the volume of fresh mixed concrete (output); pan volume is specified separately.ISO 18650-1:2018
Discharge HeightSpecifies minimum discharge height (e.g., 1200 mm for mixers > 200 L) to allow discharge into a standard container.No specific discharge height is mandated; it is determined by the mixer's application and manufacturer's design.ISO 18650-1:2018
Mixing Blade SpeedThe peripheral speed of the outermost mixing blades shall be between 1.5 and 2.0 m/s.Does not specify a mandatory blade speed; this is left to the manufacturer's design to achieve the required mixing performance.ISO 18650-1:2018
⚠ Verify details from original standards before use

Key Values5

Quick Reference Values
Nominal capacities100, 200, 300, 500, 750, 1000, 1500, 2000, 2500, and 3000 litres
Performance test CV limitCoefficient of Variation of coarse aggregate content shall not be more than 5%
Starting overload capacityCapable of starting with 15% overload on nominal capacity
Performance test mixing time90 seconds (Clause 8.2.3)
Blade and arm tip speedShall be between 1.25 and 2.0 m/s

Tables & Referenced Sections

Key Tables
Table 1 - Nominal Capacities of Pan Mixers
Key Clauses
Clause 3 - Capacities
Clause 4 - General Construction
Clause 6 - Power Unit and Transmission
Clause 8 - Performance Requirements
Clause 9 - Marking

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Cross-Referenced Codes
IS 2062:2011Hot Rolled Medium and High Tensile Structural...
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IS 325:1996Three Phase Induction Motors
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IS 516:2021Methods of Tests for Strength of Concrete - P...
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IS 1791:1968Batch Type Concrete Mixers - Specification
→

Frequently Asked Questions4

What are the standard capacities for pan mixers as per IS 12119?+
The standard nominal capacities are 100, 200, 300, 500, 750, 1000, 1500, 2000, 2500, and 3000 litres (Table 1).
What is the main performance criterion for a pan mixer?+
The coefficient of variation of the coarse aggregate content between different samples from a batch shall not exceed 5% (Clause 8.2.4).
What overload must the mixer be able to handle on start-up?+
The mixer must be capable of starting with a 15 percent overload by weight of its nominal rated capacity (Clause 6.1).
What information should be marked on the mixer?+
The mixer should be marked with the Manufacturer's name, mixer type (pan), model/serial number, nominal capacity, and recommended mixing speed (Clause 9.1).

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