ISO 924:2024

Coal preparation plant - Principles and conventions for flowsheets

This document sets out principles and conventions for use in the preparation of basic process and equipment flowsheets for the design of a coal preparation plant.

Ateliers de préparation du charbon — Principes et conventions relatifs aux schémas de traitement

General Information

• Status: Published
• Publication Date: 29-Aug-2024
• ICS: 73.120 - Equipment for processing of minerals
• Technical Committee: ISO/TC 27/SC 1 - Coal preparation: Terminology and performance
• Drafting Committee: ISO/TC 27/SC 1 - Coal preparation: Terminology and performance
• Current Stage: 6060 - International Standard published
• Start Date: 30-Aug-2024
• Due Date: 11-Oct-2025
• Completion Date: 30-Aug-2024

Relations

• Revises: ISO 924:1989 - Coal preparation plant - Principles and conventions for flowsheets
• Effective Date: 28-Oct-2023

Overview

ISO 924:2024, titled Coal Preparation Plant – Principles and Conventions for Flowsheets, is an internationally recognized standard developed by ISO Technical Committee ISO/TC 27, covering coal and coke. This third edition, published in August 2024, provides essential principles and conventions for preparing basic process and equipment flowsheets in the design of coal preparation plants. It aims to standardize the representation of process steps and equipment involved in coal preparation, ensuring clarity, uniformity, and universal understanding across the industry.

Coal preparation plants involve multiple stages ranging from raw coal pretreatment to product storage and loading. The standard facilitates consistent illustration of these stages, helping designers, engineers, and stakeholders communicate design plans effectively and optimize plant performance.

Key Topics

• Scope and Purpose
  ISO 924:2024 defines uniform principles and graphical conventions for process and equipment flowsheets, vital in the design and planning phases of coal preparation plants.

• Types of Flowsheets
  The standard specifies two primary flowsheet types:

  • Process Flowsheets: Highlight overall process stages using rectangles to group operations such as feed pretreatment, cleaning, product treatment, and storage.
  • Equipment Flowsheets: Represent machinery and plant items using standardized symbols as per ISO 561, focusing on the physical equipment involved.

• Conventions for Flow Representation
  To ensure clarity and avoid misinterpretations:

  • Material flow lines must be horizontal or vertical, entering from the top or left and exiting at the bottom or right.
  • Raw coal is depicted at the top left of flowsheets to start the flow direction toward processed products.
  • Flowline junctions are marked by spots, while crossing lines without mixing remain unconnected or use loop cross-overs.
  • Product sizes follow a descending order vertically, with size ranges clearly indicated in millimeters.
  • Capacities and flow rates are shown with specific placement rules to differentiate design and mechanical limits.

• Grouping of Operations
  The process from raw coal entry to product disposition is organized under:

  • Pretreatment of feed coal
  • Cleaning
  • Subsequent product treatments (e.g., solid-liquid separation)
  • Storage and loading
  • Product characteristics and destination

• Standard Capacity Notation
  The nominal plant capacity appears in the title. Design capacities for processes and equipment are marked alongside flowlines to specify operational limits, aiding performance guarantees and project clarity.

Applications

• Design and Engineering
  Applying ISO 924:2024 ensures engineers create flowsheets that are clear, consistent, and globally understandable during coal preparation plant design. It aids in optimizing process flows, sizing equipment, and visualizing operational sequences.

• Project Communication
  Standardized flowsheets support seamless communication between stakeholders including plant owners, operators, contractors, and consulting engineers by using a common graphical language and terminology based on ISO 1213-1 and ISO 561.

• Operational Planning
  The flowsheets serve as a basis for process control design, capacity analysis, and expansion planning, accommodating future modifications or additional treatment stages indicated by characteristic lines.

• Training and Documentation
  Uniform flowsheet conventions provide educational clarity for training personnel and documenting plant processes, reducing misunderstandings and enhancing safety.

Related Standards

• ISO 561 – Coal Preparation Plant: Graphical Symbols
  Establishes the standardized symbols for equipment used within flowsheets, critical for the equipment flowsheet type defined in ISO 924:2024.

• ISO 1213-1 – Solid Mineral Fuels: Vocabulary – Terms Relating to Coal Preparation
  Provides precise terminology and definitions to maintain consistency and avoid ambiguity within documentation and flowsheets.

• ISO/IEC Directives, Part 1 & 2
  Guide the preparation, editorial rules, and maintenance of ISO standards ensuring harmonized and high-quality documentation.

Keywords

Coal preparation plant, coal processing flowsheet, process flowsheet, equipment flowsheet, coal plant design, flow diagram conventions, coal cleaning, ISO 924:2024, standardized flowsheets, coal preparation symbols, industrial coal processing, plant capacity notation, process engineering documentation.

Standards Content (Sample)

International
Standard
ISO 924
Third edition
Coal preparation plant — Principles
2024-08
and conventions for flowsheets
Ateliers de préparation du charbon — Principes et conventions
relatifs aux schémas de traitement
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Types of basic flowsheet . 1
5 Grouping of operations and products. 1
6 Conventions for use on flowsheets . 2

iii
Foreword
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This document was prepared by Technical Committee ISO/TC 27, Coal and Coke.
This third edition cancels and replaces the second edition (ISO 924:1989), of which it constitutes a minor
revision.
The main changes are as follows:
— changes to update other nominated standards in the text;
— minor changes to some units and ISO normal set up;
— the list of informative terms in Clause 3 were deleted.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
At various stages in the design of a complete plant, it is necessary to illustrate by flowsheets the process
steps covering the operations to which the raw coal will be subjected in the preparation plant. In order that
these may be more readily and universally understood, it is desirable that flowsheets should conform to a
standard pattern and that various conventions should be well understood and adopted.

v
International Standard ISO 924:2024(en)
Coal preparation plant — Principles and conventions for
flowsheets
1 Scope
This document sets out principles and conventions for use in the preparation of basic process and equipment
flowsheets for the design of a coal preparation plant.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 561, Coal preparation plant — Graphical symbols
ISO 1213-1, Solid mineral fuels — Vocabulary — Part 1:Terms relating to coal preparation
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1213-1 and the symbols in
ISO 561 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Types of basic flowsheet
In order to cover the various stages leading to the final design of a plant, two basic flowsheets are needed,
one based on the process and the ot
...