ISO 228-2:1987 PDF

Name: ISO 228-2:1987 — Pipe threads where pressure-tight joints are not made on the threads — Part 2: Verification by means of limit gauges
SKU: ISO 228-2:1987
Price: 25 EUR
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Pipe threads where pressure-tight joints are not made on the threads — Part 2: Verification by means of limit gauges

Название (английский):

ISO 228-2:1987

Pipe threads where pressure-tight joints are not made on the threads — Part 2: Verification by means of limit gauges

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 13
Дата публикации:: 20 августа 1987 г.
Издание:: ISO IS 228 edition 2 version 1
ICS:: 21.040.30

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Описание (английский):

This second edition cancals and replaces the first edition (1980). Specifies the verification of cylindrical threads, the dimensions and tolerances of which are given in ISO 228-1. Since this 55o profile has different elements to be verified, it is necessary to provide for several GO and several NOT GO gouges.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 228-2:1987 - "Pipe threads where pressure‑tight joints are not made on the threads - Part 2: Verification by means of limit gauges" specifies how to verify cylindrical pipe threads (the dimensions/tolerances of which are given in ISO 228-1) using limit gauges. This second edition (1987) cancels and replaces the 1980 edition. It addresses verification for the 55° thread profile and defines the required GO and NOT GO gauges, wear checks and inspection practices needed to confirm pitch diameter, major/minor diameters and profile form.

Key topics and technical requirements

Scope: Verification procedures for cylindrical pipe threads used where sealing is not made on the threads.

Gauge types:

Solid threaded GO ring gauge and NOT GO ring gauge (external threads).
Threaded GO plug and NOT GO plug (internal threads).
Wear check plugs to assess allowable gauge wear.
Multiple GO and NOT GO checks are required due to the 55° profile elements.

Functional checks:

GO gauges verify the maximum‑material limit (virtual pitch diameter) and form (including rounding at crest/root and flank length).
NOT GO gauges verify the minimum material limit of the pitch diameter.
Wear checks embody the pitch diameter at a prescribed wear limit and are used for periodic control.

Use/control rules:

Gauging is typically performed by hand without excessive force; entry depth limits (number of turns) are specified for pass/fail criteria.
Checks follow the Taylor principle for gauging virtual pitch diameter (as referenced to ISO 1502).

Tolerances and classes:

Numerical tolerance values and gauge dimensions are provided (separate tables for class A and class B threads and values dependent on pitch).
Pitch tolerance and other dimensional limits are specified for reliable inspection.

Applications and who uses it

Practical for manufacturers, quality inspectors and calibration labs that produce or inspect threaded pipe fittings and connectors where sealing is not made on threads (e.g., mechanical assemblies, conduits, instrumentation fittings).

Useful in industrial production, maintenance, metrology and acceptance testing for thread conformity.

Applies to suppliers and purchasers who require standardized gauge verification procedures for threaded components.

Related standards

ISO 228-1 - Designation, dimensions and tolerances for cylinderical pipe threads (reference normative dimensions).

ISO 1502 - General purpose metric screw threads - Gauging (Taylor principle).

ISO 1179 - Example industrial application for pipe connections to ISO 228.

Keywords: ISO 228-2, pipe threads, limit gauges, GO gauge, NOT GO gauge, threaded ring gauge, threaded plug gauge, wear check plug, pitch diameter, thread verification, ISO 228-1.

ISO 228-2:1987 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

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