IEC 61518:2001 PDF

Mating dimensions between differential pressure (type) measuring instruments and flanged-on shut-off devices up to 413 BAR (41,3 MPa)

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Title (English):

IEC 61518:2001

Mating dimensions between differential pressure (type) measuring instruments and flanged-on shut-off devices up to 413 BAR (41,3 MPa)

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 13
Publication date:: January 24, 2001
Edition:: IEC IS 61518 edition 1 version 1
ICS:: 23.060.99

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Description (English):

Applicable to differential pressure (type) measuring instruments (instrument) with a shut-off device (manifold) directly bolted on to them.

Technical details

Technical committee: SC 65B - Measurement and control devices
SKU: IEC 61518:2001

Abstract

Overview

IEC 61518:2001 specifies the mating dimensions and related requirements for differential pressure (type) measuring instruments and flanged-on shut-off devices (manifolds) for service up to 41.3 MPa (413 bar) at 38 °C. It applies where a manifold is directly bolted to the instrument, defining flange geometry, seal types, bolt recommendations, assembly tolerances and marking to ensure leak-tight, interchangeable connections between devices from different manufacturers.

Key topics and technical requirements

Scope: Direct-bolted instrument–manifold assemblies; metallic flanges with yield strength ≥ 190 N/mm². Adapters or additional sealing elements are excluded.
Mating dimensions: Detailed flange and port dimensions in millimetres, including two recommended manifold facings:
- Type A: with extended spigot (insert)
- Type B: without extended spigot
Seals and gaskets:
- Flat rings specified (materials: PTFE and graphite) with dimensional tables for Type A and B interfaces.
- O-ring for Type A: ISO 3601-1 dimensions d1 = 20 mm, d2 = 2.65 mm; material FPM, IRHD 90 per ISO 48 and ISO 1629.
- No ISO-standard O-ring specified for Type B - user to select per local practice.
Fasteners and bolt details:
- Bolt materials and minimum requirements listed (e.g., ASTM A193 Group B8, ISO 898-1 Class 8.8, ASTM A449, ISO 3506).
- Thread engagement minimum 0.8 × thread diameter; guidance for bolt lengths for blind and through-threaded transmitters.
- Figures show common bolt thread examples (e.g., 7/16" UNF × 20).
Assembly and installation:
- Clean, undamaged surfaces within 28 mm of each port.
- Even bolt tightening; metallic flange gap after tightening

Related standards

Standards mentioned in the description

Overview

Key topics and technical requirements

Scope: Direct-bolted instrument–manifold assemblies; metallic flanges with yield strength ≥ 190 N/mm². Adapters or additional sealing elements are excluded.
Mating dimensions: Detailed flange and port dimensions in millimetres, including two recommended manifold facings:
- Type A: with extended spigot (insert)
- Type B: without extended spigot
Seals and gaskets:
- Flat rings specified (materials: PTFE and graphite) with dimensional tables for Type A and B interfaces.
- O-ring for Type A: ISO 3601-1 dimensions d1 = 20 mm, d2 = 2.65 mm; material FPM, IRHD 90 per ISO 48 and ISO 1629.
- No ISO-standard O-ring specified for Type B - user to select per local practice.
Fasteners and bolt details:
- Bolt materials and minimum requirements listed (e.g., ASTM A193 Group B8, ISO 898-1 Class 8.8, ASTM A449, ISO 3506).
- Thread engagement minimum 0.8 × thread diameter; guidance for bolt lengths for blind and through-threaded transmitters.
- Figures show common bolt thread examples (e.g., 7/16" UNF × 20).
Assembly and installation:
- Clean, undamaged surfaces within 28 mm of each port.
- Even bolt tightening; metallic flange gap after tightening

IEC 61518:2001 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

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