Name: ISO 19349:2019 — Plain bearings with liquid lubrication — Lubricant supply arrangements and monitoring
SKU: ISO 19349:2019
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Overview

ISO 19349:2019 sets out international requirements and guidance for lubricant supply arrangements and monitoring in liquid-lubricated plain bearings. This standard primarily addresses hydrodynamic plain bearings used in large-scale rotating machinery across power generation, industrial manufacturing, and transportation sectors. The document aids engineers and designers in creating effective oil-based lubrication systems that ensure reliability, efficiency, and longevity of plain bearing assemblies as specified in ISO 11687.

The standard emphasizes practical design criteria for lubricant supply systems, including self-contained and forced lubrication methods, hydrostatic lubrication techniques, and critical monitoring systems. While it focuses on essential supply and monitoring requirements, full system design should also consult complementary standards such as ISO 10438-1, ISO 10438-2, and ISO 10438-3.

Key Topics

Lubrication Arrangements
- Self-contained bearings use internal oil reservoirs with shaft-driven supply, eliminating need for external energy.
- Circulated (Forced) lubrication involves a closed-loop system with pumping, filtering, cooling, and control units to ensure continuous oil flow and quality.
- Hydrostatic lubrication employs high-pressure oil supply for shaft lift, reducing wear during start-up, shutdown, and low-speed operation.
Oil Supply and Return Design
- Flexible connections in oil lines reduce vibrations and thermal stresses.
- Flow velocity should generally not exceed 2 m/s to avoid pressure losses.
- Return lines must have appropriate slopes (minimum 5%) and avoid sharp bends to prevent foaming and ensure efficient drainage.
- Oil reservoirs require adequate capacity, venting, and internal baffles to separate entrained air and contaminants.
Lubricant Selection and Cleanliness
- Suitable lubricants include mineral oils and compatible synthetic variants, with viscosity grades typically between ISO VG 15 and ISO VG 150.
- Cleanliness is critical; solid particle contamination should not exceed ISO 4406 classification 17/15/12.
- Filtration systems must include monitoring to detect blockages and ensure uninterrupted lubrication, with duplex filters recommended for non-stop operations.
Lubricant Heating
- Heating capacity limited to 1.5 W/cm² heating surface to prevent oil degradation and local overheating.
- Heating controls and safety mechanisms should be designed or consulted with the bearing or oil system manufacturer.
Monitoring Systems
- Design and operational monitoring must ensure real-time tracking of lubricant flow, temperature, cleanliness, and pressure to facilitate maintenance and prevent failure.

Applications

ISO 19349:2019 is essential for engineers, maintenance professionals, and system designers working on lubrication of large rotating machinery, including:

Power Generation Equipment: Turbines, generators, and auxiliary machinery requiring reliable hydrodynamic plain bearing lubrication.
Industrial Machinery: Heavy-duty motors, compressors, pumps, and mixers with high operational demand.
Transportation Systems: Rail locomotive components and large marine engines where bearing integrity is critical.

Implementing this standard supports improved machinery uptime, decreased maintenance costs, optimized lubricant life, and enhanced safety through effective monitoring and supply design.

Related Standards

To design comprehensive lubrication systems for plain bearings, ISO 19349:2019 should be used in conjunction with:

ISO 11687 (all parts): Plain bearing assemblies specifications.
ISO 10438-1, ISO 10438-2, ISO 10438-3: Detailed guidance on low and high-pressure lubrication systems and components.
ISO 4406: Cleanliness codes for hydraulic fluids and lubricants.
ISO 6743-99: Classification of lubricants suitable for plain bearings.
ISO 8068: Specifications for lubricant performance including moisture control.

Utilizing this network of standards ensures a robust approach to plain bearing lubrication, meeting international quality and safety benchmarks.

Keywords: ISO 19349:2019, plain bearings, liquid lubrication, lubricant supply, lubrication monitoring, hydrodynamic bearings, oil-based lubrication systems, forced lubrication, hydrostatic lubrication, lubricant cleanliness, bearing lubrication standards, oil reservoir design, lubrication system design, large-scale rotating machinery.

ISO 19349:2019 PDF

Похожие стандарты

Abstract

Overview

Key Topics

Applications

Related Standards

Технические детали

BS ISO 11687-2:2020

Plain bearings. Pedestal plain bearings. Side flange bearings.

BS EN ISO 10438-1:2007

Petroleum, petrochemical and natural gas industries. Lubrication, shaft-sealing and control-oil systems and a…

SIST EN ISO 10438-2:2008

Petroleum, petrochemical and natural gas industries - Lubrication, shaft-sealing and control-oil systems and…

SIST EN ISO 10438-3:2008

Petroleum, petrochemical and natural gas industries - Lubrication, shaft-sealing and control-oil systems and…

BS ISO 4406:2021

Hydraulic fluid power. Fluids. Method for coding the level of contamination by solid particles.

SIST ISO 6743-99:2003

Lubricants, industrial oils and related products (class L) -- Classification -- Part 99: General

SIST ISO 8068:2024

Lubricants, industrial oils and related products (class L) - Family T (Turbines) - Specifications for lubrica…