GOST 8.586.4-2005 PDF

Full title and description

GOST 8.586.4-2005 — State system for ensuring the uniformity of measurements. Measurement of liquids and gases flow rate and quantity by means of standard differential-pressure devices. Part 4: Venturi tubes — Technical requirements. This national (interstate) standard is an adaptation/modification of ISO 5167‑4:2003 and establishes technical, geometric and installation requirements for Venturi tubes used to determine flow rate and quantity in circular, full-flow pipelines.

Abstract

This standard specifies types and geometric profiles of Venturi tubes, material and manufacturing requirements, pressure‑tap arrangements, applicable beta ratios and Reynolds number ranges, values and limits for discharge and expansion coefficients, uncertainty assessment of those coefficients, installation requirements (straight‑run lengths, flow conditioners, mounting), and acceptance/inspection provisions. It implements ISO 5167‑4:2003 with national technical deviations and was introduced for use in the Russian Federation as a national/interstate standard effective 1 January 2007.

General information

• Status: Active / in force (introduced as a national/interstate standard of the Russian Federation).
• Publication date: Designation year 2005; introduced into force as national standard 1 January 2007 (order dated 31 October 2006).
• Publisher: Adopted and published under the authority of the Federal Agency on Technical Regulating and Metrology (Rosstandart) as an interstate (GOST) standard.
• ICS / categories: Metrology and measurement; classification code cited as 17.020 (OKS 17.020).
• Edition / version: GOST 8.586.4-2005 (text corresponds to ISO 5167‑4:2003 with national technical modifications).
• Number of pages: 25 pages.

Scope

GOST 8.586.4-2005 applies to Venturi tubes installed in fully filled circular cross‑section pipelines for measurement of the volumetric flow rate and quantity of liquids and gases. It defines acceptable Venturi tube types (cast with unmachined inlet cone, cast with machined inlet cone, welded inlet cone from plate), geometric profiles and tolerances, allowable beta ratios and Reynolds number ranges for each type, methods for determining discharge and expansion coefficients and their uncertainties, limits on surface finish and roughness, pressure tapping arrangements, and installation requirements including minimum straight‑run lengths and flow conditioning. The standard is intended to ensure measurement traceability and interoperability of flow measurements made with Venturi tubes.

Key topics and requirements

• Classification of Venturi tube types by inlet‑cone manufacture (cast unmachined, cast machined, welded from plate) and application limits.
• Geometric profile requirements (dimensions, radii, cone lengths, throat geometry) and maximum allowable deviations from template profiles.
• Beta ratio (d/D) ranges and Reynolds number limits for valid application and coefficient tables.
• Discharge coefficient (Cd) and expansion coefficient (ε) definitions, applicable ranges, recommended values and procedures for uncertainty estimation of these coefficients.
• Pressure‑tap arrangements and locations for reliable differential‑pressure measurement.
• Surface finish and roughness limits for inlet cone, throat and diffuser; inspection and acceptance criteria.
• Installation requirements: minimum upstream/downstream straight runs, use of flow straighteners/conditioners, mounting and alignment guidance, avoidance of nearby disturbances (bends, tees, valves) per classified limits.
• Testing, calibration and verification recommendations; handling of local losses and correction factors for fittings and pipe irregularities near the meter.

Typical use and users

Engineers and technicians in metrology laboratories, process and instrumentation engineering, oil & gas, water and wastewater utilities, power generation, chemical and petrochemical industries, and manufacturers of differential‑pressure flowmeters and Venturi tubes use this standard. It is used for design, production, installation acceptance, calibration, and uncertainty assessment of Venturi flowmeters where reliable volumetric flow and quantity measurement is required.

Related standards

ISO 5167‑4:2003 (Measurement of fluid flow by means of pressure differential devices — Part 4: Venturi tubes) — the international standard on which this document is based; other parts of the GOST 8.586 series (Part 1 — general principles and requirements; Part 2 — orifice plates; Part 3 — nozzles; Part 5 — guidance on installation and related requirements). The standard is often used together with national metrology requirements and other GOST/GOST‑R documents on flow measurement and uncertainty evaluation.

Keywords

Venturi tube, differential‑pressure flowmeter, discharge coefficient, expansion coefficient, beta ratio, flow measurement, metrology, ISO 5167‑4, GOST 8.586.4‑2005, installation requirements, uncertainty of measurement.

FAQ

Q: What is this standard?

A: GOST 8.586.4-2005 is a Russian/interstate standard that sets technical requirements for Venturi tubes used for measuring the flow rate and quantity of liquids and gases in full circular pipelines; it implements and modifies ISO 5167‑4:2003 for national use.

Q: What does it cover?

A: It covers Venturi tube types, geometric profiles and tolerances, materials and manufacture, pressure‑tap locations, applicable beta and Reynolds ranges, discharge and expansion coefficient values and uncertainty estimation, installation and mounting requirements, surface finish limits, testing and acceptance procedures.

Q: Who typically uses it?

A: Metrology institutes, calibration laboratories, process and instrumentation engineers, pipeline and flowmeter manufacturers, and utility operators who need standardized, traceable Venturi‑based flow measurements.

Q: Is it current or superseded?

A: As published, GOST 8.586.4‑2005 was introduced into force as a national/interstate standard on 1 January 2007 and is recorded as active in available national catalogs; users should verify current status with the national standards body or Rosstandart for any later revisions or replacements before relying on it for regulatory or contractual work.

Q: Is it part of a series?

A: Yes — it is Part 4 of the GOST 8.586 series dealing with measurement of flow rate and quantity of liquids and gases by differential‑pressure (standard) restricting devices; other parts in the series address general principles, orifice plates, nozzles, and related guidance.

Q: What are the key keywords?

A: Venturi tube, differential‑pressure, flowmeter, discharge coefficient (Cd), expansion coefficient (ε), beta ratio (d/D), Reynolds number, metrology, ISO 5167‑4, GOST 8.586.4‑2005.