GOST 8.586.2-2005 PDF

Full title and description

GOST 8.586.2-2005 — State system for ensuring the uniformity of measurements. Measurement of liquids and gases flow rate and quantity by means of orifice instruments. Part 2. Orifice plates (diaphragms). Technical requirements. (Russian: ГОСТ 8.586.2-2005. Измерение расхода и количества жидкостей и газов с помощью стандартных сужающих устройств. Часть 2. Диафрагмы. Технические требования.) The standard specifies geometric, manufacturing and application requirements for orifice plates used to determine flow rate and quantity of liquids and gases in circular pipelines.

Abstract

This part of the GOST series establishes technical requirements for orifice plates (diaphragms) including permitted geometries, diameter and relative-diameter ranges, pressure-tap arrangements (corner/angle, flange, three-radius), surface finish and installation/straight‑run conditions necessary to achieve traceable, repeatable flow measurements. It is aligned with internationally recognized practice (references ISO 5167-2:2003) and intended for use with the companion general and procedural parts of the series.

General information

• Status: Active / in force.
• Publication date: Designation year 2005; introduced into force 01 January 2007 (with errata/amendment published subsequently in 2007).
• Publisher: Adopted by the Interstate Council for Standardization, Metrology and Certification; introduced/issued by the Federal Agency on Technical Regulation and Metrology (Rosstandart).
• ICS / categories: ICS 17.020 (Metrology and measurement); OKS / OCS classification related to metrology and flow measurement.
• Edition / version: GOST 8.586.2-2005 (original 2005 edition; effective from 2007; contains amendment/errata in 2007).
• Number of pages: 43 pages (standard text).

Key bibliographic and status information above is recorded in Russian standards catalogs and commercial standards libraries.

Scope

The standard applies to orifice plates (diaphragms) installed in circular cross‑section pipelines for measurement of flow rate and total quantity of liquids and gases. It covers geometric characteristics of plates, allowable relative diameters (typically r = d/D between about 0.10 and 0.75 with minimum absolute diameters), requirements for pressure‑tap locations and types (corner/angle, flange, three‑radius), surface roughness limits, straight‑run and upstream/downstream installation conditions, and rules for determining measurement uncertainty related to plate geometry and installation. The standard is intended to be used together with GOST 8.586.1 (general requirements) and the procedural part(s) of the series.

Key topics and requirements

• Geometric definitions and tolerances for orifice plates (diameter, concentricity, edge sharpness and profile).
• Permitted relative diameter range and minimum absolute diameter values; measurement and rounding rules for d and D.
• Specified pressure‑tap arrangements: corner (angle), three‑radius and flange taps; minimum number and placement of taps.
• Surface finish (roughness) requirements for the upstream pipe section and their effect on discharge coefficient and uncertainty.
• Installation requirements — minimum straight‑run lengths upstream/downstream, treatment of local disturbances and combined local resistances.
• Reference to and consistency with ISO 5167‑2:2003 methods for calculating flow and discharge coefficient where applicable.

The standard includes formulae and tables to calculate allowable roughness limits, correction coefficients and guidance for estimating additional uncertainty when installation lengths are reduced.

Typical use and users

Primary users are metrology laboratories, flow‑measurement engineers, pipeline designers, manufacturers of flow‑meters and process instrumentation, oil & gas and utility companies, and organisations responsible for custody transfer and fiscal metering. It is used to design, specify, install and verify orifice‑based flow meters to ensure measurement traceability and acceptable uncertainty for process control, custody transfer and regulatory reporting.

Related standards

Companion and related documents include: GOST 8.586.1-2005 (Part 1 — principles and general requirements), GOST 8.586.3-2005 (nozzles and Venturi nozzles), GOST 8.586.4-2005 (Venturi tubes), GOST 8.586.5-2005 (measurement procedure). The standard references ISO 5167‑2:2003 and also lists other national GOSTs cited for materials, fittings and test methods (examples: ГОСТ 17378‑2001, ГОСТ 24856‑81 as normative references).

Keywords

orifice plate; diaphragm; flow measurement; discharge coefficient; pressure taps; pipeline metrology; flowmeter installation; ISO 5167; metrology; GOST 8.586 series.

FAQ

Q: What is this standard?

A: GOST 8.586.2-2005 is the national (interstate) standard that specifies technical requirements for orifice plates (diaphragms) used in flow measurement of liquids and gases. It is Part 2 of a multi‑part series on measurement with standard restricting devices.

Q: What does it cover?

A: It covers geometry and manufacturing tolerances of orifice plates, allowable diameter ranges, pressure‑tap types and placement, surface finish and straight‑run installation requirements, and related guidance for estimating the effect of installation on measurement uncertainty.

Q: Who typically uses it?

A: Metrologists, flow‑measurement specialists, instrumentation engineers, manufacturers of orifice plates and flowmeters, pipeline operators (including oil & gas and utilities), and laboratories involved in verification and calibration of flow measurement systems.

Q: Is it current or superseded?

A: The standard is recorded as in force (active) and was introduced for use on 01 January 2007; an erratum/amendment was issued in 2007. Users should verify the current status with the national standards body before use, since national catalogues and commercial standards libraries list it as active but note published amendments.

Q: Is it part of a series?

A: Yes — it is Part 2 of the GOST 8.586 series on measurement of flow and quantity by means of standard restricting devices; other parts cover principles, nozzles, Venturi tubes and measurement procedure (Parts 1, 3, 4 and 5 respectively).

Q: What are the key keywords?

A: Orifice plate, diaphragm, flow rate, flow quantity, pressure taps, discharge coefficient, ISO 5167, metrology, GOST 8.586.