SIST EN ISO 17778:2015 PDF

Name: SIST EN ISO 17778:2015 — Plastics piping systems - Fittings, valves and ancillaries - Determination of gaseous flow rate/pressure drop relationships (ISO 17778:2015)
SKU: SIST EN ISO 17778:2015
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Plastics piping systems - Fittings, valves and ancillaries - Determination of gaseous flow rate/pressure drop relationships (ISO 17778:2015)

Название (английский):

SIST EN ISO 17778:2015

Plastics piping systems - Fittings, valves and ancillaries - Determination of gaseous flow rate/pressure drop relationships (ISO 17778:2015)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 12
Дата публикации:: 18 мая 2015 г.
ICS:: 83.140.30
Технический комитет:: PCV - Plastic pipes, fittings and valves

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Описание (английский):

ISO 17778:2015 specifies a method for determining the flow rate/pressure drop relationship of components for plastics piping systems when tested using air at 25 mbar.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты SIST

Overview

EN ISO 17778:2015 specifies a laboratory method to determine the gaseous flow rate / pressure drop relationship of components used in plastics piping systems (fittings, valves and ancillaries). Tests are carried out using air at 25 mbar and produce a characteristic factor that relates pressure loss to flow rate. The standard is intended for manufacturers, test laboratories and specifiers who need repeatable, comparable gas-flow performance data for plastic piping components.

Key Topics

Scope and principle

Method for measuring pressure drop (Δp) versus volumetric flow (Q) under a constant main pressure of (25 ± 0.5) mbar.
Outputs include velocity (V), a flow/pressure factor (F) and equivalent flow rates for other gases.

Apparatus and accuracy

Pressure controller to hold main line pressure at 25 mbar.
Flow meter (positive displacement or turbine) with accuracy ±2%.
Pressure manometers: main-line manometer (class 0.6) and differential manometer (class 0.25) per EN 837‑1.
Typical test rig schematic (pressure controller, flow meter, test component, outlet valve).

Test pieces & preparation

Component fused/connected between two plastic pipe lengths; pressure tapping points flush with bore.
For tapping tees, pressure drop measured through the outlet branch.

Procedure & acceptance criteria

Perform tests at (23 ± 2) °C, vary outlet valve to obtain multiple Q/Δp pairs.
Minimum five data sets required; velocity V must include at least one ≤ 2.5 m/s and one ≥ 7.5 m/s (if unattainable at 25 mbar, report observation).

Calculations

Velocity V = Q / A (Q in m³/h, A bore area in m²).
Factor F = Δp / Q² (average F expresses the pressure-drop/flow relationship).
Convert air flow to other gases using the density ratio provided by the standard (Q_gas = (ρ_air / ρ_gas) × Q_air).

Test report content

Reference to ISO 17778, component ID, materials, measured Q/Δp/V, average F, calculated flows for air and other gases, deviations and test date.

Applications

Establishing performance data for plastic fittings, valves and ancillaries used in low‑pressure gas distribution and industrial systems.

Supporting product datasheets, type testing, conformity assessment and sizing/selection in gas distribution networks.

Useful to manufacturers, independent test laboratories, utilities, system designers and regulatory bodies specifying flow/pressure-loss limits.

SIST EN ISO 17778:2015 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

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