ISO 13757:1996

Name: ISO 13757:1996 — Liquefied petroleum gases — Determination of oily residues — High-temperature method
SKU: ISO 13757:1996
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Liquefied petroleum gases — Determination of oily residues — High-temperature method

Название (английский):

ISO 13757:1996

Liquefied petroleum gases — Determination of oily residues — High-temperature method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 11 июля 1996 г.
Издание:: ISO IS 13757 edition 1 version 1
ICS:: 75.160.30

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Описание (английский):

La présente Norme internationale prescrit une procédure pour la détermination des résidus pouvant être contenus dans les gaz de pétrole liquéfiés (GPL), subsistant après évaporation à 105 °C. Ces résidus, dénommés «résidus huileux», correspondent à tous les produits piégés dans les systèmes de vaporisation qui sont susceptibles d'être soumis à un apport calorifique externe supérieur à l'évaporation ambiante.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 13757:1996 - Liquefied petroleum gases - Determination of oily residues (high‑temperature method) defines a laboratory procedure to quantify the residual oily matter left in LPG after evaporation at 105 °C. The standard describes sampling, solvent extraction, concentration, oven drying and gravimetric determination of oily residues and includes safety cautions for hazardous materials and equipment. Results are reported in mg/kg (milligrams per kilogram) LPG.

Key topics and requirements

Purpose and principle: Concentrate a filtered LPG sample by evaporation, extract the concentrate into dichloromethane (methylene chloride), evaporate the solvent using a rotary evaporator, dry the residue at 105 °C (1 h) and weigh the oily residue gravimetrically.

Reagents: Analytical-grade dichloromethane (or pentane as an alternative where dichloromethane is restricted), acetone, ammonium peroxodisulfate/sulfuric acid (for cleaning), and solid CO2 for deep cooling baths.

Apparatus and sampling: Stainless-steel sample cylinder with valves and dip tube, in-line filter with 0.8 μm membrane, stainless cooling coil (coiled tubing), rotary evaporator, 200 cm3 round-bottom evaporation flask (tare requirements), oven (105 °C), precision balances, desiccator and appropriate needle valves. Typical sample mass taken: ~800–1 200 g.

Procedure controls: Rinse lines with solvent and LPG, perform blank measurements, avoid vacuum on the evaporator during solvent removal, and ensure glassware cleaning and tare procedures as specified.

Safety: Work under explosion-proof hood or open-air with earthing to prevent static; handle dichloromethane and oxidizing cleaning solutions with appropriate PPE and fume extraction.

Precision: Interlaboratory precision reported for samples with oily residues 70–100 mg/kg: repeatability r = 15 mg/kg and reproducibility R = 50 mg/kg.

Reporting: Report result to nearest 1 mg/kg and include method reference, product identification, solvent used, any deviations, and test date.

Applications

Routine quality control and acceptance testing of LPG batches to detect deposit-forming residues.

Regulatory compliance and product specification verification for LPG producers, distributors and importers.

Laboratory analysis in industrial testing labs, refineries and third‑party testing services assessing LPG cleanliness for burners, vaporizers and customer delivery.

Supporting equipment manufacturers and maintenance teams concerned with fouling of vaporizers and heat exchangers due to oily deposits.

Related standards

ISO 3696:1987 - Water for analytical laboratory use (referenced for water quality).

ISO 4257:1988 - Method of sampling LPG (normative sampling reference).

Annex A of ISO 13757 provides examples of commercially available equipment and cleaning agents.

Keywords: ISO 13757:1996, LPG oily residues, high‑temperature method, dichloromethane, rotary evaporator, gravimetric determination, LPG testing, quality control.

ISO 13757:1996

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications

Related standards

Технические детали

ISO 3696:1987

Water for analytical laboratory use — Specification and test methods

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