GB/T 31971.2-2025Ships and marine technology - Marine environment protection: performance testing of oil skimmers - Part 2: Light and medium viscosity oil (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 2 of GB/T 31971 "Ships and Marine Technology - Marine Environmental Protection. Performance Testing of Skimmers".

The following parts of T31971 have been released.

---Part 1: Dynamic Water Conditions;

---Part 2: Medium and Low Viscosity Oils;

---Part 3: High Viscosity Oils this document replaces GB/T 31971.2-2015 "Ships and Marine Technology - Marine Environmental Protection. Performance Testing of Skimmers - Part 2." Compared with GB/T 31971.2-2015, the main technical changes in "Static Water Conditions" are as follows, except for structural adjustments and editorial modifications.

a) Increased the viscosity range for medium and low viscosity oils (see Chapter 1);

b) General requirements for performance parameters have been added (see 8.1).

This document is equivalent to ISO 21072-2:2020 "Ships and marine technology, marine environmental protection - performance testing of skimmers - Part 2".

Classification. Medium and low viscosity oils.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Marine Machinery (SAC/TC137).

Introduction

GB/T 31971 "Ships and Marine Technology - Marine Environmental Protection. Performance Testing of Oil Skimmers" specifies the performance requirements for oil skimmers used in marine pollution control.

The testing was standardized. Prior to this, oil skimmers that had undergone performance testing under non-standard conditions and procedures, especially under field conditions, had...

The measured performance parameters have limited value for end users.

GB/T 31971 aims to provide a method for conducting comprehensive tests on oil skimmers under different test conditions and recording the test results, so that end users can...

Objectively judge, compare and evaluate the design and performance of different types of oil skimmers.

GB/T 31971 consists of the following three parts.

---Part 1: Dynamic Water Conditions. The aim is to provide a method for quantitatively determining the performance data of oil skimmers under dynamic water conditions, applicable to...

Performance tests of the skimmer were conducted within the specified size limits of the test tank.

---Part 2: Medium and Low Viscosity Oils. The aim is to provide quantitative performance data for skimmers in recovering medium and low viscosity oils.

The method is applicable to performance testing of skimmers in the case of recovering medium and low viscosity oils.

---Part 3: High Viscosity Oils. The aim is to provide a method for quantitatively determining performance data for skimmers in the recovery of high viscosity oils.

This method is applicable to performance testing of skimmers in the case of recovering high-viscosity oil.

Ships and Marine Technology. Marine Environmental Protection Oil skimmer performance test Part 2: Medium and low viscosity oils

1 Scope

This document specifies the method for determining the quantitative performance data of oil skimmers when recovering medium-low viscosity oils with a viscosity not exceeding 50,000 cP.

This method aims to enable end users to objectively evaluate, compare, and assess the design and performance of different types of oil skimmers. The methods specified in this document are applicable to water...

Tests in tanks that require control of oil and floating oil characteristics.

This document applies to all types of skimmers whose dimensions fall within the range of the test tank. The test procedures specified in this document are performed under the specified control conditions.

The following provides comprehensive test results for the tested apparatus, applicable to one or more medium- to low-viscosity oils. When using these test results to predict skimming...

When assessing the performance of the oiler under field conditions, attention must be paid to the required details.

For dedicated/embedded systems, the test procedures specified in this document apply only to skimming equipment that meets the test conditions, and not to the entire system.

An oil skimming system.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

Note. GB/T 21478-2024 Marine Technology Marine Environmental Protection Oil Spill Treatment Vocabulary (ISO 16165:2020, IDT).

3 Terms and Definitions

The terms and definitions defined in ISO 16165 and the following terms and definitions apply to this document.

Data collection period. datacolectionperiod During the steady-state period (3.9), the time period during which the recovered liquid is collected to determine performance data.

Debris

Solid or semi-solid substances that interfere with the operation of oil spill control systems.

The amount of water emulsified into the oil due to the skimming/suction process, but excluding the water in the original test liquid.

Note. Use decimals between 0 and 1.

Fluid recovery rate (FRR) the total volume of liquid recovered per unit time.

Note. The unit is cubic meters per hour (m3/h).