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  • ASTM
    D7777-13 Standard Test Method for Density, Relative Density, or API Gravity of Liquid Petroleum by Portable Digital Density Meter
    Edition: 2013
    $103.58
    Unlimited Users per year

Description of ASTM-D7777 2013

ASTM D7777-13

Historical Standard: Standard Test Method for Density, Relative Density, or API Gravity of Liquid Petroleum by Portable Digital Density Meter




ASTM D7777

Scope

1.1 This test method covers the determination of the density, relative density, or API gravity of liquid petroleum products using portable digital density meters at test temperatures between 0 and 40°C (32 to 104°F). Its application is restricted to samples with a dry vapor pressure equivalent up to 80 kPa (11.6 psi) and a viscosity below 100 mm2/s (cSt) at the test temperature.

1.2 This test method is suitable for determining the density to the nearest 1 kg/m3. To determine the density to the nearest 0.1 kg/m3, use Test Method D4052.

1.3 This test method is easily calibrated and primarily suitable for field applications. It is important for the user to know and understand the electrical classification of the area in which the analyzer is to be used and to select an analyzer appropriate for that classification.

1.4 Test Methods D287, D1298, and D6822 are used in field applications. This test method provides an alternative field method that is easily calibrated and does not pose the hazard of hydrometer glass breakage present in current field methods.

1.5 Portable digital density meters measure the density and temperature of the filled-in sample at the sample temperature. The measured density and temperature are automatically converted into:

Density at 15°C / density at 60°F
Relative density 15°C/15°C / relative density 60°F/60°F
API gravity 15°C / API gravity 60°F

by the instrument using the calculation routines for Generalized Products as defined in Guide D1250.

1.6 If the density meter does not have in-built software to calculate the density at the reference temperature, this is calculated from the observed density at test temperature using the Petroleum Measurement Tables.

1.7 The accepted units of measure for density are kilograms per cubic metre (SI unit) or grams per cubic centimetre. Values in SI units are to be regarded as the standard. Values in parentheses are for information only. Both SI and customary units have been rounded; they may not be exactly equivalent.

1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


Keywords

API gravity; crude petroleum; density; hydrometer; Petroleum Measurement Tables; petroleum products; relative density; specific gravity


ICS Code

ICS Number Code 75.080 (Petroleum products in general)


DOI: 10.1520/D7777-13

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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