GB/T 11062-2020 in English

VALID

Natural gas—Calculation of calorific values,density,relative density and Wobbe indices from composition

Issued on:2020-09-29
Implemented on:2021-04-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $630.00
$612.00

Standard No:	GB/T 11062-2020
Document status:	VALID
Title in English:	Natural gas—Calculation of calorific values,density,relative density and Wobbe indices from composition
Title in Chinese:	天然气发热量、密度、相对密度和沃泊指数的计算方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2020-09-29
Implemented on:	2021-04-01
Superseding:	GB/T 11062-2014 Natural gas-Calculation of calorific values, density, relative density and Wobbe index from composition
ICS Classification:	75.060-Natural gas
Chinese Classification:	E24-Natural gas
Professional Classification:	GB-National Standard
Related Keywords:	natural gas calculation standard calculation parameters ideal gas formula real gas correction high calorific value ∑ natural gas real gas correction formula series gas chromatography
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《GB/T 11062-2020天然气发热量、密度、相对密度和沃泊指数的计算方法》由TC244（全国天然气标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

Analysis of the core content of the standard

Calculation parameters	Ideal gas formula	Real gas correction
High calorific value	∑(x_j·H_c,G,j^o)	Z factor corrected volume
Density	M/V^o	D = D^o/Z

Key Technical Points

Compression factor calculation example

Using the summation factor method: Z = 1 - (p₂/p₀)²·∑(x_j·s_j)², when p₀=101.325kPa, s_j of methane at 15℃=0.04452 (see Table 2).

Uncertainty Assessment

Take high calorific value as an example: u²(H_c,G) = ∑∑[∂H/∂x_i·u(x_i)·r(x_i,x_j)·u(x_j)] + ∑x_i²·u²(H_c,G,i)

Comparison of Standard Evolution

Version	Main Changes
2014 Edition	Applicable only to dry natural gas
2020 Edition	Expanded to wet natural gas, updated compression factor calculation formula, added uncertainty description

Implementation recommendations

ISO 6974 series gas chromatography is recommended for component analysis
The real gas correction formula is valid when Z>0.9
The calculation result should report the expanded uncertainty (k=2)

More samples: JJG 21-2008 JGJ 94-2008 YD/T 3934-2021

Sample only — not a preview of GB/T 11062-2020

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