张双蕾,明亮,李巧,陈凤,谭婉依.天然气长输管道压气站最大操作压力研究[J].天然气与石油,2021,39(2):1-5.doi:10.3969/j.issn.1006-5539.2021.02.001
ZHANG Shuanglei, MING Liang, LI Qiao, CHEN Feng, TAN Wanyi.Research on MOP for compressor station of long-distance pipeline[J].Natural Gas and Oil,2021,39(2):1-5.doi:10.3969/j.issn.1006-5539.2021.02.001
作者单位:
1. 中国石油工程建设有限公司西南分公司, 2. 国家管网粤东液化天然气有限责任公司
1. CPECC Southwest Company, Chengdu, Sichuan, 610041, China; 2. National Pipeline Network Yuedong LNG Co. , Ltd. , Jieyang, Guangdong, 515225, China
天然气;长输管道;压气站;最大操作压力(MOP)
Natural gas; Long-distance pipeline; Compressor station; MOP( maximum operating pressure )
中国天然气长输管道系统站场的压力设计通常与线路管道一致
,
遵循
GB
50251
《输气管道工程设计规范》，规范规定了最大允许操作压力
(MAOP)
等于或小于设计压力
(DP),
但管道的最大操作压力
(MOP)
与
MAOP
之间的裕量
,
并未强制要求。多年来
,
国内长输管道系统一般在压气站压缩机出口
MOP
与
DP
之间留出
0.15 MPa
裕量，但裕量是否合理并未得到论证。通过研究国内外长输管道系统设计规范
,
找出限制
MOP
的依据主要是事故工况下瞬变压力的超压值应不大于
MAOP
的
10%,
利用
SPS
模拟分析事故工况
,
对
DP
为
10 MPa
的长输管道常规做法进行了验证。结合现场实际运行压力的波动情况
,
给出了合理确定
MOP
的建议
,
对保证长输管道系统的安全、经济运行具有重要意义。
In China, for the long-distance pipeline system, usually
both the design pressure for compressor station and pipeline comply with GB
50251:Code for Design of Gas Transmission Pipeline Engineering, which
specifies the Maximum Allowable Operating Pressure( MAOP ) shall be equal to or
less than the Design Pressure( DP ). However, the margin between the Maximum
Operating Pressure( MOP ) and MAOP is not mandatory in this Code. For many
years, domestic long-distance pipeline system generally leaves a margin of 0.15
MPa between the MOP( at compressor discharge line in compressor station ) and
design pressure. But whether this margin is appropriate has not been
demonstrated. By studying the standards of long-distance pipeline systems at
home and abroad, it is found that the basis for limiting MOP is that the
overpressure value of transient pressure under accident conditions shall not be
greater than 10% of MAOP. The conventional practice of long-distance pipeline
with 10 MPa design pressure has been verified using SPS software to simulate
and analyze accident conditions. Moreover, considering the actual operating
pressure fluctuations on site, recommendation is given for determining optimal
MOP, which is of great significance to ensure the safe and economic operation
of the long-distance pipeline system.
