Temperature distribution is a critical indicator of the health condition for Liquefied Petroleum Gas (LPG) storage tanks. In this paper, we present large-scale wireless temperature monitoring system to evaluate safety LPG The includes sensors networks, high fiber-optic sensors, and software. Finally, case study on real-world tanks proves feasibility system. unique features transmission, automatic data acquisition management, local remote access make developed good alternative in practical...

Since liquefied natural gas (LNG) is stored at a temperature of about -160°C under ambient pressure, it unable to avoid unexpected generation boil-off (BOG) from LNG storage tanks due heat transfer the surroundings cryogenic system.Reasonable and effective treatment BOG, can not only reduce waste energy terminals, but also guarantee safety stability system.This paper puts up with novel process condense double-stage pre-cooled compressed BOG by means LNG.With aim minimizing total power...

For new submarine hot oil pipelines, accurate simulation of preheating is difficult owing to complex transient flow and coupled heat transfer happening. Using quasi-steady equations simulate inadequate as the hydraulic phenomenon neglected. Considering this fact, paper constructs an unsteady mathematical model for process. By combining double method characteristics (DMOC) finite element (FEM), a numerical methodology proposed, namely, DMOC-FEM. Its accuracy validated by field data collected...

Leakage may occur during pressure tests of gas pipelines. Locating the position leakage followed by immediate repair work becomes very important. On basis both theory natural pipeline transportation and procedure test, this paper established a mathematical model function discharge function, as well whole numerical simulation process, are studied in applying inversion to partial differential equations. The methods specified also can be used for detection an oil pipeline’s daily operation.

A long-distance natural gas pipeline system consists of considerable equipment and many pipe segments, but the conventional energy efficiency index a is considered as whole. Because specific consumption each unit cannot be determined, not perfect, evaluating difficult. The evaluation model for was established using analytic hierarchy process. judgment matrix constructed based on pipeline, weight coefficient calculated characteristic root method. Then, consistency verified. successfully...

This article proposes a novel low-complexity parallel message passing (PMP) detection scheme for orthogonal time-frequency space (OTFS) modulation technology. The traditional (MP) is to detect symbols individually. Due large number of loop nesting calculations in the process MP symbol detection, overall calculation time relatively long, and its efficiency lower. In PMP scheme, all are detected synchronously. optimizes structure algorithm, can significantly shorten time. A non-sparse channel...

Orthogonal time-frequency space (OTFS) is a two-dimensional (2D) modulation technology for processing high mobility communication signals. The integer delay and Doppler shifts can lead to significant modeling error in the delay-Doppler (DD) domain. To obtain accurate estimation of fractional DD domain channel, we propose novel two-step off-grid channel using Bayesian compressive sensing (BCS) OTFS systems. First, analyze vectorized form input-output relationship derive simplified expression...

Due to the head reliability and challenge of fabricating small grain size media with high SNR, schedule HAMR technology keeps pushing back. The PMR extension becomes very important provide enough time for emerging technologies be in place. As is approaching its areal density (AD) limit, AD gain from medium relatively more difficult. It requires other aspects, such as coding signal processing, HDI, etc.

Due to the formation of corrosion products, natural gas liquids and hydrates in long distance pipelines, timely effective pigging operations are necessary improve transmission efficiency, reduce pressure loss, as well guarantee safe operation wells, pipelines networks.Gas efficiency is a parameter reflect working condition cleanliness which calculated by division actual volume theoretical volume.In consideration characteristics calculation model presented this paper.A threshold value 90%...

Orthogonal time frequency space (OTFS) modulation can meet the challenges in high mobility environment. The signal detection for OTFS system is necessary, so that precise channel state information to improve accuracy essential. Therefore, we propose a complex Bayesian compressive sensing (CBCS) algorithm, which utilizes sparsity of channel. We first model by employing hierarchical Laplace prior. Then, based on marginal likelihood sparse signal, separate current hyperparameter and derive CBCS...

When leakage occur during pipeline pressure testing, the intensity of will attenuate continuously, which was assumed as a constant, so that location accuracy not good. To calculate and attenuation coefficient under inverse problem studied using numerical inversion technology based on model building direct leakage. Then existence uniqueness leakages were proved with principle contraction mapping, their solution methods obtained. Finally simulation analysis showed feasible easy to use high in theory.