Introduction
In the world of fuel storage, maintaining the quality of stored substances is paramount. Long-term storage tanks, often containing fuel for emergency and stored underground storage, and marine vessel storage tanks require rigorous and periodic inspections to ensure fuel quality. The introduction of an innovative automated sampling system promises to revolutionise this critical aspect of fuel management. This article explores the technical marvel behind this automated sampling system, designed to enhance efficiency, safety, and accuracy in collecting fuel samples from similar storage tanks.
Technical Overview
Traditionally, sampling fuel from top of the storage tanks involves a manual and labor-intensive process similar to Figure 1. Operators must repeatedly submerge a sample canister at various tank levels, a method prone to inaccuracies and inefficiencies. Additionally, the inability to accurately measure the submersion level of the canister poses significant challenges, especially in ensuring that samples are representative of the entire tank’s contents.
The new automated sampling system addresses these challenges by offering a fully automated process that collects samples at multiple tank levels in a single operation. This system is equipped with advanced features, including a controlled filling volume canister, a multistage diaphragm electrohydraulic level switch, and sampling valve actuators that operate at pre-programmed levels as shown in Figure 2.
System Components and Functionality
At the heart of this innovation is the sample collection chamber, designed to seamlessly integrate with the storage tank’s main body. The chamber is equipped with a DC motor, manual and automatic operation modes, and a sophisticated control panel. The DC motor operates a spring loaded reel that manages the umbilical cable, ensuring precise movement of the sampling canister.
A canister itself is a marvel of engineering, featuring three separate compartments for collecting samples at different tank levels. Each compartment is isolated to prevent cross-contamination, and the system can automatically calculate the opening time for butterfly valves to avoid overflow.
A tandem switch plays a crucial role in measuring the submersion level of the canister. This switch assembly, consisting of multiple diaphragms and a teethed rod mechanism, ensures accurate level detection and reliable switch contact actions.
A push/pull mechanism, along with an encoder system, guarantees precise control of the umbilical cable’s movement. This mechanism, driven by a spring-loaded block and sliding bars, maintains the necessary tension on the cable, ensuring accurate level measurement and sample collection.
A control panel provides operators with real-time monitoring and control capabilities. Features include manual and automatic operation modes, status indicators, and emergency shutdown options. The main controller governs the entire system, allowing for preconfigured sampling levels and ensuring the safety and reliability of the sampling process.
Implementation and Benefits
The automated sampling system significantly reduces the time and labor required for sampling operations. By automating the process, the system minimises the risk of human error and ensures consistent and accurate sampling. Additionally, the design incorporates safety measures to prevent electrical ignitions in explosive atmospheres, a critical consideration in fuel storage environments.
Operators can choose between fully automated, semi-automated, and manual modes, providing flexibility to meet various operational needs. The system’s main controller allows for customisation of sampling levels and sequences, ensuring that it can adapt to different tank configurations and requirements.
As the system undergoes further development and testing, its potential applications extend beyond fuel storage to other industries requiring precise liquid sampling. The ability to automate and accurately control the sampling process holds promise for enhancing quality assurance in numerous fields. As a result of deployment, underground storage facility as well as marine vessels will ensure accurate sampling, efficient operating, and time saving.
Conclusion
The automated sampling system for underground storage and vessel tanks represents a significant advancement in fuel management technology. By addressing the limitations of traditional sampling methods, this innovative solution offers improved efficiency, safety, and accuracy. As industries continue to prioritise quality and reliability, the adoption of such automated systems will undoubtedly become a standard practice, ensuring the integrity of stored substances and the safety of operations.
Author: Abdullah Aldahlan
For more information visit www.aramco.com
