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Safety Inspection Guide for NXQA-40/31.5-L Fire-Resistant Oil Accumulator

Safety Inspection Guide for NXQA-40/31.5-L Fire-Resistant Oil Accumulator

In a power plant’s steam turbine fire-resistant oil system, accumulators serve as key energy storage and pressure regulators. Their stable operation is crucial to the safety and reliability of the entire system. The NXQA-40/31.5-L accumulator, a crucial component of this system, maintains accurate nitrogen pressure, directly impacting the system’s proper operation. Over time, the accumulator’s nitrogen pressure may fluctuate, making regular safety inspections crucial. This article details the nitrogen pressure safety inspection methods for the NXQA-40/31.5-L bladder accumulator to ensure stable operation of the power plant’s steam turbine fire-resistant oil system.

 

1. Why Check the Nitrogen Pressure in the Accumulator?

 

Accumulators play multiple roles in a power plant’s steam turbine fire-resistant oil system. They not only absorb hydraulic shock, but also eliminate pulsation, reduce noise, and even recover energy. Maintaining the nitrogen pressure within the NXQA-40/31.5-L accumulator is essential for ensuring the proper functioning of these functions. If the accumulator’s nitrogen pressure is insufficient, the accumulator may not be able to effectively absorb hydraulic shocks, resulting in increased system pressure fluctuations and even damage to sensitive instruments and components. Therefore, regular inspection of the accumulator’s nitrogen pressure is critical to ensuring safe power plant operation.

 

II. How to Check?

Before checking the accumulator’s nitrogen pressure, the system must be in a safe state. First, close the shutoff valve connected to the accumulator to allow the pressurized oil in the accumulator to flow back to the tank, ensuring the accumulator is depressurized. This step is crucial, as performing the inspection while pressurized can lead to a dangerous situation. Before inspection, it is essential to ensure that the accumulator is fully depressurized. This is essential for operator safety. For NXQA-40/31.5-L accumulators, the operator should first open the manual shutoff valve to allow the pressurized oil in the accumulator to flow back to the tank until the pressure gauge returns to zero, confirming that the accumulator is fully depressurized.

 

Next, connect a dedicated pressure measuring tool to the accumulator’s charging port. The pressure measuring tool should be specifically designed for the accumulator to ensure accurate readings of nitrogen pressure. According to standard operating procedures, the nitrogen pressure in the accumulator should be maintained between 60% and 80% of the system operating pressure. For the NXQA-40/31.5-L accumulator, the design operating pressure is 31.5 MPa, so the nitrogen pressure should be between 18.9 and 25.2 MPa. If the pressure measurement shows the nitrogen pressure is below this range, charging is necessary. When checking the nitrogen pressure in the accumulator, slowly open the charging valve and observe the pressure gauge to ensure a steady rise and fall.

 

When checking the nitrogen pressure in the accumulator, pay special attention to slowness and accuracy. Rapid inflation or deflation may damage the bladder inside the accumulator, affecting its proper function. During the inspection, closely monitor the pressure gauge to avoid excessive pressure fluctuations. If the pressure gauge pointer fluctuates significantly, stop operation immediately and check for leaks or other problems. At the same time, ensure the surrounding environment is clean to prevent oil and dust from entering the accumulator’s charging port. The operating area should be well ventilated to prevent nitrogen accumulation and the risk of asphyxiation.

 

When checking the accumulator’s nitrogen pressure, avoid using inappropriate tools or methods. For example, do not use a standard pressure gauge instead of a dedicated pressure measuring tool, do not check while the system is running, and do not disassemble the accumulator without relieving the pressure. These improper operations may lead to safety accidents or damage to the accumulator. Operators should always adhere to the principle of safety first and strictly follow operating procedures when checking the accumulator’s nitrogen pressure.

 

After the inspection, ensure that the accumulator’s charging port is properly sealed to prevent the ingress of air or moisture. Also, clean the work area and ensure a tidy environment. For NXQA-40/31.5-L accumulators, after the inspection, reconfirm that the nitrogen pressure is within the normal range to ensure safe and stable system operation.

 

III. Daily Maintenance and Charging of Nitrogen Pressure

Regularly checking the accumulator’s nitrogen pressure is an important part of preventive maintenance. It’s recommended to check the accumulator’s nitrogen pressure weekly during the initial system operation; monthly after one month; quarterly after six months; and annually after one year. Regular inspections can identify potential accumulator problems early and prevent system failures caused by insufficient nitrogen pressure. During the inspection process, detailed records should be kept, including the inspection date, nitrogen pressure, and operator. These records will help track the accumulator’s operating status and provide a reference for subsequent maintenance.

 

If the accumulator’s nitrogen pressure is found to be below the specified range, it should be promptly inflated. For NXQA-40/31.5-L accumulators, if the pressure is below 25 MPa, use a dedicated nitrogen charging tool to inflate until the nitrogen pressure reaches approximately 25 MPa. To inflate, first connect the nitrogen cylinder to the charging tool, then connect the charging tool to the accumulator. Then, slowly open the nitrogen cylinder valve to allow nitrogen to slowly fill the accumulator. During the charging process, closely monitor the pressure gauge to ensure the pressure does not exceed the safe range.

 

After charging, inspect the accumulator for leaks. Apply soapy water around the charging port and observe for bubbles. If bubbles are present, this indicates a leak and requires reconnection or replacement of the seal. Additionally, inspect the accumulator’s appearance to confirm there are no obvious damage or deformation. For accumulators operating for extended periods, the condition of the internal bladder is also important. This is a critical component; damage can allow hydraulic fluid to enter the chamber, impacting the accumulator’s proper functioning.

 

In a power plant’s steam turbine fire-resistant fuel system, the proper functioning of the accumulator is directly related to the safe and stable operation of the entire system. As a critical component in the system, the accuracy and stability of the nitrogen pressure in the NXQA-40/31.5-L accumulator are crucial. Proper inspection and maintenance can effectively prevent accumulator failures, extend equipment life, and improve the overall efficiency of the power plant.

 

When looking for high-quality, reliable bladder accumulators, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:
E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229
Yoyik offers various types of power plants spare parts for steam turbines, generators, boilers as below:
Stop Valve J61Y-320 25
Accumulator Rubber Bag Viton 40L
Valve, Control; Type: Flow, Servo G761-3002B
Globe Valve Wj41B4.0P
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Electric Gate Valve Z961Y-600Lb
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Pneumatic Steam Trap J661Y-100V
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High Pressure Hoses 16Iii-1000
Electric Stop Valve J961Y-40
Stop Valve J65Y-P55.5190V Sa-182 F91
Submerged Pump 100Yw50-100-50-30
Bellows Valves Wj20F1.6P-Ii
Automatic Steam Trap Dt421H-25
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Electric Gate Valve Z264Y-250 Wcb
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Fluid Coupling Yoxiiz500
Stop Valve J61Y-63
Accumulator Bladder Nxqa-50/31.5-L-Yj-5
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High Outlet Plug Valve Sd61H-P55185V Sa-182 F91


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  • Post time: Sep-05-2025