This document provides technical solutions and explanations for common issues related to vibration-resistant pressure gauges, including maintenance practices, design considerations, and operational guidelines. The content is derived from practical engineering expertise and aims to address challenges such as gauge durability, fluid dynamics in pipelines, and proper installation techniques.
Q: Excessive pipeline shock causes repeated damage to pressure gauges. Are there solutions beyond replacing with vibration-resistant gauges?
A: First, inspect and maintain the pipeline to identify loose connections, seal failures, or rapid fluid directional changes. If no issues are found, upgrade to higher-quality vibration-resistant gauges, such as Qingdao Xiruit’s silicone oil-filled models, which offer superior shock absorption. If failures persist, redesign the pipeline to mitigate shock—e.g., adjust layout, add supports, or modify valve operation.
Q: Should the oil seal on a Vibration-Resistant Pressure Gauges be cut open?
A: Prior to use, the raised portion of the oil vent plug must be removed or opened to allow atmospheric communication. If leakage is a concern, retain the plug. If the pointer fails to return to zero during operation, remove the plug temporarily to reset the pointer, then reinstall it.
Q: Can adhesive tape temporarily seal a missing oil vent plug to prevent oil leakage?
A: While adhesive tape may serve as a short-term fix, it is not recommended. If used, puncture small holes in the tape for ventilation. Replace the plug promptly, as tape may degrade under pressure or temperature fluctuations.
Q: What fluid fills the gauge dial, and what is its purpose?
A: Vibration-resistant gauges are filled with glycerol (low-cost) or silicone oil (high-performance). Silicone oil is used in premium gauges, such as Qingdao Xiruit’s models. The fluid dampens pointer oscillation, stabilizes readings, and protects internal components from environmental damage.
Q: Why do bubbles form in the damping fluid?
A: Bubbles in glycerol indicate entrapped air, moisture, or gas release due to vibration. Silicone oil typically remains bubble-free. To resolve, vent the gauge by removing the plug to release trapped air.
Q: Why is the damping fluid not fully filled, and what is the optimal level?
A: To accommodate thermal expansion and prevent pressure-induced inaccuracies (especially in low-range gauges), the fluid level should occupy 3/4 of the dial height. Residual air provides additional shock absorption.
Q: How do vibration-resistant and general pressure gauges differ?
A: Vibration-resistant gauges feature internal damping mechanisms (e.g., fluid-filled chambers) and robust construction to withstand harsh environments. Standard gauges lack these enhancements and are unsuitable for high-vibration applications.
Q: How to address a non-zero pointer reading under zero pressure?
A: Remove the oil vent plug to equalize internal and atmospheric pressure. If the pointer remains off-zero, inspect or replace the gauge, as internal spring or hairspring components may be faulty.
Q: How to interpret readings on a vibration-resistant gauge?
A: For a 0–1.6 MPa gauge, each major division (black scale) equals 0.4 MPa, subdivided into 0.05 MPa increments. The red scale (kgf/cm²) follows the conversion: 1 MPa = 10 kgf/cm².
Q: Can glycerol be manually added to a non-filled gauge?
A: While technically possible, this is discouraged. Non-specialized gauges may lack compatibility, and improper filling risks safety or performance issues. Pre-filled gauges are recommended. Note: Glycerol freezes in outdoor winter conditions.
Q: Can a gauge function without damping fluid?
A: Yes, but it loses vibration resistance, leading to erratic pointer movement and inaccurate readings. Refill or replace the gauge promptly.
Q: Should hydrogen pipelines use vibration-resistant or hydrogen-specific gauges?
A: Hydrogen-specific gauges with rubber seals and stainless steel construction are recommended, particularly for high-pressure applications.
Q: Can vibration-resistant gauges be installed on steam pipelines?
A: Yes, but include accessories like siphon tubes and needle valves upstream to reduce thermal and mechanical stress on the gauge.
Q: Why does silicone oil discolor in vibration-resistant electrical contact gauges?
A: Discoloration results from oil aging, oxidation (accelerated by heat/humidity), contamination, substandard oil batches, or prolonged storage.
Conclusion
Effective management of pressure gauge performance requires adherence to maintenance protocols, proper component selection, and environmental considerations. Key measures include using silicone oil-filled gauges for critical applications, ensuring optimal fluid levels, and addressing pipeline dynamics to minimize shock. For specialized environments (e.g., hydrogen, steam), select gauges and accessories designed for specific operational demands. Regular inspection and timely replacement of degraded components are essential for long-term reliability.
