An Optical Time Domain Reflectometer can identify bends, breaks, or reflection points along the pigtail. If the trace shows abnormal spikes near the connector, the end face may be damaged. This measures how much signal the fiber pigtail absorbs or blocks. In industrial piping systems, it is common to see a curved pipe section—often referred to as a siphon tube, gauge bend, or pigtail —installed below a pressure gauge. While it may seem like a minor detail, this bend serves several critical engineering purposes that protect the gauge and improve. A pigtail is a coiled or looped section of tubing used in piping and instrumentation systems to absorb vibration, manage thermal expansion, and protect pressure instruments from direct exposure to process media. Moreover, its curved design allows it to flex under temperature or pressure changes. This is why understanding how to effectively test a pigtail with a multimeter is crucial for electricians, technicians, and DIY enthusiasts alike. This comprehensive guide will equip you with the knowledge and skills to accurately assess the integrity of a pigtail, helping you identify issues. Its full name is the Pigtail siphon. This paper explains the cause of the failures, the follow up incident investigation and the actions taken to prevent recurrence of a similar failure.
