ST-47 Groundhog Static Ground Proving Control Unit

Don't let unsure grounding methods leave you guessing. Transport vehicles should be properly tied to ground before and during the loading operation. There should never be any doubt that the grounding systems at your terminals are performing their proper function. Many systems give you little assurance of their operation. The Scully Groundhog gives you complete assurance that a proper static ground tie-in is present. 

The Groundhog is a self-proving ground verification system for maximum safety in loading operations. It can operate in conjunction with your existing Scully Overfill Prevention System or as an independent unit. Scully Signal Company has over 30 years of electronic liquid handling experience providing the ultimate dependability, service and safety. 

The Scully Groundhog ground verification system can be used for a wide variety of loading applications for use with tank trucks, rail cars, and aircraft refuelers.

IMPORTANT 

Static grounding is used to dissipate any static charges which can build up as a result of product flow or other vehicle movement. These charges over time may build up and exceed the ratings of the ST-47. Some applications such as rail lines and pipelines may also have stray currents present. In these situations the vehicle, rail, and pipeline must be bonded to ground independently from the Scully system. 

Local codes should be consulted regarding wire gauges and number of conductors. Refer to American Petroleum Institute (API) Recommended Practice 2003 “Protection Against Ignitions Arising out of Static, Lightning, and Stray Currents”, and NFPA 77, s Arising out of Static, Lightning, and Stra. for accepted earth bonding practices.