Spark gap
Application of lightning protection for insulated joints
The high voltage caused by direct lightning and induced lightning will lead
to the breakdown and damage of pipeline insulating parts such as
insulating joint, insulating flange and insulating ferrule on the pipeline,
and lead to the short circuit of pipeline insulating parts and loss of
insulation function. The failure of insulation of pipeline insulation will lead
to the failure of regional cathodic protection. At the same time, the
mechanical damage of insulation caused by overvoltage will also lead to
oil and gas leakage accidents. The purpose of eliminating overvoltage
can be achieved by bridging the spark gap at both ends of the insulator or
connecting a set of spark gap to the ground on both sides of the insulator.
The low residual voltage of spark gap can effectively protect the pipeline
insulation from lightning overvoltage.
>>Cathodic protection and isolation: the spark gap has high DC voltage
conduction acteristics. provides DC 750V and 1500V conduction
voltage options, which can completely isolate the cathodic protection at
both ends of the pipeline insulation.
>>Lightning overvoltage protection: spark gap can protect 8 / 20 μ S
inductive lightning, and can protect 10 / 350 μ S direct lightning strike is a
T1 + T2 protective product in terms of lightning protection classification.
The way of direct lightning strike on the insulated joint of pipeline is
mainly the vent pipe of station and valve chamber.
Enclosure protection class
The electric spark gap adopts multi-layer fully sealed packaging process.
The protection grade of silicone rubber shell is IP68, which is suitable for
underground, surface open air and surface box installation areas under
all working conditions. The protection grade of stainless steel shell is
IP65, which is suitable for surface open air or box installation areas.
Product accessories (see attached figure for details)
The spark gap can be directly connected to the pipeline through cable
welding and bolts, or installed through the installation box and support.
Product inspection (see attached figure for details)
The electric spark gap shall be inspected and maintained regularly.
