Why is the piece of iron between the two pipe flanges?
Are you talking about gaskets?Sealing action
Jumper wire.Specification: a cross wire shall be provided when the resistance between each pair of flanges and threads exceeds 0.03 ohms. The engineering practice shows that the pipeline has just completed the installation, the resistance between flange and threaded joints are less than 0.03, but the system is put into use, with the extension of time, due to corrosion and other attachments, flange and threaded joint resistance between more than 0.03 ohms, so as to leave the safety operation system therefore, risks, oxygen pipeline, acetylene pipeline, gas pipeline system, flange and threaded joints should be provided across the wire. For crossing connections - 25 * 4mm of flat steel can also be used to straddle 12mm rounds of steel,
This is called a flange gasket, which acts as a seal to prevent liquid from leaking through the flange joint.
