Must a fully welded, buried natural gas pipeline ball valve with full bore be equipped with dual vent pipes?
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I would like to ask the experts: Must ball valves for fully welded, buried natural gas pipelines with full flow paths be equipped with dual vent pipes? What is the function of the dual exhaust pipes?
Fully welded buried natural gas pipeline ball valves with full bore, available with or without dual vent pipes, as determined by requirements; one side may be equipped with them. The function of the dual vent pipes is to vent the natural gas between the shut-off valves.
The function of the dual discharge pipes is to vent the natural gas in the pipeline between the shut-off valves.