shipboard operation.
2007-01-16 20:01:29 · 3 answers · asked by SC 1 in Science & Mathematics ➔ Engineering
A PV is installed on an oil tankers tank to prevent a pressure or vacuum build up. Either can stress the tank walls and cause buckling and or failure.
An inerting system displaces the oxygen in the air space above the liquid in the tank thereby minimizing or eliminating the potential of igniting the fuel rich air above the liquid
if a PV valve were to fail open after the tank was inerted, air containing oxygen could return into the tank thereby negating the effectiveness of the inerting. If the PV valve is stuck closed it is possible to over pressureize the tank during inerting. Also the displaced air may not be vented properly trapping a pocket of oxygen (air) again either negatating or minimizing the inerting.
2007-01-16 23:29:32 · answer #1 · answered by MarkG 7 · 0⤊ 0⤋
Still not enough information.
I'm assuming you're talking about something in the engineering spaces. If that's the case, the specific effects of the gas released have to be assessed before hand and a procedure should already be in place if it's an expected occurrence.
On my ship, typical follow ups might be shutting down the equipment, clearing the space, closing off ventilation, alerting damage control central and the gas free engineer (usually the chief engineer).
2007-01-17 04:07:00 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Don't use pressure vacuum breakers on gas lines. Pressure regulators are used on gas lines. They rarely fail, inert gas is low pressure. Venting flammable gas is a bad idea.
2007-01-17 04:27:38 · answer #3 · answered by Anonymous · 0⤊ 0⤋