توضیحات :
BEACON SAFETY MASSAGE
ایمنی فرآیند
مه ۲۰۲۴
آیا لوله کشی با مشخصات مطابقت دارد؟
A vapor cloud explosion and fire led to one fatality and two serious injuries. At least 28 other workers were injured. About 10,000 lb. (4500 kg.) of flammable isobutylene was released when a 3-inch (75mm) Y-strainer failed, likely due to thermal expansion. The vapor cloud ignited causing an explosion.
This Beacon focuses on using piping materials approved in the pipe specification.
The Piping and Instrumentation Diagram (P&ID) for the piping had several errors. It didn’t show the Y-strainer, a check-valve nor a manual isolation valve. A Process Hazards Analysis (PHA) was performed when the system was installed and was revalidated about a year before the accident. No one noted that the P&ID did not match the field piping. According to the drawing, the piping was welded or flanged 304 stainless steel. The 3-inch diameter
cast iron Y-strainer was connected to the stainless steel line using threaded joints. Most industry pipe specifications would certainly prohibit 3-inch threaded connections in isobutylene service. Cast metal devices, like this strainer, are more brittle than stainless steel. They can fail and are specifically prohibited in pressurized hydrocarbon service by several industry piping standards.
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