F.E. Lewis, discipline authority, process engineering
BP America Inc., Houston, Texas
Add bleed valves
Dan Iezek, manager, engineering and maintenance
Pfizer Global Manufacturing, Franklin, Ohio
Break flange for non-hazardous fluid
Michael Hartzes, senior process engineer
CDI Engineering Group Inc., Houston, Texas
Lock Out/Tag Out
Rob K. Riley, senior reliability rngineer
Air Liquide America LP, Geismar, La.
Depressure line safely
After the pipeline has been isolated, the section should be blown down using a controlled process, preferably a small isolation valve. If a valve for control is not available, flange bolts should be loosened to allow the gas pressure in the pipe to escape safely. If the pipe is too large or long to allow timely depressurization of the line safely, an adequately sized valve should be installed onto the piping and tapped to allow safe depressurization of the pipeline. Safety is paramount in depressurizing any pipeline and should be performed efficiently before any consideration of time and money.
After the piping work has been repaired and put back into service using a documented repressurization process, all documentation should be signed and dated by the workers. The signed document should be submitted, reviewed and filed for further reference.
Karl Watson, P.E., C.E.M., C.E.P., sr. engineer
Abbott Laboratories, Abbott Park, Ill.
Since there is no mention of any label or signage on the pipes and valves, color-coding with a unique ID would be the logical and least expensive first choice. You could actually use colored tape and apply a strip along the entire length of the pipe. Then, of course, a proper LOTO procedure that incorporates a second check by another qualified tag signer should be used. Another more expensive, and maybe less effective, option would be to relocate the "extra" pipe so that "three from the end" in the center of the room is actually "three from the end" on the wall.
Thomas Hinckley, senior process engineer
Texas Polymer Services Inc., Orange, Texas
Diane Dierking is senior editor for Chemical Processing magazine. E-mail her at firstname.lastname@example.org.