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Can anyone confirm that a "skillet" as mentioned in NFPA 13, 2013 Edition Section A.10.10.2.2.6 is the same thing as a spectacle blind flange?
10.10.2.2.6* Hydrostatic Testing Allowance. Where additional water is added to the system to maintain the test pressures required by 10.10.2.2.1, the amount of water shall be measured and shall not exceed the limits of Table 10.10.2.2.6, which are based upon the following equation... A.10.10.2.2.6 The use of a blind flange or skillet is preferred for use when hydrostatically testing segments of new work. Metal-seated valves are susceptible to developing slight imperfections during transport, installation, and operation and thus can be likely to leak more than 1 fl oz/in. (1.2 mL/mm) of valve diameter per hour. For this reason, the blind flange should be used when hydrostatically testing. Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
3 Comments
9/26/2019 09:43:00 am
Kind of like a square being a rectangle, but not a rectangle being a square, a flange skillet is a more specific definition of a blind flange. Blind flanges are used a-typically in the process industry in order to block fluids within a specific portion of a pipe network. Skillet flanges are blind flanges that due the same thing, but where the difference lies, is that the skillet flange has a paddle neck at for slide in installation between the pipes and subsequent bolting as required to ensure the fluids are entirely blocked. Here are two example youtube videos that should help show more clearly the distinction;
Anon.
9/26/2019 11:19:26 am
I think we called it a frying pan. Maybe a west-coast-thing, haha.
Mark Harris
9/26/2019 05:05:30 pm
To me the skillet or frying pan is a solid round piece of flat steel the diameter of a flange gasket with a handle (or I have also seen two to four handles) to be used to isolate piping between two companion flanges to isolate section of piping typically as noted for a pressure test. The handle or handles are a visual indication that device is still in pipe and needs to be removed after the hydro test. Leave a Reply. |
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