In these applications, PEEK is a better material choice for temperatures of 400 F to 500 F. While PTFE is the standard choice for temperatures up to 400 F, some processes exceed 400 F in the stuffing box. PTFE is compliant with United States Food and Drug Administration regulations and has broad chemical resistance. It can withstand a wide temperature range (-300 F to 500 F), which few other materials handle well. PTFE is a standard material for lantern rings. The ideal materials are primarily polytetrafluoroethylene (PTFE) or polyether ether ketone (PEEK). Looking back historically, lantern rings have been constructed of many different materials, including brass, other metals and low-quality plastics. Below are some strengths and weaknesses of PTFE and PEEK. Lantern ring selection should be given equal consideration because they are equally as important as packing. Selecting the ideal material for the application is critical.
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So, how do we protect this notorious leakage path and increase stuffing box, and ultimately pump, reliability? While packing selection and proper installation are key, install the lantern ring incorrectly or allow it to be blocked, and failure is imminent. The stuffing box is where it all happens and also ripe with potential failure possibilities. However, the fluid containment, shaft movement, shaft sealing and motor connection (as well as potential contamination points-lubrication into the process fluid/process fluid into the lubrication) all occur within this small but important space.
Of course, he blames Hamilton for keeping him out.ĭo you ever wish you could see inside the stuffing box, which is the space where most of the activity happens within a pump? Sure, the intake, impeller and casing get a lot of attention.
In the Tony-Award-winning musical Hamilton, one of the most impactful scenes is when Aaron Burr laments that he never gets to be “in the room where it (decision-making) happens.” What goes on in that room full of leaders is so great, and he yearns to be there.
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