I’d like to ask everyone: how is the number of dynamic sealing points in mechanical equipment counted?
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This post was last edited by 156026692 on 2019-3-7 at 10:50. Hello everyone: I would like to ask for some advice. In order to prepare for an inspection, we need to complete a ledger table of the device’s sealing points. Regarding the counting of dynamic sealing points, my colleagues have different opinions on this. I’ve also searched on forums; some say that a typical pump has five dynamic sealing points (one bearing at each end of the motor, one seal for the rotating and stationary rings, and one at the pump body), while others suggest counting them based on their location codes. The authorities also have no clear statements or regulations on this matter; in short, in order to meet inspection requirements, they just play numerical games and create confusion. I’m posting this question: everyone, what criteria are used to count the dynamic sealing points for rotating equipment such as pumps and turbines in installations? Thank you!
According to what you said, I think a single-stage pump should have a total of 5 seal components: 2 for the bearings at the front and back of the motor, 2 for the bearings at the front and back of the pump’s bearing housing, and 1 for the shaft seal of the single-stage pump (2 if it’s a double-face seal); for double-suction or multi-stage pumps with dual support structures, the number of shaft seals is multiplied by 2
Personal definition: A location where there is relative motion between two mating or clearance parts, and where both parts need to be sealed to prevent leakage, is called a dynamic sealing point
Since there are many types of moving equipment, such as reciprocating machines with four cylinders, some say that there are 4 sealing points per cylinder, while others claim it’s 8 or so. Other shielded pumps, reciprocating pumps and the like – just thinking about having to keep track of these things is annoying
Haha, once this stuff is categorized and counted, there’s no need to count it again
In principle, any place where leakage can occur is considered a leakage point.
At a glance, it’s clear that the original poster has confused dynamic sealing with mechanical sealing; pumps use mechanical sealing. The definition is as follows: A point where there is relative motion between two mating or clearance parts, and where both parts need to be sealed to prevent leakage, is called a dynamic sealing point