Emerson Process Management 5300 manual Mounting a Centering Disc for Pipe Installations

Reference Manual

00809-0100-4530, Rev BA July 2009

Rosemount 5300 Series

Mounting a Centering Disc for Pipe Installations

Table 3-7. Choose the right centering disc diameter for a particular Pipe Schedule.

Table 3-8. Outer diameter for discs according to disc size.

To prevent the probe from contacting the bridle wall when replacing displacers or installing in pipes, centering discs are available for rigid single, flexible single, and flexible twin lead probes. The disc is attached to the end of the probe and thus keeps the probe centered in the bridle. The discs are made of stainless steel, Alloy C-276, or PTFE.

When mounting a centering disc, it is important that it fits correctly in the pipe. See Table 3-7for the appropriate disc diameters.

			Pipe Schedule
Pipe Size	5s,5	10s,10	40s,40	80s,80	120	160
2 in.	2 in.	2 in.	2 in.	2 in.	NA(1)	NA(2)
3 in.	3 in.	3 in.	3 in.	3 in.	NA(1)	2 in.
4 in.	4 in.	4 in.	4 in.	4 in.	4 in.	3 in.
5 in.	4 in.	4 in.	4 in.	4 in.	4 in.	4 in.
6 in.	6 in.	6 in.	6 in.	6 in.	4 in.	4 in.
7 in.	NA(1)	NA(1)	6 in.	6 in.	NA(1)	NA(1)
8 in.	8 in.	8 in.	8 in.	8 in.	6 in.	6 in.

(1)Schedule is not available for pipe size.

(2)No centering disc is available.

This table shows the actual outer diameter for discs.

Disc Size	Actual Disc Diameter
2 in.	1.8 in. (45 mm)
3 in.	2.7 in. (68 mm)
4 in.	3.6 in. (92 mm)
6 in.	5.55 in. (141 mm)
8 in.	7.4 in. (188 mm)

Mounting a Centering Disc on Flexible Single Probes

Centering disc	1.	Mount the centering disc at the
		end of the weight.
	2.	Make sure that the tab washer
Tab washer		is properly inserted in the
	Weight	centering disc.
	3.	Fasten the centering disc with
		the bolt.
Bolt
	4.	Secure the bolt by folding the
Tab washer		tab washer.

NOTE!

When using centering discs made of PTFE, note that the maximum temperature is 392 °F (200 °C).

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