2.2

Piping

Figure 3 shows a typical piping installation of a Model B40

in a pipeline to a pressure vessel. Reference lines, on float

chamber, should be aligned to correspond with liquid level

in the vessel at which switch control is desired (refer to

dimensional drawing, if furnished). Use pipe of sufficient

strength to support the unit. If necessary, provide a stand

or hanger to help support its weight. All piping should be

straight and free of low spots or pockets so that the lower

liquid line will drain towards the vessel and the upper vapor

line will drain towards the control. Pipeline should be insulat-

ed, as shown, to minimize loss of liquid temperature and

further control of the heat in the area of the switch housing.

DO NOT insulate switch housing or float chamber.

NOTE: Manufacturer recommends that when welding chrome-moly

steel piping, the procedures used conform to AWS-D10.8-61.

Caution: DO NOT INSULATE SWITCH MECHANISM HOUSING.

2.3

Mounting

Caution: This instrument is intended for use in Installation Category

II,

Pollution Degree 2 locations.

Before welding, adjust piping to bring control to a vertical

position. B40 level controls require that the enclosing tube

be mounted within three degrees of vertical in all directions.

A three degree slant is noticeable by eye, but installation

should be checked using a spirit level.

5

46-602 B40 Liquid Level Switches

Rising Level

Falling Level

Pressure equalizing line

to pressure vessel

Liquid equalizing line to pressure vessel must be

vertical to within three degrees

Do not insulate

chamber, fins, or

switch housing

Inlet line

to chamber

Vent line

from chamber

Conduit connection

to switch shousing

Reference lines for

switch actuating levels

1" schedule 80

beveled in-line

weld nipples

for attaching

control to

system (typical)

Figure 3