B-144-12-E
18
9.6 Piping Instructions and Operating Precautions of Jacketed Meters
◆
Hot water or steam jacketed meters require piping work in the following manner:
(1) Piping to the meter body remains the same as that of standard meters (meters not jacketed).
(2) Adhere to the following instructions for the piping to the jacket:
Steam Jacketed
Basically, the piping should be so arranged that
steam flows from the top and leaves from the
bottom. Provide steam traps at outlet ports (see
figure below).
Hot-water Jacketed
Basically, the piping should be so arranged that
hot water flows from the bottom and leaves from
the top (see figure below).
(3) Although the measuring chamber is heat
treated, due consideration should be taken
not to give piping elongation or contraction by
sharp temperature changes or pipe strains.
Progressive heating is suggested at least four
hours before commencing service operation.
(4) As for outline dimensions and tubing connec-
tion dimensions, see approval drawings.
(5) If heat tracing is desired, considerations
should be taken to facilitate maintenance and
servicing.
Make sure, if it is the case, that there is no
liquid leaks when related components are
covered with lagging material.
(6) Lagging should be so provided that the top
cover of strainer is easily accessible. Also it is
necessary that the strainer net be cleaned on
a regular basis.
(7) Never attempt to lag radiator fins. Lagging
them will cause excessive heat buildup in the
register and pulse generator, possibly leading
to costly downtime.
NOTE:
As for outline dimensions and tube connection dimensions, see approval drawing.
Flow
Direction
Hot Water IN
OUT
Hot Water Jacketed Type, Horizontal Run
Flow
Direction
Steam IN
OUT
Steam Jacketed Type, Horizontal Run
