B-149-4N-E
15
CAUTION
9.5 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 ows in from the top and out 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 ows in from the top and out from the top (see
gure 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 connection 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 ns.
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.
STEAM IN
OUT
FLOW
DIRECTION
Steam Jacketed Type, Horizontal Run
IN
OUT
FLOW
DIRECTION
HOT WATER
Hot Water Jacketed Type, Horizontal Run
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