Cashco 1000 HP Differential - Manual

INSTALLATION, OPERATION & MAINTENANCE MANUAL IOM-1000HP-
Differential
12-13
MODEL 1000HP - DIFFERENTIAL
SECTION I
I. DESCRIPTION AND SCOPE
The Model 1000HP-1+6 and 1000HP-1+8 are dif fer en tial pressure reducing regulators used to control dif fer en tial
pressure between downstream (outlet or P
2
) pressure and a loading (P
Load
) pressure to the spring chamber. Sizes
are 1/2" , 3/4", 1", 1-1/4", 1-1/2" and 2" (DN15, 20, 25, 32, 40 and 50). With proper trim uti li za tion and jet selection,
this unit is suitable for liquid, gaseous, or steam service. Refer to Technical Bulletin 1000HP-DIFF-TB for sizing,
application and selection rec om men da tions.
SECTION II
II. INSTALLATION
1. An inlet block valve should always be installed.
An outlet block valve is desirable.
2. A manual bypass valve is recommended for “hot
piping” systems to assist in piping warm-up at
startup.
3. An isolation valve on the loading line is not rec om -
mend ed. The annular body ring of the 1000HP-1+8
may be piped to a safe drainage point, but no valve
should be installed in the drain line.
4. Pipe unions must be installed to allow removal
from piping. Trim can only be changed by unit
removal from pipeline. If fl anges are utilized, a
lap joint fl ange is required on the inlet end of the
regulator to help align bolt holes as the cylinder
screws into place. NOTE: Cashco does not rec-
om mend fi eld welding on the cylinder (inlet) end
of the valve due to the possibility of warpage.
CAUTION
Recommended Piping Schematic for
Differential Pressure Reducing Station
DO NOT HYDROSTATIC TEST THROUGH AN IN-
STALLED UNIT; ISOLATE FROM TEST. DO NOT
HY DRO STAT IC TEST THE LOADING PRESSURE
WITH OUT PRESSURE IN THE MAIN REGULATOR.
The name plate indicated outlet pressure rating, if
reached, may cause internal damage. Refer to Tech ni cal
Bulletin Model 1000HP-DIFF-TB, Table 3 for “emer gen cy
overpressure level” that will not do irrepairable internals
damage. In addition, note on the name plate that the
Inlet and Outlet pressure and tem per a ture ratings are
at different levels.
5. An outlet pressure gauge should be located ap-
prox i mate ly ten pipe diameters downstream, and
within sight. A loading pressure (or differential
pressure) gauge is rec om mend ed.
6. All installations should include a downstream re-
lief device if the inlet pressure could exceed the
pressure rating of any downstream equipment or
the maximum outlet pressure rating of the unit.
7. Clean the piping of all foreign material including
chips, welding scale, oil, grease and dirt before
in stall ing the regulator. Strainers are rec om -
mend ed.
8. In placing thread sealant on pipe ends prior to
en gage ment, ensure that excess material is
re moved and not allowed to enter the regulator
upon startup.
9. Flow Direction: Install so the fl ow direction match es
the arrow cast on the body.
PI
SRV
Outlet
@ P
2 Supply
@ P
1
(Shaded portion for steam/condensate systems)
Model 1000HP-1+6
Differential
Bypass
Blowdown-Drain Blowdown-Drain
PI