Cashco HP-1+6+S User Manual

Model hp-1+6+s, High pressure differential reducing reg u la tor

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INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)

IOM-HP-S-

DIFF

12-13

MODEL HP-1+6+S

HIGH PRESSURE DIFFERENTIAL

REDUCING REG U LA TOR

I. DESCRIPTION AND SCOPE

The Model HP-1+6+S is a heavy duty, high pres-
sure differential reducing regulator used to control
differential pressure between downstream outlet (P

2

)

pressure and a loading (P

LOAD

) pressure to the spring

chamber. This unit applies to Cashco drawing nos.
32911 (Non-NACE construction), 32909 (CS NACE
construction), or 32907 (SST NACE construction).
Sizes are 1/2", 3/4", and 1-1/2" (DN15, 20, and 40).

II. INSTALLATION

This unit was designed and is used almost exclusively on compressor and turbo ex pand er seal gas systems. REFER
TO COM PRES SOR / EX PAND ER MAN U FAC TUR ER'S MAN U AL FOR DETAILED IN STAL LA TION, START-UP
AND SHUTDOWN OF THIS UNIT.
Install regulator in ac cor dance with direction of fl ow arrow cast on body (1).

SECTION III

III. PRINCIPLE OF OPERATION

1. The HP-1+6+S is used to main tain a con stant

differential pressure across the seals of a
com pres sor/expander. A dif fer en tial pres sure re-
duc ing reg u la tor senses the down stream or outlet
(P

2

) pres sure on the lower side of the diaphragm

and is opposed by the force of the range spring
plus an ad di tion al loading (P

LOAD

) pressure con-

nect ed to the spring cham ber. The loading (P

LOAD

)

pres sure plus the range spring (14) setting (P

SET

)

equals the outlet (P

2

) pres sure of the reg u la tor.

The range spring setting (P

SET

) is the differential

setting.

SECTION II

HP-1+6+S

DIFFERENTIAL SCHEMATIC

SECTION I

CAUTION A

NOT FOR STEAM SERVICE. NOT FOR OXYGEN SERVICE.

CAUTION

For welded installations, all internal trim parts, seals and
diaphragm(s) must be removed from reg u la tor body prior to
welding into pipeline. The heat of fusion welding will dam-
age non-metallic parts if not re moved. NOTE: This does
not apply to units equipped with extended pipe nip ples.

CAUTION

Installation of adequate overpressure pro tec tion is recom-
mended to pro tect the reg u la tor from overpressure and
all down stream equip ment from damage in the event of
regulator failure.

CAUTION

Option-1+6 contains single di a phragm con struc tion. In
the event of diaphragm fail ure, the process fl u id will mix
with the load ing fl uid. Please alert your rep re sen ta tive so
an al ter na tive product can be se lect ed.

This unit is most commonly applied to develop a con-
stant differential pressure across a rotating shaft seal
to provide proper sealing and lubricating conditions
over varying pressure ranges. Refer to Tech ni cal
Bulletin HP-S-DIFF-TB for design con di tions and
se lec tion rec om men da tions.

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