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I. DESCRIPTION AND SCOPE
The Model HP-1+6+S is a heavy duty, high pressure
differential reducing regulator used to control
differential pressure between downstream outlet (P
pressure and a loading (P
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
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 flow arrow cast on body (1).
Option-1+6 contains single di a phragm con struc tion. In
the event of diaphragm fail ure, the process flu id will mix
with the load ing fluid. Please alert your rep re sen ta tive so
an al ter na tive product can be se lect ed.
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
) pres sure on the lower side of the
2
diaphragm and is opposed by the force of the
range spring plus an ad di tion al loading (P
pressure con nect ed to the spring cham ber. The
loading (P
) pres sure plus the range spring
LOAD
(14) setting (P
SET
of the reg u la tor. The range spring setting (P
the differential setting.
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
MODEL HP-1+6+S
HIGH PRESSURE DIFFERENTIAL
REDUCING REG U LA TOR
) pressure to the spring
LOAD
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.
) equals the outlet (P
) pres sure
2
SECTION I
40). This unit is most commonly applied to develop
a constant differential pressure across a rotating
shaft seal to provide proper sealing and lubricating
conditions over varying pressure ranges.
)
to Tech ni cal Bulletin HP-S-DIFF-TB for design
2
con di tions and se lec tion rec om men da tions.
NOT FOR STEAM SERVICE. NOT FOR OXYGEN SERVICE.
SECTION II
Installation of adequate overpressure pro tec tion is
recommended 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
SECTION III
)
LOAD
) is
SET
CAUTION
CAUTION
HP-1+6+S
DIFFERENTIAL SCHEMATIC
IOM-HP-S-
DIFF
12-16
Refer
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Related Manuals for cashco HP-1+6+S
Summary of Contents for cashco HP-1+6+S
- Page 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...
- Page 2 2. A complete diaphragm failure will cause the CAUTION reg u la tor to fail open. Limit any field hydrostatic test to 1-1/2 times the Maximum Outlet and Spring Chamber Pressure Rat ing (See Ta ble 2 in HP-S-DIFF TB). En sure that the test pressure is applied uni form ly to the body inlet, body outlet, and spring chamber.
-
Page 3: Maintenance
ASTM A-194, Grade 2H. New body flange hardware (9,23,34,35) may be pur chased 2. Owner should refer to owner's procedures for from Cashco, Inc. or through the OEM. removal, handling, cleaning and dis pos al of nonreusable parts, i.e. gaskets, etc. - Page 4 c. Lubricate adjusting screw (6) threads. spacer (24). Thread on lower nuts (9) and Carefully re in stall the adjusting screw (6) tighten by hand. Adjust length of studs (34,35) up into the spring cham ber (2) by ro tat ing by using the top nut (9) so that there are at least the ad just ing screw (6) CW until top of 3 to 4 threads protruding from the lower nut.
- Page 5 (16). Do not use a “homemade” cylinder gas ket. Pipe seal ant may be lightly coated to Figure 2: Recommended Bench Test Piping Schematic for HP-1+6+S the gasket (18) surfaces prior to installation. VI-B., steps 1-5. In spect to see that cylinder gasket (18) is d.
-
Page 6: Troubleshooting Guide
SECTION VII VII. TROUBLE SHOOTING GUIDE 1. Erratic operation; chattering. Possible Cause Remedy Oversized regulator; inadequate rangeability. Check actual flow conditions, resize regulator for minimum and maximum flow. Increase flow rate. Decrease regulator pressure drop; decrease inlet pressure by placing a throttling orifice in inlet piping union. -
Page 7: Section Viii
Cashco, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Cashco, Inc. product remains solely with the purchaser. - Page 8 31 32 Seal Welded per ASME BPVC Code Section IX 1/2" (DN15) female NPT Loading Connection. 34 35 SEAT 26 27 FIGURE 3 Model HP-1+6+S Repair Repair Item No. Description Parts Item No. Description Parts Piston w/ TFE Seat Body...
- Page 9 ATEX requires that all components and equipment be evaluated. Cashco pressure regulators are considered components. Based on the ATEX Directive, Cashco considers the location where the pressure regulators are installed to be classified Equipment-group II, Category 3 because flammable gases would only be present for a short period of time in the event of a leak.
- Page 10 If the above issues are addressed by selecting options that do not have potential sources of ignition, avoiding options that have not been assessed, and by taking the proper usage issue precautions, then Cashco regulators can be considered to be a mechanical device that does not have its own source of ignition and thus falls outside the scope of the ATEX directive.
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