Cashco 5500 User Manual download pdf

INSTALLATION, OPERATION AND MAINTENANCE MANUAL (IOM)

IOM-5500

09-09

SECTION I

I. DESCRIPTION AND SCOPE

Model 5500 Pilot Operated

Pressure Relief Vent

w/ Pipeaway Connection

The maintenance of this Pilot Operated Vent Valve

       

technicians. It is important that the technician be

familiar with the API and corporate standards,

corporate safety policies and the relief vent

manufacturer requirements. When repair services

are performed by an outside company, the company

needs to be a Cashco factory authorized repair

center which specializes in low pressure venting

devices.

Thus the vent valve is capable of operating at

pressures closer to the maximum allowable

working pressure of the tank. Operating at higher

pressures reduces evaporation and total venting

volume, thereby reducing product loss and the cost

of handling emissions.

Each application must be reviewed to ensure ma-

terial compatibility with all metal and soft good

components with the service conditions. The pallet

assembly, wetted components and tubing are 316

-

cied otherwise.

The pilot valve is factory set to comply with the

-

able pressure range is a function of the installed

spring and will be stamped on the metal nameplate.

The set point pressure maybe changed within the

design parameters of the spring while installed on

line or in a maintenance shop. See Section IX

for setting and testing procedures.

This manual is intended to provide recommended

procedures and practices for installation, operation

and maintenance of the Model 5500 POVV. Al-

though this manual cannot cover all possible con-

tingencies, these guidelines will provide safe and

reliable pilot valve performance.

II. VALVE DESIGN AND FUNCTION

The Model 5500 Pilot Operated Vents are used on

liquid storage tanks and other process vessels or

systems to prevent structural damage due to excess

internal pressure. This excess pressure is vented

out through a pipeaway connection.

Storage tanks are pressurized when liquid is

pumped in, compressing the existing vapor or

when increasing temperature causes increased

evaporation or expansion of existing vapor.

       

is pumped out or as atmospheric temperature

decreases. To prevent structural damage, vapor

must be allowed to escape or enter the tank at a

   

dependent on the tank size, displacement rate and



for procedures to determine venting requirements.

A pilot operated relief vent has two principal

advantages over other relief vent designs:

1. Bubble tight shutoff up to 100% of set point.

 

within 10% above set point.

SECTION II

For information on repair centers in your area, please

contact:

Valve Concepts, Inc.

%Cashco, Inc.

607 West 15

Street

Ellsworth, KS 67439-0006





1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - Model 5500 Pilot Operated

INSTALLATION, OPERATION AND MAINTENANCE MANUAL (IOM)IOM-550009-09SECTION II. DESCRIPTION AND SCOPEModel 5500 Pilot OperatedPressure Relief Ventw/ Pipe

Page 2 - SECTION IV

10IOM-5500 MODEL 5000 PILOT VALVEITEM NO. DESCRIPTION Repair Part ITEM NO. DESCRIPTION Repair Part Body  Retaining Screw Upper Diaphragm Case

Page 3 - SECTION V

11IOM-5500ITEM NO.DESCRIPTION Repair Part ITEM NO. DESCRIPTION Repair Part1Body 38 Adapter Bolt3 Seat Ring 39 Adapter Lock Washer4 Pallet 40 Support P

Page 4 - WARNING

Valve Concepts, Inc./ Cashco, Inc. 607 W. 15th StreetEllsworth, KS 67439 www.cashco.comemail: [email protected]

Page 5

IOM-5500 CAUTIONDO NOT attempt to remove the vent from the tank or the system. ALTE

Page 6 - VII. VENT VALVE MAINTENANCE:

3IOM-5500SECTION VV. INSTALLATION:The Model 5500 POVV is a precision device that must be handled carefully to ensure seat tightness. WARNING

Page 7

4IOM-5500 SECTION VIVI. PILOT MAINTENANCE:A. General:1. Maintenance procedures herein after are based upon removal of the pilot/vent valve unit from

Page 8 - CAUTION

5IOM-55009. Install another new diaphragm () on piston stud () and align the bolt holes with parts of previous Steps 6 and 7.10. Stack the upp

Page 9 - TESTING PROCEDURE FOR PILOT:

6IOM-5500 SECTION VIIVII. VENT VALVE MAINTENANCE:A. General:1. The Model 5500 POVV does not require      shou

Page 10 - MODEL 5000 PILOT VALVE

7IOM-5500 d. Straighten the bent ends of cotter pin       (40). Slide pallet (4) assembly out of tube end.

Page 11 - MODEL 5500 RELIEF VENT

8IOM-5500 SECTION VIIIContact your local Cashco, Inc., Sales Representa-tive with the Serial Number and Product code. With this

Page 12

9IOM-5500SECTION IXPilot Valve Test StandIX. PRESSURE CALIBRATION ANDTESTING PROCEDURE FOR PILOT:1. To determine set pressure, slowly increase the pi

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