Emerson Crosby JOS-E Series User Manual

WARNING
Suitability of the material and product for
the use contemplated by the buyer is the
sole responsibility of the buyer. Also storage,
installation and proper use and application
are the sole responsibility of the purchaser.
Emersondisclaims any and all liability arising out
of the same.
Any installation, maintenance, adjustment,
repair and testing performed on pressure
relief valves should be done in accordance with
the requirements of all applicable codes and
standards under which those performing such
work should maintain proper authorization
through appropriate governing authorities.
No repair, assembly and test work done by
other than Emerson shall be covered by the
warranty extended by Emerson to its customers.
You assume full responsibility for your work. In
maintaining and repairing Crosby products you
should use only parts manufactured by Emerson.
Call your nearest Emerson regional sales office or
representative for a service engineer should you
wish assistance with your field needs.
TABLE OF CONTENTS
1 Introduction ................................................... 4
2 Storage and handling .................................... 4
3 Installation ..................................................... 4
4 Hydrostatic pressure tests ........................... 5
5 Setting, testing and adjustments ................. 6
6 Valve maintenance ...................................... 10
7 Style variations ............................................ 21
8 Service records ............................................ 21
9 Spare parts .................................................. 21
10 Trouble shooting pressure relief valves .... 21
11 Emerson’ field servicesandrepair
programs ..................................................... 22
ATTENTION
The safety of lives and property often depends on
the proper operation of the pressure relief valves.
Consequently, the valves should be kept clean and
should be tested and reconditioned periodically to
make sure they function properly.
Emerson.com/FinalControl
CROSBY STYLE JOS-E, JBS-E, JLT*-JBS-E, JLT*-JOS-E VALVES
InstallatIon and MaIntenance InstructIons
© 2017 Emerson. All Rights Reserved. VCIOM-06208-EN 18/02
Engineering Doc. #IS-V3137B
Before installation these instructions must be read fully and understood

Emerson Crosby JOS-E Series Specifications

General

Brand	Emerson
Model	Crosby JOS-E Series
Category	Control Unit
Language	English

Summary

3 INSTALLATION

3.1 Care in handling

Handle pressure relief valves carefully to prevent damage and ensure proper operation.

4 HYDROSTATIC PRESSURE TESTS

4.1 Hydrostatic test of vessel or system

Recommended to remove valve. If in place, use test gag carefully to avoid valve damage.

5 SETTING, TESTING AND ADJUSTMENTS

5.1 New valves

5.7 Set pressure changes

Changes beyond spring range require new spring assembly and restamping.

5.8 Set pressure adjustment

Adjust set pressure using adjusting bolt. Reduce pressure before adjustment to prevent seat damage.

5.9 Nozzle ring settings

Adjust nozzle ring for blowdown and simmer. Seldom necessary in field.

5.10 Cold differential test pressure adjustments

Adjust test pressure for temperature and back pressure to match actual service conditions.

5.11 Seat leakage tests

Tests seat tightness using API standard 527. Defines acceptable leakage rates for metal/soft seats.

6 VALVE MAINTENANCE

6.1 Visual inspection and neutralizing

Visually inspect valves for deposits or corrosion. Neutralize hazardous materials before disassembly.

6.2 Disassembly

6.4 Inspection

6.5 Reconditioning of valve seats

Lap seating surfaces to restore original condition. Machine if damage is too severe.

6.6 Assembly

Assemble components cleanly, lubricating threads and surfaces. Follow specific steps for each part.

6.7 Restricted lift valves

Details on restricted lift versions, including spacer selection and lift measurement.

10 TROUBLE SHOOTING PRESSURE RELIEF VALVES

10.1 Seat leakage

Discusses common issue of seat leakage, its causes, and detrimental effects.

10.1.2 Distortion from piping strains

10.1.3 Operating pressure too close to set pressure

10.1.4 Chatter

10.1.7 Corrosion

11 EMERSON FIELD SERVICE AND REPAIR PROGRAMS