npra presentation

2007 Reliability & Maintenance Conference

Technical Session: RMC-07-088

High Pressure Heat Exchanger Diaphragm Removal/Retrofit Using Double Tapered Pressure SealJames R. “Chezo” Cesarini, PEVice PresidentPetroSpect Management Services, Ltd.Texas City, Texas


Problem

• Bullet Points– Bullet Points

Bullet Points


Why Cracks Occur


Criticality


Solution


Initial Concerns

• What are the risks?

• What applications had used this sealing technology?

• Could we predict the performance of the seal in this application?


Proven Technology –New Application

[j1]

2010


Similar Applications

Brown Fin-tubeHairpin Turn Heat Exchanger

Flanges

Industrial Applications

Pressures up to 40,000 psi

Temperatures: -350F – 1600F


Third Party FEA Analysis


JP Kenny Comparison


Opportunity

Rita (2005)


Retrofit Process

Machine Seal Pocket with ID Mounted Tool

Seal Ring Installation Cover plate installation Stud Tensioning


Design ComparisonDesign ComparisonOpportunity Cost NotOpportunity Cost Not--WithstandingWithstanding


Project Risk Mitigation

If any unforeseen problem became evident:The exchanger could go back together with the original diaphragm plate.


Summary• Eliminated reoccurrence of cracked diaphragm

welds• Significant decrease in complexity – True KISS

Design• Significant Reduction in Turnaround Time

– Maintenance Cost Savings & Maintenance Friendly (Small tools)

– Opportunity Cost Savings• No Hot Bolting – Using Multi-jack bolt tensioners• Seal has worked flawlessly


Questions

James R. “Chezo’ Cesarini, PEVice PresidentPetroSpect Management Services, [email protected]

Erik Howard Vice President, Engineering & Sales

Taper-Lok Corporation [email protected]

npra presentation

Documents

chezo cesarini

original diaphragm plate

unforeseen problem

sealing technology

hot bolting

howard vice president

texas city