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Furmanite

Trevitest on-line valve testing under pressure

Hot Testing of valves while operations continue. Cold Testing of

valves on-site and in the workshop. Trevitest will increase

efficiency and save your organisation money from day one.

In the past, valve testing revolved around,workshops and most importantly shuttingdown the line. The whole process was bothtime consuming and costly - but there is analternative.

With Trevitest you can carry out accurate

assessments of safety and relief valves insitu and under pressure - Hot Testing.There’s also the option of Cold Testing toassess the performance of new and existingvalves.

Developed and patented world-wide byFurmanite, Trevitest is fast, safe andefficient. Operated in accordance with strictcontrol procedures centred on ISO 9001,Trevitest can be used with most safety andrelief valves manufactured for use in steam,air, gas process and water systems. These

include conventional spring type valves,torsion bar valves and pilot operated valves.

Serving every sector 

Fossil, hydro and nuclear powergeneration

Offshore oil and gas production

Refineries and petrochemical plants

Fertiliser plants Food Processing plants

Pulp and paper plants

How does Trevitest work? 

Here’s the basic principle. A force is appliedto the valve spindle to overcome the springtension of the valve. This is achieved usinga hydraulic power jack linked to anelectronic force transducer. A computer isthen used to measure the force applied. Bycombining this data with information on

the valve seat and line pressure of the valveit is possible to assess the set pressure.

Cost effective safety 

and relief valve 

testing eliminates the 

need for shutdown 

Furmanite Secures Ten YearTesting Contract 

The challenge was straightforward. Thetesting of eight, 6’’ x 10” Farris ReliefValves located on vessels containing 202tonnes of liquid petroleum gas (propane)at the British gas Llandarcy plant in SouthWales. In the past the testing of eachvalve would take 3-4 days. With Trevitestall eight were fully tested in just 16 hourswithout any interruption to the plant.

Testing Times 

The success of this initial project hasconvinced British Gas to adopt theTrevitest System as part of its ten-yearworkshop and overhaul procedure.A “fingerprint” will be taken of each valvein the workshop and this will then betested in situ to assess the need for valveoverhaul.

Worldwide Approvals 

Trevitest is widely accepted by safetyauthorities and industrial insurancecompanies in all the key areas ofoperation including ASME and NationalBoard in the USA, the HSE and LloydsIndustrial Services in the UK and the TUVin Germany. In addition approvals for theTrevitest have been given by many wellknown companies in the oil,petrochemical, fertilizer, powergeneration and other process industries.

Case Study

Hydraulic Actuator 

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Furmanite International Limited

Furman House, Shap Road, Kendal, Cumbria.United Kingdom LA9 6RUTel: +44 (0) 1539 729009

Fax: +44 (0) 1539 729359

E-mail: sales@furmanite.co.uk

Web: www.furmanite.com www.furmanite.com

Hot Testing – measuredunder pressure 

With Trevitest Hot Testing you get a datemarked certified print out of valve setpressure and the line pressure at the valve.From this information the set pressure,spring adjustment and displacement of the

valve can be determined. Trevitest alsogives an indication of the effect of thenozzle ring, guide ring and reseat pressure.

Major applications include:

Steam Service Valves: Test safety andreheater valves at normal operatingpressure without the need for increasedboiler pressure

Clean Process Valves: Diagnose safetyand relief valves that requiremaintenance while the plant is running

normally prior to scheduledshutdowns.

Nuclear Valves: Test safety valves onthe secondary side, main steam safetyvalves and safety valves on theprimary side plus CO2 valves andpressuriser valves.

The advantages of Hot Testing 

No interruption to plant productionduring testing

Reduced time needed to commissionthe plant after shutdown

Reduced fuel costs with no need toraise system pressure.

Only valves that require an overhaulneed to be removed from the line

Welded-in valves can be adjustedwithout costly removal from the line

Multiple tests and resettings of valveswithin a short timescale

No need for temperature compensationto set pressure.

Cold Testing – a cool assessment 

With Trevitest Cold Testing you candetermine the set pressure, spring rate and

valve displacement.Major applications include:

Pre-commissioning safety and relief valves on new plant.

Workshop testing following theconventional bench test to give thevalve a “fingerprint”. This can beverified once the valve is on-site

The advantages of Cold Testing 

Eliminate the cost of removing valvesfrom their location prior tocommissioning new plant

Only valves requiring overhaul areremoved from the line - reducing plantdowntime.

Correct spline alignment of torsion barsafety valves saves unplannedshutdown.

Case Study

Pre-commissioning Assistance for Sizewell “B” Nuclear Power Station 

Following an extensive series of trials,the outstanding performance of Trevitestconvinced Nuclear Electric to use thesystem in the Pre-commissioning ofSizewell “B”. The tests on bothpressuriser safety valves and mainsteam safety valves produced resultsthat were always better than +/- 1%.

Testing Timescales 

The Furmanite team, working closelywith Nuclear Electric, had a tighttimeframe to test the first twenty mainsteam safety valves. Two teams working

twelve-hour shifts back to backcommenced testing on Thursdayafternoon and had completed the wholejob by Friday.

Copyright © 2004 Furmanite, Inc. All rights reserved. The

Furmanite logo, Maximising Asset Uptime is a registeredservice mark of Furmanite, Inc. All other trademarks, service

marks, registered trademarks, or registered service marks

mentioned in this document are the property of theirrespective owners.

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Trevitest Equipment 

Testing a Torsion Bar Relief Valve