• enquiry@nashseal.com
  • +44 (0) 1204 388 030
  • Services
    • Turbomachinery
    • Pump Seals
    • Mixer Seals
    • Performance
    • Consultancy
  • Sectors
    • Oil & Gas
    • Power Generation
    • Pharmaceutical
    • Coatings & Inks
    • Chemical
  • Partnership Programme
  • Case Studies
  • Blog
  • FAQs
  • About
    • Any Brand
    • Company History
    • Company Vision
    • Our People
    • Global Reach
  • Contact
  • .
Menu
  • Services
    • Turbomachinery
    • Pump Seals
    • Mixer Seals
    • Performance
    • Consultancy
  • Sectors
    • Oil & Gas
    • Power Generation
    • Pharmaceutical
    • Coatings & Inks
    • Chemical
  • Partnership Programme
  • Case Studies
  • Blog
  • FAQs
  • About
    • Any Brand
    • Company History
    • Company Vision
    • Our People
    • Global Reach
  • Contact
  • .

Home   |   Case Studies   |   Rapid repair of essential feed pump back-up seals

  • Any Brand
  • Oil & Gas
  • Power Generation
  • Pharmaceutical
  • Coatings & Inks
  • Chemical
Menu
  • Any Brand
  • Oil & Gas
  • Power Generation
  • Pharmaceutical
  • Coatings & Inks
  • Chemical

Rapid repair of essential feed pump back-up seals

Extensive mechanical seal face and o-ring damage linked to high ferric oxide concentrations in power station feed water was repaired within a European client’s tight cost and time expectations.

Client challenge

Following the failure of boiler feed water pump mechanical seals – thought to be caused by a combination of incorrect o-ring specifications from a different vendor and ferric oxide deposits in service – a major European power station was forced to rely on its spare seal set. Restoring the damaged seals became an urgent priority.

Rather than go back to the seal OEM, our client – a pump service specialist – asked NASH to examine and repair the damaged seals so they could return them to their customer’s site as quickly as possible to minimise plant vulnerability.

Our response

A GA drawing and duty conditions were available. It was also confirmed that the seals had run hot prior to their removal. NASH analysed the damage and generated detailed Inspection Reports.

These showed: –

  • Heavy wear on the stationary seal rings, with chips to inside and outside face edges
  • Heavy fretting on the sliding diameters of the stationary seal ring carriers
  • Heavy wear on the inside diameters of the associated dynamic o-rings
  • Heavy wear to the faces of both rotary seal rings
  • Seal plate safety bushes were also worn and loose
  • Importantly, both seals were contaminated with ferric oxide (magnetite) deposits

We concluded that the root cause of seal failure was a combination of incorrect o-ring specifications and a build-up of ferric oxide particles and deposits in the pump system.

Work scope: –

  • New rotary and stationary seal rings supplied and fitted
  • Sliding diameters of both stationary carriers recoated with tungsten carbide
  • New springs, fasteners and elastomers to correct specification supplied and fitted

Recommendations: –

The NASH team also advised that to prevent any recurring damage: –

  • Associated equipment and line work should be inspected and cleaned to remove all ferric oxide build-up

Benefits

NASH was able to: –

  • Restore the seals to original specification
  • Ensure further premature seal failures and consequent unplanned outages were eliminated
  • Meet both the client’s and the client customer’s tight lead time expectations
  • Provide a more cost-competitive service than the seal OEM
Browse our case studies

Free Download

5 factors rotating equipment users consider when reviewing mechanical seal performance.

Download our free White Paper

*Required fields

  • enquiry@nashseal.com
  • +44 (0) 1204 388 030
  • NASH Mechanical Seal Services Ltd, Nile Street, Bolton, Lancashire, BL3 6DW, England
    Company Registration Number: 01803027

Despite efforts, most #engineering students are still predominantly white males, as the sector…

About 6 days ago from NASH's Twitter

Spring Budget 2023: What are #engineering experts saying? dpaonthenet.net/article/19644… via @DPAONTHENET…

About 6 days ago from NASH's Twitter

As part of National Careers Week, @_EngineeringUK has launched a new careers resource designed to…

About 2 weeks ago from NASH's Twitter

The current gender pay gap within the manufacturing industry won’t come to an end until 2085, …

About 2 weeks ago from NASH's Twitter

Manufacturers looking at spending plans for 2023 should weigh up the technologies most likely to…

Last month from NASH's Twitter

Follow @nashseal