View the video on the advantages of our custom fitting of packing and seals. For additional information call MD&A’s On-site Seal Services today at (518) 399-3616 or use our Contact form.

Why Packing & Seal Installation is So Critical
Turbine seals prevent steam from leaking between the rotating and stationary components. Having excessive clearance due to either component distortion or through seal wear reduces turbine efficiency. Having clearances that are too tight, will result in turbine rubs and operational problems.

Installation of packing rings and seals by experienced turbine technicians is a key part of your outage. Skilled technicians can custom machine your replacement seals to best fit distorted components and establish proper seal clearances. Having the proper tooling and skills enables MD&A to perform this work efficiently and with great precision.

The most common distortions are:

• Elliptical Bore Distortion- Turbine Diaphragms, Blade Rings, and glands cases frequently become elliptical after years of service. This changes seal radial clearances, resulting in seal rubs and subsequent wear and increased seal clearances. Decreased sealing efficiency, decreases turbine efficiency and output. Using the distorted component dimensions, our technicians and Engineers design and manufacture the replacement seals to better accommodate the distortion. Our Seal technicians provide the final adjustment to accommodate the uneven distortion within the component and frequently make radial adjustments to offset minor component misalignment.
• Dishing Distortion of the Diaphragm- The axial relationship between seal teeth and the turbine rotor is critical to a smooth-running and properly sealed turbine. As a turbine ages, the interstage diaphragms/nozzles may creep axially due to differential steam pressures. This axial displacement changes the relationship between the stationary seal teeth and the rotor. If the change becomes too great, the rotor will rub the seal teeth, causing vibration and increased seal clearances. With consideration of “As Found” axial clearances, MD&A can custom make and fit packing to restore seal axial clearances.

CNC-Equipped Containerized Unit
MD&A not only provides precision design engineering of manufactured rings and seals but sends expert technicians with 20 to 30 years of experience in the field for installations and repairs.

Our crews arrive with a fully-equipped mobile containerized machine shop, complete with advanced CNC equipment, printer, computer, high-speed wireless access, and all necessary tools.

See how else MD&A can help you with your Gas & Steam Turbine needs. 

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Why Align?

• Correct bearing loading, reducing vibration & chance of bearing failure
• Correct misalignment caused by turbine foundation settlement
• Minimize rotor stresses due to improper bearing positions
• Prevent new seals from rubbing
  • Consideration for Component distortion
  • Correct Internal misalignments
  • Ensure proper reassembly

  MD&A provides turbine owners with the greatest depth of Topless Alignment® experience in the power generation industry. Our alignment process is a proven technology accompanied by an outstanding record of successful applications on nearly all makes and models of machines.

  The Topless Alignment® Service, or Diaphragm Alignment, starts with the centerline measurements, which were made with “Tops-Off” only. Then the shell horizontal joint distortion is measured & is used to determine centerline component Tops-On to Tops-Off movements. The calculated movements are used as offsets when aligning in the “Tops-Off” condition. This saves any power utility man-hos and reduced outage duration.

  MD&A engineers have successfully aligned over 1700 steam turbine sections using the Topless Alignment® method. Our projects have a remarkable record for “lack of rubbing.” We believe this historical track record of success is an important fact that differentiates our service from those available elsewhere in the industry.

  

  MD&A Alignment Engineers bring both depth and breadth of experience to the turbine deck. Each of our Alignment Engineers performs between 10 and 25 turbine section alignments per year. This depth of experience allows our engineers to constantly sharpen their skill sets and apply some of the most modern techniques available. Our experience base includes successful projects dating back more than 30 years.

  Our Alignment Engineers have the expert knowledge needed in order to interpret the data. They make sure they have valid data for your machine. Each engineer’s broad base of experiences contributes to the overall value we provide as your alignment contractor. You can expect dependable and accurate results every time you hire MD&A to align your turbine.

  Charles Monestere, MD&A’s Laser Alignment Services Manager, said:

  “Our alignment engineers are top in their field. They have been working many years, some decades, on different turbine-generator alignment projects honing their skills. Our alignment team is dedicated and responsive to the customer’s specific alignment needs and does their best to deliver the quality expected and the service when needed. A number of service providers send technicians who just collect data for the customer. Our engineers do the alignment calculations and review options with the customer. Select your alignment engineer / specialist carefully. Not all are created equal!”

  Have MD&A perform a Topless Laser Alignment® today, call Charles Monestere at (518) 399-3616 or use our Contact form.

  

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