Convincing high pressure seals for pipeline pumps

Sealing solution SHVI-CGSH for unmanned pump stations

KeyVisual_CaseStudy_SHVI-CGSH_USA.jpg
Situation

Different operating conditions promote dry running and seal failure

Challenge

Design a single seal for varying vapor pressure and changing composition of medium

Solution

Single high-pressure seal SHVI with Containment Seal CGSH from EagleBurgmann

CaseStudy_SHVI-CGSH_USA.jpg

Enterprise Products Partner LP is a US-pipeline operator with headquarters in Houston, Texas, USA. In addition to a large natural and liquid gas network, the company operates oil pipelines with a length of approximately 10,000 km (6,200 mi). The "Seminole Redline" pipeline extends 800 km (500 mi) from the city of Seminole near the New Mexico border via eleven pump stations and ends in north Houston.

The pump stations are equipped with multistage, axially split multi-fluid pipeline pumps from Bingham and United. These were originally sealed with single and dual competitor seals. The performance of these seals with an MTBR (Mean Time Between Repair) often of only one month resulted in high costs and expenditures for the end user. Among others, the reasons for the failures were the changing properties of the multiple light hydrocarbons and the occurring pressure peaks. Especially problematic: the strongly varying steam pressure of the medium which caused the seal to run dry and fail.

In 2015, the pipeline operator initiated measures to improve the situation and consequently approached EagleBurgmann with two requirements: For one, all pumps installed in the unmanned stations have to be sealed with single seals to prevent maintenance costs for seal supply systems. For another, the unsatisfactory MTBR intervals have to be significantly extended in order to sustainably increase the availability of the pump stations.

Operating conditions

  • Suction pressure: p = 18.2 … 44.8 bar (265 … 650 PSI)
  • Outlet pressure: p = max. 75.8 bar (1,100 PSI)
  • Vapor pressure: 0.34 … 36.0 bar (5 … 523 PSI)
  • Temperature: t = +26.6 °C … +29.4 °C (+80 °F … +85 °F)
  • Rotational speed: n = 3,240 … 5,400 min-1
  • Medium: Ethane/propane mix, natural gas (Y grade), propane, Iso- and n-Butane

SHVI197-CGSH1-OM.eps

An EagleBurgmann technology team concentrated on designing a reliable and economic seal. The customer was then presented with a solution that was based on the proven single high pressure seal SHVI with an containment seal type CGSH.

The geometries of the seal face and stationary seat of the SHVI product side were optimized with FEM calculations and conditioned for reliable application under all operating conditions and media compositions. The seal faces are designed so that the liquid portion of the medium is vaporized and only gaseous leakage from the product side reaches the CGSH containment seal.

Upon gas entry, the uni-directional U-grooves of the CGSH seal, incorporated in the stationary seat of the seal ensure separation of the seal faces and contact-free and wear-free operation.

The sealing solution was successfully tested at a special rig of the R&D facilities of EagleBurgmann. Despite the critical changing properties of the medium (viscosity, solids and gas content) the shafts of the axially split multi-stage pumps of the customer are securely sealed in all operating conditions.

Product_SHV.jpg

EagleBurgmann successfully installed several SHVI-CGSH seals in the field. A common seal would typically run for less than 500 hours, meaning roughly one month. The first EagleBurgmann seals to be installed have run over one year without any issues. Thus, the pipeline operator retrofitted all eleven pump stations to the new seals. All in all, eighty seals have been supplied.

The savings in maintenance and repair costs as well as the significant increase of availability and cost-effectiveness of the pumps and pump station are convincing. The customer is accordingly satisfied.

Solution: SHVI-CGSH USA EN

Further reference projects

KeyVisual_RoTechBooster_Dock_Sud
Argentina

Clean gas despite fluctuating operating conditions

Frequent starts and stops are a severe test for gas-lubricated compressor seals. Installed in an Argentinean combined cycle power plant is an EagleBurgmann supply system that provides a continuous gas flow rate for the seals and adapts it to changing conditions. Since then, the operational reliability of the compressors has increased significantly.

Read on for the entire case study
KeyVisual_CaseStudy_AGSR_Schaufeltrockner.jpg
Germany

Clean sealing solution for demanding crystal production

Seals are a risk factor in the production of liquid crystals. If there is even the slightest contamination of the liquid crystals, this will later affect the image quality of the display. Read on to see which sealing solution Merck KGaA uses in paddle dryers for the production of liquid crystals.

Read on for the entire case study
KeyVisual_CaseStudy_SHVI-CGSH_USA.jpg
United States

Convincing high pressure seals for pipeline pumps

Reduce maintenance costs for seal supply systems and extend MTBR intervals - EagleBurgmann's task was to significantly improve the availability of unmanned pump stations in a gas pipeline in Texas with single seals for multifluid pumps.

Read on for the entire case study
KeyVisual_CaseStudy_Schiffstechnik.jpg
Germany

Cruise liners with DiamondFace-coated mechanical seals

Cruise liners have to reduce their sulfur emissions in Emission-Controlled Areas (ECAs). To accomplish this, light fuel oil is used in coastal regions - with significant consequences for the ship's fuel supply.

Read the complete case study
KeyVisual_CaseStudy_DF-M7N.jpg
Germany

DF-M7N DiamondFace for tank drainage pumps

The chemical company Global Amines is one of the worldwide leading manufacturers of special chemicals. The "Southeast Bavarian Chemical Triangle", near Altötting, Germany is the location of the Gendorf plant. Global Amines produces preliminary, intermediate and finished chemical products here. EagleBurgmann successfully converted a chemical standard pump from a competitor's seal to an EagleBurgmann DF-M7N DiamondFace mechanical seal and achieved significantly increased pump and system availability.

Read the complete case study
KeyVisual_CaseStudy_MFLWTI.jpg
Germany

DF-MFLWTI DiamondFace mechanical seal for refinery pumps

The TOTAL refinery at the Leuna chemicals site is one of the most state-of-the art facilities of its type in Europe. It processes around 30,000 tonnes of crude oil every day, most of which is pumped in from Russia.

Read the complete case study
Show all references
Newsletter

Excellence in Practice

With our free e-mail newsletter „Excellence in Practice“, you will receive first-hand information about current products, services, references and worthwhile industry insights.