Share this
Improving Pump Seal Reliability for Bay Area Petrochem Plants
by Paul Lesnau on 3/10/20 2:13 PM
Keeping thousands of pumps in San Francisco Bay Area refineries running 24/7/365 requires a well-planned and well-executed maintenance strategy. Unplanned failures may have ramifications for safety, budget, and compliance—especially with regard to Bay Area Air Quality Management District (BAAQMD) regulations.
One of the most mission-critical elements for smooth operations is pump seal reliability. Many plants run pumps outside the safe operating envelope and replace them only when economically feasible. Over time, however, you increasingly risk catastrophic downtime. Fortunately, you have the means to largely mitigate pump seal reliability problems with awareness and proactive management of conditions to improve safety and compliance.
4 Ways to Improve Pump Seal Reliability
Multiple factors may lead to pump failure. But mechanical seals are one of the most crucial components of pump reliability, accounting for approximately 39% of pump failures. While not all-inclusive of the problems that can impact pump seal reliability, I’ve highlighted four categories where strategies to mitigate pump seal problems before they can take hold within the refinery operations and lead to leaks or air quality violations.
1. Invest In Proper Design And Installation Training
Perhaps the most fundamental way to improve reliability and prevent unplanned downtime due to mechanical seal failure is to ensure the pump has been designed and employees are properly trained on installation to meet the specific process requirements. Baseplates must be solidly anchored. Motor, coupling, pump, and piping need to align within tolerance. And the mechanical seal installed needs to match the operational requirements of the process. In the California Bay Area, for instance, refineries are often running sour crude, which contains more sulfur and acidic components that may affect the specified O-ring or require a different barrier fluid.
When examining pump design and installation by those who are not adequately trained, you may see a variety of negative effects on reliable operations which undermine pump dependability, such as:
- Shaft misalignment
- Incorrectly mounted seats
- Improper assembly length
- An axially moving shaft
These issues result in shaft wear, excessive vibration, abnormal wear on the dynamic O-ring, and poor contact between the seal ring and seat. But all of this can be avoided with a pump seal support system designed by an expert consultant who can help you choose the right system provide best-in-class assembly services, and offer training on appropriate installation.
2. Extend Pump Seal Life With Sufficient Lubrication
Proper lubrication by the pumped fluid is critical to the proper functioning of mechanical seals, particularly those with hard/hard seal face material pairings. Inadequate lubrication causes friction between the seal faces and increases operating temperatures which can, in turn, damage elastomeric parts in minutes. Other sources of friction are related to pumped fluid when viscosity is very low, causing intense frictional heat to dissipate across the seal face so that small, radial, thermal cracks emerge resulting in leakage.
Seal materials must be selected in consideration of pumped fluids and, in many cases, you also need mechanical seal support systems designed to cool the pumped fluid. While you may have a preferred vendor list, if the refinery is experiencing low pump seal reliability due to insufficient lubrication (especially with heavier crude), it may be time to get a new consultation and explore the options. A new set of eyes may be better able to identify areas where your pump seal needs better lubrication, and provide a fully-assembled seal support system to improve pump seal reliability.
3. Filter Out Particulate Contaminants
Any process involving a mixture of miscible liquids, a solution of solids, and suspended insoluble particles introduces the risk of mechanical seal contamination. O-ring movement can be constricted by settlements or precipitations building up on the shaft, preventing movement as temperature or pressure change in the system. Some suspensions and solutions cause deposit build-up on sections of seal faces, creating gaps that lead to a leaking seal shaft, with small leakage at the beginning and increasing as the sealing gap grows—potentially leading to BAAQMD violations. In addition, small amounts of hard particulate between hard/soft seal face pairings embed in the soft face and grind on the hard face resulting in leakage.
Filters incorporated into the mechanical seal support system can effectively remove particulate contaminants, thereby increasing pump seal reliability. Assemblies with bypass options allow maintenance to change filters without incurring downtime. If the system you currently have in place does not have this bypass option, you need to take a closer look at the cost of continued maintenance versus the cost of a newer system.
4. Prevent Chemical Degradation And Wear
Chemical and physical environments are key factors influencing mechanical seal reliability. An improperly lubricated seal will fail early due to wear. Corrosion can also be an issue when seal ring materials are not properly matched to pumped fluid.
Rotating equipment engineers need to specify mechanical seals that can adequately handle high temperatures as well as mechanical and chemical loading. Ideally, wear on seals matched for the load and environment should be so minimal that the seal will operate for many years.
But relying on in-house solutions may provide less-than-satisfactory results, causing slowed—or even halted—operations, inadequate parts installed, and the potential burden of scrap when mistakes occur. You can relieve internal resource constraints by outsourcing pump seal assembly services to a local company that can deliver the pump seal components you need—completed and tested for reliability.
Your First Choice For Better Pump Seal Reliability in Northern California
Swagelok understands how critical pump seal reliability is to optimal refinery operations. The mechanical seal support systems we design, configure, and build in Northern California simplify maintenance and improve uptime. Custom configurations, critical spares, and technical expertise are available locally, with just one call. Whether the need is for reliable components or custom turnkey Assembly Services, Swagelok helps keep your rotating equipment running efficiently, with less downtime and fewer leaks.
To find out how Swagelok Northern California can help solve your pump seal challenges and improve reliability, contact our team today by calling 510-933-6200!
About Paul Lesnau | Sales Manager, Business Development Manager, and Field Engineer
Paul holds a B.S. in Mechanical Engineering from North Dakota State University. Before joining Swagelok Northern California, he was the West Coast Regional Sales Manager for an organization based in Illinois involved in pneumatic and hydraulic applications where he supervised product distribution throughout the western United States, Canada, and Mexico. While in this role, he was able to help provide technical and application-specific expertise to customers and distribution to drive specifications.
Share this
- Mission Critical (465)
- Assembly Services (163)
- Seal Support Systems (96)
- Training (74)
- Swagelok Northern California (54)
- Fittings (51)
- Tips (50)
- Best Practices (48)
- Semiconductor (48)
- Hoses (47)
- Assembly Solutions (46)
- Regulators (44)
- Tubing (42)
- About (36)
- Grab Sample Systems (32)
- Sampling Systems (32)
- Services (30)
- Gas Systems (29)
- Swagelok (27)
- Downloads (26)
- Valves (24)
- Video (24)
- When Will It Burst? (19)
- Orbital Welding (17)
- Case Study (13)
- Steam (13)
- FAQs (12)
- Tools (12)
- Industries (11)
- pressure gauges (7)
- Company News (6)
- Design (6)
- Sealants (6)
- Subsystems (6)
- Thermal Management (6)
- People (5)
- gas delivery system (5)
- Application Support (4)
- Catalog (4)
- Oil + Gas (4)
- Vacuum (4)
- Webinars (4)
- Customer Briefing Center (3)
- Materials (3)
- Measurement Devices (3)
- Pocket Guide (2)
- Swagelok Reference Point (2)
- Website (2)
- sesemiconductor gas equipment (2)
- Analyzer (1)
- Fluid Systems (1)
- Food Processing (1)
- Pharma (1)
- Quality (1)
- September 2023 (1)
- August 2023 (2)
- June 2023 (1)
- March 2023 (3)
- February 2023 (3)
- January 2023 (4)
- December 2022 (4)
- November 2022 (4)
- October 2022 (4)
- September 2022 (1)
- August 2022 (3)
- July 2022 (2)
- June 2022 (4)
- May 2022 (1)
- April 2022 (2)
- March 2022 (1)
- February 2022 (2)
- January 2022 (3)
- December 2021 (1)
- November 2021 (6)
- October 2021 (6)
- September 2021 (8)
- August 2021 (4)
- July 2021 (3)
- June 2021 (6)
- May 2021 (6)
- April 2021 (7)
- March 2021 (5)
- February 2021 (4)
- January 2021 (6)
- December 2020 (5)
- November 2020 (6)
- October 2020 (6)
- September 2020 (8)
- August 2020 (7)
- July 2020 (8)
- June 2020 (8)
- May 2020 (6)
- April 2020 (9)
- March 2020 (7)
- February 2020 (10)
- January 2020 (21)
- December 2019 (23)
- November 2019 (21)
- October 2019 (22)
- September 2019 (21)
- August 2019 (22)
- July 2019 (23)
- June 2019 (20)
- May 2019 (23)
- April 2019 (22)
- March 2019 (21)
- February 2019 (20)
- January 2019 (21)
- December 2018 (14)
- November 2018 (19)
- October 2018 (23)
- September 2018 (17)
- August 2018 (29)
- July 2018 (11)
- June 2018 (6)
- May 2018 (5)
- April 2018 (4)
- March 2018 (5)
- February 2018 (3)
- January 2018 (3)
- December 2017 (2)
- November 2017 (4)
- October 2017 (3)
- September 2017 (2)
- August 2017 (6)
- July 2017 (4)
- June 2017 (4)
- May 2017 (4)
- April 2017 (3)
- March 2017 (4)
- February 2017 (3)
- January 2017 (3)
- December 2016 (3)
- November 2016 (3)
- October 2016 (3)
- September 2016 (5)
- August 2016 (5)
- July 2016 (4)
- June 2016 (5)
- May 2016 (3)
- April 2016 (4)
- March 2016 (5)
- February 2016 (11)
- January 2016 (1)
- December 2015 (3)
- November 2015 (4)
- October 2015 (3)
- September 2015 (4)
- August 2015 (4)
- July 2015 (8)
- June 2015 (5)
- May 2015 (3)
- April 2015 (4)
- March 2015 (4)
- February 2015 (3)
- January 2015 (4)
- December 2014 (2)
- November 2014 (3)
- October 2014 (4)
- September 2014 (4)
- August 2014 (4)
- July 2014 (5)
- June 2014 (4)
- May 2014 (4)
- April 2014 (5)
- March 2014 (4)
- February 2014 (3)
- January 2014 (4)
- December 2013 (5)
- November 2013 (3)
- October 2013 (4)
- September 2013 (3)
- August 2013 (5)
- July 2013 (5)
- June 2013 (5)
- May 2013 (3)
- April 2013 (6)
- March 2013 (4)
- February 2013 (4)
- January 2013 (8)
- December 2012 (4)
- November 2012 (6)
- October 2012 (6)
- September 2012 (4)
- August 2012 (4)
- July 2012 (4)
- June 2012 (4)