Durco Mark 3 Pump – ANSI/ASME standard

The Durco Mark 3 Pump – reliability is one of its key features

The Durco Mark 3 Pump is a Centrifugal Pump or alternatively described as a chemical transfer pump with decades of provenance. It is highly regarded as an Industry workhorse for its reliability in transferring chemicals on a daily basis. It has certain features which make it reliable and easy to maintain. It has a multitude of options available to suit the application to increase reliability & make life easy for the Maintenance Engineers. One of its unique features is the “Reverse Vane” Impeller which is ideally suited for applications with double mechanical seals because of the low seal pot pressure required when compared to its competitors.

The Durco Mark 3 Pump is highly engineered and is designed and built to clients specifications either to ANSI (ASME) or ISO Centrifugal Pump standards.

ANSI vs ASME vs ISO Pump Standards?

ANSI is the abbreviation for American National Standards Institute and ASME is the abbreviation for American Society of Mechanical Engineers and these 2 American bodies work together to bring uniformity to US national and global standards used in the engineering sectors. Whereas ISO which is the abbreviation for International Organization for Standardization is more focused on standardising International and European standards.

What is the Durco Mark 3 ANSI (ASME) Pump typically used for?

The Mark 3 ANSI (ASME) pump is used for corrosive applications in chemical, petrochemical, hydrocarbon and pharmaceuticals processing requiring unequalled efficiency, extended life and repeatable pump performance.

Benefits of the Mark 3 ANSI Pump:

  • Lower total costs of ownership from reverse vane impeller, which eases maintenance and provides renewable, high-efficiency performance over the pumps’ life. Reverse vane impeller is the only impeller design that offers repeatable pump performance throughout the life of the pump. Open impellers are available.
  • Increased reliability and mechanical seal life due to the ideal seal environment created by the SealSentry seal chamber.
  • Ease of maintenance resulting from the optimal, predictable seal chamber pressures that are re-established after every impeller setting.
  • Extended mechanical seal and bearing life through a robust shaft and bearing designs that also minimise shaft deflection.
  • Back pullout design allows removal of a rotating element without removing casing, piping or motor.

Why is the Flowserve Durco Reverse Vane impeller so good?

  • With the RV impeller, the seal chamber pressure is a function of suction pressure, even when VSD driven and so remains constant. This permits easy setup of seal pot pressures and increases mechanical seal life. With competitor designs, one using open or semi-open impellers, seal chamber pressures are a function of discharge pressure and require complex calculations to establish pressure at the seal and require higher seal pot pressures = shorter seal life. This can be critical when a limited nitrogen pressure is available in the plant. Flowserve datasheets always show the seal chamber pressure, especially useful when evaluating quotations.
  • Reverse Vane impeller with balance holes is standard – seal chamber pressure is reduced for increased reliability of the mechanical seal. Adjustment of impeller clearance does not increase the seal chamber pressure.
  • Reverse vane impeller clearance is set in the workshop. Competitor designs with open impellers require final adjustment of impeller and seal in the field. This adds to maintenance costs. The competitor jackscrew impeller adjustment design is slower and less accurate than the micrometre adjustment of the Durco Mark 3. In addition, the jackscrew design can lead to uneven bearing loading and reduced bearing life.
  • Adjusting open impellers towards the casing to compensate for wear increases the thrust loads from a larger gap on the backside causing seal chamber pressures to increase. With the RV impeller, wear is taken up by the seal chamber, and replacement cost is about 1/3 that of a casing which is the wear component when using an open impeller.

Some typical applications:

  • Acid transfer
  • Caustic and Chlor-alkali
  • Man-made fibres
  • Polymers
  • Slurry processing
  • Solvents
  • Volatile organic compounds
  • Waste processing

The Durco Mark 3 Pump – reliability is one of its key features

The Durco Mark 3 Pump is a Centrifugal Pump or alternatively described as a chemical transfer pump with decades of provenance. It is highly regarded as an Industry workhorse for its reliability in transferring chemicals on a daily basis. It has certain features which make it reliable and easy to maintain. It has a multitude of options available to suit the application to increase reliability & make life easy for the Maintenance Engineers. One of its unique features is the “Reverse Vane” Impeller which is ideally suited for applications with double mechanical seals because of the low seal pot pressure required when compared to its competitors.

Contact our Pump Specialist Team:

Phil Soltan (External) – Mob: 086 185 3782

Internal Team

Adrian McSweeney – Tel: 021 461 7212

Paul-Fox Morris – Tel: 021 461 7231

Una Long (Pump & Service Support) – Tel: 021 431 7232

Tel: 021 461 7200