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Hydra-Cell T-Series pumps to API 674 Standard… MORE

Hydra-Cell T-Series pumps to API 674 Standard… MORE
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17 Jul 2014

Hydra-Cell T Series seal-less triplex diaphragm pumps are now optionally available compliant with the requirements of API 674, 3rd Edition, December 2010.

T Series pumps, originally developed to handle severe pumping applications in the oil and gas industries, offer direct alternatives to triplex plunger pumps traditionally used in these areas - with the critical advantage that the life cycle costs (LCC) of owning and operating a Hydra-Cell pump are typically much lower than those of an equivalent plunger pump.

Cost factors associated with packed plunger pumps include seal wear, leading to energy waste and risk of leaks, and the extra costs of frequent maintenance and replacement of vulnerable parts.  The plungers are directly exposed to the pumped liquid. They are often made in exotic materials, or hard coated to improve corrosion and wear resistance.  Replacement is relatively expensive and typically needed at yearly intervals.

All these costs are eliminated by the seal-less Hydra-Cell design, in which hydraulically-balanced diaphragms incorporated in a single pump head totally isolate wetted parts from the drive mechanism of the pump, which operates submerged in oil that is free of contamination.  Routine oil changes are less frequent.  Plungers, working in the oil, never come into contact with the pumped liquid. They are not expensive to replace, but in any case their life expectancy is more than 10 years.

Above all, there are no seals or packings to replace.

API 674 requires that the equipment be designed and contructed for a minimum service life of 20 years and at least 3 years of uninterrupted operation, but ‘normal’ maintenance and wear parts are excluded. This can be a significant exclusion in terms of running expenses  – and it underlines the value of Hydra-Cell’s reputation as ‘best in class’ when comparing the Life Cycle Costs of different types of pump.

There are currently two models in the T Series range.  The T8045 can deliver flows up to 170 l/min at 207 bar, while the T8030 is rated at 345 bar and 98 l/min, with API 674 options for both. 

Both informative and prescriptive, API 674 is not a pump specification but incoporates a detailed list of requirements, some of which may be disregarded by mutual consent of purchaser and vendor.  There is provision for pump manufacturers to agree a list of exceptions with the customer, while maintaining compliance with the standard: a facility adopted by the majority of suppliers of large process pumps to the oil and gas industries.  

Wanner Engineering’s own exceptions list follows careful evaluation of the current T Series pumps in respect of API 674.

There are many applications for T Series pumps.  They are to be found in sectors that include oil production and refining, gas extraction and processing, chemical and petrochemical processing and transfer.

In the oil and gas industries the pumps have been subjected to the most rigorous long term test programme under the most arduous field conditions, pumping a variety of liquids from drilling muds and oilfield chemicals to produced water with high sand content.

(Photo caption pic top right): Hydra-Cell T8030 and T8045 pumps can now be offered in accordance with the API 674 standard.