Filtersafe provides high performing BWMS filters for ConocoPhillips Fleet

Filtersafe multifilter installed on Polar fleet

Learn why ConocoPhillips chose the De Nora BALPURE® BWMS with Filtersafe filters for their entire Polar Vessel fleet.

ConocoPhillips, Alaska’s largest crude oil producer and the largest owner of exploration leases, operates a series of vessels traveling between Alaska and San Francisco. This west coast route has particularly challenging conditions due to widely ranging water quality, including high sediment waters in San Francisco Bay.

ConocoPhillips Polar route with Filtersafe filtersConocoPhillips recognized the need for high-performing ballast water management system (BWMS) filters to ensure regulatory compliance and operational efficiency. In 2015, the company invested in independent testing to assess and choose the right BWMS filter for the fleet’s operational route.

It was through this testing that they came to the conclusion to install the De Nora BALPURE® BWMS with Filtersafe filters across the fleet.

The BallastSafe BS300-T filter . The filter is designed to perform under high sediment loads in poor water quality areas and has a flow rate of 750 m3/hr. Due to the enormous size of the ships in the fleet, it was decided that in addition to 2 BallastSafe BS300-T filters, that 2 additional BallastSafe BS1204H filters should be added when the BWMS is installed in each ship.

 

Filtersafe solution

Most filters build a “cake” i.e. an uncleanable part of the filter created over time as a result of a decrease in water pressure in the filter system. For the filter to return to optimum performance levels, the filter must be manually cleaned. In contrast to most filters, Filtersafe’s solutions are the only technology available to the global shipping industry today which is self-restoring.

This means the filters have no uncleanable areas and are able to remove even the toughest build-up, with the filter returning to its original clean state after every heavy use in less than three minutes. For example, in the Shanghai Test our filter fully recovered from an unimaginable TSS load of 2,450 ppm in 182 seconds. 

Filtersafe has an exclusive, upgradeable cleaning mechanism that can be modified even after installation to improve cleaning efficiency. This means the filter can be configured according to the vessel’s trading waters and then changed as those trade routes are altered over the life of the ship. This is significant as it removes the limitations that ballast water management systems (BWMS) have traditionally placed on ships, allowing vessels to move between low and high sediment routes, such as the tankers navigating around high sediment areas of San Francisco, without being prohibited by filter performance.

 

Results

The filter operated under various conditions for several months, monitoring and recording hundreds of hours of valuable operation data. The results of the tests demonstrated flow rates varying between 400-750 m3/hr. These rates were recorded during testing and varied according to inlet pressure levels and sediment loads, which reached as high as 400 Nephelometric Turbidity Units (NTU) (TSS 350- 400mg/L). The filter performed very well during high sediment loads, especially at known turbid locations such as the Shell Terminal in San Francisco Bay and the ports of Anacortes and Valerio in Washington, recovering quickly from the high dirt load conditions. In addition, the filter operated without the need for manual cleaning throughout the duration of the test.

Following the successful installation and the test results on board the pilot Polar vessel transporting fuels regularly between Alaska and other major energy producing ports along the North American West Coast, ConocoPhillips decided to install Filtersafe filters on the entire Polar fleet.

Following the initial test, all five crude oil tankers in the Polar fleet will feature filtersafe filters as an integral part of their BWMS, with 2 ships already past installation and commissioning and the rest with planned installation datesin 2022: Polar Endeavour, Polar Enterprise, Polar Resolution, Polar Adventure and Polar Discovery, as outlined above. Each vessel was assessed according to its ballasting needs to ensure the right filters and flow rates were chosen. Filtersafe also worked with a leading class society, the American Bureau of Shipping (ABS), to complete a successful remote pressure test survey to certify the filters ahead of installation to ensure the highest standards for ConocoPhillips.

To read more about the installation, please download the case study here:

What the Shanghai Test Results Tell Ship Owners About a Ballast Water Filter

Shanghai River with Muddy Water

Savvy ship operators know that the right filter is key to not only complying with IMO and USCG regulations but also to ensure that their ship can sail and ballast anywhere, in addition to costing or saving a ship money by how long it takes to filter and fill a ship’s ballast water tanks.

Shipowners and operators regularly ask Mr. Louis Peperzak (Technical Manager Ballast Water Services at Control Union) and his colleagues: “How am I supposed to trust that a ballast water filter will work in severe circumstances?” they continue: “since IMO regulations account for 50 mg/L of TSS but in Shanghai Harbor, TSS concentrations can reach up to 1,000 mg/L?”

They turned to Control Union specifically as they are a highly respected 3rd party certifier of various maritime QA/QC evaluations, including for ballast water management systems. The Control Union as a whole is a collection of international companies that offer certification in various industries, including marine and ballast water.

What is the ‘Shanghai Test’?

This is how Control Union came to create their ‘Shanghai Filter Test’, which seeks to mimic the muddy, turbid waters of the popular Shanghai Port. If a ballast filter could manage to filter the 1,000 TSS mg/L of suspended solids that can be found in the waters of Shanghai without clogging, then they could be confidant that their ship can sail to and ballast in any port without fear that the filter would clog from water with high total suspended solids (TSS).

The test puts water with mud the similar consistency and particle size distribution as the mud found in the Port of Shanghai through the filter at increasing amounts until the filter has less than 5% outflow and effectively clogs. Since the Port of Shanghai can have a maximum TSS of 1,000 mg/L that is the benchmark Control Union has set for whether a filter passes the test or not. If a filter can work at 1,000 mg/L without clogging, it is considered to have passed the test.

A clogged ballast water filter is an expensive and time-consuming problem for shipowners. A clogged filter means:

  1. The ballasting process must stop while the filter is cleaned, halting loading or unloading of cargo from a ship;
  2. Seafarers must invest manpower and spend time cleaning the filter instead of attending to their other important, onboard duties;
  3. More time spent in port, having to pay port fees, and time lost on the delivery route.

If a shipowner can know that a ballast water filter comes tested & certified by Control Union as having passed the test and not clogging at 1,000 mg/L of TSS, they can have more confidence in their entire BWMS. This means a certified ballast filter is also of interest to BWMS manufacturers and naval architects who help ship operators pick and install their BWMS.

Filtersafe’s Shanghai Test Results

Filtersafe sent 5 configurations of its ballast water filter to the Control Union location in the Netherlands for the test (a combination of 25 micron and 40 micron screens paired with standard, turbo and superturbo automatic self-cleaning options in a BS101 filter body).

Filtersafe is proud to announce that not only did all 5 of the configurations pass the 1,000 mg/L challenge, all filters were challenged with increasingly turbid water, up to 2,450 mg/L, and none of them clogged.

We invite you to take a look at the results yourself. You can download the Shanghai Test Report to receive an explanation in detail of how the test was conducted and the results of each of the 5 tests.

Please fill out the form below to immediately download your copy of Filtersafe’s Shanghai Test Report.