Industrial Filtration Systems and Elements <span>BOILFILTER / BOLLFILTER</span>

Identification of BOILFILTER / BOLLFILTER Candle Filter Elements by Part Number

When selecting candle filter elements for BOILFILTER (Boll & Kirch) systems, the primary reference is the seven-digit manufacturer article stamped on the end cap or collar, such as 1940236 HC1-HR-G VA-A.

This code designates the physical dimensions, connection geometry, and stainless steel mesh grade. In automated backflushing assemblies, candles work in parallel clusters, making dimensional adherence to 72x208 mm essential for clean hydraulic seating.

If the stamped code is illegible due to wear, identification proceeds via the filter vessel nameplate and serial records.

Maintenance and Cleaning Protocol for BOILFILTER / BOLLFILTER Mesh Inserts

Routine servicing of BOILFILTER mesh inserts begins with monitoring the optical or electrical differential pressure indicator, such as series 4.36 or 4.46.

When the threshold pressure drop is reached, the active chamber of a duplex unit is switched over to the standby chamber without interrupting process flow. The isolated chamber is fully depressurized via the vent plug prior to element removal.

Wire mesh rejuvenation is performed through immersion in BOLL-CLEAN 2000 solution, ultrasonic bath treatment, and final drying with clean compressed air up to 4 bar.

Operating Principles of aquaBoll Automatic Backflushing Systems

The BOILFILTER / BOLLFILTER aquaBoll 6.18 series utilizes a bipolar fluid distribution design where process liquid enters candle elements from both axial ends, providing uniform velocity and debris accumulation across the entire mesh surface.

Self-cleaning backwash is initiated automatically upon reaching 0.3 to 0.5 bar differential pressure or via a programmable timer.

A motorized backwash arm sweeps past each candle port, discharging retained solids into the sludge drain through pressure differential without causing pressure loss in the main downstream line.

Selection Criteria for Simplex and Duplex BOILFILTER Filter Assemblies

The decision between simplex and duplex BOILFILTER units depends on whether fluid flow can be temporarily suspended for scheduled maintenance.

Simplex assemblies, such as 1.12.2 and 1.53.1, offer a compact, economical configuration for batch operations where pump shutdown is acceptable during element washdown.

Duplex assemblies 2.04.5 and BFD are mandatory for continuous lubrication lines, power plant cooling loops, and marine fuel supply, where changeover valves ensure uninterrupted fluid delivery with positive chamber isolation.

Mesh Materials and Filtration Fineness for Aggressive Fluid Media

BOILFILTER elements incorporate stainless steel wire cloth in plain, twilled, and Dutch weaves manufactured from AISI 316L, 1.4571, or titanium alloys for seawater and aggressive chemical streams.

For fine particle retention from 10 to 150 microns, pleated star elements maximize effective filtration surface within a compact diameter.

For high particulate loading and viscous fuels, heavy-duty wedge wire and multimantle concentric sleeves deliver structural strength against severe pressure drops without media deformation.

Differential Pressure Monitoring and Filter Element Diagnostics

To ensure dependable operation, BOILFILTER / BOLLFILTER housings are equipped with visual and electrical differential pressure transmitters, including models 4.36 and 4.46. These instruments deliver two-stage warnings that can be connected directly to plant control systems.

An initial warning triggers at 70 to 80 percent of maximum permissible dirt loading, giving technical personnel ample lead time to switch chambers or prepare replacement elements, thereby preventing pump cavitation and line starvation.