Caleffi 546005 DISCALDIRT 3/4 Inch Deaerator and Dirt Separator

The 546005 is the 3/4 inch DISCALDIRT, a Caleffi brass device that removes both air and dirt from a closed water circuit in one body. The float vent at the top expels micro-bubbles while the internal mesh element drops solids into a lower chamber with a drain cock, so a boiler, chiller or heat pump sees clean, air-free water without a separate strainer that needs to be opened and cleaned.

One body for air and dirt

In the DISCALDIRT the same concentric mesh surfaces do two jobs. They create the swirl that lets micro-bubbles attach, merge and rise to the vent, and they act as a collision surface for particles, which fall by gravity into the collection chamber at the bottom. Because nothing is trapped on a fine screen, the datasheet points out that head loss is much lower than a Y-strainer and is not affected by how much dirt has been collected: its comparison graph shows the 3/4 inch Y-strainer at Kv 8 against Kv 16.2 for the DISCALDIRT.

Key features from the datasheet

• Separates air and dirt continuously and collects the solids in the lower chamber, from which they can be expelled while the system runs
• Threaded versions carry a shut-off cock and hose connection with plug on the collection chamber
• The 5461 series magnetic sibling adds ferrous-impurity capture; the 546005 here is the non-magnetic version
• Pre-formed hot shell insulation supplied with the threaded 546005, 546006 and 546007, usable on chilled water
• Serviceable in place: lift the top cover to reach the vent mechanism, or unscrew the large dirt chamber to pull out and wash the internal element
• Float vent with a long float chamber that keeps impurities away from the seat

Technical specification

Selection and ordering guide

The 546 series covers 3/4 inch to DN 300. The threaded sizes below carry insulation; larger flanged and weld-end units are supplied with aluminium-clad insulation, and the 5461 series adds magnets for ferrous particles.

Kv values: 16.2 (3/4″), 28.1 (1″), 46.7 (1 1/4″) for the small threaded sizes.

Installation and maintenance notes

• Mount vertically only; the datasheet favours a spot just after the boiler, on the suction side of the pump, because most micro-bubbles form there.
• Both heating and cooling circuits suit it; design for flow speeds around 1.2 m/s at the connections, which for the 3/4 inch body means 22.7 l/min.
• Expel dirt through the drain cock during operation; to inspect the internal element, unscrew the dirt chamber to which it is fixed.
• If the vent will be hard to inspect, swap its cap for the Caleffi 5620 hygroscopic version.
• The datasheet reports that after about 50 recirculations (roughly one day of operation) up to 100 % of larger particles and on average about 80 % of smaller ones are removed from the circuit.

Applications in Gulf building services

Chilled-water loops in the region are often flushed and refilled during commissioning, and new pipework carries mill scale, weld spatter and sand that travel straight to heat exchangers, pumps and control valves. A 3/4 inch DISCALDIRT is a compact way to protect a single boiler, heat pump or fan-coil header, and the insulated body avoids condensation on cold lines. The datasheet limits medium to water and glycol solutions at 0 to 110 degrees C.

Selection and installation notes

Hydronic components are selected from the design flow, the pressure drop and the maximum working pressure and temperature of the circuit. Check the connection size and thread type, fit isolating valves so the part can be serviced, flush the pipework before commissioning and respect the flow direction marked on the body. Insulate heating and chilled-water parts according to the project specification.

Information needed for a quotation

Send the full model code, the quantity, the delivery location in Oman or the GCC, the intended use and any accessories needed, so that the complete package can be quoted together.

Documents and supply information

The manufacturer data sheet is attached to this page and should be read together with the project specification and the site risk assessment before a purchase is confirmed. Ratings, standards and dimensions are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.

Related items

The datasheet cross-references the DISCAL 551 series deaerator (brochure 01060) and the DIRTCAL 5462 dirt separator (brochure 01137), and recommends the 5620 series hygroscopic safety cap for vents in locations that cannot be inspected. Confirm the exact code, connection and insulation before ordering.

Frequently asked questions

What does the Caleffi 546005 remove?

Air through a float-operated automatic vent and dirt through a mesh internal element that drops solids into a lower chamber with a drain cock.

Is it magnetic?

No. The 546005 is the non-magnetic DISCALDIRT; the 5461 series is the version with magnets for ferrous impurities.

How is it installed?

Vertically, preferably after the boiler on the pump suction side, in heating or cooling circuits, with flow kept near 1.2 m/s.

What are the limits?

Up to 10 bar and 0 to 110 degrees C, using water or glycol mixtures with at most 50 percent glycol.

Who can quote the Caleffi 546005 in Oman?

Seven Star LLC, an independent Muscat supplier, can quote this exact code; tell us the size, version and insulation you need.

Documents and quotation

The Caleffi datasheet 01123/17 GB for the DISCALDIRT 546 and 5461 series (edition 2017) is hosted with this listing. For a quote, send the code, number of units and the flow data of the circuit. See more in Hydraulic Valves & Components.