Allweiler ALLFUEL AFI Screw Pump

Name: Allweiler ALLFUEL AFI Screw Pump – Datasheet & Quote
Brand: Allweiler
SKU: ALLWEILER-AFI

Compact screw pump for heating oil, fuel and lube oil duty

The Allweiler ALLFUEL AFI is a three-screw, self-priming screw pump for heating oils, fuels including low-sulfur ship fuel and marine diesel, lubrication oils, hydraulic oils and other lubricating liquids. The liquids may not contain abrasive components or chemically attack the pump material. The spec sheet (2016.06, Ident-No. 488130) covers the AFI horizontal and vertical configurations without integrated filter.

ALLFUEL pumps are used as transfer, booster and burner operation pumps in oil-fired systems, as transfer pumps in marine fuel systems, as feeder and filling pumps in tank systems, as lube-oil pumps in nearly all areas of industry and in oil hydraulic systems. A single pump and motor assembly gives a compact installation, and the hardened and polished screws form an insert unit that can be exchanged quickly without removing the pump housing from the pipework.

Technical specifications

Data from the Allweiler ALLFUEL AFI spec sheet (GB/2016.06, Ident-No. 488130).

Parameter	Specification
Pump sizes	10, 20 and 40, with several screw pitch angles (for example 10-28, 10-38, 10-46, 10-56, 20-38, 20-46, 20-56, 40-38, 40-46, 40-54)
Capacity	Up to 112 l/min (at 2900 1/min and 750 mm2/s)
Suction pressure	Up to 6 bar
Discharge pressure	Up to 40 bar
Liquid temperature	Up to 150 deg C
Viscosity range	1 up to 750 mm2/s
Connections	Feed and pressure ports as counter flange based on SAE J518C, 3000 PSI hole pattern
Shaft seal	Maintenance-free unbalanced mechanical seal; silicon carbide rotating and counter ring, peroxide cross-linked FKM seal ring
Overload protection	Integrated pressure-relief valve, standard trigger pressure about 10 percent above working pressure
Variants	AFI-F with integrated radial screen filter (0.4 mm mesh); AFI-T twin unit with reserve pump
Heating	Electric heating cartridges for the seal chamber: 230 V 200 W (sizes 10 and 20), 300 W (size 40)
Materials	Pump casing EN-GJS-400-15; casing insert aluminium or EN-GJL-250 tenifer; drive screw 16MnCrS5 (PVD on W198 versions)
Motor	Surface-cooled three-phase squirrel-cage, IMV 1, IP55, insulation class F; 50 Hz motors may run on 60 Hz networks
Explosion protection	ATEX 2014/34/EU device group II category 2 G
Example performance (1450 1/min)	Size 10-28 at 5 bar: 4.51 l/min, 0.15 kW (3 mm2/s)

Selection and installation

The size code gives the pump size and screw pitch, so 20-46 means size 20 with a 46 degree pitch angle at 1450 1/min theoretical capacity. Check the achievable pressure against the viscosity and speed in the reference curves, and the NPSH values: the sheet lists 2.5 m at low viscosity and 950 to 1750 1/min and higher at 750 mm2/s and speed.

Do not install the pump with the flanges pointing down, and a vertical motor-down arrangement is not permitted. A separate system filter is essential with the no-filter AFI pumps, or the AFI-F version should be selected. The spec sheet also explains that a mechanical seal has a small standard leak, so a magnetically coupled ALLFUEL version is the alternative where no leakage can be accepted.

Related pumps and what to confirm

For another Allweiler lube-oil screw pump see the Allweiler TRILUB TRL V16-40R41 screw pump. Confirm the fuel type (for HFO or low-sulphur MGO or MDO the sheet recommends specific material codes), pump speed, working pressure and heating need before an RFQ. More pumps are in the pump category.

Documents and quotation

The ALLFUEL spec sheet can be downloaded on this page. Seven Star LLC is an independent supplier in Muscat; send your RFQ with the pump nameplate, fuel or oil grade, flow, pressure and motor details so the code can be checked against the manufacturer document.

Allweiler TRILUB screw pumps

TRILUB is Allweiler's name for a family of three-screw pumps built for lubricating and hydraulic oil service. One driven screw meshes with two idler screws inside a liner and moves the oil axially with little pulsation, which suits lube oil circuits of turbines, compressors, gearboxes and diesel engines. The listed TRL V16-40R41 is a complete pump from this family. Buyers who search for Allweiler oil pumps are usually looking for this kind of unit, in the GCC as elsewhere.

Ordering Allweiler pumps and parts: what we need

Send the full type designation and the serial or order number from the nameplate. For a complete pump add the oil grade and viscosity, flow, discharge pressure, speed and motor data. For parts, name the item needed, such as the screw set, liner, mechanical seal or bearing.