KRACHT SVC Screw Type Flow Meter

Overview

The KRACHT SVC is a screw type flow meter designed for high-precision, pulsation-free volumetric measurement of liquids, and it is particularly suited to highly viscous media and fluids carrying abrasive fillers. KRACHT GmbH, the German fluid technology specialist that belongs to the Atlas Copco Group, offers the KRACHT SVC in nominal sizes 4, 10, 40, 100 and 250, covering measuring ranges from 0.4 l/min up to 3 750 l/min. Working pressures reach 250 bar on the standard versions and 480 bar on the high-pressure versions, media temperatures range from -40 to 210 °C, and the typical measuring accuracy is ±0.2 % of the measured value from a viscosity of 20 mm²/s.

Seven Star LLC supplies the KRACHT SVC to fuel, lubrication, process and test bench users across the Sultanate of Oman and the GCC, with engineering support in Muscat. Our engineers help match the nominal size, pressure version, seal material and electronics to the duty, whether the meter is destined for a bunkering skid, a refinery blending line or a hydraulic test rig in Sohar, Duqm or Salalah.

Measuring Principle of the KRACHT SVC

Inside the KRACHT SVC, a measuring system of precision screw spindles is set in rotation by the flowing liquid according to the displacement principle, and the liquid passes through the device in an axial direction. Because flow enters and leaves the meter with hardly any deflection, the pressure loss is comparatively low, and the measuring principle itself causes no pressure or flow pulsation. No settling sections are needed on the inlet or outlet side, so machines and plants can be designed more compactly, and all moving parts are lubricated by the measured medium.

A sensing wheel mounted on one spindle is scanned by two contact-free sensors as standard. The pre-amplifier in the plug converts the sensor signal into a square-wave output, and dual-channel scanning provides both higher resolution and detection of the flow direction. As general engineering background, screw spindle meters combine the viscosity tolerance of positive displacement instruments with an almost continuous flow path, which is why they are chosen for large flows of heavy oils, where gear meters would become bulky and turbine meters would lose accuracy.

Engineering Design of the KRACHT SVC

The housing and flanges of the KRACHT SVC are made from spheroidal cast iron EN-GJS-400-15, the measuring spindles and ball bearings from heat-treated steel, and the O-rings are available in FKM, EPDM, FEP or low-temperature FKM. Connections are offered as pipe thread, SAE flange or DIN flange, the meter can be mounted in any position and the flow direction is free, with a preferred direction only on encoder versions. The maximum permissible pressure loss is 25 bar temporarily and 7 bar permanently at 50 % of maximum flow, and the sound pressure level stays at or below 52 dB(A).

The standard electronics run on 24 V or, in reduced-voltage versions, 12 V, with PNP or NPN square-wave output, a 90-degree phase offset between channels and IP 65 protection. KRACHT also offers encoder versions with up to 2 500 pulses per revolution for maximised resolution, IO-Link versions that calculate measured values internally, analogue versions with a 4 to 20 mA signal, versions with remote electronics for extreme temperatures, and ATEX/IECEx explosion-proof versions.

Key Features of the KRACHT SVC

Engineers specify the KRACHT SVC for the following reasons:

• Measuring ranges from 0.4 l/min on the high-pressure size 4 up to 3 750 l/min on size 250, covering small dosing streams and large transfer flows.
• Typical measuring accuracy of ±0.2 % of the measured value from 20 mm²/s and repeatability of ±0.05 %, traceable to DAkkS.
• Pulsation-free measuring principle with very low pressure drop and very low noise.
• Standard versions rated to 250 bar on sizes 10 and 40, with high-pressure versions of sizes 4, 10 and 40 rated to 480 bar.
• Media temperatures from -40 to 210 °C and viscosities up to 2 500 000 mm²/s depending on flow.
• Suitable for highly viscous media with abrasive fillers, and insensitive to contamination.
• Encoder versions reaching up to 247 463 pulses per litre with four-fold evaluation for test bench precision.
• Electronics choices including standard, encoder, IO-Link, analogue 4 to 20 mA and ATEX/IECEx.

Industrial Applications

KRACHT names fuel consumption measurement, dosing systems, process technology and test bench construction as the main fields for the KRACHT SVC. In the Omani and GCC market that translates into heavy fuel oil and marine gas oil consumption monitoring on ships and power barges, lubricating oil and seal oil flow measurement on rotating equipment, bitumen, resin and additive dosing in refinery and petrochemical units, and endurance and performance testing of pumps, motors and valves in hydraulic workshops serving the oil and gas sector.

Seven Star LLC supplies the KRACHT SVC with the appropriate evaluation electronics and supports buyers with sizing against flow, viscosity and allowable pressure loss. Where a site also needs smaller or more compact meters, we can supply the VCA aluminium gear flow meter and the VCM gear flow meter, and for fluid transfer duties the KF Series modular gear pump from the same manufacturer.

Technical Specifications

The following KRACHT SVC data is taken from the manufacturer datasheet; confirm final values against the selected size and type key:

How to Order

Seven Star LLC can quote the KRACHT SVC as a new installation or as a like-for-like replacement for an existing meter. Send us the fluid, viscosity range, normal and maximum flow, pressure, temperature and required signal, or the type key from the nameplate, and our team in Muscat will prepare a formal quotation and deliver to your site in Oman or the GCC. Download the manufacturer datasheet from this page for dimensions, pressure loss curves and the full type key.