Sundyne chemical and sealless pumps — official representative in Ukraine

Sundyne is a US manufacturer of centrifugal pumps and compressors for chemical, refining, petrochemical and power plants. The headquarters is in Arvada (Colorado, USA). Since 2025 the company has been part of Honeywell. Steiner Ukraine is the official representative of Sundyne in Ukraine: we select pumps for the process conditions, supply equipment and spare parts, and provide service.

Which Sundyne pumps Steiner Ukraine supplies

The product lines differ in drive type, shaft sealing method and the standard they are built to.

How an integrally geared Sundyne pump achieves high head

In Sundyne Integrally Geared pumps the motor drives the input shaft of a speed-increasing gearbox. The gearbox raises the speed, so the impeller on the high-speed shaft turns much faster than the motor.

The head of a centrifugal impeller rises with rotational speed. As a result, one impeller delivers the head that a conventional pump needs several stages to reach.

The hydraulics are matched to the specific duty point by combining the impeller, diffuser and inducer (a screw-type wheel at the inlet). This sets the efficiency, curve shape and required net positive suction head (NPSH). Why NPSH matters is explained in the article “Pump cavitation: symptoms, causes and how to eliminate it”.

How a sealless magnetic drive pump works

ANSIMAG and HMD Kontro pumps and the LMV-801S model have no mechanical shaft seal. Torque from the motor is transmitted through a magnetic coupling. The outer magnet rotor turns outside the casing, the inner one in the pumped liquid. A sealed containment shell separates them.

The liquid stays entirely inside the casing. There is no seal to wear and no seal support system.

The main risks for this type of pump are dry running, low-flow operation and magnet decoupling. A power monitor in the motor control centre protects against them: it tracks power consumption and trips when it leaves the set limits. For additional protection, the pump can be fitted with secondary containment in case the containment shell is damaged.

How seals for aggressive media differ is described in the article “How seals differ for pumps handling aggressive liquids”.

What API 610, API 685, ASME B73.3 and ISO 2858 mean

• API 610 (ISO 13709) — centrifugal pumps for the petroleum, petrochemical and natural gas industries. The type code indicates the overhung pump design: OH3 — vertical pump with a separate bearing housing; OH5 — vertical pump rigidly coupled to the motor; OH6 — pump with an integral gearbox.
• API 685 — sealless centrifugal pumps for the petroleum, heavy-duty chemical and gas industries. The standard was introduced in 2000; the second edition was published in February 2011.
• ASME/ANSI B73.3 — US standard for sealless chemical process pumps with unified connection dimensions.
• ISO 2858 — international standard for the connection dimensions of end-suction pumps.

Thanks to unified dimensions, a mechanically sealed pump can be replaced with a sealless one without changing the piping or baseplate.

Why mains frequency of 50 Hz matters when selecting a Sundyne pump

Sundyne publishes performance data separately for 60 Hz (USA) and 50 Hz supply. At 50 Hz the motor runs slower, so the flow and head of a direct drive pump are lower than in the 60 Hz data.

The supply frequency in Ukraine is 50 Hz. The series pages state which frequency the figures refer to. We determine the duty point using the manufacturer’s 50 Hz curves.

What data is needed to select a Sundyne pump

• liquid, its composition and concentration;
• temperature: operating, minimum, maximum;
• density, viscosity, vapour pressure;
• flow: rated, minimum, maximum;
• head or discharge pressure;
• suction pressure and available NPSH (NPSHa);
• solids content and particle size;
• required standard (API 610, API 685, ASME B73.3, ISO 2858) and ATEX explosion protection;
• power supply parameters.

How these parameters affect the choice is explained in the article “How to select a pump for aggressive and chemically active liquids”.

Supply and service of Sundyne pumps in Ukraine

Steiner Ukraine selects the model and configuration to the technical specification and supplies pumps and spare parts for pumps. We also provide installation, commissioning and service. Prices are quoted on request once the parameters are agreed.

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