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Analysis of the OH Classification for IS-Type Single-Stage Centrifugal Pumps
Analysis of the OH Classification for IS-Type Single-Stage Centrifugal Pumps
In the day-to-day tasks of pump selection and equipment documentation organization, many professionals often wonder: for a standard IS‑type single‑stage, single‑suction centrifugal pump, does it fall under API pump configuration class OH1 or OH2? According to industry‑wide standards, the answer is clear: the conventional standard. IS-type single-stage centrifugal pump All are of the OH1 type and do not belong to the OH2 type.
To distinguish between the two, it is first necessary to clarify the two distinct sets of equipment standards. IS centrifugal pumps are general‑purpose units designed in accordance with domestic standard specifications for water pumps and are widely used in civil and typical industrial applications, primarily for conveying clean water at ambient temperatures. By contrast, the structural classification of OH1 and OH2 originates from the API 610 standard for petrochemical‑specific pumps; this represents a standardized categorization system for pump designs that has been universally adopted in the industrial sector. In everyday practice, the structural classification of ordinary water pumps is also based on this same framework.
The most fundamental difference between OH1 and OH2 lies in the pump’s support and mounting configuration. OH1 is a horizontal cantilever pump with base‑foot support, resting on its bottom feet for stable installation. Its simple structure and ease of installation make it well suited to typical ambient‑temperature, atmospheric‑pressure operating conditions—features that closely align with the structural design and application scenarios of standard IS pumps and form the core rationale for classifying IS pumps as OH1 type.
The OH2 type employs a centerline‑supported structure, using the pump casing’s flow‑path centerline as the load‑bearing reference. Its key advantage is its ability to counteract thermal deformation and displacement of the pump housing under high‑temperature operating conditions, ensuring stable equipment performance. This design is commonly used in demanding applications such as petrochemical processes and high‑temperature operations, and is typically found in specialized chemical pumps like the CZ and ZE series—distinctly different from the IS pump’s conventional design for ambient‑temperature water transfer.
Only specially modified, center‑line‑supported, and fully compliant with API 610 standards custom‑designed IS pumps may be classified as OH2 type; however, such pumps no longer fall under the category of standard IS pumps. Furthermore, S‑ and SH‑type single‑stage, double‑suction, mid‑open pumps are not part of the OH cantilever pump series; they belong to the BB class of double‑ended bearing pumps. In practice, it is essential to distinguish between these categories to avoid misclassification.
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