Concentric reducer

Overview

Concentric reducers, also called concentric size heads, are core diameter-reduction transition pipe fittings in pipeline systems. The central axes of the pipe openings at both ends completely coincide, and the overall shape is a symmetrical conical structure, used for centered and smooth connection of two sections of pipes with different diameters. The concentric reducers we produce are strictly manufactured according to domestic and international standards such as GB/T12459, GB/T13401, ASME B16.9, etc., with specifications covering the full diameter range of DN15-DN1800, suitable for the full series of pressure wall thickness grades from SCH10 to SCH160. Commonly used materials include carbon steel, stainless steel, alloy steel, etc., and the processes are divided into seamless hot pressing, welded rolling, and forging. The core characteristics of concentric reducers are centered symmetry, smooth flow passage, and low fluid resistance. The diameter reduction process will not produce biased flow, liquid accumulation, or vortex disorder, and can smoothly adjust the pipeline medium flow rate and pressure drop, stabilizing the pipeline operating pressure.

Key Features

Concentric reducers are manufactured using an integrated forming process, with an overall structure that is symmetrical and regular, centered on the axis, and with a smooth and unobstructed flow passage. The product has no biased flow, no dead corners, and no liquid or gas accumulation problems, and can reduce fluid resistance, stabilize medium flow rate, balance pipeline pressure, and reduce pipeline turbulent vibration, noise impact, and pipeline loss. All pipe fittings have uniform wall thickness, smooth inner and outer walls, and dense and firm welds, with no sand holes, no cracks, and no dent defects. The products are strictly produced according to both national and American standards, with standard bevels, precise dimensions, and strong interchangeability. Compared with eccentric reducers, concentric reducers have stronger structural stability and uniform force, and are suitable for diameter reduction connection of various vertical pipelines, gas pipelines, steam pipelines, instrument pipelines, and equipment inlet and outlet.

Applications

Concentric reducers are suitable for the vast majority of industrial and municipal pipeline transportation scenarios. In the industrial field, they are widely used in high-temperature and high-pressure process pipeline systems in petroleum refining, fine chemicals, thermal power generation, combined heat and power, heating pipe networks, long-distance natural gas transmission pipelines, coal chemical industry, and new energy plants, and are suitable for working conditions of stable transportation of steam, oil and gas, and clean media. In the municipal infrastructure field, they are suitable for urban central heating, tap water supply, sewage pipe networks, gas pipelines, and fire protection pipeline renovation and new construction projects, and are suitable for diameter reduction connection of large and medium-sized municipal main pipe networks. Equipment supporting scenarios include vertical diameter reduction connections at the inlet and outlet of boilers, heat exchangers, gas storage tanks, reactors, water pump units, and automated fluid equipment. At the same time, they can be used for plant circulating water pipelines, mining conveying pipelines, industrial overhead pipelines, and buried anti-corrosion pipeline systems. Because of their centered symmetry and no liquid or gas accumulation characteristics, they are especially suitable for dedicated scenarios such as vertical risers, gas pipelines, steam pipelines, and instrument sampling pipelines.

Specifications

Concentric reducers implement standards such as GB/T12459, GB/T13401, ASME B16.9, etc., with specifications covering DN15-DN1800, suitable for the full series of pressure wall thickness grades from SCH10 to SCH160. Commonly used materials include carbon steel, stainless steel, alloy steel, etc., and the processes are divided into seamless hot pressing, welded rolling, and forging. Customization is supported for non-standard diameter reduction ratios, unconventional long and short tapers, special thickened wall thickness, and oversized and undersized diameters. Special bevels, special end faces, and special length structures can be customized, suitable for imported equipment, foreign-funded projects, and overseas non-standard standards. Customization is supported for surface anti-corrosion treatments such as hot-dip galvanizing, cold galvanizing, sandblasting and rust removal, anti-corrosion paint, epoxy coal tar pitch, and plastic-lined anti-corrosion. Please contact us to confirm specific parameters such as material, wall thickness, and bevel form.

Purchasing & Delivery

We adopt a flexible and loose minimum order model. Conventional national standard and American standard general stock specifications support ordering from 1 piece, with no minimum quantity limit, suitable for engineering emergency repairs, sporadic replenishment, sample submission for inspection, and small sample procurement for equipment supporting. We have multiple specialized pipe fitting production lines and a large spot warehousing base, and concentric reducers have sufficient inventory and stable production capacity. Conventional standard stock specifications are shipped within 24 hours after order confirmation. All products adopt an export-grade standardized packaging process, are uniformly cleaned and polished before leaving the factory, and are sprayed with anti-rust oil on the surface. Small-diameter pipe fittings are equipped with special plastic dust-proof protective caps at both ends, medium and large-diameter products are wrapped as a whole with sealing protective film, and large batch items are reinforced and packed with solid wood pallets. Chinese and English foreign trade shipping marks, specification labels, batch identifiers, and quality inspection identifiers can be customized according to customer needs. Please contact us to confirm specific delivery time and packaging requirements.

Service & Support

We have established a complete pre-sales, in-sales, and after-sales full-process service system. Before sales, we provide free working condition analysis, selection guidance, parameter matching, and solution optimization services to help customers accurately select products and avoid waste from wrong purchases. During sales, dedicated personnel track the order throughout the process, synchronizing production progress, quality inspection results, packaging details, and shipping logistics information in real time. All products undergo multiple strict quality inspections before leaving the factory. After sales, we promise unconditional return and exchange for legitimate quality problems. For product quality problems such as substandard materials, dimensional deviations, process defects, and welding defects, we bear all freight and losses, with free replacement and full after-sales service. We provide free technical consultation, installation guidance, and pipeline supporting Q&A services for life. Long-term cooperative customers have exclusive files established and enjoy priority production scheduling, priority shipping, and priority after-sales privileges.