Flowserve Durco Mark 3 ANSI Chemical Process Pump

The Flowserve Durco Mark 3 is a single-stage, overhung, end-suction centrifugal pump built to ANSI/ASME B73.1 standard — the defining specification for chemical process pumps used in the petrochemical, chemical, and general processing industries across North America, the GCC, and globally wherever US engineering design standards are applied. The Mark3-1.5x1-6 model designates a 1.5-inch suction, one-inch discharge, and six-inch maximum impeller — a small-to-medium hydraulic frame that covers the high-head, moderate-flow chemical injection, reagent circulation, solvent transfer, and acid dosing duties that are fundamental to SABIC's polyethylene, polypropylene, and specialty chemical manufacturing processes at the Jubail Industrial City complex. The back-pullout design allows the rotating element to be removed for inspection and seal replacement without disconnecting the pump from its piping, minimising maintenance time in the congested pipe racks and chemical buildings of SABIC's Jubail plants.

The Durco Mark 3 casing is available in the widest material range of any ANSI pump on the market — encompassing Type 316L stainless steel, Alloy 20, Hastelloy C-276, Titanium Grade 2, and a range of fluoropolymer-lined options — enabling engineers to specify a single pump model for the diverse chemical inventory found in SABIC's integrated petrochemical complexes without changing hydraulic frames or spare parts interchangeability. The standard stuffing box accommodates API 682-compliant single and dual cartridge mechanical seals including the Flowserve BX single seal and ISC2-PP dual seal described elsewhere in this catalogue, and the large-bore seal chamber satisfies the API 682 requirement for adequate flush flow and face cooling in corrosive chemical services. ANSI B73.1 dimensional standardisation means Mark 3 replacement pumps and parts are interchangeable with competitor ANSI B73.1 pumps, protecting the plant from single-source lock-in and enabling open competitive procurement.

SABIC and its wholly owned affiliates at Jubail — including SABIC Petrochemicals, Ibn Rushd, Ibn Zahr, Al-Jubail Petrochemical Company (KEMYA), and Saudi Kayan Petrochemical — are major users of Flowserve Durco ANSI chemical process pumps, specifying the Mark 3 family across polymer additive injection, catalyst handling, inhibitor dosing, water treatment chemical injection, and utility chemical services throughout the integrated complex. The Mark 3's resistance to corrosive chemicals in Hastelloy and Alloy 20 variants is particularly valued at SABIC's specialty chemical units handling organic acids, caustic soda, and chlorinated solvents where carbon steel pump failures from corrosive attack generate unplanned maintenance costs and safety incidents. Flowserve's global ANSI pump installed base exceeds one million units, providing a mature spare parts and repair ecosystem that reduces total cost of ownership for asset-intensive Saudi industrial operators.

Razz Middle East is the authorised Flowserve ANSI pump distributor for Saudi Arabia, with Mark 3 pump units, mechanical seal kits, impeller and wear ring sets stocked locally for rapid dispatch to SABIC and Sadara facilities in Jubail and to ARAMCO maintenance departments. We provide complete chemical process pump package engineering including motor selection, baseplate design, coupling specification, and ANSI B73.1 compliant dimensional drawings for insertion into SABIC and ARAMCO vendor data requirement (VDR) submittals. Our materials engineers advise on corrosion-resistant alloy selection for specific chemical services based on Flowserve's corrosion resistance database and SABIC's proprietary chemical service classification tables.