API St 623-2021 (2024) PDF

Full title and description

API STD 623:2021 — Steel Globe Valves — Flanged and Butt‑welding Ends, Bolted Bonnets (Second Edition, with Erratum/Errata incorporated 2024). This API standard defines design, materials, construction and testing requirements for heavy‑duty bolted‑bonnet steel globe valves used in petroleum refining and related process applications where heavier wall sections and larger stem diameters are required.

Abstract

This standard specifies requirements for a heavy‑duty series of bolted‑bonnet steel globe valves (flanged and butt‑welding ends) intended for petroleum refinery and related process service, addressing design, pressure/temperature ratings, materials, testing, inspection, marking and purchaser documentation. The published edition of 2021 has an incorporated erratum issued in 2024 (ERR 1:2024).

General information

• Status: Current (2021 edition with Errata 1 incorporated 2024).
• Publication date: Original second edition published 27 January 2021; Errata/ERR 1 incorporated edition published 1 April 2024.
• Publisher: American Petroleum Institute (API).
• ICS / categories: Valves — Globe valves; ICS 23.060 (Valves), in particular 23.060.10 (Globe valves) / 23.060.01 (Valves in general).
• Edition / version: Second edition (API STD 623:2021) — now issued with ERR 1:2024 (incorporated errata).
• Number of pages: Listed as 39 pages for the incorporated‑errata edition (some vendor listings reference 42 pages for the original listing).

Scope

Applies to heavy‑duty cast/forged steel globe valves with bolted bonnets, covering nominal sizes and pressure classes typical for refinery service. The scope includes design and dimensional requirements (end connections and face‑to‑face), minimum wall and stem diameters, material selection and permitted material combinations, manufacturing controls, pressure/temperature ratings, inspection and testing (including pressure tests), marking, packaging and purchaser information. The standard is intended for valves where increased strength and durability are required versus conventional ASME valve practice.

Key topics and requirements

• Design: bolted‑bonnet construction, body/bonnet joint gasketing, backseat and secured packing gland boltings, disc guidance where required.
• Mechanical dimensions: face‑to‑face (ASME B16.10) and end connection compatibility (ASME B16.5/B16.25 where applicable) called out for flanged and butt‑weld ends.
• Materials: specified steel grades and trim combinations; tabulated material pairing guidance and minimum wall/stem diameters for heavy‑duty service.
• Pressure‑temperature ratings: defined ratings and tables for ASME class equivalence and refinery operating conditions.
• Testing and inspection: mandatory pressure testing, leakage criteria and acceptance, non‑destructive examination where required (references to API/ASME test practices such as API 598 for valve testing are commonly used in conjunction with this standard).
• Emissions and sealing options: provisions for low‑emission packing or bellows seals and cross‑reference to fugitive emission guidance (API 624 and related practices) where specified by purchaser.
• Documentation, marking and purchaser information: purchaser‑specified data annex and mandatory marking/identification for traceability and procurement.

Typical use and users

Used by valve manufacturers, refinery and petrochemical process engineers, procurement/specification teams, inspection and quality assurance personnel, third‑party inspectors, and EPC contractors. Typical applications are isolation and control in hydrocarbon processing, heavy service where erosion/corrosion or high mechanical loads require thicker‑walled, heavy‑duty globe valves.

Related standards

Commonly used or cross‑referenced standards and documents include API 598 (valve inspection and testing), API 624 (fugitive emissions testing for valve packing/bellows where applicable), ASME B16.10 (face‑to‑face dimensions), ASME B16.5 / B16.47 (flanges), ASME B16.25 (butt welding ends), API RP 615 (valve selection guidance) and ISO/industry test references such as ISO 5208 (pressure testing). Users typically apply API STD 623 together with these dimensional, testing and materials standards.

Keywords

API 623, steel globe valves, bolted bonnet, flanged ends, butt‑weld ends, refinery valves, valve testing, pressure‑temperature ratings, valve materials, API errata 2024.

FAQ

Q: What is this standard?

A: API STD 623:2021 is an American Petroleum Institute standard that specifies requirements for heavy‑duty bolted‑bonnet steel globe valves used primarily in refinery and related process applications; the 2021 second edition has had Errata 1 issued and incorporated in 2024.

Q: What does it cover?

A: It covers valve design and construction (bolted bonnet globe valves), dimensional and end‑connection requirements, minimum wall and stem diameters for heavy service, materials and trim combinations, pressure/temperature ratings, testing and inspection, marking and purchaser information requirements.

Q: Who typically uses it?

A: Valve manufacturers, refinery and petrochemical engineers, procurement/spec writers, quality/inspection staff, test houses and EPC contractors specifying or supplying heavy‑duty globe valves for hydrocarbon processing.

Q: Is it current or superseded?

A: The second edition (API STD 623:2021) is the base document; an incorporated Erratum (ERR 1:2024) has been published — the incorporated‑errata edition is the current published version. Users should refer to the edition with errata incorporated for the latest text.

Q: Is it part of a series?

A: API STD 623 is one of several API product/valve standards and is used alongside other API and ASME valve and test standards (for example API 598, API 624, API RP 615 and ASME B16.x series) relevant to valve design, testing and selection.

Q: What are the key keywords?

A: Steel globe valves; bolted bonnet; flanged ends; butt‑weld ends; refinery valves; heavy‑duty valve design; API 623; valve testing; pressure‑temperature ratings; valve materials.