DVS 2205-4 2020-01 PDF

Full title and description

STB DVS 2205-4 2020-01 — Calculation of tanks and apparatus made of thermoplastics — flange connections. This technical code specifies calculation and design principles for circular flange connections and related welded flange/collar details for tanks and apparatus constructed from thermoplastic materials (for example PE‑HD, PP, PVC, PVDF). It is the 2020 edition of the DVS guideline covering pressure‑loaded thermoplastic flange connections and constructive details for welded flanges and welded collars.

Abstract

This guideline provides rules for the structural design and calculation of circular flange connections used in thermoplastic tanks and apparatus. It covers types of welded flanges and collars (pre‑welded and weld‑on variants), required design assumptions for pressure and temperature loading, and calculation methods tailored to common thermoplastic materials. The document updates and replaces earlier editions of DVS 2205‑4.

General information

• Status: Published / Active.
• Publication date: 2020-01 (January 1, 2020).
• Publisher: DVS (Deutscher Verband für Schweißen und verwandte Verfahren e. V.) / DVS‑VERLAG (technical code publisher).
• ICS / categories: 23.040.45 (Plastics fittings / thermoplastic fittings and connections).
• Edition / version: 2020-01 (current edition replacing the 1988 edition).
• Number of pages: 14 pages (typical PDF/printed length as published).

Scope

The guideline applies to the design and strength calculation of circular flange connections on tanks and apparatus made from thermoplastics subjected to internal pressure and related mechanical loads. It is intended for welded flange and collar configurations (pre‑welded flanges, weld‑on flanges, welded collars) and gives material‑specific calculation approaches for common thermoplastics such as high‑density polyethylene (PE‑HD), polypropylene (PP), polyvinyl chloride (PVC) and polyvinylidene fluoride (PVDF). The document addresses geometry, loading assumptions and verification checks needed to demonstrate structural integrity of flange joints in process and storage applications. It does not replace rules for metal flanges or cover every bespoke joint type outside the circular flange families described.

Key topics and requirements

• Design and calculation methods for circular thermoplastic flange connections.
• Types of welded flange and collar details (pre‑welded, weld‑on, welded collars) and constructive recommendations.
• Material considerations and characteristic values for PE‑HD, PP, PVC, PVDF (creep, long‑term behavior, temperature dependence).
• Pressure and temperature design assumptions, safety factors appropriate for thermoplastics.
• Verification checks for flange strength, deformation and sealing under service loads.
• Reference to related DVS 2205 parts for characteristic values and other tank types.

Typical use and users

Used by mechanical and process engineers, tank designers, fabricators and welders of thermoplastic equipment, inspection and certification bodies, and procurement/specification teams in chemical processing, water & wastewater, storage, food & beverage (where applicable), and other industries that employ thermoplastic tanks and pressure‑bearing apparatus. Typical applications include design of process vessels, storage tanks and piping terminations where flange connections are required.

Related standards

Part of the DVS 2205 technical code family (calculation of tanks and apparatus made of thermoplastics). Related parts include DVS 2205‑1 (characteristic values), DVS 2205‑2 (vertical round, non‑pressurised tanks), DVS 2205‑3 (welded joints / design of welded joints) and supplemental leaflets providing material property data for specific polymer groups. Earlier editions of DVS 2205‑4 (for example the 1988 edition) have been superseded by the 2020 edition.

Keywords

thermoplastic tanks, flange connections, welded flanges, welded collars, PE‑HD, polypropylene, PVC, PVDF, DVS 2205, tank calculation, pressure vessels (thermoplastic), design code.

FAQ

Q: What is this standard?

A: It is DVS 2205‑4 (2020‑01), a DVS technical guideline for the calculation and design of flange connections on tanks and apparatus made of thermoplastics.

Q: What does it cover?

A: It covers structural design and calculation methods for circular thermoplastic flange connections, descriptive constructive details for welded flanges and collars, and the checks needed to verify strength and deformation under pressure and service loads.

Q: Who typically uses it?

A: Mechanical/process engineers, thermoplastic fabricators, welding specialists, inspection and certification engineers, and specification writers in industries using thermoplastic vessels and equipment.

Q: Is it current or superseded?

A: The 2020‑01 edition is the current published edition that replaces earlier editions (for example the 1988 edition). Users should verify whether any later supplements or revisions have been published for related DVS 2205 parts.

Q: Is it part of a series?

A: Yes — it is part of the DVS 2205 series (calculation of tanks and apparatus made of thermoplastics). Other parts address characteristic values, non‑pressurised tanks, welded joint details and material‑specific supplements.

Q: What are the key keywords?

A: Thermoplastic flange, welded flange, flange calculation, PE‑HD, PP, PVC, PVDF, DVS 2205, tank design, pressure‑bearing thermoplastic equipment.