A vent header is the head honcho in a venting system and always leads to outside air. Although a vent header is really not much different from a stack vent; it is named, so that it can be sized by different rules.

Example 1 - Vent header system suitable for applications where vessels contain materials that do not need to be stored under a controlled atmosphere and where the materials are compatible with each other. Example 2 - Vent header system for a simple inerted vessel.

6.4.1 Operating Pnnciples for Header Systems Handling Toxic Gases 1 19 Vent Header Systems Handling Flammable Materials 6.3.3 Operating Inerted 97 Vent Header Systems Handling Toxic Gases 6.4.2 Piping Design 120 6.4.3 Combined Relief Valve and Rupture Disk Devices 121 Reactive Systems 121 6.5.1 Reactive Systems Design Considerations 121

903.5 Vent headers. Stack vents and vent stacks connected into a common vent header at the top of the stacks and extending to the open air at one point shall be sized in accordance with the requirements of Section 916.1. The number of fixture units shall be the sum of all fixture units on all stacks connected thereto, and the developed length ...

Maintaining safe vent conditions; Understanding normal process operations, such as intentional routine controlled venting and emergency operations, like overpressure relief; Mitigating the impacts of end-of-line treatment devices, such as scrubbers, flares, and thermal oxidizers, on the vent header system; Complying with regulations

Spirax Sarco US Vent Heads separate condensate & safely discharge dry steam into the atmosphere with minimal maintenance. Find out more here

relief vent header is essential to ensure the safe and reliable operation of all pressure relief devices. This paper introduces the concept of credible relief scenarios that lead to one or more pressure relief devices

Vent Header Piping system that collects and delivers the relief gases to the vent stack. Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014.

What are the best practices for sizing hydrogen (H2) vent systems? Are there any established rules of thumb or specific criteria you recommend? For example, there is a guideline that limits the fluid velocity in vent headers—should this general criterion also be …

Boiler Flow Diagram With Drain and Vent Header The document contains a diagram of a boiler system with labels for the various components. It shows steam and water flow paths and includes headers, coils, pumps, and separators.