What is a  Mast Riser

By Rife Consultancy

This has nothing to do with mast, which is also very much a marine term, and alludes to those vertical erections over the main deck, which have been those supports for sails in older ships to various tower-like installations for telecommunication or other purposes in modern vessels.

A mast riser is essentially a device or, rather, a system to relieve the pressure accumulated inside the cargo tanks of oil tankers. Now by pressure, we mean what?

Most liquid substances, when entrapped or enclosed within a bound space, until and unless filling the entirety of the given space, emits a vapour that occupies the remaining volume within that space.

Design and Construction of a Mast Riser

The mast riser is nothing but a valve and comes under the category of cargo tank venting systems. It is a ventilation or venting component.

The mast riser is nothing but a valve and comes under the category of cargo tank venting systems.   It is a ventilation or venting component.

Now, speaking of inlets, there may be various piping inside the cargo tank that is sometimes merged into a single common outlet which ends above the main or exposed deck.

These pipes are venting systems that channel vapours accumulated inside the tanks or holds.

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