XPL
Directional dispersion
relief valve
Directional dispersion discharge solution for ventilation of LFL/toxic cargoes
Such a solution could reduce the danger of unwanted gases accumulating on the deck, reducing crew exposure to hazardous and noxious vapors. Additionally the alternative cargo vent solution reduces the demand for increased pressure settings for existing vessels and also minimizes the complexity of conversion for compliance.
The driving idea for developing a cargo vent system with directional dispersion discharge, is to expel the surplus gases from the cargo tank into an area with more natural ventilation.The new solution from Ventiq comprises a high velocity vent valve with a significantly increased exit velocity. In addition, the solution comprises the effect of angling the relief vent valve closer to 45 degrees leading harmful vapors further away from the ship and into a more natural vent zone to be diffused.
Controlled ventilation of cargo tanks carrying toxic products on OSVs
With reference to the Code for transport and handling of hazardous and noxious liquid substances in bulk on offshore support vessels, Resolution A.1122(30), Norwegian Maritime Authority (NMA) has acknowledged the challenges some of the requirements of the OSV Chemical Code has on existing vessels. The structural changes needed to comply with the requirements in 4.3.7 is a difficult task for the industry. The main rule in 4.3.7 still stands, but NMA has created an opening with regards to arrangements that can ensure that all toxic vapor discharge can be safely diverted away from the ship. The XPL cargo vent system will be supplied with an approved vacuum relief vent valve with location subject to designers’ preferences, limited to existing rules and requirements.
Minimize the risk of accumulated harmful gases on deck
The XPL solution is as of April 2022 accepted by Norwegian authorities as an alternative solution to the minimum set point in 4.3.7 of the OSV Chemical Code. CFD analyses of the solution show a noteworthy effect by increasing the speed and angling the dynamic flame arrester.
The XPL cargo vent system also has been put to the test and proven its flame arresting capabilities by the independent German notified body, Institute für Sicherheitstechnik (IBeXU).
For the effect of avoiding accumulation of harmful gases on the deck onboard an OSV, the directional dispersion discharge should be regarded as a doable and practical solution for ventilation of toxic vapors according to the OSV Chemical Code.
