REMARK:

As per DNGL-OS-E402; Chapter 3; Section 3; Para 5 Piping System; 5.3 Chambers; 5.3.1  In addition to the requirements in [5.1.5] all penetrations for lines designed for gas distribution (e.g. supply, exhaust and equalisation) shall be fitted with non-return valves or flow fuses as appropriate for the direction of gas flow. Lines specifically designed for non distribution purposes (e.g. analysis) shall be kept to the minimum diameter possible and limited to a maximum of 5 mm.

As per IMCA D 024 Rev. 2; DESIGN for Saturation (Bell) Diving Systems; Section 3 – Surface Compression Chamber; 5.22 ECU; If an external environmental control unit with large diameter piping is fitted then it should be fitted with a non-return valve for inlet and flow fuse for exhaust at the hull penetration respectively. These can be fitted either externally or internally and are normally in place of the normal hull protection valve at that point (see 5.6 above)

OPTIONAL:

Different size and connection type can be manufacturer upon request.

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