Page 31: of Marine Technology Magazine (May 2022)

ment, which causes a drop in fatigue re- via J-lay, S-lay and reel-lay, with the sistance, loss of toughness and sulphide goal of developing a recommended stress cracking. “Hydrogen induced practice (RP) as a supplement to the ex- cracking, as well, can be associated isting offshore pipeline standard (DNV-

WITH NEW with hydrogen,” he said. Some of these ST-F101), similar to an RP for CO

GAP FILL SONAR 2

S2 issues are similar to issues the upstream pipelines. 6205 industry is used to, for example is sour “The objective of the JIP is to develop

SWATH gas or ? uid service. However, they’re a a Guideline for Design, Construction “bigger deal” with hydrogen. and Operation of hydrogen Pipelines

BATHYMETRY

The established design code for hydro- which will be a supplement to the DNV & SIDE SCAN gen service is ASME B.31 12 and the Pipeline Standard,” said Jan Fredrik usual mitigation for embrittlement is Helgaker, project manager on the proj-

SONAR to stay with quite a low strength steel, ect. “For C-Mn steel pipelines, compo- e.g. X52, said Cooper. However, dam- nents and associated welds, it is well age like a gouge or a dent could be rela- recognized that hydrogen may promote tively more of a concern with hydrogen hydrogen embrittlement which could with other ? uids. have an adverse effect on the pipeline system integrity, and hence impacting

Revising standards both the design and operation of such

There is work underway to develop a pipeline systems. There are still uncer- design standard for offshore hydrogen tainties related to how hydrogen gas or pipelines. Last year, DNV launched a blends may affect the mechanical prop- joint industry project, H2Pipe. An exist- erties of these materials.” ing DNV standard for submarine pipe- A ? rst revision was shared in Decem-

TH lines (DNV-ST-F101) includes hydro- ber 2021, but there are still uncertainties 4 GENERATION.

gen as a transport product, but it’s felt around how hydrogen gas or gas blends 540B/850kHz, or 540B/1600kHz, or 850B/540kHz, or 850B/1600kHz additional considerations are needed to may affect mechanical properties of meet a target safety level now required. pipelines, so experimental test pro-

H2Pipe is focusing on blended and grams are being run to further develop pure hydrogen transport in 16-48-in. the guidance with an RP expected to be pipelines, installed or for installation published in 2023.

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