dsys 2014 activity data base - european diving ...edtc.org/2015/olavhauso.pdfdsys 2014 activity data...

PTIL/PSA

EDTC – National report Norway

DSYS 2014 Activity data base

High activity of saturation diving in 2014, accumulating 134.000 manhours in sat.

Representing an increase of approx. 40% compared 2013

Comparable level of activity 21 years back.

No surface oriented diving reported

3 near accidents

2 reports; cut in hand and muscular pain

EDTC Gdynia October 2015

PTIL/PSA

News from the Petroleum Safety Authority,

Norway (PSA)


PTIL/PSA


Length of diver umbilicals

Increased use of long umbillicals

Clarification letter to the industry Regulatory requirements

Use of Regulations and Standards (NORSOK U-100)

Risk issues

A holistic use of regulations and standards

Precautionary principle

Principles of risk reduction

Handling of non-conformance issues


PTIL/PSA


Conclusion in letter to the industry

PSA is of the opinion that the use of long diver

umbilicals (> 45 meters) as a compensating measure

for lack of space for the DSV or inadequate passage

for the diver to the work site, normally is in breach of

the Activities Regulation § 93 for Manned Underwater

Operations.


PTIL/PSA

Surface diving decompression tables –

a comparison

EDTC meeting - Gdynia October 2015

PTIL/PSA


a comparison

Van Liew and Flynn (2005):

«From collective experience, we presume that for a given

depth and bottom time (BT), total decompression time

(TDT) is by far the most important determinant of DCS

risk»

NUI rapport 2014-01


PTIL/PSA


a comparison

Dekompresjon – overflateorientert dykking

Compare surface diving tables wrt Total decompression time

Profile of decompression

Only in-water decompression, no surface decompr. or Nitrox.

Relevant sources for comparisson; NDTT (Norway)

DCIEM (Canada)

United States Navy 6 (USA)

MT92/BGV C23 (France/Germany)

HSE/BTL (UK, only bottom time limits)

Technip (Worldwide)

Subsea 7 (Worldwide)


PTIL/PSA

40

60

80

100

120

140

160

180

200

220

240

10 11 12 13 14 15 16 17 18 19 20

Max

bo

tto

m t

ime

[min

]

Bottom depth [msw}

No-stop decompression limits [min] vs depth [msw]

NDTT

USN6

NEDU-2012-01

German BGV C23 2001

DCIEM92

HSE BTL

0.2% CNS DCS

Hempleman's formula


PTIL/PSA

0

5

10

15

20

25

30

35

26 28 30 32 34 36 38 40 42 44 46 48 50 52 54

Max

bo

tto

m t

ime

[min

]

Bottom depth [msw}

No-stop decompression limits [min] vs depth [msw]

NDTT

USN6

NEDU-2012-01

German BGV C23 2001

DCIEM92

HSE BTL

0.2% CNS DCS

Hempleman's formula


PTIL/PSA EDTC meeting - Gdynia October 2015

PTIL/PSA


a comparison

US Navy manual rev 6, «GENERAL RULES FOR THE USE OF AIR

DECOMPRESSION TABLES»:

9-6.1 Selecting the Decompression Schedule. “To select the proper

decompression schedule, record the bottom time and the maximum depth

attained by the diver.

Enter the table at the exact or next greater depth and at the exact or next

longer bottom time. The new air tables are designed to provide safe

decompression even for divers who work hard on the bottom or are

exceptionally cold during decompression. It is not necessary to select

the next deeper or next longer decompression schedule under these

conditions as in the past."


PTIL/PSA


a comparison

Conclusion

It seems evident that the Norwegian Diving and Treatment

Tables gives radical advise for decompression from surface

oriented diving

PSA is of the opinion that this fact must be evaluated by the

parties of the petroleum activity

PSA have invited the industry to join/lead a tripartite group to do

this work and recommend a way ahead –Result to be an advise

to Norsok for the U-100 standard


PTIL/PSA



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