Confined Space - Davits - Descent by winch (1a)

THERE ARE FUNDAMENTALLY 2 WAYS OF GOING DOWN AND UP:
  • BY WINCH, SO PEOPLE HANG ON A CABLE. THIS IS DISCUSSED HERE IN CASE 01-A.
  • BY LADDER, LOOSE LADDER, ROPE LADDER ETC. SEE CASE 01-B.

GENERAL REMARK:
ASSISTING SAFETYGUARDS: ANYONE COMING CLOSE TO THE MANHOLE NEEDS TO WEAR PROPER FALL PROTECTION.
THIS IS NOT DISCUSSED IN FURTHER DETAIL HERE. SEE THE SITUATION CASE WHICH COMES CLOSEST TO YOUR CASE, AND MAKE YOUR CHOICE OF THE PPE BEST SUITED FOR YOUR JOB.

(+) A. ANCHOR POINT / STRUCTURAL ANCHOR FACILITY

Anchor points or structural anchor facilities have to meet the strength requirements related to EN-795(2012).
Static strength test: 12 kN. Keep in mind that a safety factor of 2 is a normal minimal requirement. Manufacturers have all kinds of requirements, varying from 12 kN to 25 kN and incidentally even more.
We advise to use 24 kN as a basic guiding idea for discussing and analyzing strength requirements ( = minimal breaking strength). From there you may apply them to specific cases.
This can have consequences for the choice of anchor systems and also the choice of ppe. For more guidance, please contact us.

For horizontal lifeline systems a safety factor of 2 with regard to the mandatory shock impact calculations is necessary. This implies that stronger structural constructions may be necessary for the safety of the system.

In case of questions or doubts: please call for advice. It is possible to meet requirements with additional measures of the choice of ppe items, or smart, specific constructional measures. But this needs more than just clicking buttons on a website.

(+) B. BODY SUPPORT

Harness:
Basic requirement for any harness is conformity to EN-361.
If you need to do work positioning additional conformity to EN-358 is needed.
Suspension work implies harness conformity to EN-813.
SPECIFIC REMARK FOR THIS CASE:
A MORE PROFESSIONAL AND COMFORTABLE HARNESS IS NEEDED, PEOPLE HANG IN IT EVERY TIME THEY GO UP, DOWN OR STAY SOMEWHERE HALF-WAY TO DO THEIR WORK IN A HANGING POSITION. DEPENDING ON THE KIND OF OPERATIONAL WORK A SUSPENSION HARNESS (EN-813) WILL BE NECESSARY.

(+) C. CONNECTOR

Connecting devices:
Lanyards, work positioning lanyards, fall arrest blocks, ropes with fall arresters, karabiners, ascenders, descenders, etc.. Please see the various products you can choose.
SPECIFIC REMARK FOR THIS CASE:
A BACKUP FOR FALL ARREST, WITH A RESCUE FACILITY IS MANDATORY. FOR INSTANCE: A FALL ARREST BLOCK WITH A RESCUE WINCH (EN-1496). JUST FALL ARREST IS NOT SUFFICIENT; YOU MUST BE ABLE TO HOIST OR LOWER THE FALLEN PERSON IN ORDER TO BRING HIM INTO SAFETY.

(+) D. DESCENT, Rescue or lifting

Rescue of a fallen person: Basic principle is that a rescue must be done within 15 minutes after a fall. The capacity to perform rescue after a fall is a basic legal responsibility.
SPECIFIC REMARK FOR THIS CASE:
THE WINCH MUST BE EXPLICITLY ALLOWED FOR HOISTING PERSONS, AND CE-MARKED UNDER THE EUROPEAN MACHINE DIRECTIVE.

(+) E. EDUCATION

Instruction / training. These are basic legal responsibilities. We can train and instruct you wherever you need it: at one of our training centres, or at your location, or wherever worldwide. Please contact us.

(+) F. FACTS

How to make sure that your safety measures are up to date: Records and documents must be stored adequately, with regard to legal responsibilities and product liability of the manufacturers / suppliers.
Periodical inspection: Anything related to personal fall protection has to be inspected at least 1 x every twelve months.

 
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