0027/nd guidelines for Marine Lifting and Lowering Operations

GUIDELINES
 
FOR
 
MARINE
 
LIFTING
 
&
 
LOWERING
 
OPERATIONS 
0027/ND Rev 11 
 
Page 53 of 84 
15.2.7 
The sling/grommet certificate should indicate as a minimum: 

unique identification number/s, 

name of manufacturer, 

date of manufacture, 

clearly defined MBL, 

diameter and length (nominal and actual/measured), 

type of construction, 

applied proof load (if applicable) 

Modulus of Elasticity (E), if applicable – see Section 14.2.10. 
15.2.8 
In addition to Section 15.2.7, the following information for cable laid slings or grommets should be 
included: 

certificate number/s for component unit ropes (certificate/s to be enclosed), 

MBL of component ropes, 

MBL of sling or grommet. 
15.2.9 
In addition to Section 15.2.7, the following information for fibre slings or grommets should be included: 

minimum bend diameter, 

reject criteria, 

maximum working temperature,

applied proof load (if applicable). 
15.2.10 
Each sling or grommet should be clearly identified with reference to the corresponding certificate. 
15.2.11 
Slings and grommets shall be discarded, or subject for revalidation/re-certification according to 
15.2.15, if any of the following are applicable: 

apparent damage or deterioration, 

indications of previous overloading, 

unknown internal condition, 

unreliable handling or storage history. 
15.2.12 
Where 9-part slings are proposed for use in a lifting system, certification of these slings shall be given 
special consideration.
15.2.13 
For slings and grommets used for offshore and inshore lifting, the inspection report signed by a 
recognised Certifying Body should be valid for 2 years. The exception to this are slings and grommets 
used for general deck activities on the crane vessel for which the onshore requirements are applicable 
provided there are no over the side lifts in which case the offshore requirements still apply.
15.2.14 
For slings and grommets used for onshore lifting, the inspection report signed by a recognised 
Certifying Body should be valid for 4 years. The exceptions to this are slings and grommets used for 
the load-out operations to/from a vessel of structures and any essential equipment required for its 
subsequent installation, for which the offshore requirements are applicable.
15.2.15 
Where revalidation/re-certification is required, the slings and grommets shall be thoroughly inspected 
and evaluated by a competent person from a recognised sling manufacturer and / or Certifying Body. 
Destructive testing and issuance of new certificates, when required, shall be done by a recognised 
sling / grommet manufacturer and/or Certifying Body. Revalidation/re-certification procedures should 
be according to a recognised code and normally include the elements indicated below: 

Slings and grommets subject for revalidation should be properly cleaned. Random opening 
should be carried out to check for internal condition and corrosion. The number of openings 
is subject to the length of the sling, but as a minimum the sling should be opened in at least 
three different locations. 

A rope, or unit ropes of one sling (if cable laid) in a series of used slings should be subject to 
destructive testing, if there are uncertainties with respect to capacity or internal conditions of 
the series. 

The nominal length of slings as specified in their original certificates should be verified or re-
determined by measuring under tension, prior to issuance of new certificate. For tension 
requirements, see Sections 14.2.9 and 14.2.10. 
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