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EQUIPMENT INSTALLATION.

Crane enhancer   Platform bridges   Change-out of cranes   Template transfer   Previous page

There are several ways of lifting with the PEF principle, depending on the cargo weight and size. The easiest way of using the PEF system is actually to enhance the existing crane capacity. If however, the cargo weight exceeds the static lifting capacity of the platform cranes, the ordinary PEF system should be applied.

Enhancing the crane capacity 

Transfer and lifting of heavy process equipment, coil tubing, containers, ball valves and spool pieces will normally be handled by the platform crane. In some instances, however, the weight of these objects exceeds the platform crane maximum lifting capacity or, because of the Dynamic Amplification Factor (DAF),  makes it necessary to wait on weather in order to perform safe lifts.

TRC has developed a special tool, that will enhance the effective platform crane lifting capacity by reducing the DAF and protecting the crane against excessive loads. The tool, called HICO, is attached to the crane hook and to the cargo.

The HICO / SEACO combination tool has the following main functions:

1. Pre- stress the crane to 80% of cargo load. (I.e. taking up all slack and most of the elasticity.)

2. Transfer the cargo from the vessel to the crane on top of a heave motion in order to reduce the DAF.

3. Protect the crane if the total load of the cargo and the DAF exceeds the nominal capacity of the crane.

4. Avoid contact between cargo and vessel after load transfer, even if the crane is not lifting during the  transfer event. 

The HICO / SEACO combination makes it safe and easy to transfer objects close to the maximum platform crane capacity. 

The HICO machine / SEACO system combination will save waiting on weather, reduce damage to the cargo and  wear on your offshore crane.

Lifting 72 " ball valves and spool pieces weighing close to the static lifting capacity of the crane may now be within reach.

The special SEACO rig for the ball valve load transfer.

The function of the HICO machine is demonstrated in animations you can download.

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Platform bridge installations.

The PEF lifting system is well suited for installing bridges between the platforms. This bridge installation is made by using 4 small lifting machines, two on each platform. Note that the lifting machines may alternatively be installed on the bridge.

Here, you can see the bridge landing with the lifting jacks.

Advantages:

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Change-out of cranes.

The reason for performing a change-out is normally that the life time of the old crane has come to an end, or that the crane does not longer serve its intended purpose. For the reasons just mentioned, it might not be so easy to use the old crane to install a new one.

TRC has therefore proposed two relatively simple methods:

  Using the HICO / SEACO combination and the old crane.

This might be what you need in order to still make use of the old crane to lift on board the new one. What you do is to connect the HICO machine to the crane hook, and lift up the new crane. Off course, in this case, you need an area to put down the new crane temporarily while you cut the crane column, skid the old one over and install the new one. The new crane, then has to lift down the old one.

If you feel that this seems like a lot of work, we agree, and therefore we have developed a much better way, using an A-frame / HICO solution.

 Using a specially designed A-frame with HICO on the existing crane column.

There are two ways of using this system:

1. If the crane column must be renewed: The A-frame system in combination with the HICO / SEACO gear will be supported by the weather deck and  either be tied-back or balanced with counter weights, making it easy to remove the old crane and column, and install the new one. 
2. If the crane column shall not be renewed: The A-frame system in combination with the HICO / SEACO gear will clamp to the existing crane column, making it easy to remove the old crane, and install the new one. 

If the crane column is not strong enough or has to be renewed, this is the very best way of removing the old crane and column and re-fitting a new one.

Advantages:

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Transfer of objects from a vessel to a drilling rig.

Templates, satellites and small manifolds may be installed on the sea bed by the drilling rig. However, since the moon-pool area might be to small to accommodate some of these units, it is now easy to perform a transfer from a vessel, skid the unit in under the rig, and then do the installation.

The drilling rig must be fitted with a skid frame with a tie-back to the rig deck in order to pick up the template from the aft end of the vessel.

You will be able to download an animation showing how this is done.

Advantages:

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TR Consulting, Joh. Falkb.gt. 10, 5538 Haugesund, Norway. Tel: +47 52729124, Fax: +47 52724196, C.E.O. Cell phone.  +47 90 616969  e-mail: trcons@online.no or trcons@start.no