If you are still unsure please give us a call and we can talk you through this to access your needs and requirements.
Below are a few of the frequently asked questions we get regarding crane hire and a contract lift.
|Question||Crane Hire||Contract Lift|
|Does the crane have an operator supplied?||Yes||Yes|
|Who is responsible for selecting the right type of crane?||Customer||Crane Firm|
|Who plans the actual lift?||Customer’s AP*||Crane Firm’s AP*|
|Who plans the slinging and signalling duties?||Customer||Crane Firm|
|Who supervisors the actual lift?||Customer||Crane Firm|
|If damage occurs to the crane who is responsible?||Customer||Crane Firm|
|In the event of injury or damage who takes on the legal liability?||Customer||Crane Firm|
|Who has to insure the plant and goods under the hook?||Customer||Crane Firm|
|* AP (Appointed Person) is the person who is qualified to plan lifting operations.|
When it comes to crane hire there are many factors to consider, our guide below focuses on mobile crane sizes.
Please note that not all lifting operations are identical, therefore only qualified Appointed Persons should be responsible in choosing the right crane size and type for your project.
The chart below is simply a guide, if you have any doubts please get in touch. For your information, we offer a free no obligation quotation where we can come out and access your needs and requirements.
There are many different variables to consider. The most important of these are the weight, radius and height. In the circumstances were there are no obstructions for the lift, for example buildings, or in the event the item did not need to be lifted high, then the height would be less important than the radius and weight when determining the size of the crane.
|Weight||What is the actual weight of the item you will be lifting? As well as the of the item the weight of the tackle and crane hook need to be considered, these can vary depending on the actual type of crane and its lift.|
|Radius||The radius is the distance from the centre of the cranes slew ring to the centre of gravity on the load’s furthest position from the crane.|
|Height||How high will the crane be lifting? In the event the crane is positioned close to a building, it will need to go higher out to achieve the radius required.|
To find out the weight check its specification sheet. In the event the item does not have one then contact the manufacturer to confirm this. In the event that on the day the weight is different to that used in the plan you will end up either having to higher a larger crane or the lift may not be possible.
The radius is measured in metres, to do this measure horizontally, the distance from the centre of the cranes slew ring in the position it will be set up to the centre of gravity of the loads furthest point away from this.When it comes to the hight this can be determined by either the dimensions of the object or obstructions e.g. buildings around it, this should be also measured in metres.
When determining crane size there are many things to consider, this is why you should have an Appointed Person to properly plan the lift. Below are a few examples of other issues which can also affect your size.
|Equipment||The weight of the products under the hook can vary depending on the items which are being lifted and how it needs to be slung. In some occasions spreader beams could be required, in these circumstances this can significantly increase the weight that is under the hook and consequently the size of the crane needed.|
|Hook Block Configuration||This needs to be determined for the lift again this can be affected by a number of issues for example the item being lifted and its weight. Each hook block can have different weights, therefore this needs accounting for when looking at overall lifting capacity.|
|Obstructions/buildings etc||Obstructions for example buildings, overhead cables etc can all influence the whereabouts of where a crane is able to setup. Consequently, this also can increase the crane’s radius and crane size required.|
|Small spaces||Where there is only a small space for a mobile crane, it maybe only able to half rig. When half rigged, its lifting capacity will decrease, therefore could require larger crane than orginally expected to complete the lifting operations.|
|Other Factors||There are many different factors in addition to these above which can come into consideration when looking at crane sizes. For your peace of mind we offer a full contract lifting service, which can take all this stress and risk away. Find out more|