Hookup Drawings

A mechanical hookup drawing is used to show how an instrument is to be mounted on the plant. For example, there are a number of ways of attaching a pressure gauge to a pipeline; some of them are correct and some are incorrect depending upon what is in the pipe. The purpose of the drawing is to show the individual with the spanners what to do.

Electrical connections are usually shown on a termination diagram. They show the individual with the wire strippers and ferrule crimpers what to do.

The individual with the wire strippers has a different skill set compared to the individual with the spanners, though after some experience there is usually considerable overlap between these individuals' capabilities.

Thanks. But i need to view each one example of all hookup. Could you tell me link or website.

Hi there,

As stated by PW - some drawings are incorrect while some might be a 50/50 issue.

You can have a look at www.isa.org - although you will have to be a member to join.

You can also have a look at www.ssg.se Again you might be able to get a free look, but I rather think that you will have to be a member.

Regards,

Craig

Process Hookup drawing relates to all process measuring devices and details;

1. the location of the instrument in relation to the process connections/tapping points (whether above, below etc), which are completed by piping department in most cases.

2. all materials and fittings used to connect the instrument to the process connection, the quantities of all components (fittings, tubing, manifolds etc) are provided.

3. the location of each component in the installation.

4. any particulars relating to the leads such as optimum length and sloping etc.

In general these hookups provides the details of the installation to ensure proper operation.

Pneumatic Hookup drawing relates to connection of devices which require air or nitrogen for motive force, purging etc.

1. all materials and fittings used to connect the instrument to the to the source of air or nitrogen. this may be branch instrument air piping routed close to the device or a manifold located some distance away which is used to supply multiple devices. The quantities of all components are provided.

2. the location of each component in the installation.

3. any particulars relating to the leads such as optimum length and sloping etc.

These documents detail to the instrument fitter how the installation is supposed to be done.

The mounting or installation diagram shows;

1. how the instrument is to be installed in relation to supports/stanchions and other equipment.

2. The orientation of the instrument i.e. whether right-side up, side mounted, upside down etc.

3. These drawings may detail what materials are required to fabricate the instrument supports or what type of supports and fixtures are required.

Electrical Hookup diagrams are essentially to detail power and signal connections, they may also include any interconnections with other devices and any available connections for communication purposes.

The hookups are important not only for installation but also for developing material take-offs (MTOs) for procurement and can also used for materials management during construction (tracking items issued to installation contractor/department, issuing/requisition records etc).

I hope that this helps.

You can contact me at dhaecl@gmail.com, I may be able to assist with some examples.

CAN U SEND ME SOME OF THE iNSTRUEMNT HOOK UP DRAWING WHICH COMPRISES OF TRANSMITTER,VALVES,SWITCHES,etc..THIS WILL BE HELPFUL FOR MY INTERVIEW..CAN U MAIL THIS TO aeiou_era@yahoo.co.in

Hi,

Can I get some assistance from you with relevant examples of instrument hookup drawings? I am relocating back to Instrumentation Engineering after 10 years of absence from power plant maintenance in I&C and as such have lost all the documents and need to refresh my rust.

You may mail me on krchome@hotmail.com

Regards

Kaushik RC