S1E55 Clause 13

All right, we are now done with the design.

And actually we're done with building at least the SIS logic solver.

Now, what do I mean by that? Well, in the standard we're in clause 13.

So we've done all of our design, we've done all of our programming, Now we need to go build it, and that's technically part of clauses 1112, the actual selection of equipment, configuration of equipment, packaging that equipment up, and putting it into a package that's gonna get delivered to the site.

And specifically, we're really interested here in the SIS logic solver.

Now this clause 13, I have a little bit of heartburn about.

So the title of clause 13 is factory acceptance test.

And it is a very common thing for some subsystems of the SIS, but not others.

So for instance, your SIS might include a pressure transmitter.

you're not going to do a factory acceptance test for the pressure transmitter.

You're just going to buy one off the shelf at your local distributor or have the vendor send it to you.

You're not going to fly to the facility, test it to make sure that it works.

So factory acceptance test is basically going to be the domain of the SIS logic solver because there's a lot of Customization, shall we say.

It is an engineered product and you want the engineering that they do specifically for you, you need to make sure that that was done properly and you want to do that before you actually physically receive the piece of equipment.

You don't want to pay for it if it's not what you wanted, which is why the factory acceptance clause is usually put in place.

So the typical workflow is you're going to write your safety requirements specifications.

You're going to do this in sufficient detail so that the equipment vendor can actually do their work.

And now on the FAT, I'm going to say this right now, and you just need to remember it for the duration.

I'm talking about the SIS logic solver and it will usually be a PES, programmable electronic system logic solver.

A PLC, programmable logic controller is typically what we're talking about here.

So that's the scope.

I'm not talking about the field equipment.

I'm not talking about what's going on at site because obviously it's not going on at site.

It's going on in the factory.

So typically we're going to hand over our SRS to the equipment vendor or sometimes to a systems integrator and all of what's going on in the factory acceptance testing isn't actually occurring in the factory where the logic solver was built.