Tip #05 · Valves
Always confirm handwheel orientation with operations — not just the P&ID.
Before you finalize any valve placement, mentally operate the valve. Imagine yourself standing in front of it. Can you grip the handwheel? Can you see the position indicator? Can you read the valve tag?
A valve that is correct on the P&ID but impossible to operate safely from grade level is useless. Verify the operator’s access route during the model review, not at FAT. Once steelwork is fabricated and equipment is installed, relocating a valve becomes a multi-discipline change.
From the book
Can you attach a wrench to the packing gland? If the valve has a bolted bonnet, can you remove the bonnet bolts and lift out the internals for maintenance? If any answer is no, redesign the installation before it becomes someone else’s problem in the field.
The takeaway: P&ID compliance and operability are not the same thing. Walk through the model from the operator’s perspective before you finalize any valve placement.
