Compliance is the starting point

There are good reasons why so many different valve types, sealing technologies, materials, and designs exist. Applications and service conditions vary, sometimes considerably, and selecting the right valve means understanding those differences.

Most valves are inspected and tested before leaving the manufacturer. If they pass, they are considered compliant with the customer's stated requirements.

But those tests cannot replicate everything a valve may encounter over years or decades in the field.

How will its materials interact with the fluid over time? How resistant will components be to erosion and wear? What happens after a certain number of operations? Will temperatures in service be significantly higher or lower than those experienced during testing, and how might that affect sealing or operation?

A valve can pass its manufacturing tests and still behave differently under actual service conditions.

Some of the most important things are difficult to specify

Design and material selection clearly play a key role in valve reliability. But they aren't the whole story.

Manufacturing processes and know-how can be just as significant. Designs can be replicated and material choices can be copied. But the accumulated knowledge behind how a valve is manufactured consistently and how apparently small design decisions interact is much harder to reproduce.

I sometimes hear operators express a preference for a particular sealing technology, for example. That's understandable, but focusing on one feature can overlook the contribution made by other aspects of the design, materials, manufacturing processes, and application.

This creates a challenge for both engineering and procurement.

Engineering can specify the required performance, while procurement can establish which products comply and compare their cost. But can a specification describe everything that makes one compliant valve more likely than another to remain reliable over its service life?

In my experience, it can't.

The cheapest compliant valve may not be the lowest-cost valve

This distinction becomes particularly important when CAPEX and OPEX are considered separately.

The initial purchase price of a valve is easy to see and compare. The potential costs created over its service life are much harder to predict.

Maintenance costs may accumulate gradually. More significant costs arise when maintenance requires a production stop or when an unexpected failure occurs. There may also be product losses from a leaking valve, as well as wider safety, environmental, and reputational consequences.

In many applications, these costs can be considerably higher than the cost of the valve itself.

Valve selection is only part of the story

Installation, field testing, cleaning, and commissioning can influence long-term reliability, even when the right equipment has been selected.

I remember being asked to attend the excavation and inspection of a leaking, buried 36-in Cameron T31 pipeline valve. The valve itself was a proven design, but inspection showed that its internals had been damaged during commissioning as a result of improper cleaning.

The valve needed to be excavated and replaced. This exercise cost approximately 15 times the price of a new valve, together with a four-day production stop.

This is where the manufacturer's service expertise can be particularly valuable. Even a proven valve design can be compromised if it isn't installed and commissioned correctly.

Think about the manufacturer as well as the valve

This is why I believe the valve manufacturer can be almost as important as the valve itself.

A manufacturer needs to understand the actual service conditions and what the operator is trying to achieve, rather than simply respond to a list of product requirements.

That requires dialogue.

Operators understand how their pipelines function. Valve manufacturers understand how valves are designed and manufactured. Bringing that knowledge together can identify considerations that may not be apparent from a specification alone, and help ensure the selected technology is genuinely suited to the application.

The same relationship matters once the equipment reaches the field too. Involving service expertise during installation, commissioning, and startup can help prevent avoidable problems. Feedback from operation and troubleshooting also gives engineering teams a better understanding of real service conditions, which can inform future product performance and development.

Specify the outcome, not just the product

Specifications, standards, and robust procurement processes remain fundamental to safe and consistent valve selection. But they work best when accompanied by an understanding of why particular requirements exist and what the valve ultimately needs to achieve.

That becomes even more important as applications evolve. The industry has accumulated decades of experience with conventional fluids, while hydrogen and CO₂ introduce service conditions for which there is considerably less field experience.

The question therefore shouldn't simply be: Does this valve comply with our specification?

It should also be: Is this the right valve, from the right manufacturer, to deliver the operational outcome we need over the life of the asset?