Low E Valve Sealing Question and Answer Web ForumCameron Rapoport & Rodney Roth

2

Today’s Question and Answer session is sponsored by the Fugitive Emissions Summit Americas.

3

Can “low leaking valve technology” be achieved in control valves?

Yes! (below 450F) PTFE or PTFE and graphite

Sort of! (above 450F) Blocking agents can volatize

Use Live Loading

4

How are low emission valves designed differently than standard valves? Packing and Valve Manufacturers

must adapt and work together Roughness and hardness of surfaces

Stem is the most critical Tighter tolerances and clearances Higher compression stress on packing

5

How will API 622 & 624 develop?

API 624 will be added as a requirement to more valve standards 603 623

622 will continue to evolve Change to pass/fail Allowable leakage reduced to 100ppm No more packing adjustments

6

What is the definition of the “L” in LDAR?

Leak Leak definitions vary by regulation, component,

service, and monitoring interval NSPS – 10,000ppm NESHAP – 500 or 1,000ppm Consent decrees – as low as 100ppm

Best practice – use one lower than required

7

What is the definition of the “R” in LDAR?

Repair First attempt at repair

Re-tightening Re-torqueing If necessary…replacing

Emphasis should instead be placed on preventing leaks before they must be managed

8

What are the biggest concerns for LDAR programs?

Effective training Initial training Continuous improvement

Proper Installation Inspection Measurement installation

9

How important is thread lubricant/anti-seize?

Very Large variations in

finish/friction of components Accuracy, repeatability

Selection in key Low Knut factor scattering Low wet vs. dry Knut factor variation Low washout Corrosion protection

40%

50%

10%

Distribution of Torque to Fastener Load Conversion

Thread frictionFriction between nut and flange faceLoad transmitted to bolt stretch

10

Thank you

Please respond to our follow-up survey

Big thank you to Rodney Roth and the Fugitive Emissions Summit Americas 2016

Thank you for attending!