SPECIAL TOPIC : SEALING & PACKING TECHNOLOGIES
all cases , the packing set sealing behaviour with three different seating torque values is accurately represented by an equation that reaches an optimum sealing value with a particular seating torque value , providing the lowest emissions . With higher torque values , sealability starts to decrease . In all cases , sealability initially improves with an increase in seating torque value until the optimum value is reached . This is clearly represented in the carbon fibre packing which , due to its composition , has a lower ability to seal , and changes in this ability are clearer .
If the optimum seating torque value is exceeded , the packing set loses some of its sealability . This must be due to overcompression , which lowers the packing set ’ s ability to adapt to the irregularities in the stuffing box due to increased stiffness . These tests show that , once we know the optimum torque value for the packing set at the working conditions , an initial deformation or an optimal seating torque value before operation could : a ) improve the packing set behaviour during operation and , b ) minimise some irregularities both in the packing and in the stuffing box , generating more homogeneity and better performance of the packing set .
The author would like to thank Babcock Valves for performing the tests and providing photographs .
Torquing of gland nuts .
Figure 1 : PTFE packing test .
INVESTMENT CASTING FEINGUSS
MICROFUSIONE
Figure 2 : Graphite packing test .
Figure 3 : Carbon packing test .
ABOUT THE AUTHOR
Maria Garcia is the R & D Manager of MONTERO FYE S . A . and a member of the ESA Packings Division . She has a degree in Physical Chemistry ( Basque Country University ) and a postgraduate qualification as an ‘ Expert in Plastics and Rubber ’.
APPROVALS
API-20A ISO 9001:2015 by TUVNORD ISO 14001:2015 by TUVNORD ISO 45001:2018 by TUVNORD PED 2014 / 68 / EU by TUVNORD AD 2000-Merkblatt W0 by TUVNORD LLoyds Marine Approval NORSOK M-650 Approval NORSOK CK-3MCUN DNV / GL Marine Approval IBR CERTIFICATE
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