Secondary Containment

Machinery maintenance 1Engineered seal fundamentals

Secondary Containment devices

Acc. to API610 • Solid(fixed) bush• Floating bush• Segmental Floating bush

Non contacting Bushing ‘T' feature (API 610 coding)

• Lip seals• Packing

Contacting

Secondary Containment

Machinery maintenance 2Engineered seal fundamentals

Secondary Containment devices

Acc. to API682 2nd

Seal design with one flexible element, seal ring and mating ring mounted in containment seal chamber

Contacting containment

seals

Wet contacting sealAid utilizing unpressurized buffer

liquid.

Dry running sealAid utilizing gas buffer.

Non-contacting containment

seals

containment seal pressure seal chamber pressure

Secondary Containment

Machinery maintenance 3Engineered seal fundamentals

Secondary Containment devices

Acc. to API682 2nd

containment seal pressure seal chamber pressure

* Outer seal for all Arrangement 2 configurations is a containment seal.* Buffer gas (purge) is optional.* Uses Plan 7x series flush plans.* Isolation bushing between containment seal and CSD&V-port With radial clearance 1.5mm.

Secondary Containment

Machinery maintenance 4Engineered seal fundamentals

Fixed bush Made of a non-sparking material.Max eccentricity W/ shaft 0.1mm.

Diametrical clearance between bush and shaft or sleeve should be

0.025”+(0.005*each additional number of

inches of shaft diameter more than 2”)] specified by

API 610,API 682 6.1.2.22.

Service speed and life increased over lip seal

Secondary Containment

Machinery maintenance 5Engineered seal fundamentals

Floating bushDiametrical clearance between bush and shaft or sleeve should be

Up to 2” (50 mm) 0.007 (0.18 mm) inch clearance2 to 3” (50 mm to 80 mm) 0.009 (0.225 mm)3 (80 mm) to 4.75” (120 mm) 0.011 (0.28 mm)

specified by API 610,api 682 6.1.2.23.

Spring enable bush to float radially and keep concentric to shaft.Shaft journal must be hardened.

Service speed and life unlimited increased over lip seal

Secondary Containment

Machinery maintenance 6Engineered seal fundamentals

Floating segmental bushSame like floating bushSplit to enable easier fitting.Garter spring compensate shaft ovality reducing leakage rate in case.

PackingShaft journal must be hardened.Need frequent replacement as leakage increase

Secondary Containment

Machinery maintenance 7Engineered seal fundamentals

Lip sealOil seal, Safe-T-seal, metal cased lip sealShaft journal must be hardened.Low dutyActivate on shaft with garter spring or/and as pressure rise.