Pulp Mill Mechanical Seals, Power Transmission Couplings and More | John Crane
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Pulp and Paper Processing

In the pulp and paper processing industry, efficiency and reliability are key to controlling expenses because they help reduce the amount of energy required by critical processes. John Crane maximizes both — and helps companies meet strict pollution regulations — with engineered components and seal support systems that limit emissions, tolerate high temperatures and reduce water consumption. Plus, our 200+ rapid-response facilities can also minimize unplanned downtime by providing service, repair and support worldwide.

We deliver proven mechanical seal technologies and services that improve manufacturing performance through:

  • increased operational reliability
  • improved equipment uptime
  • fewer maintenance interventions
  • reduced seal water usage

Cost-saving Technology

The John Crane product line specific to pulp and paper includes the SmartFlow intelligent seal support system, a revolutionary control system that reduces the amount of water used to lubricate seal faces. By limiting water consumption, pulp and paper processing companies not only save on their water bills, they can also cut any costs associated with filtration and treatment processes — resulting in significant cost savings overall. We also offer modular seals — such as our 5600 Series — that are standardized for use across the entire paper mill, and split seals (37FS) that allow for easy replacement without having to dismantle large equipment such as pulpers, agitators and fan pumps.

Other innovative John Crane products tailored to pulp and paper processing applications include:

O-ring Pusher Seals

5600 Series: The first truly universal cartridge seal with built-in modularity 

Safeseal Type JCS1 and Type SE1: Rugged, pump-integrated single seal for clean and lubricating fluids

Safeseal Type JCS2 and Type SE2: Double-balanced design used in pumps for fiber line, evaporation and recovery boiler areas

John Crane Single SB1 and Double SB2 Seals: Suitable for ANSI and DIN pump designs subject to a wide range of demanding conditions

Split Seals

Type 3740 and Type 37FS Series Fully Split Seals: Allow rapid installation and maintenance without disassembling the equipment involved


Style K1730, Style K1730 and K1771: Constructed of high-tensile strength, abrasion-resistant fibers for excellent chemical resistance, dimensional stability, resilience and conformability

Style 1345 and 1349: Constructed of high-tensile strength abrasion fibers. They are ideal for a wide-range of abrasive and slurry services.

Style C1050: Chemical service: PTFE based packings, dry or lubricated. pH 0 to 14.

Styles C1056 and C1057: Designed with FDA-compliant PTFE fibers and lubricant to prevent contamination

Style RPS44: Resilient packing designed to handle high axial and radial shaft movement

Seal Support Systems

Safeunit, Safeunit Ultima and SmartFlow: Reliable and easy seal monitoring

Safesiphon: Delivers effective lubrication and cooling for double mechanical seals

SafeJet: Reliable and compact self-cleaning micro filter

Power Transmission Couplings

A Series: Urethane element couplings known for quick installation without moving prime mover or driven equipment

L Series: Designed for demanding industrial applications with a scalloped hub for the shaft

T Series: Cartridge design allows for easy fit on-site and maximum reliability

Pulp and Paper Processing Services

John Crane services can help extend the life of pulp and paper processing applications and increase production by limiting unplanned downtime and identifying opportunities for improvement:

Equipment Service

John Crane Equipment Service assists with critical systems checks and plant equipment maintenance as well as repair, removal and reinstallation services.

Reliability Support

John Crane Reliability Support services assess equipment reliability and performance, analyze root cause failures and recommend strategies for improvement.

Asset Management

John Crane Asset Management software offers customers a holistic view of their current systems to help spot unleveraged opportunities.


John Crane provides a wide range of training courses that cover the correct procedures for installing, operating and maintaining equipment components.