How Clearguard^® Works

Clearguard^® is a revolution in process variable measurement.

Clearguard^® solves the problem of blocked or partially blocked Instrument Tapping Points by keeping them clear of scale and debris build-up. By periodically stroking a special scraping tool through an Instrument Tapping Point, Clearguard^® removes any new scale or debris deposits.

Each Clearguard^® model consists of an Scraper attached to a Shaft and actuated by a Double Acting Pneumatic Cylinder. A Body Assembly contains the Primary Sealing arrangement and is attached to an Interface Unit, which includes Impulse Line and Vent connections.

By switching instrument air between the pneumatic cylinder ports (2,3) the scraping tool (1) is cycled through the Instrument Tapping Point, removing any deposits of scale or debris.

The scraping tool (1) is designed to allow the unrestricted flow of purge medium throughout the stroking process, ensuring no false readings are generated at the pressure / differential pressure sensor.

The seal assembly (5) prevents the egress of process materials. On LTPR models the outboard shaft (4) is a visual position indicator. On the end of the outboard shaft is a pin (6) which, in the case of the Clearguard^® not fully retracting due to loss of air or power, can be engaged by a manual retracting tool. LTPW and HTP models use an internal connection for the manual retractor. Actuation of the Clearguard^® can be initiated manually or via a pneumatic or electronic timer.

• All Pressure Retaining Components include traceable material certification
  to DIN 50049 3.1b
   
• All Pressure Retaining Components comply with AS1210 unfired Boiler and
  Pressure Vessel Code principles of design.
   
• All Pressure Retaining Components Hydrostatically Pressure tested to 1.5
  times Material Pressure Rating per ANSI B16.5.
   
• Every unit is function tested to specification.
   
• Standard material of construction for the body is 316 Stainless Steel. Alternative materials are available.
   
• Standard Rod and Scraper materials for LTP are 316 Stainless Steel and for
  HTP is SAF 2205 Duplex Stainless Steel. Alternative materials are available.
   
• Type LTP is suited for temperatures up to 180° C (356°F) and ANSI 300# per
  ANSI B16.5
   
• Type HTP is suited for temperatures up to 280°C (536°F) and ANSI 900# per
  ANSI B16.5. Consult factory for higher temperature and pressure applications.
   
• All components are guaranteed against defect in materials and
  workmanship for 12 months.

Benefits

You can read about the benefits provided by Clearguard^® for your operations, or continue on to view the Clearguard^® parts maps.

Parts Maps

• LTPR with CG Valve - Process Temperatures up to 180 degrees Celsius (356°F). Process Pressures up to ANSI 300 # Rating (per ANSI B16.5). 316 Stainless Steel Body, Rod and Scraper. 316 Stainless Steel Integral Pneumatic Cylinder. Isolation Valve. (1000 WOG Rated) One Piece Rod and Retractor. Clear Polycarbonate Retractor cover. Insertion lengths up to 450mm (18 inches) - Open Map (pdf)
   
• LTPW with CG Valve and Adaptor Flange - Process Temperatures up to 180 degrees Celsius (356°F). Process Pressures up to ANSI 300 # Rating (per ANSI B16.5). 316 Stainless Steel Body, Rod and Scraper. 316 Stainless Steel Tie Rod Pneumatic Cylinder. Isolation Valve. (1000 WOG Rated). Insertion lengths up to 700mm (28 inches). Compact design. Adaptor Flange accessory available - Open Map (pdf)
   
• HTP - Process Temperatures up to 280 degrees Celsius (536°F). Process Pressures up to ANSI 900 # Rating (per ANSI B16.5). Optional SAF 2205 Duplex Stainless Steel Rod and Scraper. 316 Stainless Steel Pneumatic Cylinder. Energized Packing Assembly. Insertion lengths up to 900mm (36 inches). Compact design. - Open Map (pdf)