Environment Control & API Plans


API PLANS

Plan 01

Direct hole from Back Plate to Stuffing Box

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Plan 02 Jacketed Stuffing Box Click Here to View Picture
Plan 11

Recirculation from Pump case discharge through orifice to seal

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Plan 12 Plan 11 through strainer Click Here to View Picture
Plan 13

Stuffing box to suction through orifice

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Plan 21 Plan 11 with cooler Click Here to View Picture
Plan 23 Recirculation from seal with pumping ring through cooler & back to seal Click Here to View Picture
Plan 31 Plan 11 with cyclone Separator Click Here to View Picture
Plan 32 External Fluid injection Click Here to View Picture
Plan 41

Plan 31 + Plan 21

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Plan 51 Nonpresurised reservior provided in quench connection with dead end for blanketing Click Here to View Picture
Plan 52 Non Pressurised Thermosyphon Pot (For Tandem seal) Click Here to View Picture
Plan 53 Pressurised pot (thermosyphon) Click Here to View Picture
  - Back to Back double seal  
  - Tandem with reverse pressure balance seal in Inboard  
Plan 54 Circulation of clean fluid from external pumping system at higher pressure than the box pressure Click Here to View Picture
Plan 61 All holes plugged  
Plan 62

Quenching (used for washing ,temp. control & blanketing) Used for single internal & avoide the coke formation in services like hydrocarbon.

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DIFFERENT ARRANGEMENTS FOR ENVIRONMENTAL CONTROLS BASED ON PRODUCT CONDITIONS
 

 
Product conditions that cause seals to fail prematurely.
 

1.
Product that crystalize
 
 
  • Prevents seal sliding &causes wear of the  faces
 
  • Springs & sliding components can become logged &  inoperable.
 

         (Apply API 62, 02, 11 with steam traced)

2.
Product that Setup or Harden
 
   
 
  • Glue the faces together causing massive damage or make sliding components inoperable.
           (Apply API 62, 02, 11 with steam traced)
3.
Products that Flash
 
 
  • In passing from liquid to a gaseous state, faces can be blow open.
 
  • In the case of refrigerants, freezing of the atmosphere surrounding the seal can result ice & can restrict the seal movement.
           (Apply API 11)
4.
Gases
 
   
 
  • Provide little or no cooling/lubrication i.e. chances of dry running. This can damage the elastomer in many seal design.
           (Apply Double seal with API 53)
5.
Hot products
 
   
  • (>200 Deg.C) can damage elastomers and often cause coking that restricts seal movement.
6.
Dangerous Products
 
   
 
  • (Apply Double seal OR  Single seal with   API 62)
 
  • Single seal arrangement is economical for less dangerous products.
7.
Abrasive slurries
 
 
  • Restrict seal movement causing  the  lapped  faces  to open which allows the abrasives to penetrate between the faces.
 
  • (Apply Double seal with API 32 on inboard & API 53 for barrier OR stationary spring loaded seal with API 32)
8.
Extreme Corrosives
 
   
 
  • Damage seal components and shorten seal life.
 
  • (Apply Teflon bellow seal OR externally mounted reverse pressure balanced seal)

9.


Pressure Extremes

 
 
  • Limit is 25 Kg/cm2 for standard types displayed. For higher pressure special designing is reqd.
10.
High Speed
 
 
  • (Greater than 3000 RPM) Go for Stationary spring loaded seal.


SUITABLE ARRANGEMENT FOR THE ENVIRONMENTAL CONTROLS


 
  • Flushing with acceptable fluid
 

          (Water, Clean Product, Compatible Fluid, Downstream additive)

 
  • Quench Connection
 

          To provide heating or cooling, will carry away product leakage across seal faces. Water or            gas may be utilized to restrict air from product.

 
  • Cooling/Heating Jacketed Pump
 
  • Recirculation of cooling or heating fluid with heat  exchanger.
 
  • Double Seal (Tandem Seal Arrangement)
 
  • Double Seal (Face to Face Arrangement)
 
  • Slurry Seal
 
  • Outside (External Seal)
 
  • Convection circulation system for double seal              (Plan 53)

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