application engineering api 682 - sealmaticindia.com · step iv: completes the sealing system...

®

Mechanical Seals & Supply Systems for:Refinery & Petrochemical Applications

Selection and application recommendations according to API 682.

APPLICATION ENGINEERING

API 682

AE 3

/ 0

5-20

14

Step I Category

Category 1 Category 2 Category 3

ISO 3069 type C, ASME B73.1 , ASME B73.2 ISO 13709 / API 610 10th edition

-40 °C … 260 °C, 21 bar g (-40 °F … 500 °F, 300 PSI) -40 °C … 400 °C, 41 bar g (-40 °F … 750 °F, 600 PSI)

Minimal data requirements Rigorous data requirements

Step II Arrangement and configuration

Arrangement 1 1CW-FX

Single seal cartridge Contacting Wet - FiXed throttle bushingCategory 1: carbon throttle bushingCategory 2: non-sparking metal throttle bushingCategory 3: not applicable

1CW-FL

Contacting Wet - FLoating throttle bushingCategory 3: carbon throttle bushingCategory 1 and 2: carbon throttle bushing

Arrangement 2 2CW-CW

Dual seal cartridge- pressure between seals

less than seal chamber pressure

- internal reverse balance feature

- fixed carbon throttlebushing

Contacting Wet - Contacting Wet

2CW-CS

Contacting Wet - Containment Seal (non-contacting or contacting CS)

2NC-CS

Non-Contacting - Containment Seal (non-contacting or contacting CS)

Arrangement 3 3CW-FB

Dual seal cartridge- pressure between seals

higher than seal chamber pressure

- internal reverse balance feature

- fixed carbon throttlebushing

Contacting Wet - Face-to-Back

3CW-BB

Contacting Wet - Back-to-Back

3CW-FF

Contacting Wet - Face-to-Face

3NC-BB

Non- Contacting - Back-to-Back

3NC-FF

Non-Contacting - Face-to-Face

3NC-FB

Non-Contacting - Face-to-Back

Step III Type and spring position Flexible element

Type A Rotary springs

Pusher sealTemperature: -40 to 176 °C (-40 to 350 °F)Pressure: 41 bar g (600 PSI)Multiple springs: Alloy C-276Single spring: SS 316O-rings: FKM or FFKM

NBR, HNBR, EPM, EPDM, TFE …

Seal face surface speed < 23 m/s

Stationary springs

Seal face surface speed > 23 m/s

Type B Rotary bellows

Metal bellows seal with O-ringsTemperature: -40 to 176 °C (-40 to 350 °F)Pressure: 21 bar g (300 PSI)Metal bellows: Alloy C-276O-rings: FKM or FFKM

NBR, HNBR, EPM, EPDM, TFE …

Stationary bellows

Type C Rotary bellows

Metal bellows seal with flexible graphiteTemperature: -40 to 400 °C (-40 to 750 °F)Pressure: 21 bar g (300 PSI)Metal bellows: Alloy 718Sealing element: flexible graphite

Stationary bellows

Totally Engineered Sealing system (ES)

For service conditions outside the operating limits of type A, B and CTemperature: < -40 or > 260 °C (< -40 or > 500 °F) category 1

< -40 or > 400 °C (< -40 or > 750 °F) category 2 and 3Pressure: > 21 bar g (300 PSI) category 1

> 41 bar g (600 PSI) category 2 and 3Surface speed: > 23 m/s (75 ft/s)Shaft diameter: below 20 mm (0.75 inch) or above 110 mm (4.3 inch)Medium: highly corrosive fluids for which the specified materials in

API 682/ISO 21049 are not suitable, fluids with absolute vapour pressures > 34 bar a (493 PSI) , unstable liquid properties (e.g. multiphase, non-Newtonian), high viscosity or pour point above or within 20 °C (68 °F) of the mini -mum ambient temperature.

Default Optional

Optional

configurationsconfigurationsdesign feature

Categories, Arrangements and Seal Types

Classification of Sealing SystemsAPI 682 and ISO 21049 specify a range of different sealing systems. Parameters such as category, arrangement, configuration, type and API plans are to be considered.

The chart is a quick overview about the basic features of the different categories, arrangements and seal types. It also shows the links between these parameters and marks default and optional selections.

Step I: The category determines the applicable seal chamber, basic seal design features, maximum operating conditions, testing and data requirements. Each category has special demands regarding the seal arrangement, configuration and type. There are three different categories.

Step II: Determines the arrangement of the mechanical seal cartridges and their possible configurations.

The configuration determines the sealing method, orientation of the mechanical seal components, the use of containment seals and the required API plans. API 682 and ISO 21049 specify six default configurations and five optional configurations. Each of these configurations can be realized with different seal types.

Step Ill: Definition of the seal type, the design and material of the spring element and the secondary seals.It defines the appropriate operating limits. API 682 and ISO 21049 specify three basic seal types, a fourth option is a totally engineered sealing system (ES).

Step IV: Completes the sealing system classification by selecting the required API plan.

API 682 and ISO 21049 introduce a seal code which contains information about the category, arrangement, type and API plan.

1

QDF

1CW-FX Contacting Wet - FiXed throttle bushingExample: UFL850N (type B)

Plan 13Recirculation from seal chamber to suction

TI

FI

PI

Option SM ClientPlan 32External flush into the seal chamber

Plan 11Recirculation from discharge to seal chamber

plugged

Plan 61Plugged connections

F D Q

1CW-FL Contacting Wet - FLoating throttle bushing

drain

QuenchPlan 62External quench

LSH

drain

Plan 65Leakage control by float type level switch

Process side Atmospheric side

TI

Plan 23Internal recirculation through a cooler

Plan 31Recirculation from discharge through a cyclone separator to seal chamber

Default Optional

configurationsconfigurations

Each configuration is available for seal types A, B and C

Arrangement 1Single Seal Configurations and API Plans

2

LBO LBI

2CW-CW Contacting Wet – Contacting Wet

PI PSH

LSH

LSL

if specified

filling

flare

LI

Plan 52Unpressurized buffer fluid system

2CW-CS Contacting Wet – Containment Seal

2NC-CS Non-Contacting – Containment Seal

PI

M

PSLFSHFIL

if specified

SM Client

FE

PCV

Plan 72Buffer gas system

PI

LSH

PSH

flare

LI

drainif specified

Plan 75Condensate recovery for condensing leakage

PIPSH

flare

drain

Plan 76Vapour recovery system for non-condensing leakage

Process side Between seals


TI

FI

PI

Option SM ClientPlan 32External flush into the seal chamber


Plan 14Recirculation from seal chamber to suction and circulation from discharge to seal chamber

Default Optional


Each configuration is available for seal types A, B and C

F

F CSV CSD GBI

CSV CSD GBI

Arrangement 2 Dual Seal Configurations and API Plans

Pressure between seals less than seal chamber pressure

3

3CW-FB Contacting Wet – Face-to-Back

3CW-BB Contacting Wet – Back-to-Back

3CW-FF Contacting Wet – Face-to-Face

WS\NNLK

Plan 02Dead end (plugged connections)

PI PSL

LSH

LSL

if specif ied

filling

N2

LI

Plan 53ABarrier fluid reservoir

Plan 54External barrier fluid system


PI

TI

PSL

if specif ied

filling

vent

Plan 53BBarrier fluid bladder accumulator system

PI

TI

PSL

LSL

filling

vent

PRV

LI

Plan 53CBarrier fluid piston accumulator system


Plan 14Recirculation from seal chamber to suction and circulation from discharge to seal chamber


Default Optional

con�gurationscon�gurations

if specif ied

external source

Arrangement 3 Dual Seal Configurations and API Plans

Barrier fluid pressure higher than seal chamber pressure

4

3NC-FB Non-Contacting – Face-to-Back

PI

MPSL

FSHFIL

if specified

SM Client

FE

PCV

Plan 74Pressurized barrier gas


3NC-BB Non-Contacting – Back-to-Back

3NC-FF Non-Contacting – Face-to-Face

plugged

Plan 02Dead end (plugged connections)

Default Optional


Arrangement 3Dual Seal Configurations and API Plans

Barrier gas pressure higher than seal chamber pressure

5

Sealing systems selection by seal features

Arrangement Default configuration Type Flexible element

1Single seal cartridge

1CW-FX

Contacting Wet sealwith a FiXed throttle bushingapplicable API plans (process side):01 , 02, 11 , 12, 13, 14, 21 , 23, 31 , 32, 41applicable API plans (atmospheric side):51 / 61 , 62, 65

ARotary springsStationary springs

BRotary bellowsStationary bellows

CRotary bellowsStationary bellows

1CW-FL

Contacting Wet sealwith a FLoating throttle bushingapplicable API plans (process side):01 , 02, 11 , 12, 13, 14, 21 , 23, 31 , 32, 41applicable API plans (atmospheric side):51 / 61 , 62, 65




2

Dual seal cartridge

Operated with unpressurized buffer medium

2CW-CW(tandem)

Contacting Wet sealsapplicable API plans (process side):01 , 02, 11 , 12, 13, 14, 21 , 23, 31 , 32, 41applicable API plans (between seals):51 , 52




2CW-CS(tandem)

Contacting Wet inner sealwith a Containment Sealapplicable API plans (process side):01 , 02, 11 , 12, 13, 14, 21 , 23, 31 , 32, 41applicable API plans (between seals):71 , 72, 75, 76




3

Dual seal cartridge

Operated with pressurized barrier medium

3CW-FB(tandem)

Contacting Wet sealsin Face-to-Back arrangementapplicable API plans (process side):01 , 02, 11 , 12, 13, 14, 32applicable API plans (between seals):53A, 53B, 53C, 54




3NC-BB

Non-Contacting sealsin Back-to-Back arrangementapplicable API plans (process side):01 , 02, 11 , 12, 13, 14, 32applicable API plans (between seals): 74




Arrangement Most common optional configurations Type Flexible element

2 See above 2NC-CS (tandem) Non-Contacting inner seal with a Containment Seal A Rotary springs

3 See above3CW-BB Contacting Wet seals in Back-to-Back arrangement A Rotary springs3NC-FB (tandem) Non-Contacting seals in Face-to-Back arrangement A Stationary springs

Operation mode API plan Description

Primary flush

21/22 Circulation from pump discharge through cooler to seal23 Circulation of liquid from seal chamber through cooler to seal31 (41 ) Circulation from discharge through cyclone separator to seal32 Injection of clean liquid into seal chamber

Quench/buffer systems

51 External reservoir provides static liquid quench52 External reservoir provides circulation buffer liquid62 External source provides flowing quench liquid72 Gas buffer system

Barrier systems

53A Barrier liquid system with reservoir53B Barrier liquid system with bladder accumulator53C Barrier liquid system with fluid piston accumulator54 Barrier liquid system from external source74 Barrier gas system

Leakage collection/alarm

65 Recovery system with level control for liquid leakage75 Recovery system for condensing leakage76 Recovery system for non-condensing leakage

Default Optional


6

Standard seal type Temperature °C (°F)

Pressure bar g (PSI)

Mechanical seal Supply system

Type Arr.1) API plan2)

Non

-hyd

roca

rbon

sWater

< 80 (180)< 21 (300)

A

1 1121 … 41 (300 … 600)

> 80 (180) < 41 (600) 1 23

Sour water

< 80 (180)

< 21 (300)2 52

21 … 41 (300 … 600)

Caustic, amines, crystallize< 21 (300)

1 6221 … 41 (300 … 600)

H 2SO4 (max. 20% at 25°C)< 21 (300) 3 53A

H 3P04 (max. 20% at 80°C)

All other acids – ES 3 note 3)

Non

-flas

hing

hyd

roca

rbon

s

Absolute vapour pressureless than 1 barat pumping temperature

-40 … -5(-40 … 20)

< 21 (300)

A

3

53A53B or C21 … 41 (300 … 600)

-5 … 176(20 … 350)

< 21 (300) 53A53B or C21 … 41 (300 … 600)

176 … 260(350 … 500)

< 21 (300) C 02+53A21 … 41 (300 … 600) ES 02+53C

260 … 400(500 … 750)

< 21 (300) C 02+53A21 … 41 (300 … 600) ES 02+53C

Flas

hing

hyd

roca

rbon

s

Absolute vapour pressureabove 1 barat pumping temperature

-40 … -5(-40 … 20)

< 21 (300)

A

3

53A53B or C21 … 41 (300 … 600)

-5 … 176(20 … 350)

< 21 (300) 53A53B or C21 … 41 (300 … 600)

176 … 260(350 … 500)

< 21 (300) C 02+53A21 … 41 (300 … 600) ES 02+53C

260 … 400(500 … 750)

< 21 (300) C 02+53A21 … 41 (300 … 600) ES 02+53C

Optional seal typewhen specified

Temperature °C (°F)

Pressure bar g (PSI)

Mechanical seal Supply system

Type Arr.1) API plan2)

Non

-hyd

roca

rbon

s

Water< 80 (180)

< 21 (300) B or C 11121 … 41 (300 … 600)

ES 1> 80 (180) < 41 (600)

Sour water

< 80 (180)

< 21 (300) B or C 132

21 … 41 (300 … 600) ES 1

Caustic, amines, crystallize< 21 (300) B or C 1

6221 … 41 (300 … 600) ES 1

H 2SO4 (max. 20% at 25 °C)< 21 (300) B or C 3 53A

H 3P04 (max. 20% at 80 °C)

All other acids – ES 3 note 3)

Non

-flas

hing

hyd

roca

rbon

s

Absolute vapour pressureless than 1 barat pumping temperature

-40 … -5(-40 … 20)

< 21 (300)B or C 3 53A

21 … 41 (300 … 600) ES 3 53B

-5 … 176(20 … 350)

< 21 (300)B or C 3 02+53A

21 … 41 (300 … 600) ES 3 53B176 … 260(350 … 500)

< 21 (300) ES 3

note 3)21 … 41 (300 … 600) – –

260 … 400(500 … 750)

< 21 (300) ES 321 … 41 (300 … 600) – –

Flas

hing

hyd

roca

rbon

s

Absolute vapour pressureabove 1 barat pumping temperature

-40 … -5(-40 … 20)

< 21 (300)

ES3

53A21 … 41 (300 … 600) 53C

-5 … 176(20 … 350)

< 21 (300) 02+53A21 … 41 (300 … 600) 02+53C

176 … 260(350 … 500)

< 21 (300) 02+53A21 … 41 (300 … 600) 02+53C

260 … 400(500 … 750)

< 21 (300) 02+53A21 … 41 (300 … 600) 02+53C

1) A specific application may allow another seal arrangement. Please contact Sealmatic for further information.2) A specific application may allow additional or different API plans. Please contact Sealmatic for further information.3) The Sealmatic seal type and the API plan(s) are dependant on the specific operation conditions.

Seal Selection by Media Groups

7

Operating limitsp 1(max) = 41 bar g (600 PSI)t1 = -40…176 °C (-40 … 350 °F)v g(max) = 23 m/s (75 ft/s)

Materials*)Face: Carbon (A), SiC (Q1 , Q2)Seat: SiC (Q1 , Q2)O-rings: FKM, FFKM, EPDM, NBR, HNBR …Springs: Alloy C-276 **)

Other parts: SS316 (1 .4571)

B750VN

B750VP

B750VK

SBV

With pumping ring.

Operating limits and materials*)see B750VN

With reverse pressure feature.

Operating limits and materials*)see B750VN

With reverse pressure feature, stationary springs.

Operating limitsp1 (max) = 41…150 bar g (600…2,115 PSI)t1 = -40…176 °C (-40 …350 °F)v g(max) = 50…60 m/s (164…229 ft/s)

Materials*)Face: Carbon (A), SiC (Q1 , Q2), Seat: SiC (Q1 , Q2)O-rings: FKM, FFKM, EPDM, NBR, HNBR …Springs: Alloy C-276**)Other parts: SS316 (1 .4571)

Operating limits refer to default seal face combination Carbon/SIC

*) Default and optional materials available.**) in C-4 available, Sealmatic recommendation.

Pusher SealsType A

8

Metal Bellows SealsType B and C

UFL850N for arrangement 1 and 2 (external pressurization)UFL900N for arrangement 3 (internal pressurization)

Operating limitsp1 (max) = 25 bar g / 23 bar g (363 PSI / 334 PSI)t1 = -40…176 °C (-40…350 °F)v g(max) = 23 m/s (75 ft/s )

Materials*)Face: Carbon (A), SiC (Q1 , Q2), Seat: SiC (Q1 , Q2) O-rings: FKM, FFKM, EPDM, NBR, HNBR…, Other parts: SS316 (1 .4571) Bellows: Alloy C-276 (in Alloy 718 available, Sealmatic recommendation)

With pumping ring.

Operating limits and materials*)see UFL850/900N

With stationary bellows.

Operating limitsp1 (max) = 25 bar g (363 PSI)t1 = -40…400 °C (-40…750 °F)v g(max) = 50 m/s (164 ft/s)

Materials*)Face: Carbon (A), SiC (Q1 , Q2), Seat: SiC (Q1 , Q2)O-rings: Flexible graphiteBellows: Alloy 718Other parts: SS316 (1 .4571), Ni42 (1 .3917)

With rotary bellows. UFLWT800 for arr. 1 and 2 (ext. press.), UFLWT900 for arr. 3 (internal pressurization).

Operating limitsp 1(max) = 25 bar g / 23 bar g (363 PSI / 334 PSI)t1 = -20…400 °C (-4…750 °F)For temperatures below -20 °C (-4 °F) UFLCT 800/920v g(max) = 23 m/s (75 ft/s)

Materials*)Face: Carbon (A), SiC (Q1 , Q2), Seat: SiC (Q1 , Q2)O-rings: Flexible graphite, Bellows: Alloy 718Other parts: SS316 (1 .4571), Ni42 (1 .3917)

Operating limits refer to default seal face combination Carbon/SIC.

Default and optional materials available.

We

We

UFL850P

UFL650

UFLWT800/900

UFL850N/900N

*)

9

Operating limitsp 1(max) = 25 bar g (363 PSI)t1 = -20 … 176 °C (-4 … 350 °F)v g(max) = 23 m/s (75 ft/s)

MaterialsFace: Carbon (A), SiC (Q1 , Q2)Seat: SiC (Q1 , Q2)O-rings: FKM, FFKM, EPDM, NBR, HNBR …Springs: Alloy C-276**)Other parts: SS316 (1 .4571)

CSNon-contacting containment seal

Operating limitsp 1(max) = 2 bar g (29 PSI), dry operationt1 = -40 … 176 °C (-40 … 350 °F)v g(max) = 23 m/s (75 ft/s)

In the event of primary seal failure the CS will work as a conventional wet lubricated seal in pressures up to 60 bar g (870 PSI) for at least 8 hours. MaterialsFace: Special carbonSeat: Pressureless sintered SiCO-rings: FKM, FFKM, EPDM, FVMQ …Springs: Alloy C-276Other parts: SS316 **) in C-4 available, Sealmatic recommendation.

CSContacting containment seal

Containment Seals Type A

A containment seal is a safety seal. In case of primary seal failure it shall operate for a minimum of 8 hours at seal chamber conditions. It can be found in the default configuration ''2CW-CS'' and the optional configuration ''2NC-CS''

Containment seals can be of non-contacting or contacting kind. Non-contacting containment seals feature aerodynamic grooves which provide a reliable lift-off of the seal faces even at low velocities.

Contacting containment seals are used in connection with liquid buffer systems but may also be used as dry running seal in connection with a Nitrogen purge.


Materials*)Face: Carbon (A), SiC (Q1 , Q2)Seat: SiC (Q1 , Q2)O-rings: FKM, FFKM, EPDM, NBR, HNBR …Springs: Alloy C-276**)Other parts: SS316 (1 .4571)





Operating limits refer to default seal face combination Carbon/SIC.*) Default and optional materials available. **) in C-4 available, Sealmatic recommendation.

3NC-BB

3NC-BB

3NC-FB

Gas SealsType A

10

Plan 23Used for hot liquidapplications or where

the temperatureand pressure in the

seal chamber isclose to the vapour

curve of the product.Recirculation by

means of a pumpingring in seal chamberthrough a cooler and

back to seal chamber.

Plan 31Used in applications

with suspended solids where the SG

of the particles is 2x that of the liquid.

Recirculation from pump discharge

through a cyclone separator, clean fluid

to seal chamber, dirty fluid to suction.

Plan 22 (21 )Used for hot applications or where

the temperature and pressure in the

seal chamber is close to the vapour

curve of the product. Recirculation from

pump discharge through a flow control orifice and cooler into

the seal chamber.

Plan 21: Without strainer St

St

Plan 01For general

applications. Product pumped is clean, good lubrication

properties and heat removal from the mechanical seal.

Internal circulation from the pump

discharge to the seal.

Plan 02Seal chamber

cooling and neck bush are necessary,

unless otherwise specified. Dead

end seal chamber with no circulation.

Plugged connections for possible future

circulation and quench.

Plan 13

Used where the seal chamber pressure is

at discharge pressure (mainly vertical

pumps). Recirculation from seal chamber

through a flow control orifice and back to

pump suction

Plan 11 (12)

Used when the product being

pumped has occasional particles

only. Recirculation from pump discharge

through a strainer and flow control orifice to

the seal.

Plan 12: With strainer St

St

Plan 14Used where cooling

flow is supplied to seal while providing

venting of seal chamber (generally

used for vertical pumps). Recirculation from pump discharge

through a flow control orifice to the seal and

simultaneously from the seal chamber through a control

orifice to pump suction.

Plan 32 Used when the product being

pumped does not have good lubrication

properties, contains suspended solids or is hazardous. Flush

injecton of clean fluid into the seal chamber

from an external source.

Plan 41 Used in applications

with suspended solids where the SG

of the particles is 2 x that of the liquid.

Temperature and pressure in the seal chamber is close to the vapour pressure

of the product.Recirculation from

pump discharge through a cyclone

separator, delivering clean fluid to a cooler

and then to the seal chamber.

cyclone separator

API PlansProcess Side

11

Plan 75Application

when pump fluid condenses at ambient

temperatures. Containment seal chamber drain for

condensing leakage.

A C

B

Plan 76Application where

pump fluid does not condense at

ambient temperature. Containment seal

chamber vent for non-condensing leakage.

Device to be located below pump shaftTo drainTo flare

C

A

C

B

Plan 74Used in applications where the product is

harmful/hazardous. Externally supplied barrier gas used to

positively prevent process fluid

from leaking to atmosphere.

Pressure of barrier gas higher than seal

chamber pressure.

N 2A

A

connect to plan 75connect to plan 76N 2

quench connection to be located downwards

A

B

C

D

Plan 72 (71)Applicable with

hydrocarbons normally used in conjunction with

plan 75 or plan 76. Externally supplied

gas buffer (pressure lower than seal

chamber pressure). Buffer gas may be used to dilute seal

leakage.

A B

C

Plan 71: Plugged connections

Plan 51Used with products that usually solidify when coming into contact with air /

ambient temperature. External reservoir providing a dead-ended blanket for

fluid to the quench connection of the

gland.

Plan 52Used where the pumped product is

harmful / hazardous and / or buffer fluid

may not contaminate the product. External reservoir at pressure below seal chamber

pressure. Pumping device providing

buffer liquid forced circulation.

Plan 53BUsed for applications where products have

high pressure and are harmful/hazardous.

Pre-pressurized bladder accumulator provides pressure to

circulation system. Heat removed by air/

water heat exchanger. Pumping device providing forced

circulation.

Plan 53AUsed for hot

applications or where products

have low pressure and are harmful/

hazardous. External reservoir pressurized above seal chamber

pressure providing barrier fluid to

mechanical seals. Pumpng device

providing forced circulation.

A

Plan 53CUsed for applications where products have

high pressure and are harmful/hazardous.

Pressurization by reference line from seal chamber to a

piston accumulator provides pressurized

barrier fluid. Pumping device providing

forced circulation.

N 2A

Plan 54Used in harmful/

hazardous applications.

Pressurized clean barrier fluid from

an external system. Fluid circulation by

an external pump or pressure system.

thermosiphon system

API PlansBetween seals

12

API PlansAtmospheric side

Used for leakage detection

on single seal. Atmospheric side

leakage collection and monitoring (alarm high) in external vessel.

Plan 65A

B

Plan 62 (61 )Used to keep

atmospheric side of seal clean. External source providing a

flow-through quench at atmospheric side.

D

Plan 61: Plugged Quench connection

Selection of Buffer and Barrier Mediums

Sealed fluid Barrier/buffer fluid Special notes General demands

Above 10 °C

Hydrocarbon fluid

100 mm2/s at 38 °C and1 mm2/s to 10 mm2/s at 100 °C

Three years continuous operation without adverse deterioration.Non-critical normal buffer/barrier fluid leakage.Compatibility with the sealed medium.Compatibility with the materials of the sealing systeminitial boiling point min. 28 °C above exposed temperature.Flash point > service temperature (if O2 is present).Compatibility with max./ min. process temperature.Freezing temperature < ambient temperature at site.Viscosity < 500 mm 2/s at minimum temperature.Viscosity over the entire operating-temperature range.Consider gas solubility in viscous barrier fluids (> 10 bar).

Below 10 °C5 mm2/s to 40 mm 2/s at 38 °C and1 mm2/s to 10 mm2/s at 100 °C

Aqueous streams

Mixture of water and ethylene glycol

Ethylene glycol may be considered as hazardous material and/or waste

Don‘t use commercially available automotive antifreeze (plating of additives at seal parts)

Mixture of water and propylene glycol

Hydrocarbon streamsParafin-based high purity oils

With little or no additive for wear/oxidation resistance (plating of additives at seal parts)

Synthetic-based oils –

ISO 21049API 682

Seal categoryStep I

Seal arrangementStep II

Seal typeStep III

API plansStep IV

Letters and numbers C1, C2, C3 A1, A2, A3 A, B, C01 , 02, 1 1 , 12, 13, 14, 21 , 22, 23, 31 , 32, 41 , 51 , 52, 53A, 53B, 53C, 54, 61 , 62, 65, 71 , 72, 74, 75, 76

Note

Arrangement 1 can be a 1CW-FX or 1CW-FLArrangement 2 can be a 2CW-CW, 2CW-CS or 2NC-CS Arrangement 3 can be a 3CW-FB, 3CW-FF, 3CW-BB, 3NC-FB, 3NC-FF or 3NC-BB

Seal materials are not part of this code (default materials assumed)

A code for engineered mechanical seals (ES) is not specified

ExampleFeatures: category 2, arrangement 2, type A, flush plan 1 1 and flush plan 52

Code: C2A2A1152

13

Objectives and Category Details

*) All technical specifications are based on extensive tests and our many years of experience. The diversity of possible applications means, however, that they can serve only as guide values. We must be notified of the exact conditions of application before we can provide any guarantee for a specific case. Subject to change.**) API / ISO paragraphs in brackets***) Please also ask for Sealmatic CTX API mechanical seals

API 682 and ISO 21049**) Category 1∗∗∗) Category 2 Category 3

Objective 1*): seal operation Continuously for 25,000 h without need for replacement

Objective 2*): containment seal operationAt least 25.000 h without need for replacement at any containment seal chamber pressure equal to or less than the seal leakage pressure switch setting (< 0,7 bar g (10 PSI)) and for at least 8 h at the seal chamber conditions.

Objective 3*): emissionsComplying with local emissions regulations or exhibiting a maximum screening value of 1 ,000 ml/m3 (1 ,000 ppm vol.) as measured by the EPA Method 21 , whichever is more stringent.

Basic design features (4.1 .3 / 6.1 ) Balanced mechanical seal, inside-mounted, cartridge design, type SS316 (1 .4571) or better for sleeve and housing

Throttle bushing requirement for arrangement 2 and 3 seals (7.2.3 / 7.3.3.1 )

Fixed carbon, if specified

Flush connection to the process sidefor arrangement 3 seals (7.3.3.2)

If specified

Shaft diameter (1 ) 20 mm (0.75 inch) to 110 mm (4.3 inch)

Seal chamber size (4.1 .2)ISO 3069 type C, ASME B73.1 and ASME B73.2

ISO 13709 / API 610 10th edition

Cartridge seal sleeve size increments required

None 10 mm increments (6.2.2.3.1 )

Temperature range (4.1 .2) -40 to 260 °C (-40 to 500 °F) -40 to 400 °C (-40 to 750 °F)

Pressure range, absolute (4.1 .2) 22 bar a (315 PSI) 42 bar a (615 PSI)

Face materials (6.1 .6.2)Premium blister-resistant carbon (A) vs. self-sintered silicon carbide (Q1)

Premium blister-resistant carbon (A)vs. reaction-bonded silicon carbide (Q2)

Gland plate metal-to-metal contact requirement

Required (6.2.1 .2.2) Required inside and outside the stud circle diameter (6.2.2.2.2)

Tangential buffer/barrier fluid outlet for arr. 2 and 3 seals (7.2.4.2 / 7.3.4.3)

If specified Required

Throttle bushing design requirement for arrangement 1 seals (7.1 .2.1 )

Fixed carbon Fixed, non-sparking metalFloating carbon

Floating carbon option (7.1 .2.2)

Scope of vendor qualification testTest as category 1 Test as category 2 Test as category 3, entire seal

assembly as a unit (10.3.1 .2.2)Unless faces interchangeable with category 3 (10.3.1 .2.3)

Distributed inlet flush requirements arr. 1 and 2 with rotating flexible element

When required or if specified (6.1 .2.14 / 6.2.1 .2.1 ) Required (6.2.3.2)

Seal circulation device head flow curve provided (8.6.2.2)

If specified Required

Proposal data requirements (11 .2.1 )Minimal Rigorous

Contract data requirements (11 .3.1 )

14

Year

2004

2003

2002

1996

1995

1990

Pump specification

API 610, 10th edition

-

ISO 13709



-


Note

Same wording and structure as in the ISO documents

Enhancements to API 682, 2nd edition

Enhancements to API 610, 9th edition

Seal chambers in API 610, new seal coding system in API 682

References API 682 1st edition

First stand alone API seal standardRevised seal coding system

Contains basic seal specificationDefines seal coding system

Mechanical seal specification

API 682, 3rd edition

ISO 21049

-

-

API 682, 1st edition

-

API 682, 2nd edition

Disclaimer:

The specifications, drawings, images etc included in this catalogue are intended to be generic and must be interpreted as equivalent or functionally equivalent. The identification of many items is facilitated by illustrations (photographs and general assembly drawings) and mention of, or reference to any specific standards, or trade names, including those that might appear on the photographs, drawings, images etc is intended for illustration purposes only, and does not imply an endorsement or imitation or preference of any specific standard, brand, manufacturer or supplier. Neither does the information imply the availability of any mentioned items. The items discussed alongwith the images, drawings etc portrayed are representative of industry catalogues, standards, terminology and specifications hence, accounting for any resemblance which otherwise may be co-incidental.

This Catalogue does not contain any guarantee or agreed quality of products or any warranty of merchantability, fitness for a particular purpose and non-infringement. The data and information contained herein are being provided for information only and without responsibility, and Sealmatic makes no representations or warranties, either expressed or implied, as to the accuracy, completeness, or fitness for a particular purpose. Sealmatic does not accept any responsibility or liability with regard to the reliance on, or use of this data and information.

Sealmatic is continuously improving and upgrading their products with respect to quality and application and therefore any changes made to the catalogue may be made without any notice.

application engineering api 682 - sealmaticindia.com · step iv: completes the sealing system...

Documents