API 682 3rd for Training

7/22/2019 API 682 3rd for Training

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Module 1 Revision 1.2 1

Trainer : MS Jo/Engineering Director

Nov 2011


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Topics

Review of API 682 First Edition Mission Statement

API 682 Second Edition

ISO 21049 and API 682 Third Edition Scope of Standard

Key Concepts

Seal Types Seal Arrangements

Categories

API Pipe Plan


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Review of API 682 First Edition

Created by industry

leaders in rotating

equipment

Designed to capturefield experience

Defaults to proven

solutions

Applies to the most

common applications


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Mission Statementfrom API 682 First Edition

This standard is designed to default to the

equipment types most commonly

supplied that have a high probability ofmeeting the objective of a least three

years of uninterrupted service while

complying with emissions regulations.


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API 682 Second Edition

Success of FirstEdition

Applications outside ofrefineries

Application to non-API610

Advancement insealing technology

Creation of anInternational standard


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ISO 21049

Review of API 682Second Edition byworldwide ISO membercountries

Reorganization of somechapters

Rewording of someclauses

Error corrections

Modified piping planselection flowchart

New piping plan


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API 682 Third Edition

Release of ISO

21049 created two

standards that were

not identical Third Edition

released to make

682 identical to ISO

21049



Scope of StandardComparison of Editions

First Edition Second Edition, ISO

21049, Third Edition

Size Seal sizes from1.50 to 4.50

(30mm to 120mm)

Shaft diameters from

0.75 to 4.30

(20mm to 110mm)

Temperature -40F to 500F

(-40C to 260C)

-40F to 750F

(-40C to 400C)

Pressure (absolute) 0 to 515 PSIA

(0 to 34.5 bar)

0 to 615 PSIA

(0 to 42 bar)

Fluids Water, sour water, caustic,amines, some acids, most

HCs

Water, sour water, caustic,

amines, some acids, most

HCs

Pumps API-610, ISO 13709 ANSI/ASME B73.1 andB73.2, ISO 3069 Frame C,

API-610, ISO 13709



Key Concepts

Terminology

Seal Types

Seal Arrangements

Seal Categories



Seal Types

Over the years, seal companies havereleased numerous designs andvariations

No standardization in seal designs,materials, or dimensions

Challenge for API 682 Task Force wasto create standard seal types definingseal design, materials, installationenvelope, and operating windows



Type A Seal

Rotating flexible element, multiple springs, O-ring secondaries

Silicon Carbide versus premium grade blister resistant Carbon

Fluoroelastomer O-rings (FKM) Alloy C276 springs (316 for single spring option)

Type 316 SS sleeve, gland, and other metal parts

Throttle bushing in gland


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Type B Seal

Rotating bellows, O-ring secondaries


Fluoroelastomer O-rings (FKM) Alloy C-276 bellows

Type 316 SS sleeve, gland, and other metal parts

Throttle bushing in gland



Type C Seal

Stationary bellows, flexible graphite secondaries


Alloy 718 bellows Type 316 SS sleeve, gland, and other metal parts

Premium carbon floating bushing in gland

Bronze anti-coke device



Rotating vs Stationary

The default Type A and Type B seals have arotating flexible element

A stationary flexible element is an alternate

The default Type C seal has a stationaryflexible element

A rotating flexible element is an alternate

If surface speed at the faces exceeds 4500

ft/min (23 m/s), a stationary flexible element

must be used



Seal Arrangements

The seal arrangement defines thenumber or seals, their orientation, anddetails about the seals operation

Designations Contacting wet (CW)

Containment seals (CS) Non-contacting dry-running

Contacting dry-running Non-contacting (NC)

Wet running seals

Dry-running dual seals



Contacting Wet Seal - CW

Typical mechanical seal

Mechanical seal designed to run onliquid fluid film

Does not intentionally createhydrodynamic forces

Requires vapor suppression to keep

fluid in a liquid phase Designed to run for a minimum of

25,000 hours



Containment Seal - CS

Designed as a dry running backup seal Outer seal in a dual non-pressurized

arrangement

May be either a non-contacting orcontacting design

Operates on buffer gas or vaporized

process fluid Run for 25,000 hours at 10 PSI and at

least 8 hours under process conditions



Non-Contacting Seal - NC

May be used as a primary seal or as a

dual pressurized seal

Seal is designed to create

hydrodynamic forces to separate thefaces under all operating conditions

Designed to run for a minimum of

25,000 hours


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Arrangement 1

1CW-FX or 1CW-FL configuration

Single mechanical seal

May have a fixed or floating throttle bushing

May have single point or distributed flush


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Arrangement 2Liquid Buffer Fluid

2CW-CW configuration

Dual non-pressurized seal with a liquid bufferfluid

Same as the First Edition Arrangement 2 seal


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Arrangement 2Vapor or No Buffer Fluid

2CW-CS configuration

Contacting wet seal with a dry runningcontainment seal

Containment seal may be either contacting ornon-contacting


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Arrangement 2Vapor or No Buffer Fluid

2NC-CS configuration

Inner seal is designed to be non-contacting

and operate with liquid, vapor, or mixed phaseprocess

Outer seal a containment seal


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Arrangement 3Liquid Barrier Fluid

3CW-FB configuration

Contacting wet seals oriented in a series (orface-to-back) orientation

Default Arrangement 3 liquid seal

Same as the First Edition Arrangement 3 seal


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Arrangement 3Liquid Barrier Fluid

Alternate designs for

Arrangement 3

liquid seals

3CW-BB or 3CW-FFconfigurations

May be required for

specific applicationor pump designs


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Arrangement 3Gas Barrier Fluid

3NC-BB configuration

Default Arrangement 3 gas seal Non-contacting gas seals in a back-to-back

orientation


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Arrangement 3Gas Barrier Fluid

Alternate designs for

Arrangement 3 gas

seals

3NC-FF or 3NC-FBconfigurations

May be required for

specific applicationor pump designs


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Categories

Different applications may require

different levels of seal sophistication

Current practice of specifying modified

API-682 seals

Size restrictions based on pump

construction

Cost impact of seals


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Categories

Three categories

Category 1General duty services in

chemical pumps

Category 2Heavy duty services;similar to API-610 7thedition seals

Category 3Heavy duty services;

similar to API 682 First Edition seals


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Comparison of Categories

FEATURE CATEGORY 1 CATEGORY 2 CATEGORY 3

Seal chamber size ISO 3069 Type C,

ANSI/ASME B73

ISO 13709/API 610 ISO 13709/API 610

Temperature range -40C to 260C

-40F to 500F

-40C to 400C

-40F to 750F

-40C to 400C

-40F to 750F

Pressure range

absolute

22 bar

315 PSIA

42 bar

615 PSIA

42 bar

615 PSIA

Face materials Carbon vs self-

sintered SiC

Carbon vs reaction

bonded SiC

Carbon vs reaction

bonded SiC

Distributed flush

requirements

When required or

specified

When required or

specified

Required

Gland plate metal

to metal contact

Required Required inside

and outside bolt

circle diameter

Required inside

and outside bolt

circle diameter


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Comparison of Categories

FEATURE CATEGORY 1 CATEGORY 2 CATEGORY 3

Seal sleeve size

increments

None 10mm increments 10mm increments

Throttle bushing

requirements

Fixed carbon,

floating carbon

optional

Fixed non-sparking

metal, floating

carbon optional

Floating carbon

Pumping ring HQ

curve required

No If specified Required

Scope of vendor

qualification test

Test as Category 1

unless faces tested

as Category 3

Test as Category 1

unless faces tested

as Category 3

Test as Category 3

as entire seal

assemblyProposal document

requirements

Minimal Minimal Rigorous including

qualification tests

Contract data

requirements

Minimal Minimal Rigorous


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Review

API 682 Second Edition represents a majorrevision over the First Edition

ISO 21049 and API 682 Third Edition provideadditional refinement to the standard

The Standard has categorized three types ofseals: Type A, B, and C

There are three basic arrangements:Arrangement 1, 2, and 3

To address differing needs for features anddocumentation, there are three categories ofseals: Category 1, 2, and 3


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Module 4 Revision 1.2

Piping Plans

The complete listing of piping plans is covered inAnnex

Continuation of piping plans from the First Edition

New piping plans introduced in Second Edition: Moved over from API 610

Variations of dual pressurized liquid plans

Plans for containment and dual gas seals

New piping plans introduced in ISO 21049 / API 682Third Edition:

Detection of atmospheric side leakage


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Plan 14


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Plan 53A


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Plan 53B


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Plan 53C


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Plan 65


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Plan 71


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Plan 72


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Plan 74


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Plan 75


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Plan 76


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Seal Code

Informative

Different from 1stEdition

Different from API 610

Four segment code

First segmentseal category (C1, C2, C3)

Second segmentarrangement (A1, A2, A3)

Third segmentseal type (A, B, C)

Fourth segmentpiping plan (e.g. 11)


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Seal Code

C1A1B11 Category 1 seal

Arrangement 1 (single seal)

Type B seal (bellows)

Plan 11 C3A3A53B

Category 3 seal

Arrangement 3 (dual pressurized seal)

Type A seal (pusher) Plan 53B (liquid barrier fluid pressurized

by a bladder accumulator)


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Thank you

for

your Attention.

Documents

API 682 3rd for Training