threads and sealing methods

Download Threads and Sealing Methods

Post on 08-Apr-2015

853 views

Category:

Documents

1 download

Embed Size (px)

DESCRIPTION

Identifying Threads, Sealing Methods and Industrial FittingsModule ObjectivesExplain the basic thread characteristics necessary to identify threadsModule ObjectivesExplain the basic thread characteristics necessary to identify threads Differentiate between and identify various types of threads used on industrial fittingsModule ObjectivesExplain the basic thread characteristics necessary to identify threads Differentiate between and identify various types of threads used on industrial

TRANSCRIPT

Identifying Threads, Sealing Methods and Industrial Fittings

Module ObjectivesExplain the basic thread characteristics necessary to identify threads

Module ObjectivesExplain the basic thread characteristics necessary to identify threads Differentiate between and identify various types of threads used on industrial fittings

Module ObjectivesExplain the basic thread characteristics necessary to identify threads Differentiate between and identify various types of threads used on industrial fittings Explain the various sealing methods used for the different fittings

Module ObjectivesExplain the basic thread characteristics necessary to identify threads Differentiate between and identify various types of threads used on industrial fittings Explain the various sealing methods used for the different fittings Identify different types of fittings being used in the industrial market place

Thread Characteristics

Thread CharacteristicsPitchThread pitch is the distance between a single thread

Thread CharacteristicsPitch:Pitch is sometimes written as the number of threads within one inch distancee.g. 8 threads per inch

Thread CharacteristicsFlank Angle and Taper Angle:

Thread CharacteristicsCrest and Root:Root Crest

Thread CharacteristicsMajor Diameter or OD:

Thread Style and Function

Thread StylesPort End Threads:Parallel

Parallel

Thread FunctionsParallel Threads:Parallel threads only serve the function of holding in the fitting Sealing is achieved by some other means, such as with an O-ring

Thread StylesPort End Threads:Tapered

Tapered

Thread FunctionTapered Threads:Tapered threads serve two functions:For holding in the fitting Sealing (even though sealing is usually assisted with additional sealant)

Thread ID Tools

Thread ID ToolsMIK-1 kit Port Boards Known Threads Markings and Tables

Thread ID ToolsMIK-1 kitCaliper Thread gages Thread profiles Instruction booklet Nose angle indicator

Thread ID ToolsMIK-1 kitCaliperUsed to measure outside and inside diameter in either inch or metric units

Thread ID ToolsMIK-1 kitThread gagesUsed to compare thread form to determine pitch

Thread ID ToolsMIK-1 kitThread profilesUsed to shadow pipe threads for determining nominal size

Thread ID ToolsMIK-1 kitNose angle indicatorUsed to determine whether nose angle or seat is 37 or 45

Thread ID ToolsMIK-1 kitInstruction booklet (4303-B1)Contains specifications for various thread forms

Thread ID ToolsPort BoardUsed to determine male thread size based on comparison with known threads

Thread ID ToolsOther Known ThreadsTube nuts or other components where threads can be used for comparison

Thread ID ToolsMarkings and TablesIn some cases, fittings are marked with a cross reference for threads Tables can be used to identify threads based on given characteristics

Identifying Threads

Identifying ThreadsSteps for Identifying Thread Forms: 1a. Verify if parallel or taperedVisual inspection

Identifying ThreadsSteps for Identifying Thread Forms: 1b. Verify if parallel or taperedCompare with a known parallel

Identifying ThreadsSteps for Identifying Thread Forms: 2. Determine thread pitchUse thread gages

Bad Fit

Good Fit

Identifying ThreadsSteps for Identifying Thread Forms:3a. Determine sizeMeasure with caliper or compare with thread profile

Identifying ThreadsSteps for Identifying Thread Forms 3b. Determine SizeCompare with Profile

Identifying ThreadsSteps for Identifying Thread Forms: 4. Define threadThreads are called out according to the type of thread They usually follow a standard pattern and this is how they may appear on a print

Identifying ThreadsSteps for Identifying Thread Forms: 4. Define threadNPT/NPTF - American Pipe Thread Example: 1/4-18 NPT1/4 = nominal size 18 = pitch (threads per inch) NPT or NPTF usually specified or NPT/NPTF where it does not matter if it is either one

Identifying ThreadsSteps for Identifying Thread Forms: 4. Define threadUN/UNF - Unified (SAE Straight Thread) Example: 9/16-18 UNF9/16 = actual size 18 = pitch (threads per inch) UN or UNF usually specified or UN/UNF where it does not matter UNF is usually used for thread pitch above 12 TPI

Identifying ThreadsSteps for Identifying Thread Forms: 4. Define threadBSPT - British Standard Pipe, Tapered Example: R3/8R signifies tapered 3/8 = nominal size The pitch is usually assumed based on known standard Japanese taper thread would be written as PT 3/8

Identifying ThreadsSteps for Identifying Thread Forms: 4. Define threadBSPP - British Standard Pipe, Parallel Example: G3/4G signifies parallel 3/4 = nominal size The pitch is usually assumed based on known standard Japanese parallel thread would be written as PF 3/8

Identifying ThreadsSteps for Identifying Thread Forms: 4. Define threadMetric Parallel Example: M22X1.5M signifies metric 22 = actual size in mm 1.5 = pitch (distance between threads in mm)

Identifying ThreadsSteps for Identifying Thread Forms: 4. Define threadMetric Tapered Example: M10X1 keg (or tapered)M signifies metric 10 = actual size in mm 1 = pitch (distance between threads in mm) keg is the abbreviation for the German word meaning tapered and if the thread is tapered, it will be specified

Port End Sealing Methods

Port End Sealing MethodsFemale Port O-ring in chamferAvailable withUN/UNF (SAE J1926) Metric (ISO 6149) BSPP (JIS B2351)

Port End Sealing MethodsO-ring in chamfer (Male end)Most reliable form of sealing Available in adjustable fittings ISO 6149 has special identification

Port End Sealing MethodsFemale Port Spot face sealingAvailable withMetric (DIN 3852-1) BSPP (DIN 3852-2)

Wide variety of interchangeable male ends

Port End Sealing MethodsO-ring in grooveDIN 3852 Type EO-ring not round in cross section Adjustable not possible Second in pressure holding capacity

Port End Sealing MethodsO-ring w/ retaining ringDIN 3852 Type G & HSeparate metal ring surrounding o-ring Adjustable fittings are type H

Port End Sealing MethodsBonded SealDIN 3852 Type DElastomer bonded to metal ring Undercut on fitting has taper angle Adjustable not possible

Port End Sealing MethodsHard metal sealDIN 3852Typically used on Banjo fittings Seals by coining surface of port Limited reusability Useful for extreme temperatures Adjustable not possible

Port End Sealing MethodsSoft Metal SealDIN 3852 Type ASeal material usually copper Adjustable not possible Undercut area has taper angle

Port End Sealing MethodsCutting Face SealDIN 3852 Type BSharp edge on fitting coins spotface for sealing Limited reusability Adjustable not possible Useful for extreme temperatures

Port End Sealing MethodsFemale Port

Taper threadsAvailable withNPT/NPTF (SAE 476) BSPT (DIN 3852-2) Metric taper (DIN 3852-1)

Sometimes female port has parallel threadsTapered male into female parallel allowed

Port End Sealing MethodsTaper threadsSealing initiated by thread interference Additional sealant usually required Prone to fatigue failure Prone to galling

Tube/Hose End Sealing Methods

Tube End IdentificationTube/Hose EndsO-ring face seal (flat face seal) 37 flare 45 flare 24 flareless JIS 30 flare and 60 cone BSI (BSPP) 60 cone NPSM/NPT

Tube End IdentificationTube/Hose EndO-ring face sealSAE J1453 ISO 8434-3 UN/UNF Thread Hose,Inch or metric tube

Tube End IdentificationTube/Hose End37 flareSAE J514 ISO 8434-2 UN/UNF Thread Hose, Inch or metric tube

Tube End IdentificationTube/Hose End45 flareSAE J512 UN/UNF Thread Hose, Inch tube

Tube End IdentificationTube/Hose End24 flarelessSAE J514 UN/UNF Thread Hose, Inch Tube

Tube End IdentificationTube/Hose End24 flarelessDIN 2353 ISO 8434-1 Metric Thread Hose, Metric Tube 3 pressure series

Tube End IdentificationHose EndJIS ConeB8363 BSPP Thread 60 cone Hose connection

Tube End IdentificationHose EndJIS FlareB8363 BSPP Thread 30 flare Hose connection

Tube End IdentificationHose EndKomatsu FlareMetric Thread 1.5 mm pitch (all sizes) 30 flare Hose connection

Tube End IdentificationHose/Port EndBSPP coneBS B5200 BSPP thread 60 cone Hose connection

Tube End IdentificationHose/Port EndNPTF/NPSMSAE J516 NPT/NPTF male thread NPSM female thread 30 chamfer or 60 cone Hose connection

Identifying Metric 24 Flareless Fittings

Identifying Metric 24 Flareless FittingsIdentify markingsManufacturer s logo Material code Tube size Pressure series

Identifying Metric 24 Flareless FittingsDetermine Tube SizeMeasure sleeve ID

Identifying Metric 24 Flareless FittingsDetermine Tube SizeMeasure tube OD

Identifying Metric 24 Flareless FittingsDetermine Tube SizeMeasure fitting throat

Identifying Metric 24 Flareless FittingsDetermine Tube SizeMeasure opening in back of nut

Identifying Metric 24 Flareless FittingsDetermine thread pitch and size

Identifying Metric 24 Flareless FittingsVerify with specification tableTube OD (mm) Pressure Series 4 LL 6 LL 8 LL 10 LL 12 LL 6 L 8 L 10 L 12 L 15 L 18 L 22 L 28 L 35 L 42 L 6 S 8 S 10 S 12 S 14 S 16 S 20 S 25 S 30 S 38 S Thread size M8X1 M10X1 M12X1 M14X1 M16X1 M12X1.5 M14X1.5 M16X1.5 M18X1.5 M22X1.5 M26X1.5 M30X2 M36X2 M45X2 M52X2 M14X1.5 M16X1.5 M18X1.5 M20X1.5 M22X1.5 M24X1.5 M30X2 M36X2 M42X2 M52X2

JIS and BSPP 60 Cone Fittings

JIS and BSPP 60 Cone FittingsDifferencesThread length Chamfer diameter Undercut area Function (dual vs single) Interchangeability?

Hands on Exercise

Standards Activity and Industry Trends

Standards ActivityMerging of BSI and JIS 60 Cone Adapters ISO 16030 Pneumatic BSPP

Recommended

View more >