Prednáška. Vypracoval: Ing. Martin Juriga, PhD. Bratislava, marec 2016

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Dizajn procesných zariadení časť 3. Prednáška Vypracoval: Ing. Martin Juriga, PhD. Vedúci pracoviska: prof. Ing. Marián Peciar, PhD. Bratislava, marec 2016

Označovanie zvarov na výkresoch Slovensko: Pôvodná norma STN 01 3155 zrušená. Nahradená európskou normou STN EN 22553 Európa: EN 22553 čo je vlastne prebratá ISO 2553 USA: American Welding Society (AWS) ANSI/AWS A2.4-98

Označovanie zvarov na výkresoch ISO 2553 vs. ANSI/AWS A2.4-98

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch Arrow side (označená strana) Other side Other side (druhá strana)

Označovanie zvarov na výkresoch ISO 2553 Zvar ktorý je na ARROW SIDE (označená strana, strana so šípkou) sa znázorňuje tak, že značka zvaru sa umiestni NAD odkazovú (referenčnú) čiaru. Čiarkovaná čiara určuje polohu: Musí byť umiestnená POD odkazovou (referenčnou čiarou) )

Označovanie zvarov na výkresoch ANSI/AWS A2.4-98 Zvar ktorý je na ARROW SIDE (označená strana, strana so šípkou) sa znázorňuje tak, že značka zvaru sa umiestni POD odkazovú (referenčnú) čiaru. Rovnaké označenie platí pre ISO 2553: Čiarkovaná čiara musí byť umiestnená NAD odkazovou (referenčnou č čiarou) )

Označovanie zvarov na výkresoch Poloha čiarkovanej čiary určuje polohu symbolu zvaru Ak je čiarkovaná čiara dole zvar je nad referenčnou čiarou Ak je čiarkovaná čiara hore zvar je pod referenčnou čiarou

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch Pre obojstrané zvary platí rovnaké označenie. ISO 2553 AWS 2.4-98

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch Doplňujúce symboly Nad základným symbolom. Na odkazovej čiare

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch

Označovanie zvarov na výkresoch

Vo svete viac než 90 druhov závitov. Základné parametre závitu Stúpanie pitch / Thread pitch is the distance Stúpanie pitch / Thread pitch is the distance between a single thread/

Stúpanie pitch je niekedy vyjadrené ako počet závitov na palec. / Pitch is sometimes written as the number of threads within one inch distance /

- Flank /Thread/ Angle - Taper Angle - Crest - Root - O.D. Crest Root

Valcové / Parallel Kuželové / Taper Parallel Tapered

Valcové / Parallel or Straight Kuželové / Taper

Identifikácia: Caliper / Posuvné meradlo, šublera šublera /

Identifikácia: Thread gauge /Závitové mierky/ Bad Fit Good Fit

Identifikácia: Port Board, thread checkers,

Identifikácia: Instruction booklet /Contains specifications for various thread forms/

PIPE THREADS potrubárske závity ( závity na spájanie potrubí) Vychádzajú z WHITWORTH-ovho závitu.( jedným s prvých patentovaných priemyselných štandardov) WHITWORTH-ov závit Vrcholový uhol: 55 Stúpanie: počet závitov na 1 Označenie W ½

WHITWORTH-ov závit: ( u nás sa už veľmi ľ nepoužíva ) British Standard Whitworth (BSW) British Standard Fine Thread (BSF) British Standard Cycle (BSC) American Unified Coarse (UNC) American Unified Fine (UNF) Vzájomne sa líšia v rozdielnom stúpaní

Z Whitworth-ovho závitu je odvodený najpoužívanejší závit pri spájaní potrubí: RÚRKOVÝ (Trubkový) závit Vrcholový uhol: 55 Stúpanie: počet závitov na 1 Označenie: G 1 ½ G 1 (33,249mm) odpovedá rúrke svetlosti DN25 (33,7 mm)

Tesnenie na závite Tesnenie mimo závitu G valcový R kužeľový Rp valcový

Americké závity na potrubie. ( odvodené z menovitej svetlosti ti potrubia v palcoch (DN25-1 ) NPT - National Pipe Tapered Thread NPS - National Pipe Streight Thread Vrcholový uhol: 60 Stúpanie: počet závitov na 1 Označenie: NPT 1 ½ Sklon: 1:1616 M- male F- female napr. MNPT, NPT(F)

Metric thread Metrický závit Vrcholový uhol: 60 Označenie: M 12 x 1 Stúpanie -Pitch (P) LH ľavý

Not Sealing on the thread O-ring in the chamfer

Not Sealing on the thread O-ring in groove

Not Sealing on the thread O-ring w/ retaining ring retaining ring retaining ring

Not Sealing on the thread Soft Metal Seal, copper

Not Sealing on the thread Cutting Face Seal

Sealing on the thread Cutting Face Seal Sealing initiated by thread interference Additional sealant usually required Prone to fatigue failure Prone to galling Sealant