Tank lined nrog roj hmab (cov roj hmab mos, EPDM, lossis roj hmab tawv (ebonite)) yuav tsum tau txiav txim siab tshwj xeeb thaum mounting PFA heaters. Cov roj hmab hauv ob sab phlu compresses nyob rau hauv lub rhaub lub flange los yog compression haum. Cov roj hmab mos (Shore A 40-60) compresses yooj yim, tab sis nws cov qauv qis ua rau lub tshuab cua sov tig los yog tog hauv lub sijhawm thaum cov roj hmab creeps. Cov roj hmab tawv (Shore A 70–90, lossis ebonite) tiv thaiv compression tab sis tuaj yeem tawg yog tias dhau- nruj. Kev xaiv kom raug: rau cov hnab yas mos, siv lub loj- thaj chaw thaub qab phaj (stainless steel, 3-5 mm tuab, 2-3 × flange txoj kab uas hla) los faib cov load thiab tiv thaiv kev nkag. Rau cov tawv roj hmab hauv ob sab phlu, siv lub molded PFA flange nrog lub pav ca gasket (PTFE los yog roj hmab) thiab lub torque - txwv nruj (5-10 N·m rau M8 bolts). Tsis txhob nruab lub tshuab cua sov PFA ncaj qha mus rau cov roj hmab muag yam tsis muaj lub phaj rov qab; lub tshuab cua sov yuav tog thiab xau hauv lub lis piam.
Roj Hmab Hom Sib Piv
| Hom Roj Hmab | Ntug Hardness | Modulus (MPa) | Creep Rate | Compression Teeb | Haum rau Direct Heater Mounting? |
|---|---|---|---|---|---|
| Soft Natural Roj Hmab (NR) | 40–60 A | 1–3 | Siab (10-20% toj xyoo) | Siab (30-50%) | Tsis yog (yuav tsum tau rov qab phaj) |
| EPDM (mos) | 50–65 A | 2–4 | Nruab nrab | Nruab nrab (20-30%) | Tsis yog (yuav tsum tau rov qab phaj) |
| Neoprene (nruab nrab) | 60–75 A | 3–6 | Tsawg- Nruab nrab | Tsawg (10-20%) | Yog (nrog pav ca gasket) |
| Cov roj hmab tawv (ebonite) | 70–90 A (Ntaub D 20–30) | 50–200 | Tsawg heev | Tsawg heev (<5%) | Yog (ceev faj torque) |
| PTFE (kev siv) | 50–65 D | 500–700 | Tsis muaj | Tsis muaj | Yog (zoo tagnrho) |
Mounting Solutions los ntawm Lineing Hom
| Khoom siv hauv ob sab phlu | Rhaub Mount Hom | Backing Phaj yuav tsum tau | Gasket Khoom | Torque (Nm rau M8) | Txaus ntshai |
|---|---|---|---|---|---|
| Cov roj hmab mos (NR, EPDM) | Compression haum | Yog, stainless hlau 5 hli tuab, 150 hli txoj kab uas hla | Roj hmab (3mm) | 5–8 | Heater qaij, xau |
| Cov roj hmab mos | Moulded PFA flange | Yog (tib yam) | PTFE (2 hli) | 8–12 | Creep, dab dej |
| Cov roj hmab tawv (ebonite) | Moulded PFA flange | Tsis yog (flange ib leeg) | PTFE (1 hli) | 8–10 | Cracking yog tshaj -torqued |
| Cov roj hmab tawv | Compression haum | Tsis yog (siv backing washer) | Roj hmab (2mm) | 6–8 | Txais tau |
| Txhua yam roj hmab | Los ntawm - tank (flanged ob sab) | Yog, ob tog | PTFE | 10–12 | Zoo tshaj tab sis complex |
Backing Plate Design for Mos Rubber
Rau cov khoom siv roj hmab muag (Shore A<70), a backing plate is mandatory. The plate distributes the clamping force, preventing the heater from sinking into the rubber.
Specifications:
Khoom sivStainless hlau 316 (los yog PP / PVDF rau chemical compatibility, tab sis hlau muaj zog dua)
Thickness: min 5 mm (rau 50 mm flange), 8 mm rau flanges loj
Txoj kab uas hla2.5-3 × lub flange sab nraud txoj kab uas hla (piv txwv li, flange OD 80 mm → phaj OD 200-240 mm)
Nto: Smooth, nrog lub hauv paus qhov rau lub rhaub dej (2-3 mm clearance)
Kev teeb tsa: Phaj zaum ntawm flange thiab roj hmab hauv ob sab phlu. Siv PTFE nyias los yog roj hmab gasket (2 hli) nruab nrab ntawm phaj thiab roj hmab kom tsis txhob kov cov hlau nrog lub hauv ob sab phlu (yog tias xav tau). Torque bolts sib npaug.
Field Piv txwv 1: Cov Roj Hmab Tsis Zoo
Cov nroj tsuag tshuaj tau teeb tsa lub tshuab cua sov PFA (compression haum) ncaj qha mus rau 5 hli mos EPDM hauv ob sab phlu (Shore A 55). Tom qab 2 lub lis piam, lub rhaub tau tilted 10 mm thiab sealing gasket leaked. Cov nroj tsuag ntxiv ib lub phaj hlau stainless (220 hli txoj kab uas hla, 6 hli tuab) nyob rau hauv qhov haum. Cov xau tau nres, thiab lub tshuab cua sov tseem nyob rau qib 5+ xyoo.
Teb piv txwv 2: Cov Roj Hmab Txhaum Cai
Ib txoj kab plating siv cov roj hmab tawv tawv (ebonite, Shore D 25). Lub installer torqued PFA flange mus rau 25 N·m (tsis pom zoo 10 N·m). Cov roj hmab tawv tawg nyob rau hauv lub flange ntug, nthuav tawm lub tank hlau rau corrosive acid. Lub tank yuav tsum tau muab tso rau hauv lub tank ($ 5,000 tus nqi). Cov nroj tsuag siv torque wrenches nrog limiters (10 N·m). Tsis muaj kev tawg ntxiv lawm.
Installation txheej txheem rau roj hmab -Lined Tanks
Tshawb xyuas cov roj hmab hauv ob sab phlurau cov kab nrib pleb, hlwv, lossis cov pob muag muag. Kho ua ntej tso cua sov.
Rau cov roj hmab muag muag: Muab cov phaj rov qab rau hauv ob sab phlu, kos lub qhov ntsia hlau, ua ntej- xyaum los ntawm cov roj hmab (siv cov laum ntse, qis ceev). Tsis txhob rhuav cov roj hmab.
Rau cov roj hmab tawv: Siv cov roj hmab los yog PTFE gasket (3-5 mm tuab) nyob rau hauv lub flange kom faib kev ntxhov siab thiab tiv thaiv kev tawg.
Siv torque wrench: Tighten bolts nyob rau hauv lub hnub qub qauv. Tsis txhob siv qhov cuam tshuam wrench.
Tshawb xyuas qib: Tom qab zawm, xyuas kom lub rhaub yog ntsug. Kho yog xav tau.
Saib xyuas
After installation, check the heater alignment monthly for the first 3 months. Any tilt >5 mm qhia txog roj hmab creep. Ntxiv kev txhawb nqa ntxiv lossis rov qab -torque (yog tias roj hmab tau kho). Re- xyuas torque txhua 6 lub hlis rau cov roj hmab muag; txhua 2 xyoos rau cov roj hmab tawv.
Xaus: Cov Roj Hmab Mos Yuav Tsum Tau Rov Qab Phaj; Cov Roj Hmab Nyuaj Xav Tau Ceev Torque
Xaiv qhov raug PFA lub rhaub mounting rau roj hmab -lined tank nyob ntawm cov roj hmab hardness. Rau cov roj hmab muag (Shore A<70, e.g., NR, EPDM), a stainless steel backing plate (5+ mm thick, 2.5–3× flange diameter) is required to distribute load and prevent creep sinking. For hard rubber (ebonite, Shore A >70), lub phaj nraub qaum yog xaiv tau, tab sis torque yuav tsum txwv (8-10 N·m rau M8) kom tsis txhob tawg lub nkig. Tsis txhob zawm ncaj qha rau ntawm cov roj hmab muag tsis muaj lub phaj. Tsis txhob dhau - nruj rau cov roj hmab tawv. Roj hmab tsis yog hlau; nws compresses, creeps, los yog tawg. Ua raws li lub hauv paus, tsim lub mount, thiab lub rhaub yuav nyob twj ywm. Lub tank hauv ob sab phlu tiv thaiv cov hlau; koj mounting tiv thaiv lub hauv ob sab phlu. Ua qhov yog.
