PWHT on spherical Tank
Post Weld Heat Treatment ( PWHT) reduces the residual stresses formed during welding. It also restores the macro structure of the steel. Mandatory in high pressure applications, constructors have to strictly follow PWHT requirements to avoid component failures. This process is technically done by famous company because its costly and sensitive projects. our experiences in PWHT on spherical vessels betrayed that this company is one of the best in the world.
PWHT ON SPHERICAL TANK (Vessel)
Our experiences in PWHT on spherical tank
| Project Name | Location | OWNER | Inspector | Dia (meter) | Thk (mm) | Qty |
| AL-Romadi | AL-Romadi | Gas filling Company | A.G.I | 18.1 | 56 | 1 |
| Salmanfarsi Petrochemical complex | Maahshahr - Iran | SFPC | SFPC | 15.5 - 23 | 65 - 84 | 6 |
| Golgohar Iron Mine | Sirjan - Iran | Golgohar Iron mine | Moshiraan | 12.4 | 55 | 2 |
| Mosul - Iraq | Mosul-Iraq | Gas filling Company | A.G.I | 18.1 | 56 | 3 |
| Kavian Paetrochemical | Assaluye - IRAN | K.P.C | K.P.C | 26.1 | 56 | 1 |
| Basrah - SP700 | Basrah - IRAQ | Gas Filling Company | A.G.I | 18.1 | 55 | 1 |
| Khomeyn Petrochemical | Khomeyn | Arya petro | S.G.S | 21 | 48 | 2 |
| Dar es salaam - T-101A | Dar es salaam - Tanzania | MANJIS GAS Supply Co | INDIAN REGISTER OF SHIPPING (IRS) | 21.3 | 42 | 1 |
| Zarand Iranian Steel Co | Zarand - Kerman | ZISCO | ZISCO | 10 | 37 | 7 |
| Abu Ghraib - SP100A | Abu Ghraib | Gas Filling Company | A.G.I | 18.6 | 46 | 1 |
| Karbala - T-101B | Karbala - IRAQ | Gas filling Company | Heavy Engineering Equipment | 17.9 | 46 | 1 |
| Kianly - gas refinary | Kianly - Turkmenistan | TG (Turkmenistan Gas) | Hyundai | 16 | 45 | 3 |
| Nasiryah Gas Refinery | Nasiryah-IRAQ | Gas filling Company | A.G.I | 18 | 55 | 1 |
| KUT Gas Refinery | KUT-IRAQ | Gas filling Company | A.G.I | 18 | 55 | 1 |
| Diwaniah Gas refinery | Diwaniah-IRAQ | Gas filling Company | A.G.I | 18 | 55 | 1 |
| Latifiyah Gas refinery | Latifiyah-IRAQ | Gas filling Company | A.G.I | 18 | 55 | 2 |
| Hilla Gas refinary | Hilla-IRAQ | Gas filling Company | A.G.I | 18 | 55 | 1 |
| Rassafe Gas refinary | Rassafe-IRAQ | Gas filling Company | A.G.I | 18 | 55 | 1 |
| TAJI Gas refinery | TAJI-IRAQ | Gas filling Company | A.G.I | 18 | 55 | 1 |
| ASPC Petrochemical Complex | Assaluye | Aryasasol | Yekanpoolad | 26 | 55 | 1 |
| Arak Petrochemical Complex | Arak | N.P.C | N.P.C | 18 | 55 | 2 |
| Boccgo Gas Refinery | Boccgo - Indonesia | Pertamina | WINTECO | 18 | 46 | 2 |
| Cheligan Gas Refinery | Chiligan - Indonesia | Pertamina | WINTECO | 21 | 55 | 1 |
| Esfaham Refinery | Isfahan | N.I.O.C | WINTECO | 20 | 25 | 6 |
| Arak Refinary | Arak | N.I.O.C | WINTECO | 19 | 45 | 9 |
| Lavan Gas Refinery | Lavan Island | N.I.O.C | WINTECO | 23 | 54 | 1 |
| Bandar imam Petrochemical Complex | Bandar imam | N.P.C | Technip & D.E.C | 14.5 | 38 | 2 |
| Kiyanly Gas Refinary | Kiyanly - Turkmenistan | ParsEnergy | ParsEnergy | 16 | 50 | 3 |
| 10th OLEFIN PLANT MECHANICAL ERECTION | Assaluyeh | P.O.G.C | NARGAN - S.G.S | 5.6 ~ 7 | 16 | 2 |
| Lavan Gas Refinery | Lavan | N.I.O.C | N.P.C | 21 | 55 | 2 |
| IranJapan Petrochemical Complex | Mahshahr | P.O.G.C | P.O.G.C | 14.5 | 26-29 | 1 |
| ILAM Gas Refinery | ILAM | N.I.G.C | M.P.C | 25 | 50 | 4 |
| Arvand Petrochemical Complex | Mahshahr | P.O.G.C | P.O.G.C | 22 | 45 | 2 |
| Arak Petrochemical Complex | Arak | Arak Petrochemical | N.P.C | 10 | 35 | 2 |
| Amirkabir Petrochemical Complex | Mahshahr | N.P.C | N.P.C | 21 | 56 | 5 |
| N.I.O.C | Lavan | N.I.O.C | S.G.S | 22.5 | 42 | 1 |
| Aryasasool Petrochemical | Assaluyeh | Aryasasool Petrochemical | S.G.S | 13.2 - 17.9 | 46.5 - 50.4 | 2 |
| Tabriz Petrochemical Complex | Tabriz | N.P.C | N.P.C M.C | 16 | 41-498 | 4 |
| Aryasasool Petrochemical | Assaluyeh | Aryasasool Petrochemical | Nazeran Yekta | 14.5 | 25-35 | 1 |
| Rejal Petrochemical Complex | Mahshahr | Rejal Co | Nazeran Yekta | 20 | 74.48 | 3 |
| Tehran Refinery | Tehran | N.I.O.C | N.I.O.C | 16 | 25 | 1 |
| Borzoyeh Petrochemical Complex | Assaluyeh | N.P.C | Nazeran Yekta | 18.7 | 58 | 1 |
| Abadan Refinery | Abadan | N.I.O.C | N.I.O.C | 12 | 40 | 1 |
| Bandar imam Petrochemical Complex | Bandar imam | N.P.C | N.P.C | 18.5 | 50 | 2 |
| Bandar imam Petrochemical Complex | Bandar imam | N.P.C | N.P.C | 18 - 16 - 14 | 45 | 3 |
| Sarkhon 2 Refinery | Sarkhon | N.I.G.C | N.I.G.C | 16 | 40 | 4 |