Conmat Oil & Gas Pvt. Ltd.
Services  >

In-Service Welding

In-Service Welding is specialized welding on a piping system that is flowing and/or under pressure. With a team of Hot Tapping & welding expertise having over 15 years of field experience, we provide expert materials joining services, contract research, consulting services and training to Oil And Gas sector, Energy and Chemical, Steel Plant, Heavy Manufacturing & many more.

Our Standard Welding Package :

Thermal Analysis model program
Welding Procedure Specifications (WPS) per API 1104 Appendix B, ASME Sec. IX, AS 2885.2 - 2007
Complete Non-Destructive Examination (NDE) procedure
Quality Assurance Plan
Comprehensive equipment and tooling package with state-of-the-art pre-heating and monitoring
Trained welders qualified according to API 1104, ASME IX recommendations
We develop special Weld Procedure to avoid the need for Post Weld Heat Treatment (PWHT) especially arises per the wall thickness restrictions of ASME B 31.3 code, including Finite Element Analysis (FEA) and Engineering Critical Assessment (ECA) if required
Thermal Analysis
  Sample Copy
Welding Service Thermal Analysis  
Heat Input kJ/in Max. Cooling Rate
F/sec at 1000° F
Max. Cooling Time
t(800-500° ), sec
Max. Cooling
Temp. F©
HAZ Hardness Hv
1 17.0 169.1 1.47 775   (412) 293.69
2 18.0 152.5 1.61 792   (422) 282.62
3 20.0 124.8 1.90 849   (454) 253.02
4 22.0 102.5 2.23 881   (471) 246.90
5 24.0 84.3 2.57 900   (482) 233.65
6 26.0 74.1 2.95 892   (477) 222.76
7 30.0 59.2 3.74 925   (496) 205.48
8 35.0 48.2 4.84 952   (516) 192.32
   Speciality Services
Hot Tap Services
Line Stop Services
In-Service Welding
Pipeline Repair and Rehab Services
Hydrocarbon Recovery & Tank Management Services
Mechanical Services
Well De-waxing Services
   Engineering &    Consultancy
Engineering & Consultancy Services
Operator Qualification Program
Customer Training
PMI Services
The most critical variable for determining the crack susceptibility during and after welding is the chemistry of the material.  The percentages of Carbon  (C), Manganese (Mn), Chromium (Cr), Molybdenum (Mo), Vanadium (V), Nickel (Ni), and Copper (Cu) are used to calculate the Carbon Equivalent (CE), value of a material.

It is considered to be best practice to determine the actual CE value of a pipeline to confirm the applicability of existing welding procedures or to develop new welding procedures. We provide  PMI services (at site) for the pipeline where Carbon Equivalent not available, we use portable spectrograph  equipment and / or metal shaving equipment to analyse the CE value of a pipe.