What is Caliper Pig – Pipeline inspection

Caliper Pig – Introduction; Caliper Pig is a device (Tool) used for monitoring the Pipeline, especially with the underground or under water (Subsea) by Caliper Pig is then inserted into the tube (In-line Inspection) and will be run by the compressed Flow of Fluid. Caliper Pig will have legs or Mechanical Arm to measure Inside Diameter of Pipe. Surrounding with an Odometer attached to the Caliper Pig to run inside of the pipe. Caliper Pig  or Geometry Pig can check dents (deformation)  and roundness (ovality) of the Pipeline throughout the length of the pipeline by Mechanical Arm measurements include the ability to show the location of Defect from the Odometer. Lets see examples of the results of the survey by Caliper Pig for Underground Pipeline. Caliper Pig is measured Inside Diameter of Pipe and display as 3D … Continue reading What is Caliper Pig – Pipeline inspection

Stainless steel welding notes

Most types of stainless steels have good weldability and can be welded with all arc welding processes (GMAW, FCAW, GTAW, SMAW and SAW).  Stainless is used in many different applications for its strength, abrasion resistance and corrosion  resistance.  Unfortunately, many assume it can be welded just like carbon steel. In fact, this is the first and worst mistake that can be made: assuming it will weld (and behave) like carbon steel. This post will not attempt to provide a crash course in welding stainless steels.  Instead, we want to focus on 5 of the most common mistakes made when welding … Continue reading Stainless steel welding notes

Hydrostatic test with Flange Joints (considering of Flange MAWP)

As a common hydrostatic test procedure, the test pressure will be taken from the piping system MAWP.  Depending on the primary code applied, the test pressure can be 1.5 MAWP, or 1.3 MAWP + factors, or 1.15 MAWP… etc., Refer to What is MAWP, What is Max operation pressure, Hydrostatic test: What is the MAWP of the pressure vessel (ASME VIII) FITTING PRESSURE RATING PIPE PRESSURE RATING PIPING HYDRO-STATIC TEST COMPREHENSION Test Pressure vs MAWP (ASME VIII) Design Pressure Vs MAWP (API, ASME) MAWP is normally referred to as system maximum allowance working pressure. The fitting is small and is … Continue reading Hydrostatic test with Flange Joints (considering of Flange MAWP)

Guide to flange raised face repaired by machining.

Take a look at the requirements of the height of raised face as per ASME B16.5: ASME B16.5 Flange – Regular Raised Face Height Typically, the height of Raised Face of ASME B16.5 Flange is divided by Flange Class by: 1- Flange Class 150 and 300 which have the Raised Face Height around 2mm. 2- Flange Class 400 and above have Raised Face Height around 7mm. When damage occurs on Flange’s Raised Face, the method to repair without welding works as per ASME PCC-2 can be done by machine, removing the damaged parts and refinishing the Raised Face again. Then do MT … Continue reading Guide to flange raised face repaired by machining.

Orifice Installation Matter in the piping system

Regarding What is Orifice and its application, please refer to FLOW METER AND ORIFICE PLATE Introduction of Erosion on Piping downstream around Orifice installation area: Typical erosion in piping systems often occurs on the flow with the exclusion of turbulence, for example. Where the flow direction changes (elbow, tee) or downstream of the orifice in the pipe system. In addition, Flow is a two-phase (with solid or liquid particles) and has a higher speed of erosion. In the Orifice installation area, the Flow Orifice (FO) is used to block the flow and reduce the pressure of Steam down to allow it to become condensate, but since Steam has passed from Orifice that cannot be fully condensed in this area, the turbulence of Flow will exist.     Continue reading Orifice Installation Matter in the piping system

ASME VIII MDMT and Impact test exemption

ASME Code Section VIII Div 1 exemption rules for ASME Impact Test Requirements: There are specific rules in the ASME Code for exemption from ASME Impact Test Requirement. This test is very expensive, so pressure vessel manufacturers are trying to be exempted from this costly test. You need to follow the following clauses to make exemption assessment for ASME impact test requirement: UG-20(f) →→ UCS-66(A) →→ UCS-66(b) →→→UCS-68(c) First, you have to keep your pressure vessel design data available and then refer to UG-20 (f). If you are exempted from this clause, you do not need to proceed further. But … Continue reading ASME VIII MDMT and Impact test exemption

Corrosion in Heat Exchanger

There are 4 main reasons that cause corrosion in heat exchangers to need to be concerned during the inspection: Water impingement, Temperature, Vibration, Velocity. Refer to: Typical location of Corrosion on Heat Exchanger Cooling Water Corrosion in Heat Exchanger Tubes at High Water Temperature Zone; Another important factor affecting Corrosion in Heat Exchanger Tube Service at Cooling Water is the temperature. The area where the Cooling Water has a high temperature ( on the Outlet side ), there will be more fouling and corrosion than the low-temperature area. In the example, you can see from the corrosion that occurred in front of … Continue reading Corrosion in Heat Exchanger

Thermal Expansion affections in Piping system

Linear Thermal Expansion of Pipping; One factor that must be considered in the design of the piping system is Piping Flexibility. Because our pipes will stretch itself when the temperature is increased, and shrink when the temperature is dropped. Therefore, our piping system must be flexible or able to move back and forth sufficiently to support elongation or shrinkage of pipe. In ASME B31.3 Process Piping Design determines the Linear Thermal Expansion of each material. To be used to calculate how much piping will stretch or shrink according to how much temperature has changed. The values ​​in Table C-2 measure … Continue reading Thermal Expansion affections in Piping system