Author: Amarine Antonio

Shipbuilding and welding professional.
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Certification Mark UV, U, V stamp (ASME VIII)

Amarine Antonio

Certification Mark of Section VIII PRV (UV Stamp); The Pressure Relief Valve (PRV) designed according to ASME Section VIII regulations will be stamped with the symbol “UV “. Required Marks on Nameplate of ASME Section VIII Vessels;  Marking on the Nameplate of ASME Section VIII (“U” Stamp) Pressure Vessels must have at least Vessel information as in the picture below: Certification Mark of ASME Section VIII Vessel (U Stamp); Pressure Vessels designed and built according to ASME Section VIII regulations must be stamped with the symbol ” U “. Certification Mark of ASME Section I PRV (“V” Stamp);  Pressure Relief Valve (PRV) designed in accordance with ASME Section I (Power boiler) requirements. Power Boiler must be stamped … Continue reading Certification Mark UV, U, V stamp (ASME VIII)

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What is Rupture Disc?

Amarine Antonio

Rupture Disk;  Rupture Disk is a pressure relief device that does not close. (Nonreclosing) by releasing the pressure when the Disk breaks ( Burst) at Burst Pressure Rupture Disk is often used together with Pressure Relief Valve (PRV) to prevent corrosion from the process fluid touching PRV. Rupture Disk – Installation;  The Rupture disk installation is directly between the Rupture disk and the PRV. There must be a Vent Pipe or Pressure Gauge to check if the Disk is leaking or cracking. When we remove the disk for inspection or maintenance, the PRV should replace the disk because the Disk … Continue reading What is Rupture Disc?

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What is Field Metallographic Replica?

Amarine Antonio

Field Metallographic Replication (Replica) 1;  Field Metallographic Replication, or Replica, is the peeling of a workpiece and used in an endoscope. Microstructure To indicate features and changes Metallurgy (Metallurgy) of the workpiece. Field Metallographic Replication (Replica) 2; How do Field Metallographic Replication (Replica)  Continue reading What is Field Metallographic Replica?

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What is MAWP of pressure vessel (ASME VIII)

Amarine Antonio

MAWP of Vessel per ASME VIII;  Maximum Allowable Working Pressure (MAWP) of the Pressure vessel is a Maximum Pressure of Vessel part at least, a strong will can be obtained by measuring the Pressure at the Top of the Vessel  MAWP of Vessel per ASME VIII – Example;  For example, the Maximum Allowable Working Pressure (MAWP) of the Vessel in Strength Calculation Sheet. Further discussion on MAWP and Design Pressure: Design Pressure Vs MAWP (API, ASME) Continue reading What is MAWP of pressure vessel (ASME VIII)

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Pressure Vessel Full Vacuum condition

Amarine Antonio

Full Vacuum Condition (FV) per ASME VIII;  The design pressure of the pressure vessel in accordance with ASME Section VIII that is specified as FV or Full Vacuum is the state in which the internal pressure vessel is vacuum (Absolute pressure = 0 kPa) and external pressure is equal to 100 kPa which is approximately the atmospheric pressure.   Continue reading Pressure Vessel Full Vacuum condition

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What is Built-up Backpressure of PRV?

Amarine Antonio

Continue on: What is Backpressure, Superimposed Backpressure? Built-up Backpressure of PRV;  Built-up back pressure is the pressure that will occur when the pressure relief valve (PRV) opens and the pressure is released. This is because there Head/friction loss (Pressure drop) in the pressure relief system: Example of PRV Backpressure;  Example of Backpressure Calculation of Pressure Relief Valves (PRV) in the system Continue reading What is Built-up Backpressure of PRV?

API 510, API 570 - PI, OIL & GAS, PIPING3 Comments

What is Backpressure, Superimposed Backpressure?

Amarine Antonio

Backpressure of PRV;  Backpressure is the pressure on the outlet side of the Pressure Relief Valve (PRV) which will affect the operation. Performance of PRV by Backpressure contains Superimposed backpressure and a Built an up backpressure: Superimposed Backpressure of PRV; Superimposed Backpressure is a static pressure on the outlet side of Pressure Relief Valve (PRV). There are both Constant and Variable. Continue reading What is Backpressure, Superimposed Backpressure?

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What is Balanced Bellow of PRV

Amarine Antonio

Balanced Bellow PRV;  Balanced Bellow Pressure Relief Valve is The Conventional PRV with Bellow for reducing the impact of Backpressure from the Outlet of PRV makes PRV can be turned off as the Set pressure setting. Refer to: What is Backpressure testing of PRV? Refer to: What is Cold Differential Test Pressure (CDTP) on Conventional vs Bellow PRV To use Balance bellow PRV, open a vent hole on the Bonnet to monitor the leak of the Bellow and to reduce the impact of Backpressure on Set pressure in case of Bellow leak: How Balanced Bellow Work; Balanced Bellow is able to eliminate the impact of the Backpressure because the pressure from the Backpressure is applied to both sides of the Bellow and is offset.   Continue reading What is Balanced Bellow of PRV

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What is Test Gag of Pressure Relief Valve

Amarine Antonio

Test Gag of Pressure Relief Valve;  Test Gag is a bolt used for the spindle block of the pressure relief valve (PRV) to allow the PRV to be closed during the pressure test. The bolt should be tightened when the system has 80% of the pressure used. test (test pressure) to ensure that the PRV is closed at the test Pressure: Continue reading What is Test Gag of Pressure Relief Valve