Corrosion of ship distance piece (Scrubber system)

Currently, several reports for incidents that sea water leakage was detected from distance piece attached to hull on SOx scrubber discharge water line. Until now, the leakages were detected at an early stage and did not cause heavy water ingress into E/R. Upon the above incidents, we would like to recommend the owners and the managers as follows: To inform the above incidents of the masters of your vessels on which SOx scrubber is installedand instruct them to inspect the discharge water lines especially around the distance piecesexternally from E/R with more attentions and frequencies. To inspect the distance pieces … Continue reading Corrosion of ship distance piece (Scrubber system)

Pump Static Head Difference

Continue from Pump Total Differential Head The static head difference across the pump is the difference in head between the discharge static head and the suction static head. Static head difference = discharge static head – suction static head Discharge Static Head The discharge static head is sum of the gas pressure at the surface of the liquid in the discharge vessel (expressed as head rather than pressure) and the difference in elevation between the outlet of the discharge pipe, and the center line of the pump. Discharge static head = Discharge vessel gas pressure head + elevation of discharge … Continue reading Pump Static Head Difference

Pump Total Differential Head

Pump System Diagram Flow Rate Usually, the flow rate of liquid a pump needs to deliver is determined by the process in which the pump is installed. This ultimately is defined by the mass and energy balance of the process. For instance the required flow rate of a pump feeding oil into a refinery distillation column will be determined by how much product the column is required to produce. Another example is the flow rate of a cooling water pump circulating water through a heat exchanger is defined by the amount of heat transfer required. Total Differential Head The total … Continue reading Pump Total Differential Head

Flange Face Finish Type

What’s the flange facing finish? The facing finish or face finish of a pipe flange manufactured in accordance with ASME B16.5 refers to the smoothness or roughness of the facing surface. In a bolted flange joint, the flange face is in direct contact with the gasket. As the bolting is tightened, the softer gasket material flows into the minor machining imperfections of the flange facing, resulting in a fluid-tight seal. If the flange facing is smooth, a smaller tightening stress exerted on the bolting may result in an impervious seal. If the flange has a rough face, the smaller stress … Continue reading Flange Face Finish Type

ASME B16.5 para. 6.4.6 Flange imperfections

ASME B16.5 Section 6.4.6 addresses acceptable flange facing surface finish imperfections. The requirements are:“Imperfections in the flange facing finish shall not exceed the dimensions shown in Table 3 (Table II‐3 of Mandatory Appendix II). A distance of at least four times the maximum radial projection shall separate adjacent imperfections. A radial projection shall be measured by the difference between an outer radius and inner radius encompassing the imperfection where the radii are struck from the centerline of the bore. Imperfections less than half the depth of the serrations shall not be considered cause for rejection. Protrusions above the serrations are … Continue reading ASME B16.5 para. 6.4.6 Flange imperfections

Weld beveling for flange and fitting

Butt weld fittings is one of the most popular connection type in pipeline systems. It always been required in large quantities in different industries, and especially for the large diameter pipelines. What is Butt Weld FittingsButt weld is to connect pipes or fittings ends by welding. It’s a weldable steel pipe fitting that would allow to branch off, allow for change of direction of flow, attach auxiliary equipment, or reduce the size of the pipe. We aware the beveling is very important processes in the whole production procession of butt-welding pipe fittings, we always make beveling according to the standard … Continue reading Weld beveling for flange and fitting