- #Sunrise pipenet review update
- #Sunrise pipenet review software
- #Sunrise pipenet review code
#Sunrise pipenet review code
The China code on piping stress anlysis clearly states: it's not necessary to satisfy the vendor's allowed values under OCC cases. Some reaction forces and moments of nodes connected to equipment nozzles are greater than the allowed values provided by the vendor. I don't know what other things should be considered? My question is, are these 3 snubbersenough for this system? I heard some other 1000MW-class fossil plant uses more than 20 snubbers in its main steam system per unit. I think my stress analysis process is finished. I gave our civil group the maximum reaction forces and moments of all restraints, and they said ok for the building. I used only 3 snubbers for the whole system and the conmbined OCC stresses are all passed. The main steam design parameter is 26.47MPa.g, 610degC, pipe material is A335P92. The earthquake can be ignored because it is below class 8 per China local code. I set up the Main Steam/High Pressure Bypass/Cold Reheat combined pipline in one ms._A model, and only considered steam hammer for the system. I still have another question here to ask everybody.
To provide the pressure control valve at he discharge of the fire water pump.Thank you, Loren Brown. To provide the restriction orifice plate at he discharge of the fire water pump. Size up of a portion of the fire main grids. To ensure fire water supply routes by adding the block valve in case of single fire main leg failure. Improvement of roughness of internal surface of the pipe (e/D) by pig-cleaning. Improvement Planning for the existing fire main system. If a pump is running at more than 150% load, then restriction orifice is inserted at the discharge line, and calculate again. To calculate operation load for each fire water pump when operated simultaneously. Study for parallel operation of the fire water pumps. single leg failure of the fire main case. 
Hydraulic calculations of the fire mains for fire water demand of each sectional area. prediction of C-value improvement after pig-cleaning. prediction of C-value depending on test data and roughness of internal surface of the pipe (e/D). To estimate C value of Hazen-Williams formula. To prepare overall fire main grids layout drawing including block valves by reviewing the existing document and site survey. The roughness (e/D) will be increased yearly and then C-value is decreased to increase the pressure loss.įPEC will do the review and improvement planing of the aged fire main grid system as an entrusted business.įollowings are example which FPEC had performed overall review of the aged fire mains. 
#Sunrise pipenet review software
Pressure loss is calculated by the network hydraulic calculation method by using PIPENET software (developed by Sunrise, adopted by Major Oil Companies), which program allows pump performance curve of multi pumps as inputs.įPEC estimated the relation between roughness of internal surface of the pipe (e/D) and C value of Hazen-Williams formula as shown below. Deterioration of the aged fire main grids → Pressure loss calculation and improvement planing.The lower head pumps may be running at no discharge.Water discharge load may be concentrated to a single pump, which has the highest differential head, and increased to more than 150% load beyond the capacity of the driver.Both vertical pumps and horizontal pumps are connected to the fire main grid, and running simultaneously, even if the rated heads are almost same.Multi pumps, which differential heads are quite different from each other, are running simultaneously to supply water to the fire main grids.Installation of additional fire pumps → confirmation of simultaneous running of multi fire pumps.Additional fire mains had not been reflected to whole fire main grid system.
Long time has been passed from the construction.
#Sunrise pipenet review update
Fire main drawings not updated → Update the fire main drawings. So it is strongly recommended to investigate, to review, and to improve the existing aged fire mains, since old fire main system may have various problems as described below. The aged fire mains is usually corroded and roughness of internal surface of the pipe becomes too big, resulting in big pressure drop. Now, fire main system including fire pumps shall be totally reviewed in accordance with newly established regulation in Japan, if the fire mains is aged longer than 39 years. In Japan, when mega earthquake occurred, we found several problems of the existing fire mains in refineries and chemical plants, such as water leakage from the underground fire mains, insufficient pressure for fire fighting, less coverage by hydrants caused from insufficient block valves, problems caused from simultaneous running of the various type of fire pumps etc.
0 kommentar(er)
