管路阻力计算英文版.doc

DNS515-401-017JS 300000 DWTCRUDE OIL TANKER300000 吨原油船 详细设计 DETAIL DESIGN DNS515-401-017JS 文件号 FILE 版本 REV. CALCULATION OF PRESSURE DROP ACROSSC.W. AND L.O. PIPES冷却水及滑油管路阻力计算书 重量 MASS 比例 SCALE 设绘 Designed 张云安 1999,3 共 20页 TOTAL SHEETS 第 1 页 SHEET 校对 Checked 审核 Reviewed 大连造船新厂船研所 DNS SHIP DESIGN RESEARCH INST. 大连船舶设计研究所 DALIAN SHIP DESIGN RESEARCH INST. 标检 Standardized 审定 Approved  Calculation of pressure drop across L.O. pipes (refer to sketch No.1). Date of M/E Type: Sulzer 7RTA84T-D MCR: 38850 bhp x 76 r/min. L.O. (low pressure) inlet of M/E bearing request: Min. 2.5 (bar); Max. 3.5 (bar) L.O. (high pressure) inlet of M/E crosshead bearing request: Min. 10.0 (bar); Max. 12.0 (bar) Date of equipment and pipes to be assumed as follows: 1) M/E L.O. pump: 480 m3/h x 0.55 Mpa. (2 sets in total, 1 set as a stand –by) 2) M/E crosshead L.O. pump: 90m3/h X 0.9 Mpa (2 sets in total, 1 set as a stand-by) 3) M/E L.O. cooler: Pressure drop about 5 m WG. 4) The temp. control valve: Pressure drop about 5 m WG. 5) The L.O. auto.back flushing filter: Pressure drop about 6 m WG. He = 5 + 5 + 6 = 16 m WG. (Pressure drop about 16 m WG in total for across No. 3), 4) and 5) of above equipment 6) The high distance between the outlet of L.O. pump outlet and L.O. coolerinlet about H = 7 m. 7) Pipes: l1: It is the pipe between L.O. pump outlet and L.O. cooler inlet. length about 25 m. l2: It is the pipe between L.O. cooler outlet and L.O. auto. back flushing filter.inlet. length about 10 m. l3: It is the pipe between aut.back flushing filteroutlet and the branch of crosshead L.O. pump suction pipe. length about 10 m. l4: It is the pipe between the branch of crosshead L.O. pupm suction pipe and M/E inlet. length about 20 m. Resistance calculation of main pipe of M/E L.O. pipes. V = (m/s) = = 1.9 (m/s) Where: V: