Centrifugal pump introduced the performance curve

Pump performance parameters such as flow Q head H-axis power N speed Î· efficiency between the existence of a certain relationship. The relationship between the magnitude of their changes is represented by a curve, which is called the performance curve of the pump. Pump performance parameters between the mutual changes and mutual constraints: first of all the top speed of the pump as a prerequisite. Pump performance curve has three main curves: flow - lift curve, flow - power curve, flow - efficiency curve. A, flow - lift characteristic curve It is the basic performance of the centrifugal pump curve. Than the speed of less than 80 centrifugal pump has the characteristics of rising and falling (both in the middle convex, both sides of the bend), said the hump performance curve. Centrifugal pumps with speeds greater than 80 to 150 have flat performance curves. Centrifugal pumps with specific rotations above 150 have sharp drop performance curves. In general, when the flow is small, the lift is high, and as the flow increases, the lift gradually decreases. B, flow - power curve Shaft power is increased with the flow, when the flow Q = 0, the corresponding shaft power is not equal to zero, but a certain value (about about 60% of normal operation). This power is mainly consumed by mechanical losses. At this time the pump is full of water, if the long run, will lead to continuous temperature rise in the pump, the pump housing, bearings will be heated, may cause severe thermal deformation of the pump body, we call "stuffy head" at this time The maximum lift, when the valve is gradually opened, the flow will gradually increase, the shaft power is also slowly increasing. C, flow - efficiency curve Its curve like the shape of the hill, when the flow is zero, the efficiency is also equal to zero, with the flow rate increases, the efficiency also gradually increased, but increased to a certain value after the efficiency of decline, the efficiency of a Highest value, near the highest efficiency point, the efficiency is relatively high, this area is called the high efficiency area.

Lap Joint Stub End

STUB END Type welded/seamless LONG TYPE /SHORT TYPE

Standard: ASME/ANSI B16.9 ANSI/ASME B16.11 ANSI/ASME B16.28

BSEN10253-2 BS EN10253-4

Size:1/2''~48''(Seamless); 16''~80''(Welded)

Wall thickness: Sch5~Sch160\XXS

Manufacturing process: Hot Extruded , cold extruded ,pressed , etc.

Material:

Carbon steel:

FSGP PG370W PT370
.ASTM / ASME A234: WPB - WPC - WP1WP11 - WP12 - WP5 - WP22 - - WP91
ASTM / ASME A/SA 420: WPL6 - WPL3EN 10216-2: P195GH - P235GH - P265GH-P355Nh
20MnNb6 - 16Mo3 - 8MoB5-4 - 14MoV6310CrMo5-5 - 13CrMo4-5 - 10CrMo9-10-15NiCuMoNb5-6-4 - X11CrMo5X11CrMo9-1 - X10CrMoVNb9-1X10CrWMoVNb9-2 - X20CrMoV11-1former BS-DIN-AFNOR equivalent grades)

HIGH YIELD STEEL FOR PIPELINE AND OFFSHORE FITTINGS
ASTM A860 / MSS-SP75: WPHY 42WPHY 46 - WPHY 52 - WPHY 60-WPHY 65 - WPHY 70 grades
WPHY 80 only as per MSS-SP75 EN 10208-2: L245NB - L290NBL360NB - L415NB - L360QBL415QB - L450QB - L485QB - L555Q

Stainless steel:

304/SUS304/UNS S30400/1.4301

304L/UNS S30403/1.4306;

304H/UNS S30409/1.4948;

309S/UNS S30908/1.4833

309H/UNS S30909;

310S/UNS S31008/1.4845;

310H/UNS S31009;

316/UNS S31600/1.4401;

316Ti/UNS S31635/1.4571;

316H/UNS S31609/1.4436;

316L/UNS S31603/1.4404;

316LN/UNS S31653;

317/UNS S31700;

317L/UNS S31703/1.4438;

321/UNS S32100/1.4541;

321H/UNS S32109;

347/UNS S34700/1.4550;

347H/UNS S34709/1.4912;

348/UNS S34800;

Alloy steel:

ASTM A234 WP5/WP9/WP11/WP12/WP22/WP91;

ASTM A860 WPHY42/WPHY52/WPHY60/WPHY65;

ASTM A420 WPL3/WPL6/WPL9;

Duplex steel

ASTM A182 F51/S31803/1.4462;

ASTM A182 F53/S2507/S32750/1.4401;

ASTM A182 F55/S32760/1.4501/Zeron 100;

2205/F60/S32205;

ASTM A182 F44/S31254/254SMO/1.4547;

17-4PH/S17400/1.4542/SUS630/AISI630;

F904L/NO8904/1.4539;

725LN/310MoLN/S31050/1.4466

253MA/S30815/1.4835;

Nickel alloy steel:

Alloy 200/Nickel 200/NO2200/2.4066/ASTM B366 WPN;

Alloy 201/Nickel 201/NO2201/2.4068/ASTM B366 WPNL;

Alloy 400/Monel 400/NO4400/NS111/2.4360/ASTM B366 WPNC;

Alloy K-500/Monel K-500/NO5500/2.475;

Alloy 600/Inconel 600/NO6600/NS333/2.4816;

Alloy 601/Inconel 601/NO6001/2.4851;

Alloy 625/Inconel 625/NO6625/NS336/2.4856;

Alloy 718/Inconel 718/NO7718/GH169/GH4169/2.4668;

Alloy 800/Incoloy 800/NO8800/1.4876;

Alloy 800H/Incoloy 800H/NO8810/1.4958;

Alloy 800HT/Incoloy 800HT/NO8811/1.4959;

Alloy 825/Incoloy 825/NO8825/2.4858/NS142;

Alloy 925/Incoloy 925/NO9925;

Hastelloy C/Alloy C/NO6003/2.4869/NS333;

Alloy C-276/Hastelloy C-276/N10276/2.4819;

Alloy C-4/Hastelloy C-4/NO6455/NS335/2.4610;

Alloy C-22/Hastelloy C-22/NO6022/2.4602;

Alloy C-2000/Hastelloy C-2000/NO6200/2.4675;

Alloy B/Hastelloy B/NS321/N10001;

Alloy B-2/Hastelloy B-2/N10665/NS322/2.4617;

Alloy B-3/Hastelloy B-3/N10675/2.4600;

Alloy X/Hastelloy X/NO6002/2.4665;

Alloy G-30/Hastelloy G-30/NO6030/2.4603;

Alloy X-750/Inconel X-750/NO7750/GH145/2.4669;

Alloy 20/Carpenter 20Cb3/NO8020/NS312/2.4660;

Alloy 31/NO8031/1.4562;

Alloy 901/NO9901/1.4898;

Incoloy 25-6Mo/NO8926/1.4529/Incoloy 926/Alloy 926;

Inconel 783/UNS R30783;

NAS 254NM/NO8367;

Monel 30C

Nimonic 80A/Nickel Alloy 80a/UNS N07080/NA20/2.4631/2.4952

Nimonic 263/NO7263

Nimonic 90/UNS NO7090;

Incoloy 907/GH907;

Nitronic 60/Alloy 218/UNS S21800

These fittings are used in lines that might require a quick-disconnect system. They are also used to

facilitate lining up the bolt holes of flanges when there flanges are now welded or fastened to the pipe.

Normally, stub ends are installed in pairs, the paired fittings mating with two lap joint flanges. This allows wasy opening of the line for future cleaning and inspection and if the line requires replacement, the flanges can be reused because they are not fastened to the system. They ride freely in the outside of the pipe. Lap joint stub ends are made with serrated Gasket surfaces for improved sealing of the connection and prevention of leakage at the joint. This surface has replaced the raised gasket surface of a flange.

Lap Joint Stub End,Stainless Steel Stub Ends,Long Hub Stainless Stub End,Astmb 16.9 Stub End

HeBei GuangHao Pipe Fittings Co .,LTD (Cangzhou Sailing Steel Pipe Co., Ltd) , https://www.guanghaofitting.com