ASME B16.5 has endorsed the design of Long Welding Neck Flange (LWN), which is also known as straight hub welding flange. The LWN Flange is constructed by two sections: the upper section is a heavy-wall barrel, whilst the lower section is a disc-like Plate Flange with all dimensions conforming to ASME B16.5 standard flanges.
Application
sales@ghsailingpipe.com
Size: 1/2''~24''
Class Rating: 150~2500
Facing: RF(raised face);FF(flat face);RTJ(ring type joint);RJ(ring joint face)
TG(tongue and groove face);MFM(male and female face)
Manufacturing process: Push, Press, Forge, Cast, etc.
Material:
Carbon steel:
ASTM A105;
ASTM A266 GR.1,GR.2,GR.3,GR.4
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 A694 F42/F46/F48/F50/F52/F56/F60/F65/F70;
ASTM A182 F5a/F5/F9/F11/F12/F22/F91;
ASTM A350 LF1/LF2/LF3;
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
LWN Flange LWN Flange,Lwn Forged Flange,ASME LWN Flange,Long Welding Neck Flange He Bei GuangHao Pipe Fittings Co .,LTD (Cangzhou Sailing Steel Pipe Co., Ltd) , https://www.guanghaofitting.com
The introduction of this policy immediately attracted widespread attention from chemical companies in Yunnan Province. Some companies expressed concern about the prospects of the entire low-level phosphate fertilizer industry after the implementation of this policy. They believe that many Chinese farmers are not rich and the market demand for low-concentration products is still very large, and “one size fits all†is not appropriate.
The head of sales of Yunnan Anning Xingya Phosphorus Chemical Co., Ltd. said that the company's products have been in short supply outside the province. Now that they are out of provincial railway transportation, they have to apologize to customers outside the province. At present, the company can only focus its sales on the province.
Li Yawei, general manager of Kunming Haikou and Weiwei Co., Ltd., told reporters that due to the fact that the amount of chemical fertilizers out of the province could not meet the needs of the company's development and that the price of raw materials has increased, the company has now stopped work for several days, and the workers have also taken vacations. rest. The next step may be to switch to other products.
According to statistics, at the end of 2007, there were a total of 105 superphosphate enterprises in Yunnan Province, among which there were 70 enterprises with an annual production capacity of 100,000 tons or less, and only 5 factories with an annual production capacity of over 200,000 tons. Therefore, these restrictive policies introduced by Yunnan Province target the vast majority of superphosphate enterprises.
Tao Shiqiu, chairman of Yunnan Jinxing Chemical Co., Ltd., a leading company in the low-level phosphate fertilizer industry in Yunnan Province, believes that high-concentration phosphate fertilizers in China currently account for 60% of the market share. Low-level phosphate fertilizer companies represented by superphosphate enterprises are feeling pressure. Great. The introduction of this policy is likely to have caused a fatal blow to the entire low-level phosphate fertilizer industry in Yunnan Province.
“China has a large population, many farmers are not rich, and low-concentration products are still in short supply in the market, so they should not blindly kill low-concentration phosphate fertilizers.†Tao Shiqiu said, “The government should support some powerful companies to become bigger and stronger. Resources, but also to meet the needs of farmers. From the business point of view, the full change to do high-concentration phosphate fertilizer is also not realistic. According to analysis, phosphate rock supply and rail transport is the development of low-level phosphate fertilizer industry in Yunnan Province two major support. At present, the company faces the situation that raw materials and transportation are both hindered. Superphosphate companies cannot be bigger and stronger at all.
Some experts also called for the low-level phosphate fertilizer name. They believe that "blindness from height" is not necessarily entirely reasonable. Fertilizers that meet the nutritional needs of the soil and crops are good. Practice has proved that the superphosphate, calcium, magnesium, and phosphate fertilizers contain sulphur, calcium, magnesium, silicon and other nutrients that cannot be replaced by most chemical fertilizers. The development of low-level phosphate fertilizers will help maintain diversity, differentiation, and nutrition in China's chemical fertilizers. Diversification of ingredients. At the same time, low-level phosphate fertilizers also have obvious advantages in terms of prices. It was also learned that while Yunnan Province introduced restrictive policies, Gansu and other places have introduced policies to accelerate the development of the superphosphate industry.
Yunnan Province Chemical Industry Association official said that from the perspective of resources, the environment, Yunnan Province, low-level phosphate fertilizer industry structural adjustment is inevitable. Therefore, companies should produce according to the requirements of resources, environment and benefits. Phosphorus chemical industry has a wide range of products, and there are many products. Restricted enterprises can improve their scientific and technological content and produce fine-phosphorus chemical products according to their own actual conditions. At the same time, they can change their direction through affiliation, foreign investment, and joint operations. Some companies have begun to take action in this area. For example, Zhao Fu, chairman of Yunnan Xinzhengda Phosphorous Chemical Co., Ltd., said that due to the extreme competition in the province of superphosphate products and the restrictions on shipping from the province, they are already The new equipment will produce products with higher added value, such as calcium phosphate, and will also focus on foreign markets. It is said that the company’s new products will be exported in March.
The long welding neck flange is mainly applied to the construction of pressure vessel functioning as a nozzle (such as a thermowell nozzle). To attach a common welding neck flange to a pressure vessel, a piece of pipe is required with additional welding. A LWN flange on the other hand attaches directly to the vessel, hence, it can be viewed as an integrally reinforced nozzle. It avoids making a weld seam at pipe to flange and provides self-reinforcement.
Businesses believe that: adjustments should not be "one size fits all"
Subject matter: Yunnan Province issued a series of policies on the adjustment of low-level phosphate fertilizers this year. Starting from January of this year, phosphorus ores needed for production of calcium superphosphate enterprises in Yunnan Province will no longer be subject to near-site supply and preferential price policies. From March 1st this year, companies with an annual production capacity of 100,000 tons and below are eligible. As a matter of principle, no railroad transportation plan will be arranged; before the end of 2010, we will phase out and close down single sets of devices with an annual production capacity of less than 200,000 tons. This newspaper reported on this issue on February 4th.