The rapid development of compact spinning technology

Since 1999, since the advent of compact spinning technology, has experienced nearly 10 years of application and continuous improvement has shown that dense spinning technology in the spinning quality, spinning efficiency, saving cotton, weaving efficiency, dyeing and processing and the environment Protection and other aspects of the advantages of compact spinning technology to show the momentum of rapid development, compact spinning technology has great potential for development. Many developed countries and regions have almost all of the tight ring spinning instead of the ordinary ring spinning, China's tight spinning has also accelerated the pace of development, not only spinning mills on the ordinary ring spinning machine for the production of tight ring spinning technology Close ring yarn, and there are some domestic textile machinery factory can produce a transformation of ordinary ring spinning for the tight ring spinning compact spinning parts, cheap parts for the supply of cotton spinning plant for the transformation of the ring, In addition, China can not only produce Suosen-type compact spinning parts, but also produce Toyota EST-type tight spinning parts supply market.
The DTG event is designed to be the trendsetter for the textile industry player to showcase new technology, state-of-the-art equipments, materials and services, as well as an excellent avenue for international suppliers and visitors to expand business to the lucrative market and accelerate Bangladeshi technological advances that will impart effective quality, high speed and competitive cost to gain that all important edge in textile & garments industry.

The development of centrifugal chemical pump

With the economic development, self-priming centrifugal chemical pump in the project has been more and more widely used, the following to help you detail the status of self-priming centrifugal pump and its development direction.
Self-priming centrifugal chemical pump because of its simple installation, small footprint, easy maintenance, no noise, etc., in the project is widely used in municipal engineering, factories, commercial, hospitals, hotels, residential areas and other sewage discharge. At present, China's domestic self-priming centrifugal pump is mainly produced and manufactured by domestic manufacturers, a small number of products imported from abroad. Market prospects are very broad. However, due to the reliability of the sewage pump to be strengthened, so to improve the technical content of its products is the main direction of future development of manufacturers.
Self - priming centrifugal chemical pump development direction
For the self-priming centrifugal pump problems, some domestic manufacturers to focus on the development of the pump protection system: the abnormal operation of the sewage pump abnormal alarm or cut off the power. Although this approach can be a certain effect, and this protection is necessary, but this is not the fundamental way to solve the problem, we should also focus on improving the performance of the pump, the problem is fundamentally resolved.
In addition, the product development should also take full account of environmental issues, so that R & D products are more energy efficient, environmentally friendly. In summary, the diving sewage pump in the future need to solve the problem is to improve the use of reliability, can adapt to a variety of working environment, optimize its structural design, and further improve the self-priming centrifugal chemical pump performance.

Permanent Solution for Emergency Restoration

Imagine standing in a swamp with knee-deep mud, rain pouring down and mosquitoes swarming on a hot muggy day in July. You are watching a 500-kV tower — destroyed by a tornado the night before — being hauled away so a temporary structure can be placed into the line and power can be restored. Now imagine it is three months later, the swamp still has knee-deep mud, mosquitoes are still swarming, and it is a bright and sunny humid day. The temporary structure installed in the 500-kV line is being dissembled and replaced with a permanent structure.
In an effort to avoid this scenario, Dominion’s transmission lines group has adopted a strategy of restoration called permanent emergency. For all emergencies, whether minor or major, the restoration practice from 69-kV to 500-kV lines is to use materials, towers and poles in inventory to replace or restore the damaged parts of the line with permanent replacements. Simply put, the motto for emergencies is to “do it once and walk away.”
The Dominion transmission system consists of 6500 miles (10,461 km) of 69-kV, 115-kV, 138-kV, 230-kV and 500-kV lines covering most of Virginia and eastern North Carolina, U.S. Dominion placed the first 500-kV line into service in 1966 and then expanded the system from that line to cover most of its service territory. Because of their age and the demand for more power, most of the original lines have been rebuilt or are in the process of being rebuilt. As of June 2016, more than 5000 500-kV towers make up Dominion’s 500-kV system and 85% of these towers are tangent towers. In terms of operations, there are five major families of towers: 5, 5V, 5-2, F and 93 series.
Structural Background
Developing a functional strategy requires looking at both the design and historical events on the system. Prior to 1999, Dominion did not experience many structural failures on the 500-kV system. These failures were addressed with two temporary, in-house-designed, multidimensional aluminum H-frame structures. These structures were used once or twice in the early 1970s and then set aside. Spare structures consisted of extra towers and parts ordered for a project. They were not inventoried and were dumped on a back lot.
In 1999, an articulated mowing machine knocked a guyed V-tower off its foundation, resulting in a slight buckling of the two legs. The structural engineering group designed a temporary direct-buried guyed H-frame structure composed of an old steel tubular tower. This was later replaced by a lattice self-supporting tower identified from surplus.
In 2001, another guyed tower — located on a mountainside in West Virginia — failed as a result of a broken guy grip, most likely during a wind event. This was ironic because guy grips on towers in the adjacent valley, locally known as Hurricane Alley, had been inspected the previous month to determine whether a guy grip replacement program was needed. Early the next morning, engineers took a helicopter to the remote site, arriving before any construction personnel. The tower had fallen in the transverse direction into the tree line. It was readily apparent the foundation and anchors were intact. If — and that was a big if — a replacement tower was available, the new tower could be erected on the same site.
The only available option was the temporary H-frame previously described. After blasting holes in the rock to direct bury the legs, setting the longitudinal guys and erecting the structure, the line was energized five days later. A permanent self-supporting tower was ordered and installed months later, requiring another seven-day outage. The total cost of the restoration was US$1.1 million, and the restoration required two outages and 12 days.
A meeting was held for management, construction and transmission operations to discuss lessons learned and what could be improved. It was noted the two recent incidents involved the same tower type with no damage to the foundations and anchors. Considering the number and age of this tower type, as well as the time it took to install the temporary structure, Dominion decided to order two spare guyed V-towers.

Blister Packaging Testing Methods

Introduction
Blister packaging or press through packaging (PTP) is a widely used packaging technique in the pharmaceuticals industry, especially for the mechanized packaging of solid medicines. It represents 30% of the worldwide market for pharmaceutical packaging. The following are the key benefits of blister packaging:
Allows medicine to be stored in stable and reliable condition
Facilitates minor amount and serial packaging
Provides convenient, portable, hygienic, and safe packaging
More versatile and allows for long-term storage
Features functions such as counter forgery and identification
Testing Specifications for Blister Packaging
Blister packaging is mainly used for solid drugs, preventing the drugs from exposure to microorganism, foreign matter, moisture, and air and avoiding the leakage, release, or evaporation of the APIs present in the drugs.

Material testing is essential due to the possibility of the direct contact of the drugs with blister packaging materials such as PVC/PVDC laminated sheets, PVC sheets, and PTP aluminum foil. The testing parameters include barrier property, appearance, hygiene indexes, and mechanical properties such as impact resistance strength, tensile strength, thermal tensile ratio and much more. This article discusses the testing of key characteristics of blister packages.
Barrier Property Testing
Barrier property testing includes testing of oxygen transmission rate and water vapor transmission rate. The testing procedure for oxygen transmission rate in aluminum foil packaging is not described in the standards. However, if the number of pinholes meets the specifications outlined in the standards, it can be taken as a measure of the oxygen transmission rate requirement for a specific packaging. High precision instruments must be used for testing due to the high barrier properties of PVC and aluminum.
It is not possible to test the entire blister package on the current whole package testing fixtures, due to the small sizes of the package. The values obtained from the film barrier property testing significantly differ from the actual water vapor transmission rate and oxygen transmission rate of the packaging materials due to force of the aluminum foil, thermal tensile ratios of the materials, and the uniformity of the adhesives.
For that reason, a specially designed fixture is used for blister sample preparation to test the whole blister’s barrier property (Figure 1). Testing of rates of water vapor transmission and oxygen transmission is performed using sensor method and equal pressure method, respectively. The flow velocity is carefully adjusted during the testing to prevent the impact on the sample status caused by the change in the gas quantity and the subsequent change in the pressure inside the blister.

How to select an air handling unit

Air handling units come in all shapes and sizes. Learn to balance and prioritize all of the choices related to performance, efficiency, maintainability, and space constraints.
Learning Objectives
1. Know the different types of ahu coils, and their basic anatomy
2. Understand the codes and standards that govern AHU specification
3. Learn about how energy can be saved in HVAC systems that use AHUs.
A basic definition of an air handling unit (AHU) might be “a box with a fan, coils, and filters.” From there it gets considerably more complicated. Proper selection of an air handler requires answering myriad questions ranging from “what capabilities are required?” to “will it fit?” Only after establishing these basic project constraints can the art of evaluating and selecting an AHU begin.
Before starting this process, it’s important to realize that there will not be a “perfect” selection for any AHU as many competing criteria, not the least being cost, will force compromises. It is the engineer’s job to balance and prioritize all of the decisions related to performance, efficiency, maintainability, and space constraints to select a unit that has the lowest lifecycle cost for a given application.
This article provides general information and guidance on the selection of various ahu heat exchanger components, starting with a brief description of the major categories of AHUs. While much of the discussion in the remainder of the article relates primarily to large AHUs, the general considerations can be applied to any size.