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[Keywords] valve; quality requirements, procurement mode (1) lowest price winning mode. Whether it is a domestic construction unit or a foreign construction unit, they want to get the best products at the lowest cost, which causes the valve manufacturing unit to adopt the practice and strategy of winning the bid at a loss. However, in the process of valve bidding, the valve manufacturing unit adopts this “losing†bidding method, which mostly reduces the cost through “six-filled†to obtain profits. The cost of doing so causes the loss of corporate integrity, and often It became "a hammer sale." Many valve manufacturing units feel very wronged and often complain about the irrationality of the "rules of the game." Under such a model, such low prices and even product costs are not enough. It is impossible to obtain the kind of quality required in the bidding documents. product. For this kind of statement, this kind of complaint can be understood, can be sympathetic, but can not fully agree. At present, the key valves in many key parts of petrochemical plants and coal chemical plants in China are ordinary valves, but they tend to adopt imported valves. Moreover, this tendency is “upward†and “expandedâ€, which cannot be said. It is a kind of sorrow for the domestic valve manufacturing unit, and it is bound to force some valve manufacturing units to "dead road." In fact, this is not the result of the "self-killing" of domestic enterprises? Of course, from another perspective, the principle of the survival of the fittest, the unchanging principle, will surely make other valve manufacturing units that can keep their integrity and quality.
(2) Discussion on the bidding mode of “quality by priceâ€. For the procurement strategy of the valve “quality by price†mode, usually a small amount of prepayment is prepaid, and the service is evaluated according to the service life and quality of the valve. The final payment is paid according to the assessment result, and the final payment accounts for 50% of the total order price. More than %, this model is suitable for the valve manufacturing unit with strong financial strength. For most small and medium-sized valve manufacturing units in China, this model seriously affects the safety of capital return rate and capital chain, and it is also unacceptable. One of the main reasons.
(3) "Frame procurement" mode. The “frame procurement†model may be the most desirable way for all valve manufacturers, but this procurement model is hardly used by the construction unit for the simple reason that most valves required for industrial installations are not “high, fine, For the "tip" type, only the key parts of some devices require "high, fine, sharp" valves, and the number is limited, so the construction unit generally does not use the "frame procurement" model for procurement.
Second, the valve quality requirements Regardless of which procurement model is adopted, the construction unit and the valve manufacturing unit have a common desire, that is, "maximizing profits." As a construction unit, we always hope to get the most suitable products at the lowest cost, which is the most cost-effective product. During the tendering process, all valves are subject to component requirements, structural specifications, quality inspection requirements and transportation requirements. These requirements are sometimes high and seem to be very demanding.
(1) The problem of not allowing repair welding is not impossible for the construction unit, but the cost is too high. The film is qualified at the second level, but it is sampled according to the regulations. Therefore, under the drive of interests, the construction unit often Be lucky, or simply falsify.
(2) Unreasonable classification of procurement packages Some procurement units have different types of procurement packages, regardless of the type of valve, regardless of the size, regardless of the material, all into one package, but not allowed to subcontract, which leads to only a few Manufacturers can do it, and with the increasing size of the devices, the procurement schedule is very tight, which has brought the market to “brandingâ€.
(3) Problems that cannot be inspected and tested by technical requirements For example, whether the source of raw materials is scrap steel or mineral sand does not differ in the component inspection. However, the difference in mechanical properties is very large, and it is impossible to take the finished product for destructive performance test. There is no standard specification that requires destructive performance testing of the product; for example, the individual requirements for valve delivery are normalized and quenched. , annealing, etc., as well as the need for solution treatment, stabilization treatment, etc., then whether the required heat treatment, heat treatment is carried out in accordance with the standard specifications and other issues can not be detected on the spot. The unit to be constructed will transport the purchased products to the warehouse, and then submit them from the warehouse. After being transported to the site for installation and use, they will find a series of problems caused by not performing heat treatment or heat treatment. Such problems have appeared more and more, and the contradiction between the construction unit and the valve manufacturing unit has also intensified, and the final result is both losses.
(4) The problem of not knowing the actual working conditions is many in the petrochemical plant and the coal chemical plant. The valve manufacturing unit often adopts the attitude of “changing and changingâ€. However, once there is a problem, the manufacturing unit can't get rid of it. For example, valves under hydrogen conditions have requirements for anti-HIC steel. Forged valves have forging ratio requirements and heat treatment requirements. Gate valves, globe valves, and ball valves are also used. The same materials are used, but manufacturing requirements and usage requirements are Ordinary valves are actually different. Another example is the oxygen valve. Even if the material used is 304, it has very different requirements from the general 304 material pipes and valves, and this requirement cannot be ignored. This is one of the reasons why many valve manufacturing units that do not have petrochemical supply performance are difficult to enter the coal chemical industry. The problem of poor quality control is that some valves are found to be delayed before the installation to the site, and others are not found during the installation. Only during the production and use phase, the problem is discovered, which not only seriously affects the continuous production. Operation, which brings hidden dangers to production safety, must cause sufficient attention of construction units and valve manufacturing units.
When the valve is purchased, the buyer shall submit detailed technical requirements for the environment and the valve. The supplier shall carefully check the valve parts in the main parts of the valve production according to the requirements of the purchaser and make the valve products satisfactory to the user. The demander shall strictly control the quality of the supplier's valves in accordance with the procurement technical conditions, and communicate with the supplier in the main part of the procurement in order to obtain reliable and stable valve products to meet the requirements for use.
References [1] Zhuo Xiaowei. Positioning and Evaluation Method of Valve Internal Thread Detection [J]. Tool Technology, 2014, 44 (07): 19.
Discussion on improving the quality path of mechanical valve procurement management
ã€Abstract】 Valve procurement has to go through many links, but the key link to ensure quality is mainly the purchasing department's procurement technical requirements, which is an important link. With the construction of domestic engineering projects, the valve manufacturing unit will also develop and expand through unremitting efforts. There will still be many problems and contradictions between the construction unit and the manufacturing unit. It is urgent to study and work together to solve problems and contradictions. Go together.