The necking hinders of the Company are made by hot press and retracting of seamless steel pipes at special hinder necking machine. In this way, the hinders will have thicker walls and cleaner surface. The necking cover will form membrane stress rather than bending stress with desired stress performance under the effect of inner pressure. Many boiler factories have made stress test and bursting test. The tests have reached the same conclusion: the stress in end cover wall under working pressure is far lower than permissible stress of the material. The bursting pressure is over 20 times the working pressure during cold blasting. Without end cover, necking hinders have welding seams, large strength margin, high hinder pressure as well as safe and reliable performance. As a result, necking hinders are very popular among the manufacturers and users.
The header is consisted of header body(large diameter seamless steel tube), end cover(enclosure), tube joint, hand hole, thermometer socket and so on. And the welding checking is strictly proceeded as the welding process to guarantee 100% qualified products.
The qualified welding, high automation degree, safe and reliable operation.
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