WXM long-term supply φ500 circular insulating hole, 74DD round manhole manufacturers - Changzhou St. Tang Pipe Manufacturing Co., Ltd.. 

 Manhole insulation, rectangular insulation Kong round thermal manhole, manhole, manhole prices, the standard of the manhole, manhole manufacturers, revolving flat Flat welding flange hole, rotary cover with carotid flat welding flange hole, rotary cover weld neck flange manhole, Contact: Wu Xiaomin: 13393272821 QQ: 280391881]. Hanging vertical cover plate welded flange holes, manholes, manhole prices, manholes market, manhole manufacturers. Rectangular manholes, rectangular welded manhole, rectangular thermal manhole. The company specializes in production and supply manhole, stainless steel manhole, can produce a variety of standard manhole according to customer requirements. Can supply carbon steel manhole standards: HG/T21515-2005, HG/T21516-2005, HG/T21517-2005, HG/T21518-2005, HG/T21519-2005, HG/T21520-2005, HG/T21521-2005 HG/T21522-2005, HG/T21523-2005, HG/T21524-2005, HG/T21525-2005, HG/T21526-2005, HG/T21527-2005,,, 2005 standard replaces the 1995 standard. Manhole in the tank the lower part of the manhole under a lot of fluid pressure in order to prevent leakage, the quality of the installation of the manhole must be strict. On the processing of the flange and the cover sealed waterline in the construction, we need to protect, in order to avoid the use of oil leakage. Do mark each manhole removed, so as not loaded when the dislocation, affecting rigor. Install the nut on the manhole cover, to be paired diagonal evenly, to prevent the cover deformation or uneven force caused by oil leakage. 
 This solemn commitment, all products of this company, within one year of any quality problems, protection surrender change. Customer and I signed a contract for the sale, allowing you to buy the rest assured with peace of mind.