A403 WP304 Boiler Manhole Device Container Tank Maintenance

Manhole refers to the opening structure used for personnel to enter and exit equipment for installation, maintenance and safety inspection. It is mainly composed of short tube section (or short tube), flange and manhole cover with handle. For safety inspection considerations, the number of manholes required to be opened for pressure vessels and their minimum dimensions are shown in "Inspection Holes". The manhole materials are carbon steel and stainless steel. Manholes are divided into normal pressure and pressure manholes according to pressure conditions; manholes are divided into round, oval and rectangular manholes according to their shape. Rectangular manholes are only suitable for atmospheric equipment; manholes are divided into horizontal according to the installation position Manholes are installed vertically; the fixing methods of manhole covers include rotating cover and hanging cover; the speed after opening of the manhole has ordinary and quick opening. The structure and size of manholes are generally standardized. Please refer to the relevant manual for selection or design.

Manholes have been shaped products, usually 600mm in diameter.

The center of the manhole is generally 750mm from the floor. It is convenient for staff to enter and exit the oil tank or ventilate during installation, cleaning and maintenance.
The manhole of the non-metal oil tank is set on the top of the tank, and the manhole of the metal oil tank is set on the bottom plate of the tank wall. Most of them are round holes with a diameter of 600mm, with a center distance of 750mm from the bottom plate. They are used for tank cleaning or maintenance personnel to enter and exit the tank. They are also called gates. Use manholes for lighting and ventilation at all times during maintenance and cleaning of oil tanks. Vertical oil tanks have 1 to 2 manholes when the capacity is below 5000m3, and 2 manholes for those above 5000m3. The installation of the manhole should be no more than 90° away from the oil inlet and outlet pipelines. When only one manhole is provided, it should be placed on the opposite side of the light-transmitting hole on the top of the tank; when two manholes are provided, one of them is located on the opposite side of the light-transmitting hole, and the other should be separated from the first manhole by at least 90 °.

One manhole should be located near the right side of the oil inlet and outlet pipes, and try to make the manhole face the closed door of the tank chamber so as to facilitate the entry and exit of the oil tank and the ventilation pipe.
Since the manhole is installed on the bottom ring of the oil tank, leakage prevention is particularly important. It is required that the joint surfaces of the two flanges must be flat and free of twisting. The reinforcement plate and flange should be cut on the whole steel plate as far as possible without splicing. The flange and cover plate are processed with sealing rings, so special attention should be paid to protection during construction. 3mm thick asbestos rubber gasket is used for sealing, no cracks are allowed. When installing the manhole cover to tighten the bolts, force evenly

at diagonal angles to prevent the cover from deforming.

1. Name:Stainless steel manhole

2. Size: Custom

3. Product function : Complex structure carbon steel, stainless steel

4. Certification: ISO9001, SGS, CTI, ROHS

      Hebei Zexu Pipeline Manufacturing Co., Ltd. has a complete production and operation management system and is one of the first companies in the industry to pass the ISO9001 quality management system certification, HSE environment, and occupational health and safety management system certification. The company has three manufacturing branches for steel pipes, pipe fittings, and boiler vessels, and has functional departments such as marketing department, technology department, purchasing department, production department, inspection department, quality assurance department, and comprehensive department. It has established a complete and complete set of quality, Safety, production and management procedures.
      After years of development, Hebei Zexu Pipeline Manufacturing Co., Ltd. has a nationwide business network and radiates to the United States, India, Pakistan, Russia, the Middle East and other countries and regions.
      Hebei Zexu Pipe Manufacturing Co., Ltd. has always adhered to the business philosophy of honesty, innovation and cooperation to promote development, customer satisfaction and trust as the foundation, sustainable development as the goal, relying on scientific management to improve quality, reduce costs, and create brands. For many consecutive years, it has been awarded as "Advanced Unit for Safety Production Standardization Construction", "Hebei Province Industrial Cluster Leading Enterprise", "AAA Credit Enterprise", "Hebei Province Metal Products Industry Leading Enterprise", "Hebei Province Key Employment Service Enterprise", "Star Enterprise", "Top 50 Industrial Enterprises in Cangzhou City", "Famous Trademark of Hebei Province", "Contract-abiding and Promise-keeping Unit", "Recommended Supplier of Main Auxiliary Equipment for Thermal Power Units" and other honorary titles.