Tank hatches

Description

Tank hatches and cleanout holes are operating equipment and are necessary for operation and maintenance of vertical or horizontal tanks and vessels.

The Saratov Reservoir Plant supplies equipment of its own production:

• gauging hatches LZ
• light hatches LS
• manhole hatches LL
• bottom cleanout boxes
• cleanout holes

The application and design of tank hatches

Their main function is to provide access to the tank or vessel for maintenance and repair. In terms of design, they have a round or oval shape. The inner edge should have a coating that does not form sparks of friction resulting from Sampling equipment and measuring devices moving.

Gauging hatches LZ are designed for mounting of equipment to determine the oil level or sampling. Hatches LZ are installed on the mount nozzle or the neck. To prevent unauthorized access, tamper-evident sealing may be performed. The Plant supplies two sizes of LZ hatches: LZ-80, LZ-150.

Gauging hatch LZ	Criteria	LZ–80	LZ–150
	Nominal diameter (neck diameter), mm	80	150
	Overall dimensions, mm:
	diameter, D	185	260
	width, L	226	285
	height, Н	185	240
	Connection size, mm:
	D1	150	225
	d	18	18
	n	4	8
	Weight, kg, max	2,3	5

Light hatches LS are installed on the inlet - distribution nozzle for the light access inside, ventilation during defects examination or cleanout, maintenance control or repair. The sealing of the tank hood is guaranteed by the tightening.

Light hatch LS	Criteria		LS-200	LS-300	LS-400	LS-500	LS-500П	LS-600	LSC-1000
	Nominal diameter DN, mm		200	300	400	500	500	600	1000
	Overall dimensions, mm, max	diameter D	350	455	535	640	640	760	1175
		height H	362	500	4462	562	600	562	603
	Reinforcing plate diameter, mm, max		440	650	860	1100	1100	1160	1500
	Weight, kg, max		32	55	69	104	110	140	200

Manhole hatches LL are mounted in the first ring of the vertical tank to provide maintenance control or repair. Installation of LL hatches on tanks with a pontoon or floating roof is carried out to provide access to the roof. The hatches are equipped with davit arms and have a tightening to seal the hood. Plant SARRZ supplies manholes LL in the following sizes depending on the tank capacity: LL-500, LL-600, LL-800, oval manhole LL 600x900.

Round manhole hatch LL	Oval manhole hatch LL

Bottom cleanout boxes are installed in the lower ring of vertical tanks and are used for bottom sediments removal. The cleanout boxes provide access to perating personnel to the inside to carry out maintenance and repair. Especially this type of hatches is essential for normal operation of vertical tanks for viscous oil storage. The Plant SARRZ supplies bottom cleanout boxes in three sizes: 600x600, 600х900, 900х1200. (full details you may find here)

Cleanout holes are used for bottom sludge removing of vertical tanks or sludge generated in the interstitial space of the tanks with a protective wall ("a glass in a glass"). These holes are mounted under the bottom or the shell of the tank. The exact layout depends on the type of bottom: in tanks with a bottom pitch from the central point the cleanout hole is installed next to the shell within 500 mm; in tanks with a bottom pitch to the central point it is mounted under the bottom in the center; in tanks with flat bottom it is buried in the catch pit under the shell. Depending on the operating conditions, we complete the tanks with a trough or round cleanout holes.

Round cleanout hole	Trough cleanout hole

Hatches and cleanout holes supplied by the Saratov Reservoir Plant provide:

• large amount of open/close operation cycles (time to failure)
• interface integrity and joint tightness
• high corrosion resistance of steel grades used
• trouble-free performance throughout service life of the equipment

The hatches and the holes are supplied optionally together with a vertical tank at the Customer's request. It is possible to order manufacture of manholes and hatches separately.