On Top of your pressure Tank
Circular Type HLSDAccess Tank Cover -
HLSD, Manhole Cover.

Application

Outward opening manhole cover type HLSD is used on top of pressurized tanks and containers where closeable means of access to the interior of the vessel is required. HLSD is approved by the German TÜV authority, the Danish A.T. and the Dutch Stoomwezen for pressures up to 1000 kPa (10 bar).

Working principle

HLSD is secured in the closed position by springloaded swingbolts, which, together with the seal in the cover, ensure complete tightness. The cover is attached to the frame by a rigid hinge, giving exact location of the cover in the closed position and designed to stop the cover at an angle of 300 beyond the vertical position when opening.

Standard design

HLSD has from 4 up to 18 swingbolts subject to the size, pressure and temperature. The seal between cover and frame is located in the cover.

Materials

Product wetted

 
steel parts: 1.4404 (AISI 316L), supplied with inspection certificate 3.1.B according to EN10204.
Other steel parts: 1.4301 (AISI 304).
Seal: EPDM (-10°C to 140°C).
Finish: Semi-bright.

Note! Weldings are not treated.

 

 

 

Sizes

Internal diameters of frame:
200 mm, 300 mm, 400 mm, 450 mm, 500 mm, 600 mm and
800 mm.

Technical Data

Working pressure: Up to 1000 kPa (10 bar), ø200.
Negative working pressure: Full vacuum.
Test pressure: Max. 1.3 x working pressure.
Temperature range: -10°C to + 250°C.

Options

  • - Spring to assist opening.
  • - Arrangement for securing cover in open and
    closed position.
  • - Bracket for indication unit.
  • - Handle in stainless steel.
  • - Guide for cover for vertical installation.
  • - Sight glass acc. to DIN 28120.
  • - Union sight glass based on DIN 11851.
  • - Safety grid.
  • - Special surface finish.
  • - Different frame heights (up to 800 mm).
  • - Seal of Q (silicone), NBR (nitrile).
  • - Seal of FPM or FEP covered Q.

Note!Extra screws required (see table 1.b. overleaf).

Ordering

Please state the following when ordering:

  • - Size.
  • - Max. pressure and corresponding temperature.
  • - Max. temperature and corresponding pressure.
  • - Optional extras.

Selection Table

Size (mm) A (mm) No. of Screws Working pressure (bar) SL
(mm)		 Weight (kg)
at working temperature ( °C )
50° 100° 150° 200° 250°
200 206 4 10 10 10 10 10 3 15
300 306 4 7 6 6 6 6 3 19
300 306 5 9 8 7 7 9 3 20
400 406 4 4 3 3 3 3 4 24
400 406 5 5 4 4 4 4 4 25
400 406 6 6 5 5 5 5 4 26
400 406 7 7 6 6 6 6 4 27
400 406 8 8 7 7 7 6 4 28
450 456 5 4 3 3 3 3 4 28
450 456 6 5 4 4 4 4 4 29
450 456 7 6 5 5 5 4 4 30
450 456 8 7 6 5 5 5 4 31
450 456 9 7 6 6 6 6 4 32
450 456 10 8 7 7 7 6 4/5 33
500 506 5 3 3 3 2 2 4 31
500 506 6 4 3 3 3 3 4 32
500 506 7 5 4 4 4 3 4 33
500 506 8 5 5 4 4 4 4 34
500 506 9 6 5 5 5 5 4 35
500 506 10 7 6 6 5 5 4 36
500 506 11 7 6 6 6 6 4/5 37
600 608 6 3 2 2 2 2 4 42
600 608 8 4 3 3 3 3 4 44
600 608 9 4 3 3 3 3 4 45
600 608 10 5 4 4 4 3 4 46
600 608 11 5 4 4 4 4 4 48
600 608 12 6 5 5 4.5 4.5 5/6 49
600 608 14 7 6 5 5 5 6 53
800 808 10 2 2 2 2 2 6 66
800 808 12 3 3 2 2 2 6 68
800 808 13 3 3 3 3 2 6 74
800 808 14 4 3 3 3 3 6 78
800 808 16 4 4 3.8 3.7 3.5 6 92

Selection table for seals of FPM or
FEP covered Q.

Size
(mm)		 Min.number of screws
 
200 4
300 5
400 6
450 7
500 8
600 9
800 12
Selection table.

Fig. 2. Dimensions.

Dimensions (mm)

Size 200 300 400 450 500 600 800
A 206 306 406 456 506 608 808
C1 185 235 285 310 335 385 485
C 350 450 550 600 650 750 950
E 325 325 325 325 325 325 325
F 135 135 135 135 135 135 135
G 200 200 200 200 200 200 200
H 260 275 290 300 305 315 320
t 3 3 3 3 3 4 4
SL     See Selection table.