Mtex Dual seals

Mtex Dual seals
Item Description
1 Bellows unit
2 O-Ring
3 Set screw
4 Seat
5 O-Ring
6 Shaft sleeve
7 O-Ring
8 Cover
9 Seal face
10 O-Ring
11 Spring
12 Seat
13 O-Ring
14 Drive collar
15 O-Ring
16 Set screw
17 Retaining ring
18 Assembly fixture
19 Hex socket head screw
20, 22 Gasket
23 Screw plug

Mtex Dual seals

Features

  • Double seal
  • Mtex-DN: API Plan 52 (53/54)
  • Mtex9-DN: API Plan 53/54
  • Cartridge
  • Balanced
  • Independent of direction of rotation
  • Metal bellows
  • Stationary Springs
  • Pumping device independent of direction of rotation

Advantages

  • Ideal seal for standardizations
  • Universal applicable for packings conversions, retrofits or OEM
  • No dimensional modification of the seal chamber (centrifugal pumps) necessary, small radial installation height
  • Trouble-free running due to bellows unit with vibration dampers (essential in case of dry-running)
  • No damage of the shaft by dynamically loaded O-Ring
  • Self cleaning effect of the bellows
  • Straightforward and easy installation due to pre-assembled unit

Operating range

Shaft diameter:
d1 = 25 ... 80 mm (1" … 3.15")
Temperature:
t* = –40 °C ... +220 °C (–40 °F ... + 428 °F)
Pressure: p1 = 25 bar (232 PSI)
Sliding velocity: vg = 20 m/s (66 ft/s)

Barrier fluid circulation system:
p3max = 16 bar (232 PSI)
Δp (p3–p1) ideal = 2 … 3 bar (29 … 44 PSI)
Δp (p3–p1) max.
= 10 bar (145 PSI) at <120 °C (<248 °F)
= 5 bar (73 PSI) at ≤ 220 °C (≤232 °F)

API Plan 52 (53/54)

Pump startup:
Δp (p3–p1) max.16 bar (232 PSI) allowed

* Operating limits of O-Rings to be observed

Materials

Seal face:
Carbon graphite (A), Silicon carbide (Q1)
Seat:
Silicon carbide (Q1), Tungsten carbide (U2)
Secondary seals:
FPM (V), EPDM (E), FFKM (K)
Bellows: Inconel® 718 (M6)
Springs: Hastelloy® C-4 (M)
Metal parts: CrNiMo steel (G), Duplex (G1)

Recommended piping plans

EagleBurgmann TS 2000 Thermosiphon system

Product link:
EagleBurgmann TS2000

Detailed information
on these API 682 4th edition plans:
API Plan 52
API Plan 53A
API Plan 53B
API Plan 53C
API Plan 54



Product variants

Mtex9-DN
Dimensions, items and descriptions as for Mtex-DN, but with optimized seal face geometry for pressurized operation according to API Plan 53/54. A barrier fluid system (e.g. EagleBurgmann TS2000) is necessary.

Pressure: p1 = 10 bar (145 PSI)
Sliding velocity: vg = 20 m/s (66 ft/s)

Barrier fluid circulation system:
p3max = 16 bar (232 PSI)
Δp (p3 – p1) ideal = 2 … 3 bar (29 … 44 PSI)
Δp (p3 – p1) max = 16 bar (232 PSI)

API Plan 53/54

Pump startup:
Δp (p3 – p1) max = 16 bar (232 PSI) allowed