2648

Description：
The Type 2648 is a high-performance, low-emission cartridge mechanical seal designed to provide additional safety for hazardous applications and applications where controlled sealing environment is
 needed. Its inboard seal design uses the same low-emission/leakage technology as the Type 1648. The outboard seal provides additional containment in conjunction with an API Flush Plan 52.

Suggested Operating Limits:
Temperature: -40°F to 500°F/-40°C to 260°C
Pressure: 1000 psi(g)/69 bar(g)
Speed: 5000fpm/25m/s

Features:
API 682-qualified
Dual Unpressurized Cartridge seal
O-ring Pusher Seal
In agreement with API 682 technical design requirements
Standard materials, per API 682
Suits API 682 Table 1 and 2 seal chambers
Having computer-optimized, low-emission/leakage seal face designs

Recommended Applications：
Process pumps
Other rotating equipment

Background Knowledge：
Sealed chamber pressure value Pm for reference：

Pump Type	Estimation formula
Rear cover plate with back vanes and wear ring	Pm=Ps+0.25(Pd-Ps)
Rear cover plate with balance hole	Pm=Ps+0.10(Pd-Ps)
Withbackvanes and balance hole	Pm=Ps
Rear cover plate with wear ring and no balance hole	Pm=Ps+1.8bar
Open impellor，no rear cover plate，no balance hole	Pm=Ps+C(Pd-Ps)，C=0.1(maximum impellor diameter), C=0.3(minimum impellor diameter)
Rear cover plate with no wear ring and no balance hole	Pm=Ps（true for most vertical pumps）
Double entry pump	Pm=Ps
Multistage pump	According to analysis of arrangement of balance pipe, balance disc and balance drum, pressure in sealed chamber is equal to sometimes the inlet pressure, sometimes pressure of the outlet of a certain intermediate stage, and sometimes outlet pressure of pump.
Remarks：Ps is inlet pressure of pump, and Pd is outlet pressure of pump.