Range of product:
"SEHRA" Pumps cover a range of capacities extending to 700 M.cu/hr. at 1450 rpm, and 300M.cu/hr_ at 2900 rpm. Head range upto 145 mtrs. Design pressures to 25 bars, and process temperatures extend from -40°C to +300°C, depending on the material of construction.
Materials:
All parts that come into contact with the liquid are made from Cast iron, Ductile iron, Rubber Lined, Cast steel, Bronze, Ni-Resist, Ni-Cast iron, Stainless steel, Alloy-20, R.52, R.53, R.55, Hastally-C, Hastally-B and other Alloy grades as per operating conditions.
Design Features:
"SEHRA" centrifugal process pumps are of single stage, horizontal end suction type, with semi open impellers. The semi open impellers are used / supplied where liquids, containing solids, or have a tendency to polymerize or crystallize. A special feature is easy of maintenance due to the foot mounted volute casing, permitting removal of the rotating assembly without disturbance of pipe connections. An extensive choice of materials of construction is offered enabling a wide range of chemicals to be handled. The casing assembly is hydrostatically tested to a minimum of 1.5 times the shut-off pressure.
Additional non-destructive testing procedures are carried out as standard practice on all pump parts.
Impellers :
Impellers are of the Semi open Design. They are statically and hydraulically balanced. Semi open Impellers have integral cast back vanes to provide hydraulic balance and relieve stuffing box pressure. They are located on the shaft by a incorporating a screw threads and sealed against the shaft by PTFE 0" rings.
Sealing:
SEHRA centrifugal process pumps are supplied. with gland packing or mechanical seal in the stuffing box with connection for sealing and flushing liquid. Design incorporates a lantern ring and gland which enables easy changing of the gland packing without dismantling the pump. The stuffing box is designed so that mechanical seals can be fitted with little or no alteration.
Steam Jacketed Pumps Available:
"SEHRA" centrifugal process pumps can be supplied with stem jacketed casing for handling liquids which solidify at ambient or above ambient temperatures. The jacketed casing is used with the jacketed stuffing box to provide a completely heated liquid end. This construction easily handles high melting liquids such as sulphur, naphthalene, tars, waxes, etc.
