Multiquip ST-45HRM manual Nience

ST-45 PUMP — OPERATING PROCEDURES

Use a 25 ft.hose, or short section, off the pump;and for the balance of the horizontal distance to the vertical line, use steel pipe.This type of installation has been satisfactory on many jobs being pumped in excess of 100 feet high. Line pressures are always less using steel pipe as compared to hose.

Whenpumpingvertically,usingallhose,itisrecommended not to go higher than 50 feet with hose.The hose should be tied off at intervals of 10 feet, if possible. Special attention shouldbegivenwhentieingthehoseoffatthetopasthehose willhaveatendencytostretchwhenfilledwithconcrete.This will increase the possibility of a blockage at the point where the hose is tied off.To avoid this, a long radius of 90 degree elbow is recommended.The suggested place to tie off is on the hose, under the clamp.

NOTE	It is strongly recommended that
	steel pipe be used on all vertical
	pumping for safety and conve-
	nience.

20.Pulsation – A slight pulsation of the hose will always be noticeable near the pump.Excessive pulsation of the hose near the pump is normally due to higher than average line pressures caused by stiff, harsh mixes, or extremely long pumpingdistances.

The use of 2 -1/2”I.D.hose in these extreme cases reduces linepressuresortheadditionofslightamountsofwatertothe mix, if permissible, will permit easier pumping.The use of certain pumping admixtures may help.

Ifexcessivepulsationexistsinthehose,itisadvisabletouse burlap or some means of wear protection under the hose at pointswherethehosemaywearthroughtheoutercover;e.g. over forms, steel or sharp curbs.

21.Snap-Joint – When using Snap-Joint couplings with gas- kets to join hose, see that they are washed clean after each job.Keeping the hose ends clean (heavy duty) is very impor- tant for the best job setup.A thin coat of grease on the rubber gasket or dipping both coupling and gasket in water before coupling the hose will make for easier installation.

22.NewPumps– All new pumps are‘water pressure tested”at the factoryThis procedure permits a thorough inspection of

entire drive system and valving under simulated full load conditions.The pump owner can do the same by making an adapter to couple to the end of the discharge cone: e.g., the use of a standard 2" pipe cap with a 3/8" drilled hole in the center, screwed on to the end of hinged cone or reducer at thepump.

Fillhopperwithwateraftermakingsurethatallsandandrock have been removed from manifold. Operate pump at full throttle and the 3/8" diameter hole restriction will create sufficient back pressure to make thorough inspection of all moving parts.

PAGE 28 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)