Quantcast Hose Pulsation Experience with the Collapsible Rubber Hose

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Total Coliform Count
Time of Flush
8,000/100 ml
10 min.
6,400/100 ml
15 min., same hose
Test #2:
Chlorination contact 200/100 ml with 5 min. potable water, flush
hose #2, black water, 20/100 ml.
Salt water flush, 2 l/2-inch main at 90 psi, hose #3, gray water,
Test #3:
=
10 min. flush  to >10,000/100 ml total coliform count.
Salt water flush, 2 l/2-inch main at 90 psi, hose #4, black water,
Test #4:
10 min. flush 350/100 ml coliform count. Salt water background
400/100 ml total coliform count.
Salt water flush, 2 l/2-inch main at 90 psi, hose #5, gray water,
Test #5:
10 min. flush 4,000/100 ml total coliform count. Same hose with
chlorine contact potable water with 200/100 ml with 5 min. salt
=
water flush  > 10/100 ml total coliform count.
Salt water flush, 2 l/2-inch main at 90 psi, hose #6, gray water,
Test #6:
10 min. flush 30,000/100 ml total coliform count. Same hose 10
min. standard stock detergent contact 2,000/100 ml total coliform
count.
Test #7:
Salt water flush, 2 l/2-inch main at 90 psi, hose #7, gray-black
water, 10 min. flush 2,200/100 ml total coliform count.
Chlorine contact potable water with 200/100 ml, 10 min., hose #8,
Test #8:
gray-black water, 500/100 ml total coliform count. Chlorine
residual in drain water 75 ml.
B.13 HOSE PULSATION EXPERIENCE WITH THE COLLAPSIBLE RUBBER HOSE
MIL-H-20176B.  It was noted that at times severe pulsation action took place
in the hoses hooked up regularly to the two AS tenders at the Navy submarine
support facility.  The rubber hose on the AS-37 was replaced with a plastic
hose and the pulsation problem was overcome.  On the AS-12 the pier riser
valve was closed 30 percent, which produced a 5 psi reading at the pier
riser. This resulted in a full hose flow approximately two-thirds the
height of the hose up to the ship riser.  The pulsations were reduced to a
small quiver.
a. The pulsations are undesirable because they occur on the pier near
the pier riser, causing abrasion at points where the hose is in contact with
the pier curb and/or fender system.
b.  The flow meters on each ship indicated the average flow: AS-12,
250-700 gal/rein;  As-37, 250-300 gal/rein during pumping cycles.
c.  To further study the pulsation, problem tests were conducted on a
gravity pier sewer (Pier 4) and a pressure manifold pier sewer (Pier 5) at
the Naval Station, San Diego, and from a salt water line 40 feet above Pier
5 aboard the AD-15.  The test results are as follows:
B-3





 


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