THE TANKER FROM WHICH AMMONIUM HYDROXIDE WAS TO BE EXTRACTED DID NOT LOOK RIGHT TO AN EE AND EE PLACED HIS HAND ON EXTRACTION VALVE ASSEMBLY IN THE AREA OF THE WING NUT ON THE CLAMP THAT HOLDS BONNET PORTION OF VALVE IN PLACE. AT THIS POINT CLAMP RELEASED SHOT OUT UNDER PRESSURE FOLLOWED BY A STREAM OF AMMONIUM HYDROXIDE. EFFORTS TO STOP THE FLOW FROM TANKER WAS UNSUCCESSFUL